Chinese Journal of Catalysis ›› 2025, Vol. 70: 207-229.DOI: 10.1016/S1872-2067(24)60212-3
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Yu Huanga,c,1, Lei Zoua,b,1, Yuan-Biao Huanga,b,c,d,*(), Rong Caoa,b,c,d,*(
)
Received:
2024-10-14
Accepted:
2024-12-15
Online:
2025-03-18
Published:
2025-03-20
Contact:
* E-mail: About author:
Yuanbiao Huang (Fujian Institute of Research on the Structure of Matter, Chinese Academy of Science) obtained his PhD (2009) under the supervision of Prof. Guo-Xin Jin from Fudan University. In the same year, he joined Prof. Rong Cao's group at FJIRSM, CAS. In 2014, he joined Prof. Qiang Xu's group at AIST (National Institute of Advanced Industrial Science and Technology) as a JSPS (Japan Society for the Promotion of Science) invited fellow. In 2015, he moved back to FJIRSM, CAS and since 2017, he has been a professor at FJIRSM. His research interests include porous framework materials for CO2 catalysis.Supported by:
Yu Huang, Lei Zou, Yuan-Biao Huang, Rong Cao. Photocatalytic, electrocatalytic and photoelectrocatalytic conversion of methane to alcohol[J]. Chinese Journal of Catalysis, 2025, 70: 207-229.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(24)60212-3
Fig. 1. (a) The proposed mechanism of photocatalysis-Fenton reaction for selective CH4 conversion into methanol on P25. Reprinted with permission form Ref. [61]. Copyright 2020, Royal Society of Chemistry. (b) Production of liquid compounds from the partial photooxidation of CH4 after 4 h. Reprinted with permission form Ref. [62]. Copyright 2022, Elsevier. (c) Representative TEM images of q-BiVO4 with scale bars of 2 nm. (d) Selective oxidation of CH4 to HCHO and CH3OH for 7 h under Xe lamp (400 ≤ λ ≤ 780 nm) over q-BiVO4. (e) Proposed reaction mechanism. Reprinted with permission form Ref. [63]. Copyright 2021, Nature.
Fig. 2. (a) Yields of CH3OH in the photocatalytic oxidation of CH4 in systems of WO3/Fe3+ (2 mmol L−1), WO3/Cu2+ (0.1 mmol L−1), WO3/Ag+ (2 mmol L−1), WO3/H2O2 (2 mmol L−1) and WO3 at ∼55 °C under UVC-visible light irradiation. Reprinted with permission form Ref. [65]. Copyright 2015, Elsevier. (b) Production rates of the photocatalytic products aldehyde (CH3CHO) and ethanol (CH3CH2OH) over CeO2-raw and CeO2-x photocatalysts under simulated sunlight irradiation. Reprinted with permission form Ref. [66]. Copyright 2020, Catalysts. (c) Schematic illustration of the nitrate anion intercalation-decomposition (NID) strategy for the exfoliation of BCN into few-layered C3N4 (fl-CN). (d) Comparison of the H2O2 production rate in photocatalytic O2 reduction over the BCN and fl-CN catalysts. (e) Product distribution over the BCN and fl-CN catalysts in photocatalytic oxidation of CH4 with O2. Reprinted with permission form Ref. [67]. Copyright 2024, Wiley-VCH GmbH. (f) The proposed process of different chemical bonds cleavage on the BN surface. (g) Photocatalytic CH4 oxidation performance of BN. Reprinted with permission form Ref. [69]. Copyright 2023, Wiley-VCH GmbH.
Fig. 3. (a) HRTEM images of 2.5%Ag/TiO2 (001). (b) CH3OH selectivity and product yields of Ag-loaded TiO2 photocatalysts with predominantly exposed (001) facets. (c) Proposed photocatalytic mechanism for CH4 oxidation by O2 on the (001) facets of TiO2. Reprinted with permission form Ref. [70]. Copyright 2021, Nature. (d) CH4/O2 ratio-dependent CH4 oxidation on the as-prepared Ag/InGaN photocatalyst in the presence of water. (e) In situ IR spectrum of photocatalytic CH4 oxidation on Ag/InGaN. Reprinted with permission form Ref. [71]. Copyright 2024, Royal Society of Chemistry.
