Engineering the interface and surface structures of semiconductor-based photoelectrodes for improved charge transfer dynamics and promoted water redox reaction kinetics is essential to achieve efficient photoelectrochemical (PEC) water splitting. In this work, α-Fe2O3 nanorods, successively coated with TiO2 and CoOx thin layers, were reported as the photoanode for solar-driven water oxidation. The obtained α-Fe2O3/TiO2/CoOx photoanode exhibits superior PEC performance as compared to bare α-Fe2O3, with a 3.3-time improvement in photocurrent density at 1.23 V vs reversible hydrogen electrode. This significant enhancement results from the formed heterojunction between α-Fe2O3 and TiO2 for the accelerated photogenerated charge separation and transfer as well as the passivated surface defects by the TiO2 overlayer for reduced charge recombination. Additionally, the existence of CoOx as the oxygen evolution catalyst significantly facilitates the surface reaction kinetics and thus reduces the overpotential for water oxidation. This study demonstrates a collaborative strategy of interface and surface engineering to design novel structures of α-Fe2O3 based photoanodes for highly efficient solar water oxidation.
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28 June 2020
Research Article|
June 25 2020
Interface and surface engineering of hematite photoanode for efficient solar water oxidation
Special Collection:
Photocatalysis and Photoelectrochemistry
Xiangyan Chen;
Xiangyan Chen
1
International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University
, Xi’an, Shaanxi 710049, China
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Yanming Fu;
Yanming Fu
1
International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University
, Xi’an, Shaanxi 710049, China
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Liu Hong;
Liu Hong
2
National Key Lab of Science and Technology on LRE, Xi’an Aerospace Propulsion Institute
, Xi’an, Shaanxi 710100, China
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Tingting Kong;
Tingting Kong
3
College of Chemistry and Chemical Engineering, Xi’an Shiyou University
, Xi’an, Shaanxi 710054, China
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Xiaobo Shi;
Xiaobo Shi
2
National Key Lab of Science and Technology on LRE, Xi’an Aerospace Propulsion Institute
, Xi’an, Shaanxi 710100, China
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Guangxu Wang;
Guangxu Wang
2
National Key Lab of Science and Technology on LRE, Xi’an Aerospace Propulsion Institute
, Xi’an, Shaanxi 710100, China
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Le Qu;
Le Qu
3
College of Chemistry and Chemical Engineering, Xi’an Shiyou University
, Xi’an, Shaanxi 710054, China
4
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology
, Chengdu, Sichuan 610059, China
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Shaohua Shen
Shaohua Shen
a)
1
International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University
, Xi’an, Shaanxi 710049, China
a)Author to whom correspondence should be addressed: shshen_xjtu@mail.xjtu.edu.cn
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a)Author to whom correspondence should be addressed: shshen_xjtu@mail.xjtu.edu.cn
Note: This paper is part of the JCP Special Topic on Photocatalysis and Photoelectrochemistry.
J. Chem. Phys. 152, 244707 (2020)
Article history
Received:
March 27 2020
Accepted:
June 05 2020
Citation
Xiangyan Chen, Yanming Fu, Liu Hong, Tingting Kong, Xiaobo Shi, Guangxu Wang, Le Qu, Shaohua Shen; Interface and surface engineering of hematite photoanode for efficient solar water oxidation. J. Chem. Phys. 28 June 2020; 152 (24): 244707. https://doi.org/10.1063/5.0009072
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