催化学报 ›› 2022, Vol. 43 ›› Issue (7): 1719-1748.DOI: 10.1016/S1872-2067(21)63994-3
熊胜, 汤榕菂, 龚道新, 邓垚成(), 郑蒋夫, 李玲, 周展鹏, 杨丽华, 苏龙
收稿日期:
2021-10-08
接受日期:
2021-12-06
出版日期:
2022-07-18
发布日期:
2022-05-20
通讯作者:
邓垚成
基金资助:
Sheng Xiong, Rongdi Tang, Daoxin Gong, Yaocheng Deng(), Jiangfu Zheng, Ling Li, Zhanpeng Zhou, Lihua Yang, Long Su
Received:
2021-10-08
Accepted:
2021-12-06
Online:
2022-07-18
Published:
2022-05-20
Contact:
Yaocheng Deng
Supported by:
摘要:
化石能源的发现和应用是工业文明快速发展的基础. 然而, 化石燃料的过渡开发和消耗导致能源短缺和环境污染问题日益突出. 因此, 迫切需要采用清洁能源替代化石能源. 其中, 氢气(H2)因具有热值高、无污染等优点而被认为是最有前途的清洁能源之一. 目前, 应用较多且比较成熟的制氢技术有电催化法、部分氧化法、自热重整法、甲醇重整法、蒸汽重整法和生物法. 但是, 这些技术的能耗和成本都比较高. 光催化制氢技术可实现太阳能的转化和利用, 被认为是解决能源短缺和环境污染问题的有效方法之一, 受到广泛关注. 光催化制氢主要采用贵金属催化剂, 但贵金属稀缺且成本高, 严重限制了其大规模应用. 因此, 迫切需要寻找一种便宜、高效和稳定的光催化制氢催化剂. 碳纳米结构材料(CNMs)具有优异的结构和半导体性能, 包括良好的导电性、较大的比表面积、较好的热稳定性和化学稳定性, 可以有效地参与光催化制氢. 此外, CNMs和光催化剂的结合可以增强反应物的吸附位点和活性中心, 加速电荷分离和传输, 抑制光激发的电子-空穴对的复合. 同时, CNMs可以减少催化剂颗粒的聚集, 改善催化剂颗粒的分布. CNMs还具有光敏性或光热效应, 可以大大提高光催化制氢的效率. 特别是CNMs价格低, 可大幅度降低用于光催化分解制氢催化剂的成本, 使实现工业化应用成为可能, 因而, 大量CNMs用于光催化水分解制氢领域.
本文综述了碳点、富勒烯、纳米管、石墨烯和石墨炔等碳纳米材料在光催化制氢领域的广泛应用, 总结了其在光催化制氢过程中作为光催化剂、助催化剂和光敏剂的应用. 介绍了近年研究人员在光催化制氢中所采取的增强CNMs活性的策略. 最后, 展望了CNMs在光催化制氢方面所面临的挑战和机遇.
熊胜, 汤榕菂, 龚道新, 邓垚成, 郑蒋夫, 李玲, 周展鹏, 杨丽华, 苏龙. 环保型碳纳米材料在光催化制氢方面的应用[J]. 催化学报, 2022, 43(7): 1719-1748.
Sheng Xiong, Rongdi Tang, Daoxin Gong, Yaocheng Deng, Jiangfu Zheng, Ling Li, Zhanpeng Zhou, Lihua Yang, Long Su. Environmentally-friendly carbon nanomaterials for photocatalytic hydrogen production[J]. Chinese Journal of Catalysis, 2022, 43(7): 1719-1748.
Fig. 2. Recent works of CNMs in photocatalytic H2 production. (a) Quantity of related literature in the recent decade. (b) Origin country and quantity of related literature. (c) Categories and proportion of related literature. (Data from Web of Science, index keywords are “carbon”, “photocatalytic” and “hydrogen”).
Fig. 5. (a) DFT-optimized cell structures of ideal graphene (i), graphene with hexavacancy (ii), and corresponding quaternary (iii), pyridinic (iv), and pyrrolic (v) N-doped graphenes. (b) Calculated spin-polarized band structure and N 2p PDOSs of quaternary N-doped graphene. Reprinted with permission from Ref. [123]. Copyright 2015, ACS. (c) Schematic of the X-doped graphene nanoribbons, showing the possible positions of dopants. Reprinted with permission from Ref. [124]. Copyright 2015, Wiley.
Fig. 7. Scheme of the CNMs as the supporting material under typical situations, (a) CNMs as electron acceptor, (b) CNMs as electron donor; (c) CNMs as electron acceptor and donor.
Fig. 8. (a) Schematic diagram of photocatalyst preparation process. (b) Schematic illustration of the photocatalytic hydrogen evolution mechanism in ex-TA@C catalysts. (c) HRTEM images pattern of ex-TA@C hybrids. (d) Energy band schematic illustration for TA@C and ex-TA@C hybrids. (e) UV-vis diffuse reflectance absorption spectra of TA NPs, TA@C and ex-TA@C catalysts. Reprinted with permission from Ref. [146]. Copyright 2020, Elsevier.
Fig. 9. (a) The Fourier transform of EXAFS spectra derived from EXAFS. (b) FT-EXAFS curves between the experimental data and fit. (c) The schematic multi-scale design of Pt-NCDs/TiO2 photocatalyst. Reprinted with permission from Ref. [147]. Copyright 2020, RSC.
Fig. 10. (a) Low magnification TEM images of CdS/CNF mats. (b) Time profiled photocurrent generations on CdS-loaded CNF mats under visible light. (c) Diffused reflectance UV-visible spectra of CdS-loaded CNF mats. (d) Schematic diagram for visible-light-induced H2 production of CdS loaded CNF system. Reprinted with permission from Ref. [155]. Copyright 2015, Elsevier.
Fig. 11. (a) Experimental (symbols) and fitted (solid lines) Nyquist plots of CSCPE and GPE. (b) Transient photocurrent response of bare CdS QDs and CdS/CSC. (c) A photocatalytic mechanism proposed for visible-light-driven H2 production on Pt/CdS/CSC from water containing lactic acid as hole scavenger. LA, CB and VB label the lactic acid, conduction band and valence band, respectively. Reprinted with permission from Ref. [156]. Copyright 2016, Elsevier.