Fig. 4. (a) Product yields and liquid product selectivity at different pressure of CH4. (b) Sketch of the proposed reaction mechanism for photocatalytic CH4 oxidation to CH3OOH, CH3OH, and HCHO. Reprinted with permission form Ref. [72]. Copyright 2019, American Chemical Society. (c) Scheme for the synthetic route of Aux/ZnO (x = 0.08, 0.15,0.30, 0.75, 1.57 and 1.79). (d) Photocatalytic CH4 conversion over different loading amounts of Au on ZnO (Aux/ZnO, x = 0.08, 0.15, 0.30, 0.75, 1.57 and 1.79). Reprinted with permission form Ref. [73]. Copyright 2020, Royal Society of Chemistry. (e) Proposed mechanism of photocatalytic conversion of CH4 to HCHO or CH3OH on Au1/In2O3 or AuNPs/In2O3, respectively. Reprinted with permission form Ref. [74]. Copyright 2023, American Chemical Society.
Fig. 5. (a) Proposed reaction process of photocatalytic CH4 oxidation on Au/TiO2 and Au-CoOx/TiO2 using O2 as the oxidant. (b) Product yields and primary product selectivity on CoOx/TiO2 loaded with or without nanometals after a 2 h reaction. Reprinted with permission form Ref. [75]. Copyright 2020, American Chemical Society. (c) Comparison of the catalytic performance for various photocatalysts. (d) Proposed photocatalytic mechanism for CH4 oxidation over Cu-W-TiO2. Reprinted with permission form Ref. [76]. Copyright 2022, American Chemical Society. (e) Schematic illustration of photocatalytic CH4 conversion over Au0.2Cu0.15-ZnO photocatalysts. (f) Photocatalytic direct CH4 the conversion and the selectivity of the primary products on Aux-ZnO. (g) Photocatalytic direct CH4 the conversion and the selectivity of the primary products on Au0.2Cuy-ZnO. Reprinted with permission form Ref. [77]. Copyright 2022, American Chemical Society. (h) Photocatalytic CH4 conversion over AuPd/ZnO with varied molar ratio of Au to Pd. Reprinted with permission form Ref. [78]. Copyright 2024, Wiley-VCH GmbH.
Fig. 6. (a) Reaction energy profile of CH4 to CH3OH over Au1/WO3 and AuPs/WO3. (b) Comparison of photocatalytic CH4 oxidation products of under visible light (λ ≥ 420 nm) at room temperature (25 °C). (c) Corresponding yields of CH3OH per mole of Au over WO3, AuPs/WO3, and Au1/WO3 catalysts. Reprinted with permission form Ref. [79]. Copyright 2022, Elsevier. (d) Band energy diagram of 2DT, Pd1/2DT, and 3DT (P25). (e) Activity of Pd1/2DT for CH4 oxidation. (f) Proposed catalytic mechanism for the oxidation of methane to methanol. Reprinted with permission form Ref. [80]. Copyright 2021, American Chemical Society.
Fig. 7. (a) Scheme of the photoactivation of different components in the Bi-V-HBEA photocatalyst. (b) CH3OH and C2H6 productivity obtained with the three samples HBEA, V-HBEA, and Bi-V-HBEA at different times during the photocatalytic tests. Reprinted with permission form Ref. [82]. Copyright 2017, American Chemical Society. (c) View of the structure of PMOF-RuFe(OH) incorporating mono-iron hydroxyl. (d) Schematic showing synergic catalysis in PMOF-RuFe(OH) for selective photo-activation of the C-H bond in CH4 to CH3OH in the presence of oxygen and water. (e) Comparison of the catalytic activity for photo-oxidation of CH4 to CH3OH over PMOF-RuFe(OH) with other photocatalysts. (f) Calculated energy profiles for the activation of C-H bond in CH4 over confined mono-iron hydroxyl sites. Reprinted with permission form Ref. [83]. Copyright 2022, Nature.
