基于溶液化学策略构建背接触FTO/赤铁矿光阳极界面工程的高效光催化水氧化研究

doi:10.1016/S1872-2067(21)63973-6

催化学报 ›› 2022, Vol. 43 ›› Issue (5): 1247-1257.DOI: 10.1016/S1872-2067(21)63973-6

基于溶液化学策略构建背接触FTO/赤铁矿光阳极界面工程的高效光催化水氧化研究

Karen Cristina Bedin^a^,^b, Beatriz Mouriño^a, Ingrid Rodríguez-Gutiérrez^a^,^b, João Batista Souza Junior^a, Gabriel Trindade dos Santos^a^,^c, Jefferson Bettini^a, Carlos Alberto Rodrigues Costa^a, Lionel Vayssieres^d(), Flavio Leandro Souza^a^,^b()

^a巴西能源和材料研究中心, 国家纳米技术实验室, 坎皮纳斯13083-970, 巴西
^bABC联邦大学, 自然和人文科学中心, 圣安德烈, 巴西
^c南里奥格兰德联邦大学, 南里奥格兰德, 巴西
^d西安交通大学能源与电力工程学院, 电力工程多相流国家重点实验室, 可再生能源国际研究中心(IRCRE), 陕西西安710049, 中国

收稿日期:2021-10-01 接受日期:2021-11-11 出版日期:2022-05-18 发布日期:2022-03-23
通讯作者: Lionel Vayssieres,Flavio Leandro Souza
基金资助:
CNPq, CAPES, FAPESP (2017/02317-2 and 2017/11986-5);Shell and the strategic importance of the support given by ANP (Brazil’s National Oil, Natural Gas and Biofuels Agency) through the R&D levy regulation (Grant PRH49/UFABC-ANP)

Solution chemistry back-contact FTO/hematite interface engineering for efficient photocatalytic water oxidation

^aThe National Nanotechnology Laboratory (LNNANO), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas 13083-970, Brazil
^bCentro de Ciências Naturais e Humanas (CCNH), Federal University of ABC (UFABC), Santo André 09210580, Brazil
^cFederal University of Rio Grande do Sul (UFRGS), Rio Grande do Sul, Brazil
^dInternational Research Center for Renewable Energy (IRCRE), State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, China

Received:2021-10-01 Accepted:2021-11-11 Online:2022-05-18 Published:2022-03-23
Contact: Lionel Vayssieres, Flavio Leandro Souza
Supported by:
CNPq, CAPES, FAPESP (2017/02317-2), FAPESP (2017/11986-5);Shell and the strategic importance of the supportgiven by ANP (Brazil’s National Oil, Natural Gas and Biofuels Agency) through the R&D levy regulation, PRH49/UFABC‐ANP for the fellowship, the National Natural Science Foundation of China (NSFC), the Outstanding Talent Program of Shaanxi Province as well as FAPESP (2017/11986-5)

摘要/Abstract

摘要：

本文采用一种简单、有效的规模化溶液化学策略, 在基底(如商用氟掺杂氧化锡透明导电涂层玻璃(FTO))和光活性薄膜(如赤铁矿)之间形成丰富的背接触界面, 并用于低成本水氧化反应. 高分辨率电子显微镜(扫描电镜、透射电镜、扫描透射电镜)、原子力显微镜、元素成像(电子能量损失谱和能量色散谱)和光电化学研究表明, 可通过前驱体溶液的化学成分工程来有效降低机械应力、晶格失配、电子势垒和FTO与赤铁矿在背面接触界面之间的空隙以及FTO与电解液之间的短路和有害反应, 进而提升这些低成本光阳极对水氧化反应以及PEC水分解清洁、可持续地生产氢气的整体效率. 本研究对通过最小化在介孔电极的背接触界面和晶粒边界上的电子-空穴复合, 进而提高电荷收集效率具有重要意义, 可提高低成本PEC水裂解装置的整体效率和规模化的能力.

关键词: 纳米结构, 氧化铁, 水氧化, 光阳极, 表面工程, 化学合成

Abstract:

This work describes a simple yet powerful scalable solution chemistry strategy to create back-contact rich interfaces between substrates such as commercial transparent conducting fluorine-doped tin oxide coated glass (FTO) and photoactive thin films such as hematite for low-cost water oxidation reaction. High-resolution electron microscopy (SEM, TEM, STEM), atomic force microscopy (AFM), elemental chemical mapping (EELS, EDS) and photoelectrochemical (PEC) investigations reveal that the mechanical stress, lattice mismatch, electron energy barrier, and voids between FTO and hematite at the back-contact interface as well as short-circuit and detrimental reaction between FTO and the electrolyte can be alleviated by engineering the chemical composition of the precursor solutions, thus increasing the overall efficiency of these low-cost photoanodes for water oxidation reaction for a clean and sustainable generation of hydrogen from PEC water-splitting. These findings are of significant importance to improve the charge collection efficiency by minimizing electron-hole recombination observed at back-contact interfaces and grain boundaries in mesoporous electrodes, thus improving the overall efficiency and scalability of low-cost PEC water splitting devices.

Key words: Nanostructure, Iron oxide, Water oxidation, Photoanode, Surface engineering, Chemical synthesis

Karen Cristina Bedin, Beatriz Mouriño, Ingrid Rodríguez-Gutiérrez, João Batista Souza Junior, Gabriel Trindade dos Santos, Jefferson Bettini, Carlos Alberto Rodrigues Costa, Lionel Vayssieres, Flavio Leandro Souza. 基于溶液化学策略构建背接触FTO/赤铁矿光阳极界面工程的高效光催化水氧化研究[J]. 催化学报, 2022, 43(5): 1247-1257.

