期刊
ACS CATALYSIS
卷 4, 期 6, 页码 2006-2015出版社
AMER CHEMICAL SOC
DOI: 10.1021/cs500372v
关键词
photoelectrocatalysis; water oxidation reaction; alpha-Fe2O3 (hematite); Ti-doped hematite; Zn-doped hematite; solar energy conversion
资金
- Sino-Danish Center for Education and Research (SDC) of NSM at the Shanghai Institute of Applied Physics
- National Natural Science Foundation [51102272, 91127001]
- Foundation of State Key Laboratory of Coal Combustion [FSKLCC1209]
- Faculty of Science and Technology, Aarhus University
The electrodeposition method was used for modification of a nanostructured hematite photoanode with Ti and Zn to improve the photoelectrocatalytic performance of hematite in the water splitting reaction. The photoelectrocatalytic activity of the hematite electrodes modified with Ti4+ and Zn2+ was optimized through the controlled variation of the dopant ion concentration in the electrodeposition solution. Under optimized conditions, for standard illumination of AM 1.5G (100 mW cm(-2)), the photocurrent density at the Ti/Zn-modified hematite anode reached 1.5 mA cm(-2) at 1.23 V vs RHE that was 2.5-times higher than that observed with the pristine hematite electrode, the photoelectrocatalysis onset potential being 63 mV reduced. Effects of Ti and Zn doping on the photoelectrochemical activity of pristine hematite were studied by scanning electron microscopy, UV-vis spectroscopy, elemental analysis, and electrochemical impedance spectroscopy. On the basis of the obtained results, the improved performance of the Ti/Zn-modified hematite stemmed from the combination of the enhanced electrical conductivity along with the facilitated charge transport in the bulk phase and at the surface of hematite. The effect of Zn-doping decreasing the overpotential of the reaction by 218 mV (solely Zn-doped compared to that of the pristine hematite) was correlated with the Zn contribution to the interfacial catalysis of water oxidation.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据