Fig. 12. (a) Preparation of CdS/GDY composite and its photocatalytic process. (b) TEM image of GDY2.5. (c) Band structures of GDY and CdS. Reprinted with permission from Ref. [121]. Copyright 2019 ACS.
Fig. 13. (a) TEM image of Co-NG/g-C3N4, scale bar 500 nm. (b) LSV curves of a cathodic scan from 0 to -2.3 V (vs. Ag/AgCl) in TEOA solution. (c) Photoluminescence spectrums of an anodic scan from 0 to 1.8 V (vs. Ag/AgCl) in TEOA solution for Co-NG/g-C3N4 and g-C3N4 samples. (d) Photo-current measurement of catalysts in 0.5 mol/L Na2SO4 solution under 0.5V (vs. Ag/AgCl). Reprinted with permission from Ref. [166]. Copyright 2018, Elsevier.
Fig. 14. (a) A comparison of jH2 of CNT and CNT/Ag NWs at various potentials. (b) Raman spectra of AB, CB, GF, and CNT. (a,b) Reprinted with permission from Ref. [167]. Copyright 2019, Elsevier. (c) TEM Micrographs of Cu1/TiO2-60. (d) Schematic diagram of the g-C layer encapsulating Cu0 nanoparticles to enhance the performance of materials. Reprinted with permission from Ref. [168]. Copyright 2020, ACS.
Fig. 15. (a) Illustration of the PEC water oxidation at the NFCB photoanode. (b) Schematic diagram illustrating the separation of photo-generated electrons and holes in the water splitting system. (a,b) Reprinted with permission from Ref. [170]. Copyright 2017 RSC. (c) Schematic representation of excited-state processes for doped C-dots excited at core state (at 320 nm) and surface state (at 420 nm). Reprinted with permission from Ref. [171]. Copyright 2019, ACS.
Fig. 16. (a) UV/Vis diffuse reflectance spectra of BCN, P-TCN, and a series of P-TCN/GQDs photocatalysts with different ratios of GQDs. (b) Transient photoelectrochemical responses for BCN, P-TCN, and P-TCN/GQDs-0.15 under visible-light irradiation. (c) Possible photocatalytic mechanism for hydrogen evolution over P-TCN/GQDs-0.15 under visible light irradiation. Reprinted with permission from Ref. [172]. Copyright 2018, Wiley.
Species | Photocatalyst | Pattern of CNMs | Light source | Reaction medium | Efficiency (mmol·h-1·g-1) | Ref. | ||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Fullerene | C60-Cr2-xFexO3 | Photosensitizer | 300 W Xe lamp with an UV cut-off filter (λ > 420 nm) | 5 mg sample in 78 mL TEOA solution (10 vol%) | 0.2205 | [ | ||||||
C60/Fe2O3 | Photosensitizer | 300 W Xe lamp with an UV cut-off filter (λ > 420 nm) | 5 mg sample in 78 mL TEOA solution (10 vol%) | 0.3218 | [ | |||||||
C60/CdS | Photosensitizer | 300 W xenon lamp with a 420 nm cutoff filter | 25 mg photocatalyst in 50 mL aqueous solution containing 10 vol% lactic acid and 1 wt% Pt | 1.73 | [ | |||||||
C60/TiO2 | Photosensitizer | 300 W Xe lamp without filters | 30 mg sample in 80 mL TEOA solution (10 vol%) | 0.5792 | [ | |||||||
C60/MoS2 | Photosensitizer | 300 W Xe-lamp | 1 mg sample in 20 mL aqueous solution containing 3.5 mg Eosin Y (EY) and 1 mL TEOA | 6.89 | [ | |||||||
C60/graphene/g-C3N4 | Photosensitizer | 5 W LED irradiation (λ > 420 nm) | 100 mg sample in 50 mL aqueous solution containing 1 wt‰ Pt and 10 vol% TEOA | 0.0946 | [ | |||||||
Carbon dots | TiO2/CQD/Pt | Photosensitizer | 300 W Xe lamp equipped with cutoff filter (λ ≥ 420 nm) | 10 mg photocatalysts and 20 mL TEOA solution (0.33 mol/L) | 1.458 | [ | ||||||
CDs/ BiVO4QDs | Photosensitizer | 300 W Xe lamp | 80 mg sample in 100 mL ultrapure water without any sacrificial reagents | 0.0115 | [ | |||||||
CDs/CdS | Photosensitizer | 300 W Xe lamp with 420 nm UV cutoff filter | 50 mg sample in 20 mL ultrapure water without any sacrificial reagents | 0.051 | [ | |||||||
CuCQDs | Photocatalyst | 300 W Xe lamp with 420 nm UV cutoff filter | 2 mL 0.01 g·L-1 CQDs in 1 mL 2 mmol·L-1 copper acetate solution, 10 mL of lactic acid, 56 mL DI water and 1 g PEG | 64 | [ | |||||||
Co@C | Supporting | 300 W Xe lamp with 420 nm UV-cut-off filter | 20 mg catalyst dispersed in 100 mL triethanolamine (10 vol%) | 0.286 | [ | |||||||
CdS/Co@NC | Co-catalyst | 420 nm LED lamp with the intensity of 100 mW cm-2 | 2 mg sample and 10 mL 10 vol% lactic acid solution | 21.8 | [ | |||||||
NCDs | Photocatalyst | 450 W Xe lamp | 5 mg CDs in 3 mL methanol (6 vol%) | 0.0187 | [ | |||||||
NCDs/TiO2 | Photosensitizer | 500 W metal halide lamp | 50 mg sample in 25 mL methanol (25 vol%) | 0.196 | [ | |||||||
Carbon nanotubes | Ni-TiO2/CNT | Supporting | Liquid phase plasma | 500 mg sample and 200 mL 10 vol% ethanol solution | 10 | [ | ||||||
WO3-CNT@ MoSe2 | Supporting | Visible-light irradiation using cutoff filter (λ ≥ 400 nm) | 25 mg photocatalyst in 100 mL solution containing 0.1 mol/L Na2S and 0.04 mol/L Na2SO3 | 0.163 | [ | |||||||
CNT-TiO2 | Supporting | Visible light (20 W Sisca white LED) | 5 mg sample in 20 mL DI water | 0.0694 | [ | |||||||
