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 |
显示于类别: | Articles |