Karen Cristina Bedin, Beatriz Mouriño, Ingrid Rodríguez-Gutiérrez, João Batista Souza Junior, Gabriel Trindade dos Santos, Jefferson Bettini, Carlos Alberto Rodrigues Costa, Lionel Vayssieres, Flavio Leandro Souza. Solution chemistry back-contact FTO/hematite interface engineering for efficient photocatalytic water oxidation[J]. Chinese Journal of Catalysis, 2022, 43(5): 1247-1257.

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链接本文: https://www.cjcatal.com/CN/10.1016/S1872-2067(21)63973-6

https://www.cjcatal.com/CN/Y2022/V43/I5/1247

图/表 12

Fig. 1. Schematic representation of the polymeric precursor solution preparation and thin films fabrication process for pristine and Zr-modified hematite photoelectrodes.

Fig. 2. STEM images of hematite single solvent (a) and mixing solvent (b) and Zr4+ addition layers. Bottom: Magnified regions represented by red squares highlighting the contrast of poor and rich contact between photocatalyst thin film and commercial FTO glass substrate.

Fig. 3. Schematic representation of the different molecular configurations leading to better contact interface between FTO and photocatalyst during thermal treatment. More suitable molecular packing along with the Zr4+ segregation at hematite surface is providing an appropriate environment for the growth of a back-contact-rich interface.

Fig. 4. TEM images of pristine hematite/FTO interface showing (a) low magnification image and HRTEM images at two different magnifications for (b) the tip of FTO/hematite interface (white box in image a) and (c) filtered HRTEM of lateral FTO (SnO2)/hematite interface (white box in image (d); (e,f) Fast Fourier Transform (FFT) images of hematite and FTO (SnO2) regions in image c indexed with the crystallographic planes in green and red dots along with the zone axis in the right side bottom corner of the images. TEM images of FTO/ZrH3% interface (hematite containing Zr) showing (f) low magnification image and HRTEM images with two magnifications for (g) the lateral interface and (h) filtered HRTEM of lateral FTO/ZrH3% interface (white box in image h), (i,j) FFT images of hematite (α-Fe2O3) and FTO (SnO2) regions in image h.

Fig. 5. (a) Linear sweep voltammograms of pristine hematite, ZrH1%, ZrH2%, ZrH3% and ZrH4% measured in 1.0 mol/L NaOH at scan rate of 10 mV s-1. The solid lines represent the response under AM 1.5G illumination (100 mW cm-2) and the dashed lines under dark conditions, and (b) Overall efficiency (ƞoverall) obtained for the ratio Jph/Jabs for all the prepared thin films, (c) Photocurrent densities extracted at 1.23 V (RHE) from literature using the same chemical procedure method and similar planar thin film morphology showing a Si4+-doped (black line, ) [17], Cu2+-doped (blue line, ) [31], pristine Hematite multiple layers (green line, ) [27], Sn4+-doped/FeNi (orange line, ) [28], and the ZrH3%/FeNi (present work, red line, ). The reported photocurrent densities were measured in 1.0 mol/L NaOH aqueous solution at pH = 13.6.

Fig. 6. (a) EIS spectra for pristine-H (black line, ) and ZrH3%/FeNi (red line, ) measured at 1.23 V vs. RHE under illuminated conditions; the dashed lines represent the fitting curves obtained from the equivalent circuit inserted in a). (b) Mott-Schottky plots recorded at 1 kHz in dark condition for Pristine-H and ZrH3%/FeNi. Solid lines represent the linear fit to the selected experimental data. The experiment was measured in 1.0 mol/L NaOH solution at pH = 13.6.

Table 1 Fitting parameters derived from the photoelectrochemical Impedance Spectroscopy of H and ZrH3%/FeNi photoanodes at 1.23 V (V vs. RHE).

photoanode	R_s (W)	R_bulk (W)	C_bulk (F)	R_ss (W)	CPE_ss (F)
H	20.04	540	1.86E-05	361.9	2.73E-05
ZrH3%/FeNi	14.01	197.1	2.11E-05	21.51	1.52E-05

Fig. 7. Cross-section SEM images for FTO (a), pristine hematite (b), ZrH3% (c), ZrH3%/FeNi (d) and their corresponding AFM topographical images (e).

Fig. 8. STEM image and chemical mapping images obtained from EDS for the ZrH3%/FeNi thin film. The area marked with a yellow box was used to drift correction and the green box is the mapping region.

Fig. 9. STEM image and STEM/EELS energy shift mapping (ΔeV) for L3-edge of Fe in the rectangular green box. Variations of oxidation state and chemical environment of iron are displayed by the ΔeV color map where differences from the brown color (ΔeV equal 0) represents differences from the standard L3-edge peak position for iron in hematite. The square yellow box was used for drift correction in the STEM/EELS mapping.

Fig. 10. Linear sweep voltammograms of pristine-H, ZrH3% and ZrH3%/FeNi measured in 1.0 mol/L NaOH + 5% H2O2 for ZrH3%/FeNi at scan rate of 10 mV s-1. The solid lines represent the response under AM 1.5G illumination (100 mW cm-2) and the dashed lines under dark conditions.

Fig. 11. (a) Cyclic voltammetry of ZrH3%/FeNi photoanode up to 200 scans from 0.6 to 1.8 V vs. RHE under simulated light conditions (forward scan and 50 mV/s scan rate and light intensity calibrated at 100 mW; (b) Chronoamperometry curve of ZrH3%/FeNi at 1.23 V vs. RHE.

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基于溶液化学策略构建背接触FTO/赤铁矿光阳极界面工程的高效光催化水氧化研究

Solution chemistry back-contact FTO/hematite interface engineering for efficient photocatalytic water oxidation

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