Species | Photocatalyst | Pattern of CNMs | Light source | Reaction medium | Efficiency (mmol·h-1·g-1) | Ref. | ||||||
Cu/CNT-TiO2 | Supporting | Sunlight on sunny days between 10 a.m. and 3 p.m. | 5 mg photocatalyst in 50 mL glycerol aqueous solution (5 vol%) | 54.4 | [ | |||||||
Ni/γ-Al2O3/ CNT-TiO2 | Supporting | Solar light irradiation | 10 mg materials in 50 mL glycerol solution (5 vol%) | 3.4 | [ | |||||||
1%CNT-Pt/TiO2 | Supporting | UV-LED system (384 nm) | 0.5 g·L-1 catalyst | 1.046 | [ | |||||||
Fe@CNTs/ Pd@TiO2 | Supporting | UV 125 W medium pressure Hg lamp | 10 mg materials in 60 mL ethanol solution | 1.638 | [ | |||||||
CN/SWCNT | Supporting | 150 W Xe lamp | 60 mg samples with 1.5 wt% Pt in 80 mL TEOA solution (10 vol%) | ~50 | [ | |||||||
TiO2-Ni(OH)2/ CNT/CdS | Supporting | 300 W Xenon arc light source after filtering the UV light | 50 mg photocatalyst in 20 mL lactic acid and 210 mL water | 12 | [ | |||||||
TiO2-x/CNT | Supporting | 300 W Xeon-lamp with a 420 nm cut-off filter | 50 mg photocatalysts in 80 mL methanol (25 vol%) | 0.2429 | [ | |||||||
AuNPs@NiS @CNT | Supporting | 300 W Arc-Xe lamp | 20 mg photocatalysts in 100 mL TEA solution (15 vol%) | 18.3 | [ | |||||||
Cu3P-CNT | Supporting and co-catalyst | 350 W Xe lamp | 50 mg sample in 80 mL TEOA solution (15 vol%) | 17.22 | [ | |||||||
CNT-GR-TiO2 | Supporting | Oriel Xe-350 W lamp | 5 mg photocatalyst in 50 mL methanol (10 vol%) | 29 | [ | |||||||
Graphene | Ce-Sulfonated GO | Supporting | UV or visible light lamp | 100 mg photocatalyst in 100 mL NaCl solution (17.5 vol%) and 2.0 g Na2S and 5.0 g Na2SO3 | 2.1 (UV light) 0.7 (visible light) | [ | ||||||
NiTiO3/rGO | Supporting and co-catalyst | 100 W linear halogen lamp | 10 mg photocatalyst in 50 mL methanol (5 vol%) | 8.383 | [ | |||||||
SrTiO3/PAN/ x-graphene | Supporting and co-catalyst | 120 W ultraviolet lamp (λ = 254 nm) | 1000 mg catalyst in 20 ml methanol solution (15 vol%) | 0.34 | [ | |||||||
ZnO/rGO/C | Supporting | 300 W Xe lamp | 50 mg sample in 120 mL methanol (25 vol%) | 0.0146 | [ | |||||||
MoS2-graphene/ ZnInS2 | Supporting | 300 W Xenon lamp with cut-off filter (λ > 420 nm) | 50 mg sample in 50 mL aqueous solution containing 0.25 mol/L Na2S and Na2SO3 | 4.167 | [ | |||||||
CdS/MoS2/ graphene | Supporting | 300 W Xenon lamp with a 400 nm cut-off filter | 30 mg catalyst in 50 mL lactic acid solution (10 vol%) | 1.913 | [ | |||||||
Nb6/PPy-RGO | Supporting | 300 W Xe lamp | 50 mg catalyst in 40 mL CH3OH solution (25 vol%) | 0.2076 | [ | |||||||
MoS3/Au@AgNP/rGO | Supporting | 300 W Xe lamp | 10 mg catalysts, 26 mg EY, and 100 mL TEOA solution (15 vol%) | 10.6 | [ | |||||||
graphene-TETA/ CuO | Supporting | 300 W Xenon lamp equipped with an optical filter (λ > 420 nm) | 0.4 g·L-1 catalyst with 12.5 mg Eosin Y, 9 mL TEA and 26 mL water | 5.85 | [ | |||||||
ZnO-ZnS/ graphene | Supporting | 300W high-pressure mercury lamp | 50 mg catalyst in 100 mL glycerol solution (40 vol%) | 1.07 | [ | |||||||
Ag-Bi2WO6- graphene | Supporting | 300 W high-pressure mercury lamp | 50 mg photocatalyst in 100 mL NaCl solution (3 mol/L) and 0.1 mol/L Na2S and 0.04 mol/L Na2SO3 | ~0.25 | [ | |||||||
CuO/rGO | Supporting | 300 W Xenon light | 40 mg catalyst with 1 wt% Pt in 80 mL methanol solution | 19.2 | [ | |||||||
WO3/TiO2/rGO | Supporting | 350 W Xe arc lamp | 50 mg catalyst in 80 mL methanol solution (20 vol%) | ~0.25 | [ | |||||||
CdS/WS2/ graphene | Supporting | 500 W Xeno arc lamp through a UV-cutoff filter (λ > 420 nm) | 8 mg photocatalyst in 8 mL aqueous solution containing 0.35 M mol/L Na2S and 0.25 mol/L Na2SO3 | 1.842 | [ | |||||||
Graphdiyne | GDY-CuI | Photocatalyst | 5 W light emitting diode lamp | 10 mg catalyst in 30 mL TEOA solution (15 vol%) | 9.319 | [ | ||||||
NiTiO3-CuI/GD | Supporting and photocatalyst | 5 W simulated sunlight | 10 mg catalyst in 30 mL TEOA solution (15 vol%) | 0.509 | [ | |||||||
TiO2/γ-GY | Supporting | 300 W Xe arc lamp | 20 mg catalyst in 100 mL methanol solution (10 vol%) | 0.97 | [ | |||||||
TiO2/MoSe2/ γ-graphyne | Supporting | 300 W Xe arc lamp with an optical filter | 20 mg catalyst in 100 mL methanol solution (10 vol%) | 0.8 | [ | |||||||
Mn0.2Cd0.8S/ Graphdiyne | Supporting and photocatalyst | 300 W Xenon lamp with 420 nm filter | — | 9.904 | [ | |||||||
H-GDY/TiO2 | Supporting and photocatalyst | Oriel 300 W Xenon lamp | 10 mg catalyst in 20 mL methanol solution (25 vol%) | 6.2 (UV light) 0.67 (visible light) | [ | |||||||
GDY/g-C3N4 | Supporting and photocatalyst | Xe lamp (350 W) was used as the light source, and a filter (λ > 420 nm) | 50 mg catalysts in 80 mL of TEOA solution (15 vol%) | 0.792 | [ |
Table 1 CNMs-based photocatalysts for photocatalytic H2 production (2016-2021).
