Journal
SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume 209, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.solmat.2020.110469
Keywords
In situ x-ray absorption spectroscopy; Scanning transmission x-ray microscope; PEC water splitting
Funding
- Ministry of Science and Technology of Taiwan [AS-iMATE-109-22, MoST 108-2118-E-032-003-MY3, 107-2112-M-032-004-MY3, 107-2632-M-032-001]
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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.
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