Fig. 8. (a) Proposed reaction scheme for photocatalytic conversion of CH4. (b) Photocatalytic activities for conversion of CH4 of the samples at CH4 (1000 ppm) and pure air atmosphere under irradiation of full spectrum light: the yield of CH3OH for the pure g-C3N4, 10CW, 30CW, 70CW, and pure Cs0.33WO3 samples. Reprinted with permission form Ref. [86]. Copyright 2019, American Chemical Society. (c) Schematic of the photocatalytic CH4 oxidation to ethanol by the hollow CeO2@PdO@FeOx nanosphere photocatalyst. (d) Photocatalytic production rates of liquid and gas products over CeO2, CeO2@PdO, and CeO2@PdO@FeOx. (e) ΔG of the *CH3-*CO coupling on PdFe-PdCe sites with different *CO coverages. Reprinted with permission form Ref. [88]. Copyright 2024, American Chemical Society. (f) 2D in-plane Z-scheme heterostructures composed of two different metal oxides and conventional single metal oxide semiconductor for selective CH4 photooxidation. (g) Free energy diagrams for CH4 oxidation over the ZnO/Fe2O3 porous nanosheet slab and the ZnO porous nanosheet slab. (h) Product yield over the ZnO/Fe2O3 porous nanosheets and the ZnO porous nanosheets. Reprinted with permission form Ref. [89]. Copyright 2022, American Chemical Society.
Sample | Wavelength (nm) | Product | Activity | Selectivity (%) | Ref. |
---|---|---|---|---|---|
TiO2 | Full-spectrum | CH3OH | 471 μmol g−1 h−1 | 83 | [ |
Bi2O3 | 380 ≤ λ ≤ 760 | CH3OH | 3771 μmol g−1 h−1 | 65 | [ |
q-BiVO4 | 300 ≤ λ ≤ 600 | CH3OH | 766.7 μmol g−1 h−1 | 92.8 | [ |
WO3 | λ ≥185 | CH3OH | 67.5 μmol g−1 h−1 | 37.4 | [ |
CeO2 | Full-spectrum | C2H5OH | 11.4 µmol gcat−1 h−1 | 91.5 | [ |
fl-CN-530 | 300 ≤ λ ≤ 780 | CH3OH | 12.3 µmol | 50.8 | [ |
Ag/TiO2 | 300 ≤ λ ≤ 500 | CH3OH | 4.8 mmol g−1 h−1 | 80 | [ |
Ag/InGaN | Full-spectrum | CH3OH | 45.5 mmol g−1 h−1 | 93.3 | [ |
Au/ZnO | 300 ≤ λ ≤ 500 | CH3OH | 2.06 mmol g−1 h−1 | 15.67 | [ |
Au0.75/ZnO | Full-spectrum | CH3OH | 1.37 mmol g−1 | 99.1 | [ |
AuNPs/In2O3 | 300 ≤ λ ≤ 1100 | CH3OH | 1.98 mmol g−1 h−1 | 89.4 | [ |
Au-CoOx/TiO2 | 300 ≤ λ ≤ 500 | CH3OH CH3OOH | 2.54 mmol g−1 h−1 | 95 | [ |
Cu-W-TiO2 | 350 ≤ λ ≤ 760 | CH3OH CH3OOH | 8.66 mmol g−1 h−1 | 50.2 | [ |
Au0.2Cu0.15- ZnO | Full-spectrum | CH3OOH CH3OH | 8888 μmol g−1 h−1 | ~80 | [ |
Au9Pd1/ZnO | λ ≥ 380 | CH3OH | 6267 µmol g−1 h−1 | 46.7 | [ |
Au1/WO3 | λ ≥ 420 | CH3OH | 589 µmol g−1 h−1 | 75 | [ |
Pd1/2DT | λ ≥ 420 | CH3OH | 43.75 µmol g−1 h−1 | 94 | [ |
Bi-V-HBEA | UV light | CH3OH | 10.7 µmol g−1 h−1 | 6.4 | [ |
PMOF- RuFe(OH) | 400 ≤ λ ≤ 780 | CH3OH | 8.81 ± 0.34 mmol gcat−1 h−1 | ~100 | [ |
Fe@PCN-222 | λ ≥ 420 | CH3OH | 310 µmol g−1 h−1 | 28.84 | [ |
TiO2/TiOF2 | 380 ≤ λ ≤ 760 | CH3OH | 0.7527 µmol g−1 h−1 | — | [ |
CeO2@PdO @FeOx | Full-spectrum | C2H5OH | 728 μmol g−1 h−1 | >85 | [ |
ZnO/Fe2O3 | Full-spectrum | CH3OH | 178.3 μmol−1 gcat−1 | ~100 | [ |
Table 1 Summary of photocatalytic CH4 oxidation to alcohol.