Species | Photocatalyst | Pattern of CNMs | Light source | Reaction medium | Efficiency (mmol·h-1·g-1) | Ref. | ||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Fullerene | C60-Cr2-xFexO3 | Photosensitizer | 300 W Xe lamp with an UV cut-off filter (λ > 420 nm) | 5 mg sample in 78 mL TEOA solution (10 vol%) | 0.2205 | [ | ||||||
C60/Fe2O3 | Photosensitizer | 300 W Xe lamp with an UV cut-off filter (λ > 420 nm) | 5 mg sample in 78 mL TEOA solution (10 vol%) | 0.3218 | [ | |||||||
C60/CdS | Photosensitizer | 300 W xenon lamp with a 420 nm cutoff filter | 25 mg photocatalyst in 50 mL aqueous solution containing 10 vol% lactic acid and 1 wt% Pt | 1.73 | [ | |||||||
C60/TiO2 | Photosensitizer | 300 W Xe lamp without filters | 30 mg sample in 80 mL TEOA solution (10 vol%) | 0.5792 | [ | |||||||
C60/MoS2 | Photosensitizer | 300 W Xe-lamp | 1 mg sample in 20 mL aqueous solution containing 3.5 mg Eosin Y (EY) and 1 mL TEOA | 6.89 | [ | |||||||
C60/graphene/g-C3N4 | Photosensitizer | 5 W LED irradiation (λ > 420 nm) | 100 mg sample in 50 mL aqueous solution containing 1 wt‰ Pt and 10 vol% TEOA | 0.0946 | [ | |||||||
Carbon dots | TiO2/CQD/Pt | Photosensitizer | 300 W Xe lamp equipped with cutoff filter (λ ≥ 420 nm) | 10 mg photocatalysts and 20 mL TEOA solution (0.33 mol/L) | 1.458 | [ | ||||||
CDs/ BiVO4QDs | Photosensitizer | 300 W Xe lamp | 80 mg sample in 100 mL ultrapure water without any sacrificial reagents | 0.0115 | [ | |||||||
CDs/CdS | Photosensitizer | 300 W Xe lamp with 420 nm UV cutoff filter | 50 mg sample in 20 mL ultrapure water without any sacrificial reagents | 0.051 | [ | |||||||
CuCQDs | Photocatalyst | 300 W Xe lamp with 420 nm UV cutoff filter | 2 mL 0.01 g·L-1 CQDs in 1 mL 2 mmol·L-1 copper acetate solution, 10 mL of lactic acid, 56 mL DI water and 1 g PEG | 64 | [ | |||||||
Co@C | Supporting | 300 W Xe lamp with 420 nm UV-cut-off filter | 20 mg catalyst dispersed in 100 mL triethanolamine (10 vol%) | 0.286 | [ | |||||||
CdS/Co@NC | Co-catalyst | 420 nm LED lamp with the intensity of 100 mW cm-2 | 2 mg sample and 10 mL 10 vol% lactic acid solution | 21.8 | [ | |||||||
NCDs | Photocatalyst | 450 W Xe lamp | 5 mg CDs in 3 mL methanol (6 vol%) | 0.0187 | [ | |||||||
NCDs/TiO2 | Photosensitizer | 500 W metal halide lamp | 50 mg sample in 25 mL methanol (25 vol%) | 0.196 | [ | |||||||
Carbon nanotubes | Ni-TiO2/CNT | Supporting | Liquid phase plasma | 500 mg sample and 200 mL 10 vol% ethanol solution | 10 | [ | ||||||
WO3-CNT@ MoSe2 | Supporting | Visible-light irradiation using cutoff filter (λ ≥ 400 nm) | 25 mg photocatalyst in 100 mL solution containing 0.1 mol/L Na2S and 0.04 mol/L Na2SO3 | 0.163 | [ | |||||||
CNT-TiO2 | Supporting | Visible light (20 W Sisca white LED) | 5 mg sample in 20 mL DI water | 0.0694 | [ | |||||||
Species | Photocatalyst | Pattern of CNMs | Light source | Reaction medium | Efficiency (mmol·h-1·g-1) | Ref. | ||||||
Cu/CNT-TiO2 | Supporting | Sunlight on sunny days between 10 a.m. and 3 p.m. | 5 mg photocatalyst in 50 mL glycerol aqueous solution (5 vol%) | 54.4 | [ | |||||||
Ni/γ-Al2O3/ CNT-TiO2 | Supporting | Solar light irradiation | 10 mg materials in 50 mL glycerol solution (5 vol%) | 3.4 | [ | |||||||
1%CNT-Pt/TiO2 | Supporting | UV-LED system (384 nm) | 0.5 g·L-1 catalyst | 1.046 | [ | |||||||
Fe@CNTs/ Pd@TiO2 | Supporting | UV 125 W medium pressure Hg lamp | 10 mg materials in 60 mL ethanol solution | 1.638 | [ | |||||||
CN/SWCNT | Supporting | 150 W Xe lamp | 60 mg samples with 1.5 wt% Pt in 80 mL TEOA solution (10 vol%) | ~50 | [ | |||||||
TiO2-Ni(OH)2/ CNT/CdS | Supporting | 300 W Xenon arc light source after filtering the UV light | 50 mg photocatalyst in 20 mL lactic acid and 210 mL water | 12 | [ | |||||||
TiO2-x/CNT | Supporting | 300 W Xeon-lamp with a 420 nm cut-off filter | 50 mg photocatalysts in 80 mL methanol (25 vol%) | 0.2429 | [ | |||||||
