期刊
ENERGY & FUELS
卷 36, 期 5, 页码 2890-2900出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.energyfuels.1c04113
关键词
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资金
- National Natural Science Foundation of China [21805040/B0605]
- Quangang Petrochemical Research Institute of Fujian Normal University Special Fund Project [2019YJY01]
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences
This study demonstrates the optimization of alpha-Fe2O3 nanoparticles modified by bimetallic oxyhydroxide NiFeOOH layers for photoelectrochemical hydrogen production. The optimized alpha-Fe2O3/NiFeOOH photoanode exhibits significantly enhanced photocurrent density and photon-to-current efficiency compared to bare alpha-Fe2O3 photoanodes. The synergistic effect of Ni2+ and Fe3+ in the NiFeOOH cocatalyst contributes to the improved efficiency of electron/hole separation and injection in the alpha-Fe2O3/NiFeOOH photoanode.
Hydrogen production via photoelectrochemical water splitting represents one of the sustainable development approaches for future energy. Herein, we demonstrate the fabrication optimization of alpha-Fe2O3 nanoparticles modified by bimetallic oxyhydroxide NiFeOOH layers. The optimized alpha-Fe2O3/NiFeOOH photoanode is successfully applied for the photoelectrochemical hydrogen production process. The electrodeposition and annealing process of the alpha-Fe2O3 nanoparticles are optimized for better photoelectrochemical performance. NiFeOOH layers are subsequently deposited on the surface of the optimized alpha-Fe2O3 photoanode by the impregnation process. The physical and chemical characterization results show that bimetallic oxyhydroxide NiFeOOH layers are modified on the surface of the alpha-Fe2O3 nanoparticles with an amorphous form. After optimization, a highly enhanced photocurrent density is achieved in the optimized alpha-Fe2O3 photoanode with a value of 0.96 mA/cm(2), which is 50-fold higher than that of the bare alpha-Fe2O3 photoanode (0.019 mA/cm(2)). After NiFeOOH layers were deposited, the photocurrent density of the alpha-Fe2O3/NiFeOOH photoanode is enhanced to 1.35 mA/cm(2) (measured at 1.23 V versus RHE), 1.53-fold and 80-fold higher than those of the optimized alpha-Fe2O3 and bare alpha-Fe2O3 photoanodes, respectively. In addition, the alpha-Fe2O3/NiFeOOH photoanode yields an improved applied bias photon-to-current efficiency of 0.13% (measured at 1.05 V versus RHE), 1.65 times higher than that of the optimized alpha-Fe2O3 photoanode. Photoelectrochemical and electrochemical characterization confirms that the synergistic effect of Ni2+ and Fe3+ of the NiFeOOH cocatalyst on accelerating the consumption of holes and promoting the surface OER dynamics could improve the efficiency of electron/hole separation and injection in the alpha-Fe2O3/NiFeOOH photoanode. Therefore, the PEC properties of the alpha-Fe2O3 photoanode are significantly improved.
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