Sample | Wavelength (nm) | Product | Activity | Selectivity (%) | Ref. |
---|---|---|---|---|---|
TiO2 | Full-spectrum | CH3OH | 471 μmol g−1 h−1 | 83 | [ |
Bi2O3 | 380 ≤ λ ≤ 760 | CH3OH | 3771 μmol g−1 h−1 | 65 | [ |
q-BiVO4 | 300 ≤ λ ≤ 600 | CH3OH | 766.7 μmol g−1 h−1 | 92.8 | [ |
WO3 | λ ≥185 | CH3OH | 67.5 μmol g−1 h−1 | 37.4 | [ |
CeO2 | Full-spectrum | C2H5OH | 11.4 µmol gcat−1 h−1 | 91.5 | [ |
fl-CN-530 | 300 ≤ λ ≤ 780 | CH3OH | 12.3 µmol | 50.8 | [ |
Ag/TiO2 | 300 ≤ λ ≤ 500 | CH3OH | 4.8 mmol g−1 h−1 | 80 | [ |
Ag/InGaN | Full-spectrum | CH3OH | 45.5 mmol g−1 h−1 | 93.3 | [ |
Au/ZnO | 300 ≤ λ ≤ 500 | CH3OH | 2.06 mmol g−1 h−1 | 15.67 | [ |
Au0.75/ZnO | Full-spectrum | CH3OH | 1.37 mmol g−1 | 99.1 | [ |
AuNPs/In2O3 | 300 ≤ λ ≤ 1100 | CH3OH | 1.98 mmol g−1 h−1 | 89.4 | [ |
Au-CoOx/TiO2 | 300 ≤ λ ≤ 500 | CH3OH CH3OOH | 2.54 mmol g−1 h−1 | 95 | [ |
Cu-W-TiO2 | 350 ≤ λ ≤ 760 | CH3OH CH3OOH | 8.66 mmol g−1 h−1 | 50.2 | [ |
Au0.2Cu0.15- ZnO | Full-spectrum | CH3OOH CH3OH | 8888 μmol g−1 h−1 | ~80 | [ |
Au9Pd1/ZnO | λ ≥ 380 | CH3OH | 6267 µmol g−1 h−1 | 46.7 | [ |
Au1/WO3 | λ ≥ 420 | CH3OH | 589 µmol g−1 h−1 | 75 | [ |
Pd1/2DT | λ ≥ 420 | CH3OH | 43.75 µmol g−1 h−1 | 94 | [ |
Bi-V-HBEA | UV light | CH3OH | 10.7 µmol g−1 h−1 | 6.4 | [ |
PMOF- RuFe(OH) | 400 ≤ λ ≤ 780 | CH3OH | 8.81 ± 0.34 mmol gcat−1 h−1 | ~100 | [ |
Fe@PCN-222 | λ ≥ 420 | CH3OH | 310 µmol g−1 h−1 | 28.84 | [ |
TiO2/TiOF2 | 380 ≤ λ ≤ 760 | CH3OH | 0.7527 µmol g−1 h−1 | — | [ |
CeO2@PdO @FeOx | Full-spectrum | C2H5OH | 728 μmol g−1 h−1 | >85 | [ |
ZnO/Fe2O3 | Full-spectrum | CH3OH | 178.3 μmol−1 gcat−1 | ~100 | [ |
Fig. 9. (a) Amounts of CH4 oxidation products generated in the EMOR reactor versus reaction time. Reprinted with permission form Ref. [92]. Copyright 2019, American Chemical Society. (b) Product selectivity after 10, 20, 40, 60, 90, and 120 min of CH4 electrochemical conversion by Rh/Al2O3 modified with NH4BF4. (c) Product selectivity after 20, 40, 60, 90, and 120 min of CH4 electrochemical conversion by Cu/Al2O3 modified with NH4BF4. (d) The schematic mechanism for the formation of Brønsted acid sites on the catalyst surface. Reprinted with permission form Ref. [93]. Copyright 2023, Elsevier. (e) A scheme depicting the preparation of a Fe-N-C SAC. (f) The selectivity of oxygenate products at various potentials. Reprinted with permission form Ref. [94]. Copyright 2023, The Royal Society of Chemistry.