AuNPs@NiS @CNT | Supporting | 300 W Arc-Xe lamp | 20 mg photocatalysts in 100 mL TEA solution (15 vol%) | 18.3 | [ | |||||||
Cu3P-CNT | Supporting and co-catalyst | 350 W Xe lamp | 50 mg sample in 80 mL TEOA solution (15 vol%) | 17.22 | [ | |||||||
CNT-GR-TiO2 | Supporting | Oriel Xe-350 W lamp | 5 mg photocatalyst in 50 mL methanol (10 vol%) | 29 | [ | |||||||
Graphene | Ce-Sulfonated GO | Supporting | UV or visible light lamp | 100 mg photocatalyst in 100 mL NaCl solution (17.5 vol%) and 2.0 g Na2S and 5.0 g Na2SO3 | 2.1 (UV light) 0.7 (visible light) | [ | ||||||
NiTiO3/rGO | Supporting and co-catalyst | 100 W linear halogen lamp | 10 mg photocatalyst in 50 mL methanol (5 vol%) | 8.383 | [ | |||||||
SrTiO3/PAN/ x-graphene | Supporting and co-catalyst | 120 W ultraviolet lamp (λ = 254 nm) | 1000 mg catalyst in 20 ml methanol solution (15 vol%) | 0.34 | [ | |||||||
ZnO/rGO/C | Supporting | 300 W Xe lamp | 50 mg sample in 120 mL methanol (25 vol%) | 0.0146 | [ | |||||||
MoS2-graphene/ ZnInS2 | Supporting | 300 W Xenon lamp with cut-off filter (λ > 420 nm) | 50 mg sample in 50 mL aqueous solution containing 0.25 mol/L Na2S and Na2SO3 | 4.167 | [ | |||||||
CdS/MoS2/ graphene | Supporting | 300 W Xenon lamp with a 400 nm cut-off filter | 30 mg catalyst in 50 mL lactic acid solution (10 vol%) | 1.913 | [ | |||||||
Nb6/PPy-RGO | Supporting | 300 W Xe lamp | 50 mg catalyst in 40 mL CH3OH solution (25 vol%) | 0.2076 | [ | |||||||
MoS3/Au@AgNP/rGO | Supporting | 300 W Xe lamp | 10 mg catalysts, 26 mg EY, and 100 mL TEOA solution (15 vol%) | 10.6 | [ | |||||||
graphene-TETA/ CuO | Supporting | 300 W Xenon lamp equipped with an optical filter (λ > 420 nm) | 0.4 g·L-1 catalyst with 12.5 mg Eosin Y, 9 mL TEA and 26 mL water | 5.85 | [ | |||||||
ZnO-ZnS/ graphene | Supporting | 300W high-pressure mercury lamp | 50 mg catalyst in 100 mL glycerol solution (40 vol%) | 1.07 | [ | |||||||
Ag-Bi2WO6- graphene | Supporting | 300 W high-pressure mercury lamp | 50 mg photocatalyst in 100 mL NaCl solution (3 mol/L) and 0.1 mol/L Na2S and 0.04 mol/L Na2SO3 | ~0.25 | [ | |||||||
CuO/rGO | Supporting | 300 W Xenon light | 40 mg catalyst with 1 wt% Pt in 80 mL methanol solution | 19.2 | [ | |||||||
WO3/TiO2/rGO | Supporting | 350 W Xe arc lamp | 50 mg catalyst in 80 mL methanol solution (20 vol%) | ~0.25 | [ | |||||||
CdS/WS2/ graphene | Supporting | 500 W Xeno arc lamp through a UV-cutoff filter (λ > 420 nm) | 8 mg photocatalyst in 8 mL aqueous solution containing 0.35 M mol/L Na2S and 0.25 mol/L Na2SO3 | 1.842 | [ | |||||||
Graphdiyne | GDY-CuI | Photocatalyst | 5 W light emitting diode lamp | 10 mg catalyst in 30 mL TEOA solution (15 vol%) | 9.319 | [ | ||||||
NiTiO3-CuI/GD | Supporting and photocatalyst | 5 W simulated sunlight | 10 mg catalyst in 30 mL TEOA solution (15 vol%) | 0.509 | [ | |||||||
TiO2/γ-GY | Supporting | 300 W Xe arc lamp | 20 mg catalyst in 100 mL methanol solution (10 vol%) | 0.97 | [ | |||||||
TiO2/MoSe2/ γ-graphyne | Supporting | 300 W Xe arc lamp with an optical filter | 20 mg catalyst in 100 mL methanol solution (10 vol%) | 0.8 | [ | |||||||
Mn0.2Cd0.8S/ Graphdiyne | Supporting and photocatalyst | 300 W Xenon lamp with 420 nm filter | — | 9.904 | [ | |||||||
H-GDY/TiO2 | Supporting and photocatalyst | Oriel 300 W Xenon lamp | 10 mg catalyst in 20 mL methanol solution (25 vol%) | 6.2 (UV light) 0.67 (visible light) | [ | |||||||
GDY/g-C3N4 | Supporting and photocatalyst | Xe lamp (350 W) was used as the light source, and a filter (λ > 420 nm) | 50 mg catalysts in 80 mL of TEOA solution (15 vol%) | 0.792 | [ |
Fig. 18. (a) Schematic illustration of the role of typical CNMs as electron acceptor and transport channel in photocatalytic H2 production. (b) Comparison of work function of typical CNMs with the CB of several typical semiconductor photocatalysts.
