Synergistic Effect of Ni2+ and Fe3+ of Bimetallic Oxyhydroxide NiFeOOH as OER Cocatalyst for Fe2O3 Photoanode with Enhanced Photoelectrochemical Water Splitting

被引：16

作者：

Lin, Yimin ^{[1
]}

Qin, Ai ^{[1
]}

Fang, Wanqing ^{[1
]}

Xv, Rongzi ^{[1
]}

Fu, Li ^{[1
]}

机构：

[1] Fujian Normal Univ, Coll Chem & Mat Sci, Fujian Prov Key Lab Polymer Mat, Fujian Prov Key Lab Adv Mat Oriented Chem Engn, Fuzhou 350007, Fujian, Peoples R China

来源：

ENERGY & FUELS | 2022年 / 36卷 / 05期

基金：

中国国家自然科学基金;

关键词：

BIVO4; PHOTOANODE; OXYGEN EVOLUTION; ALPHA-FE2O3; PERFORMANCE; HYDROXIDE; OXIDATION; NANOSTRUCTURES; NANOPARTICLES; NICKEL; NANOSHEETS;

D O I：

10.1021/acs.energyfuels.1c04113

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

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.

引用

页码：2890 / 2900

页数：11

共 52 条

[1] An Integrating Photoanode of WO3/Fe2O3 Heterojunction Decorated with NiFe-LDH to Improve PEC Water Splitting Efficiency [J].