Fig. 10. (a) Production yield rates and ethanol selectivity. (b) Reaction energy profiles for CH4 electrocatalytic oxidation to ethanol on the surfaces of WO3 and Ov-WO3 respectively. Reprinted with permission form Ref. [95]. Copyright 2023, Elsevier. (c) The average formation rate and total FE of the generated oxygenates at different current density for 0.5 h. (d) Side views of the optimized configurations of the V2O5 (001) and Ov-V2O5(001) surfaces. Reprinted with permission form Ref. [96]. Copyright 2023, Elsevier. (e) Illustration of the formation of CoyNi1-y-Fe2 PBA and its derived catalysts. (f) After electrolysis for two hours at different electrode potentials, the product yield of CH3OH and 2-propanol. (g) FE of CH3OH and 2-propanol. Reprinted with permission form Ref. [97]. Copyright 2022, The Royal Society of Chemistry.
Fig. 11. (a) Schematic illustration of synthesis procedures of Rh/ZnO nanosheets and electrochemical oxidation of CH4 to C2H5OH. (b) FE of C2H5OH for ZnO and x% Rh/ZnO (x = 0.3, 0.6, 1.0) under different applied potentials. Reprinted with permission form Ref. [99]. Copyright 2021, American Chemical Society. (c) A possible scheme for the catalytic conversion of CH4 into CH3OH on NiO-V2O5/Rh catalyst. Reprinted with permission form Ref. [100]. Copyright 2020, Elsevier. (d) FEs and (e) yields of the anodic products C2H5OH and CH3OH over NiO/Ni catalysts at various applied potentials. (f) Calculated reaction energy profiles for CH4 electrooxidation to form C2H5OH and CH3OH at the NiO (200)/Ni (111) interface. The insets: the transition state (TS) structures for CH3OH* and CH2* formations. Colors: Ni (blue), O (red), and H (white). Reprinted with permission form Ref. [101]. Copyright 2020, Elsevier. (g) Schematic illustration of electrocatalytic CH4 conversion using a NiO@NiHF anode. Reprinted with permission form Ref. [102]. Copyright 2020, Elsevier.
Fig. 12. (a) Energy level diagram for the NiO/ZnO heterojunction. (b) Selectivity for oxygenates with NiO/ZnO nanorod catalysts of various lengths. Reprinted with permission form Ref. [103]. Copyright 2023, Elsevier. (c) Production efficiencies of the products of 1-propanol, 2-propanol, and acetaldehyde at different reaction times. (d) Reaction mechanism analysis. Reprinted with permission form Ref. [104]. Copyright 2017, WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. (e) Fabrication of the ZrO2 NT/Co3O4 catalyst. (f) Production rate after 3, 6 and 12 h at 1.6 V (vs. RHE). Reprinted with permission form Ref. [105]. Copyright 2021, Elsevier. (g) The corresponding activation energy vs reaction coordinate, (h) the 2p density of states of surface O of the Fermi level, (i) the charge density difference of the ZrO2:Cu2O(111) system. Reprinted with permission form Ref. [107]. Copyright 2021, Elsevier.
Sample | Electrolyte | Potential | Product | Activity | Selectivity (%) | FE (%) | Ref. |
---|---|---|---|---|---|---|---|
Cu/Al2O3 | KHCO3 (0.5 mol L−1) | 2 VPt | C2H5OH | 37.14 μmol h−1 cm−2 | 85 | 90 | [ |
Fe-N-C | KOH (0.1 mol L−1) | 1.6 VRHE | C2H5OH | 4668.3 μmol gcat−1 h−1 | 85 | 68 | [ |
Ov-WO3 | 0.1 mol L−1 Na2SO4 (pH = 2) | 1.2 VRHE | C2H5OH | 125090 μmol gcat−1 h−1 | 99.4 | 50.7 | [ |
Ov-V2O5 | [BMIM]BF4 | 1.15 VAg/Ag+ | CH3OH | 352.5 μmol gcat−1 h−1 | >70 | 61.1 | [ |