Fig. 19. Partial and total density of states of free H2O (i), H2O@(101) (ii), H2O@Cu/(101) (iii). The blue areas show where the electron density has been enriched with respect to the fragments, and the yellow areas show where the density has been depleted. Reprinted with permission from Ref. [263]. Copyright 2018, ACS.
Fig. 20. (a) Potential-dependent evolution in Nyquist plots of FeP/CN. (b) Cyclic voltammograms vs overpotential of FeP/XC, FeP/CNT and FeP/CN. (a,b) Reprinted with permission from Ref. [139]. Copyright 2019, RSC. (c) Proposed mechanism of enhanced visible light photocatalysis in DGRAu and GOAu hybrid photocatalysts. Reprinted with permission from Ref. [265]. Copyright 2016, RSC.
Fig. 21. (a) RhCrOx/STO:Al/N-G photocatalysts preparation method. (b) Raman spectra of G (black), N-G (red) and comG (blue). (c) High resolution XPS for C 1s recorded for N-G sample and the best deconvolution for their individual components. Reprinted with permission from Ref. [266]. Copyright 2019, Elsevier.
Fig. 22. (a) Schematic illustration of the synthesis of AA-functionalized CNTs, Pt nanoparticle deposition, and CdS nanohybrids. Digital pictures show the dispersion of CNTs, Af-CNT, Pt-Af-CNTs before and after sonication. FTIR spectrum of pristine MWCNT compared with functional groups presented in (b) Cf-CNT, Nf-CNT, Sf-CNT materials and, (c) Af-CNT, Pt-Af-CNT compared with pure ascorbic acid. Reprinted with permission from Ref. [97]. Copyright 2018, Elsevier.
Fig. 23. (a) Schematic illustration for the synthetic process of hierarchical Co/NGC@ZIS cages. (b) TEM image of p-Co/NGC nanocages; Steady-state PL spectra (c) and EIS spectra (d) of Co/NGC@ZIS and ZnIn2S4. Reprinted with permission from Ref. [270]. Copyright 2019, Wiley.
Fig. 24. (a) Schematic of the formation of the TiO2-x/CNT composites. (b) UV-vis spectra with different samples. (c) Nyquist plots for TiO2, TiO2-x, TiO2/CNT and TiO2-x/CNT. Reprinted with permission from Ref. [284]. Copyright 2017, RSC.
Fig. 25. (a) Schematic diagram of synthesis process for Zn0.5Cd0.5S-MWCNT-TiO2 ternary nanocomposites. (b) Proposed electron/hole transfer mechanism for MWCNT-mediated Z-scheme system. (c) Estimated relative band positions of Zn0.5Cd0.5S-MWCNT-TiO2 nanocomposite. Reprinted with permission from Ref. [285]. Copyright 2017, Elsevier.
Fig. 26. (a) HRTEM images of TiO2/GY-5. (b) Photoluminescence spectra of TiO2/γ-graphyne nanocomposites at an excitation wavelength of 330 nm. (c) UV-vis diffuse reflectance spectra of TiO2/γ-graphyne nanocomposites. (d) Schematic illustration of possible band structures of TiO2/γ-GY nanocomposites. Reprinted with permission from Ref. [119]. Copyright 2018, RSC.
Fig. 27. Schematic illustrating the photocatalytic mechanism for the Ag-TiO2 (a) and Ag-rGO-TiO2 (b) samples under visible light irradiation. Reprinted with permission from Ref. [289]. Copyright 2018, Elsevier.
Fig. 28. (a) Enlarged spectra of the GO, TG, and WTG samples in the range 1100-1750 cm-1. (b) EIS Nyquist plots of the T, W, TG, WT, and WTG samples. (c) Schematic illustration of the S-scheme heterojunction-based charge transfer mechanism in WO3/TiO2/rGO composite. Reprinted with permission from Ref. [290]. Copyright 2020, Elsevier.
Fig. 29. (a) Valence band spectra, inset: the enlarged view of bend edge region and the schematic representation of energy levels. (b) Steady-state photoluminescence spectra of NiPO and RGO modified NiPO. (c) Plausible mechanism for proton reduction reaction by RGO-NiPO photocatalyst. Reprinted with permission from Ref. [291]. Copyright 2019, ACS.
Fig. 30. (a) Schematic diagram for fabrication of Co-graphene composites. Reprinted with permission from Ref. [294]. Copyright 2018, ACS. (b) EXAFS fitting curve of Pt-SAs/C R-space. (c) Calculated Gibbs free energy diagram of HER for Pt/C, Pt-SAsC4 and defect-C at the equilibrium potential. The charge density difference of defect C (d) and Pt-SAs-C4 (e). Yellow and light blue isosurfaces denote an increase and decrease of 0.002 eÅ-3 for electronic density, respectively. Reprinted with permission from Ref. [296]. Copyright 2020, RSC.
Fig. 31. Schematic illustrations of the nanostructures and the calculated DOSs based on the UV-visible diffuse reflectance spectra and the VB-XPS results, for the reference TiO2, C/TiO2 and reduced TiO2. Reprinted with permission from Ref. [303]. Copyright 2014, RSC.
Fig. 32. (a) Schematic illustration for the fabrication of Ag@C@TiO2 NTs core-shell nanocomposite. (b) Schematic illustration of the hydrogen generation and dye degradation process by using the Ag@C@TiO2 NTs core-shell nanocomposite catalyst under simulated visible light irradiation. Reprinted with permission from Ref. [305]. Copyright 2018, ACS.
