标题: Effect of Fe2O3 coating on ZnO nanowires in photoelectrochemical water splitting: A synchrotron x-ray spectroscopic and spectromicroscopic investigation
作者: Lu, Y. R.
Wang, Y. F.
Chang, H. W.
Huang, Y. C.
Chen, J. L.
Chen, C. L.
Lin, Y. C.
Lin, Y. G.
Pong, W. F.
Ohigashi, T.
Kosugi, N.
Kuo, C. H.
Chou, W. C.
Dong, C. L.
电子物理学系
Department of Electrophysics
关键字: In situ x-ray absorption spectroscopy;Scanning transmission x-ray microscope;PEC water splitting
公开日期: 1-六月-2020
摘要: An array of ZnO/Fe2O3 core-shell nanowires (NW) for the highly efficient absorption of light and carrier collection is developed for use in photoelectrochemical (PEC) water-splitting. The oriented NW architecture favors physical matching, providing a direct electron conduction pathway and reducing the diffusion length of photogenerated holes. This work involves a combination of spectral imaging, spectromicroscopy and in situ x-ray absorption spectroscopy; spectra are obtained under operando conditions. Direct investigation of oriented nanowires using polarization-dependent x-ray spectromicroscopy enables the determination of the relationship between anisotropic electronic orbitals and charge carrier water-splitting efficiency. The results of O K-edge STXM demonstrated that the ZnO/Fe2O3 core-shell NW exhibits strong anisotropy and thus provides higher electron-hole transport efficiency than bare ZnO. In situ XAS revealed that interfacial charge transfer between Fe 3d and Zn 4p states enhances the photoelectrochemical reaction in the ZnO/Fe2O3 core-shell NW. The photogenerated electrons of Fe2O3 are transferred from Fe 3d states to the Zn 4p state under photoelectrochemical conditions.
URI: http://dx.doi.org/10.1016/j.solmat.2020.110469
http://hdl.handle.net/11536/154383
ISSN: 0927-0248
DOI: 10.1016/j.solmat.2020.110469
期刊: SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume: 209
起始页: 0
结束页: 0
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