CoyNi1-yFe2O4 | Na2SO4 (0.1 mol L−1) | 0.8 VAg/AgCl | CH3OH | 1925.4 μmol gcat−1 h−1 | 82.8 | 9.03 | [ |
LaCo0.5Fe0.5O3 | [BMIM]BF4 | 0.8 VAg/AgCl | CH3OH | 39.3 μmol gcat−1 h−1 | — | 92.4 | [ |
Rh/ZnO | KOH (0.1 mol L−1) | 2.2 VRHE | C2H5OH | 789 μmol gcat−1 h−1 | 85 | 22.5 | [ |
NiO-V2O5/Rh | — | — | CH3OH | 0.65 mol g−1 h−1 | 97.9 | 91 | [ |
NiO/Ni | NaOH (0.1 mol L−1) | 1.4 VRHE | C2H5OH | 25 μmol gNiO−1 h−1 | 87 | 89 | [ |
NiO@NiHF | NaOH (0.1 mol L−1) | 1.46 VRHE | C2H5OH | — | — | 85 | [ |
NiO/ZnO | Na2CO3 (0.5 mol L−1) | 1.5 VSCE | C2H5OH | 1084.2 μmol gNiO−1 h−1 | 81 | — | [ |
Co3O4/ZrO2 | Na2CO3 (0.5 mol L−1) | 2 VRHE | C3H7OH | 3255.7 μmol g−1 h−1 3205.5μmol g−1 h−1 | >60 | — | [ |
ZrO2 NT/Co3O4 | Na2CO3 (0.5 mol L−1) | 1.6 VRHE | C3H7OH | 2416 μmol gcat−1 h−1 | >92 | — | [ |
ZrO2:NiCo2O4 | Na2CO3 (0.5 mol L−1) | 2 VPt | C3H7OH | 2500 μmol gcat−1 h−1 | >90 | — | [ |
Table 2 Summary of electrocatalytic CH4 oxidation to liquid products.
Sample | Electrolyte | Potential | Product | Activity | Selectivity (%) | FE (%) | Ref. |
---|---|---|---|---|---|---|---|
Cu/Al2O3 | KHCO3 (0.5 mol L−1) | 2 VPt | C2H5OH | 37.14 μmol h−1 cm−2 | 85 | 90 | [ |
Fe-N-C | KOH (0.1 mol L−1) | 1.6 VRHE | C2H5OH | 4668.3 μmol gcat−1 h−1 | 85 | 68 | [ |
Ov-WO3 | 0.1 mol L−1 Na2SO4 (pH = 2) | 1.2 VRHE | C2H5OH | 125090 μmol gcat−1 h−1 | 99.4 | 50.7 | [ |
Ov-V2O5 | [BMIM]BF4 | 1.15 VAg/Ag+ | CH3OH | 352.5 μmol gcat−1 h−1 | >70 | 61.1 | [ |
CoyNi1-yFe2O4 | Na2SO4 (0.1 mol L−1) | 0.8 VAg/AgCl | CH3OH | 1925.4 μmol gcat−1 h−1 | 82.8 | 9.03 | [ |
LaCo0.5Fe0.5O3 | [BMIM]BF4 | 0.8 VAg/AgCl | CH3OH | 39.3 μmol gcat−1 h−1 | — | 92.4 | [ |
Rh/ZnO | KOH (0.1 mol L−1) | 2.2 VRHE | C2H5OH | 789 μmol gcat−1 h−1 | 85 | 22.5 | [ |
NiO-V2O5/Rh | — | — | CH3OH | 0.65 mol g−1 h−1 | 97.9 | 91 | [ |
NiO/Ni | NaOH (0.1 mol L−1) | 1.4 VRHE | C2H5OH | 25 μmol gNiO−1 h−1 | 87 | 89 | [ |
NiO@NiHF | NaOH (0.1 mol L−1) | 1.46 VRHE | C2H5OH | — | — | 85 | [ |
NiO/ZnO | Na2CO3 (0.5 mol L−1) | 1.5 VSCE | C2H5OH | 1084.2 μmol gNiO−1 h−1 | 81 | — | [ |
Co3O4/ZrO2 | Na2CO3 (0.5 mol L−1) | 2 VRHE | C3H7OH | 3255.7 μmol g−1 h−1 3205.5μmol g−1 h−1 | >60 | — | [ |
ZrO2 NT/Co3O4 | Na2CO3 (0.5 mol L−1) | 1.6 VRHE | C3H7OH | 2416 μmol gcat−1 h−1 | >92 | — | [ |
ZrO2:NiCo2O4 | Na2CO3 (0.5 mol L−1) | 2 VPt | C3H7OH | 2500 μmol gcat−1 h−1 | >90 | — | [ |
Fig. 13. (a) The atomic structures of •OH adsorption on twinning W atoms of (010) facet, (100) facet and (001) facet. (b) Production rate of EG produced in photoelectrocatalytic CH4 conversion on WO3 photoanodes with different (010) facet ratios at a range of potentials under 100 mWcm-2 illumination. (c) Schematic illustration of the proposed reaction mechanism for photoelectrocatalytic CH4 conversion into EG. Reprinted with permission form Ref. [108]. Copyright 2021, Wiley-VCH GmbH. (d) Production yields of S200/30-15 at different potentials (e) Reaction energy of Ov-activated CH3OH to CH2OH and (f) CH4 to CH3 on the WO3 + Ov (100) slab, respectively. Reprinted with permission form Ref. [109]. Copyright 2023, Elsevier. (g) FE for bare (blank) and reduced (shaded) WO3 NTs electrodes. (h) Free energy diagram of water decomposition on the WO3 (100) surface at pH = 2 and 0.7 V vs. RHE. (i) Schematic depicting the overall band diagrams of bare and reduced WO3 NTs. Reprinted with permission form Ref. [110]. Copyright 2023, American Chemical Society.
