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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/120501

    Title: Effect of Fe2O3 coating on ZnO nanowires in photoelectrochemical water splitting: A synchrotron x-ray spectroscopic and spectromicroscopic investigation
    Authors: 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.
    Keywords: In situ x-ray absorption spectroscopy;Scanning transmission x-ray microscope;PEC water splitting
    Date: 2020-06
    Issue Date: 2021-04-15 12:11:54 (UTC+8)
    Abstract: 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.
    Relation: Solar Energy Materials and Solar Cells 209, 110469
    DOI: 10.1016/j.solmat.2020.110469
    Appears in Collections:[Graduate Institute & Department of Physics] Journal Article

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