Strategies | Photocatalyst | Light source | Reaction medium | Efficiency (mmol·h-1·g-1) | Ref. |
---|---|---|---|---|---|
Crucial features tailor | TiO2/C | 8 W UV lamp with spectral emission in the range 400-650 nm | 5 g/L sample in 80 mL glycerol aqueous solution (5 wt%) | 0.424 | [ |
CdS/graphene QDs | 300-W Xe lamp with an optical cut-off filter ((λ > 420 nm) | 40 mg photocatalyst in 100 mL solution containing 0.5 mol/L Na2S and 0.5 mol/L Na2SO3 | 2.385 | [ | |
Cu/rGO | 300 W Xenon lamp | 58 mL of DI water, 10 mL of lactic acid and 1 mL of 2 mmol·L-1 copper acetate solutions | 59 | [ | |
SiC/graphitic C | 300 W Xe lamp | 25 mg sample in 50 mL methanol solution (20 vol%) | 0.1802 | [ | |
r-CDs/Pt | 300 W Xe lamp | 30 mg sample in 100 mL solution that containing 0.7 mol/L Na2S and 0.5 mol/L Na2SO3 | 0.681 | [ | |
Ammonia-S,N-GOD | 300 W xenon lamp | 200 mg sample and 3 wt% Pt and 16 mg H2PtCl6·6H2O in 250 mL TEOA solution (10 vol%) | 0.1 | [ | |
Cd0.5Zn0.5S-CNTs(Cu) | 300 W Xe arc lamp | 20 mg sample in 0.01 mL resin solution and 1 mL ethanol | 2.995 | [ | |
NiO-TiO2-x/C | 300 W Xeon-lamp | 20 mg catalyst in 100 mL methanol solution (20 vol%) | 1.55 | [ | |
TiO2/CuxO/C | 500 W Xe/Hg lamp | 10 mg photocatalyst in 7.5 mL CH3OH and 17.5 mL water | 3.298 | [ | |
Functional group modification | f-CNT/Pt | UV lamp (365 nm, 4400 mW/cm2) | 10 mg catalyst in 100 mL sodium sulfite solution (20 mg/L) | 13.85 | [ |
f-CNT/TiO2 | Solar light | 5 mg of catalyst in 50 mL of a 5 vol% glycerol aqueous solution | 7.476 | [ | |
AgBr/bCNTs/TiO2 | 35 W Xe lamp | 100 mg catalyst in 20 vol% 100 mL methanol solution | 0.477 | [ | |
Co(dcbpy)2(NCS)2/ f-CQDs/CN | 300W Xenon lamp under visible light region (λ > 420 nm). | 50 mg catalyst in 100 mL TEOA solution (10 vol%) | 0.296 | [ | |
ZnO/LFC | 500 W Xe lamp | 20 mg sample in 50 mL SMT aqueous solution (20 mg/L) | 0.029 | [ | |
Doping of hetero elements | SNGODs | 4 W mercury lamp | 0.4 g sample in 250 mL of 0.35 mol·L-1 sugar solution | 0.221 | [ |
N-TiO2/NC | 300 W Xe arc lamp with UV cutoff filter | 100 mg catalyst in 100 mL methanol solution (20 vol%) | 0.103 | [ | |
N-C/Pt@TiO2 | 300 W Xe lamp | 35 mg sample in 100 mL of 20 vol% methanol aqueous solution | 9.086 | [ | |
CoOx@N, S-C/CdS | 300 W Xe lamp | 25 mg catalyst in 50 mL DI water and 1 lactic acid | 0.04 | [ | |
CdS/NC@Mo2N | 300 W Xe lamp | 5 mg sample in 50 mL solution that containing 0.25 mol/L Na2S and 0.35 mol/L Na2SO3 | 7.294 | [ | |
N,C-TiO2/C | 500 W Xe/Hg lamp | 25 mg photocatalyst in 7.5 mL CH3OH and 17.5 mL water | 0.426 | [ | |
Heterostructure | Pt/TiO2/rGO | 8 W Hg lamp | 5 mg sample in 100 mL aqueous solution of glycerol (5 vol%) | 28.5 | [ |
rGO(3%)-CoOx/BMO | 200 W Xe lamp | 50 mg sample in 100 mL distilled water | 0.74 | [ | |
Ag/CQDs/g-C3N4 | 300 W Xenon lamp with cut-off filter (550 nm) or band-pass filters | 5 mg catalyst in 70 mL water solution containing 10 mL TEOA | 0.627 | [ | |
CdS QDs/P-CNT | 300 W Xe-lamp with a 420 nm cutoff filter | 10 mg samples in 100 mL aqueous solution having 0.35 mol/L Na2S and Na2SO3 | 1.579 | [ | |
NiO/CDs/BiVO4 | 300 W Xe-lamp | 10 mg catalyst in 25 mL ultrapure water | 0.121 | [ | |
Porous-rGO/CdS-DETA | 300 W Xe lamp equipped with a 400 nm-cut-off filter | 50 mg catalyst in 100 mL mixed solution containing 0.35 mol/L Na2S and 0.25 mol/L Na2SO3 | 10.5 | [ | |
CD/CdS@MIL-101 | 300 W Xe lamp with a 420 nm cut-off filter | 30 mg photocatalyst in 50 mL of lactic acid solution (10 vol%) | 0.488 | [ | |
rGO-Ag3PO4 | 300 W Xenon lamp with 400 nm cutoff filter | 50 mg sample in 50 mL of 10 vol% methanol solution | 3.69 | [ | |
TiO2-NiCoS-C | 300 W xenon arc lamp | 20 mg sample in 50 mL of 20 vol% methanol solution | 1.29 | [ | |
C-TiO2/WO3 | 300 W Xe arc lamp | 20 mg sample in 70 mL of 36 vol% methanol solution | ~1.5 | [ | |
rGO-Cu2O/Bi2WO6 | 300 W xenon lamp with a 420 nm cut-off filter | 20 mg sample in 100 ml distilled water | 0.002 | [ | |
Cu2O/rGO/BiVO4 | 300 W Xenon lamp | 50 mg sample in 90 ml distilled water | 0.006 | [ | |
SrTiO3@TiO2/C | 300 W UV Xe lamp | 100 mg sample and 2 mL H2PtCl6·6H2O solution (1 g·L-1) in 80 mL methanol solution (25 vol%) | 2.52 (UV light) | [ |
Table 2 Enhancement strategies of CNMs-based photocatalysts in recent five years (2016-2021).
