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dc.contributor.authorChang, Han-Weien_US
dc.contributor.authorFu, Yanmingen_US
dc.contributor.authorLee, Wan-Yien_US
dc.contributor.authorLu, Ying-Ruien_US
dc.contributor.authorHuang, Yu-Chengen_US
dc.contributor.authorChen, Jeng-Lungen_US
dc.contributor.authorChen, Chi-Liangen_US
dc.contributor.authorChou, Wu Chingen_US
dc.contributor.authorChen, Jin-Mingen_US
dc.contributor.authorLee, Jyh-Fuen_US
dc.contributor.authorShen, Shaohuaen_US
dc.contributor.authorDong, Chung-Lien_US
dc.date.accessioned2018-08-21T05:53:10Z-
dc.date.available2018-08-21T05:53:10Z-
dc.date.issued2018-02-09en_US
dc.identifier.issn0957-4484en_US
dc.identifier.urihttp://dx.doi.org/10.1088/1361-6528/aa9d75en_US
dc.identifier.urihttp://hdl.handle.net/11536/144345-
dc.description.abstractThe photoelectrochemical (PEC) water splitting activity of Nb and Ta-doped hematite (alpha-Fe2O3) nanorods was investigated with reference to electronic structures by in situ synchrotron x-ray absorption spectroscopy (XAS). Current density-potential measurements demonstrate that the PEC activity of alpha-Fe2O3 nanorods depends strongly on the species and concentrations of dopants. The doping of alpha-Fe2O3 nanorods with a low level of Nb or Ta can improve their electrical conductivity and thereby facilitate charge transport and reduced electron-hole recombination therein. The photoconversion effects of Nb and Ta-doped alpha-Fe2O3 by in situ XAS in the dark and under illumination revealed opposite evolutions of the spectral intensities of the Fe L-edge and Nb/Ta L-edge, indicating that charge transfer and a conduction pathway are involved in the photoconversion. Analytic in situ XAS results reveal that the alpha-Fe2O3 that is doped with a low level of Nb has a greater photoconversion efficiency than that doped with Ta because Nb sites are more active than Ta sites in alpha-Fe2O3. The correlation between PEC activity and the electronic structure of Nb/Ta-doped alpha-Fe2O3 is examined in detail using in situ XAS and helps to elucidate the mechanism of PEC water splitting in terms of the electronic structure.en_US
dc.language.isoen_USen_US
dc.subjectx-ray absorption spectroscopyen_US
dc.subjectphotoelectrochemical water splittingen_US
dc.subjectelectronic structureen_US
dc.subjectalpha-Fe2O3en_US
dc.titleVisible light-induced electronic structure modulation of Nb- and Ta-doped alpha-Fe2O3 nanorods for effective photoelectrochemical water splittingen_US
dc.typeArticleen_US
dc.identifier.doi10.1088/1361-6528/aa9d75en_US
dc.identifier.journalNANOTECHNOLOGYen_US
dc.citation.volume29en_US
dc.contributor.department加速器光源科技與應用學位學程zh_TW
dc.contributor.department電子物理學系zh_TW
dc.contributor.departmentMaster and Ph.D. Program for Science and Technology of Accelrrator Light Sourceen_US
dc.contributor.departmentDepartment of Electrophysicsen_US
dc.identifier.wosnumberWOS:000419628900002en_US
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