Fig. 14. (a) Stepwise synthetic procedure and structure of ZnO/graphene/PANI composite. (b) Yields of CH3OH in the photoelectrocatalytic oxidation of CH4 with catalyst of ZnO NWAs, ZnO/graphene, ZnO/PANI, and ZnO/graphene/PANI composites under simulated sunlight illumination. Reprinted with permission form Ref. [112]. Copyright 2019, Chinese Physical Society. (c) Total production of liquid chemicals from partial oxidation of CH4 of different electrodes consisting of as-synthesized SnO2-rutile, commercial TiO2-anatase, and as-synthesized TiO2:SnO2 heterostructure induced by photocatalysis (P), electrocatalysis (E), and photoelectrocatalysis (PE) sources. Reprinted with permission form Ref. [113]. Copyright 2023, Elsevier.
Sample | Wavelength (nm) | Potential | Product | Activity | Selectivity (%) | Ref. |
---|---|---|---|---|---|---|
WO3 | simulated solar | 1.3 VRHE | (CH2OH)2 | 0.47 mmol cm−2 h−1 | 66 | [ |
WO3 NSs | — | 0.9 VRHE | C2H5OH | 98900 μmol gcat−1 h−1 | 92 | [ |
WO3 NTs | 300 ≤ λ ≤ 800 | 0.7 VRHE | CH3OH | 0.174 μmol cm−2 h−1 | 69.4 | [ |
ZnO/Au NWAs | 400 ≤ λ ≤ 1100 | 1.0 VAg/AgCl | CH3OH | 1.688 μmol mL−1 h−1 | — | [ |
ZnO/graphene/PANI | 400 ≤ λ ≤ 1100 | 1.0 VAg/AgCl | CH3OH | 0.49 μmol mL−1 h−1 | — | [ |
TiO2:SnO2 | — | 1.3 VAg/AgCl | CH3OH | 30 μmol cm−2 h−1 | — | [ |
Table 3 Summary of photoelectrocatalyst for CH4 oxidation to alcohol products.
Sample | Wavelength (nm) | Potential | Product | Activity | Selectivity (%) | Ref. |
---|---|---|---|---|---|---|
WO3 | simulated solar | 1.3 VRHE | (CH2OH)2 | 0.47 mmol cm−2 h−1 | 66 | [ |
WO3 NSs | — | 0.9 VRHE | C2H5OH | 98900 μmol gcat−1 h−1 | 92 | [ |
WO3 NTs | 300 ≤ λ ≤ 800 | 0.7 VRHE | CH3OH | 0.174 μmol cm−2 h−1 | 69.4 | [ |
ZnO/Au NWAs | 400 ≤ λ ≤ 1100 | 1.0 VAg/AgCl | CH3OH | 1.688 μmol mL−1 h−1 | — | [ |
ZnO/graphene/PANI | 400 ≤ λ ≤ 1100 | 1.0 VAg/AgCl | CH3OH | 0.49 μmol mL−1 h−1 | — | [ |
TiO2:SnO2 | — | 1.3 VAg/AgCl | CH3OH | 30 μmol cm−2 h−1 | — | [ |
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