Strategies | Photocatalyst | Light source | Reaction medium | Efficiency (mmol·h-1·g-1) | Ref. |
---|---|---|---|---|---|
Crucial features tailor | TiO2/C | 8 W UV lamp with spectral emission in the range 400-650 nm | 5 g/L sample in 80 mL glycerol aqueous solution (5 wt%) | 0.424 | [ |
CdS/graphene QDs | 300-W Xe lamp with an optical cut-off filter ((λ > 420 nm) | 40 mg photocatalyst in 100 mL solution containing 0.5 mol/L Na2S and 0.5 mol/L Na2SO3 | 2.385 | [ | |
Cu/rGO | 300 W Xenon lamp | 58 mL of DI water, 10 mL of lactic acid and 1 mL of 2 mmol·L-1 copper acetate solutions | 59 | [ | |
SiC/graphitic C | 300 W Xe lamp | 25 mg sample in 50 mL methanol solution (20 vol%) | 0.1802 | [ | |
r-CDs/Pt | 300 W Xe lamp | 30 mg sample in 100 mL solution that containing 0.7 mol/L Na2S and 0.5 mol/L Na2SO3 | 0.681 | [ | |
Ammonia-S,N-GOD | 300 W xenon lamp | 200 mg sample and 3 wt% Pt and 16 mg H2PtCl6·6H2O in 250 mL TEOA solution (10 vol%) | 0.1 | [ | |
Cd0.5Zn0.5S-CNTs(Cu) | 300 W Xe arc lamp | 20 mg sample in 0.01 mL resin solution and 1 mL ethanol | 2.995 | [ | |
NiO-TiO2-x/C | 300 W Xeon-lamp | 20 mg catalyst in 100 mL methanol solution (20 vol%) | 1.55 | [ | |
TiO2/CuxO/C | 500 W Xe/Hg lamp | 10 mg photocatalyst in 7.5 mL CH3OH and 17.5 mL water | 3.298 | [ | |
Functional group modification | f-CNT/Pt | UV lamp (365 nm, 4400 mW/cm2) | 10 mg catalyst in 100 mL sodium sulfite solution (20 mg/L) | 13.85 | [ |
f-CNT/TiO2 | Solar light | 5 mg of catalyst in 50 mL of a 5 vol% glycerol aqueous solution | 7.476 | [ | |
AgBr/bCNTs/TiO2 | 35 W Xe lamp | 100 mg catalyst in 20 vol% 100 mL methanol solution | 0.477 | [ | |
Co(dcbpy)2(NCS)2/ f-CQDs/CN | 300W Xenon lamp under visible light region (λ > 420 nm). | 50 mg catalyst in 100 mL TEOA solution (10 vol%) | 0.296 | [ | |
ZnO/LFC | 500 W Xe lamp | 20 mg sample in 50 mL SMT aqueous solution (20 mg/L) | 0.029 | [ | |
Doping of hetero elements | SNGODs | 4 W mercury lamp | 0.4 g sample in 250 mL of 0.35 mol·L-1 sugar solution | 0.221 | [ |
N-TiO2/NC | 300 W Xe arc lamp with UV cutoff filter | 100 mg catalyst in 100 mL methanol solution (20 vol%) | 0.103 | [ | |
N-C/Pt@TiO2 | 300 W Xe lamp | 35 mg sample in 100 mL of 20 vol% methanol aqueous solution | 9.086 | [ | |
CoOx@N, S-C/CdS | 300 W Xe lamp | 25 mg catalyst in 50 mL DI water and 1 lactic acid | 0.04 | [ | |
CdS/NC@Mo2N | 300 W Xe lamp | 5 mg sample in 50 mL solution that containing 0.25 mol/L Na2S and 0.35 mol/L Na2SO3 | 7.294 | [ | |
N,C-TiO2/C | 500 W Xe/Hg lamp | 25 mg photocatalyst in 7.5 mL CH3OH and 17.5 mL water | 0.426 | [ | |
Heterostructure | Pt/TiO2/rGO | 8 W Hg lamp | 5 mg sample in 100 mL aqueous solution of glycerol (5 vol%) | 28.5 | [ |
rGO(3%)-CoOx/BMO | 200 W Xe lamp | 50 mg sample in 100 mL distilled water | 0.74 | [ | |
Ag/CQDs/g-C3N4 | 300 W Xenon lamp with cut-off filter (550 nm) or band-pass filters | 5 mg catalyst in 70 mL water solution containing 10 mL TEOA | 0.627 | [ | |
CdS QDs/P-CNT | 300 W Xe-lamp with a 420 nm cutoff filter | 10 mg samples in 100 mL aqueous solution having 0.35 mol/L Na2S and Na2SO3 | 1.579 | [ | |
NiO/CDs/BiVO4 | 300 W Xe-lamp | 10 mg catalyst in 25 mL ultrapure water | 0.121 | [ | |
Porous-rGO/CdS-DETA | 300 W Xe lamp equipped with a 400 nm-cut-off filter | 50 mg catalyst in 100 mL mixed solution containing 0.35 mol/L Na2S and 0.25 mol/L Na2SO3 | 10.5 | [ | |
CD/CdS@MIL-101 | 300 W Xe lamp with a 420 nm cut-off filter | 30 mg photocatalyst in 50 mL of lactic acid solution (10 vol%) | 0.488 | [ | |
rGO-Ag3PO4 | 300 W Xenon lamp with 400 nm cutoff filter | 50 mg sample in 50 mL of 10 vol% methanol solution | 3.69 | [ | |
TiO2-NiCoS-C | 300 W xenon arc lamp | 20 mg sample in 50 mL of 20 vol% methanol solution | 1.29 | [ | |
C-TiO2/WO3 | 300 W Xe arc lamp | 20 mg sample in 70 mL of 36 vol% methanol solution | ~1.5 | [ | |
rGO-Cu2O/Bi2WO6 | 300 W xenon lamp with a 420 nm cut-off filter | 20 mg sample in 100 ml distilled water | 0.002 | [ | |
Cu2O/rGO/BiVO4 | 300 W Xenon lamp | 50 mg sample in 90 ml distilled water | 0.006 | [ | |
SrTiO3@TiO2/C | 300 W UV Xe lamp | 100 mg sample and 2 mL H2PtCl6·6H2O solution (1 g·L-1) in 80 mL methanol solution (25 vol%) | 2.52 (UV light) | [ |
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