Effect of Fe2O3 coating on ZnO nanowires in photoelectrochemical water splitting: A synchrotron x-ray spectroscopic and spectromicroscopic investigation
| Autor: | Nobuhiro Kosugi, C.L. Chen, Takuji Ohigashi, Y.C. Huang, J.L. Chen, Han Wei Chang, Y.C. Lin, Y.G. Lin, W.C. Chou, Chun Hong Kuo, Way-Faung Pong, C.L. Dong, Y. F. Wang, Y.R. Lu |
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| Rok vydání: | 2020 |
| Předmět: |
X-ray absorption spectroscopy
Materials science Absorption spectroscopy Renewable Energy Sustainability and the Environment business.industry Nanowire X-ray 02 engineering and technology Electron 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Synchrotron 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention law Optoelectronics Water splitting Charge carrier 0210 nano-technology business |
| Zdroj: | Solar Energy Materials and Solar Cells. 209:110469 |
| ISSN: | 0927-0248 |
| DOI: | 10.1016/j.solmat.2020.110469 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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