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    题名: Visible light-induced electronic structure modulation of Nb- and Ta-doped α-Fe2O3 nanorods for effective photoelectrochemical water splitting
    作者: Han-Wei Chang;Yanming Fu;Wan-Yi Lee;Ying-Rui Lu;Yu-Cheng Huang;Jeng-Lung Chen;Chi-Liang Chen;Wu Ching Chou;Jin-Ming Chen;Jyh-Fu Lee
    日期: 2018-01-08
    上传时间: 2018-06-09 12:10:16 (UTC+8)
    摘要: The photoelectrochemical (PEC) water splitting activity of Nb and Ta-doped hematite (α-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 α-Fe2O3 nanorods depends strongly on the species and concentrations of dopants. The doping of α-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 α-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 α-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 α-Fe2O3. The correlation between PEC activity and the electronic structure of Nb/Ta-doped α-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.
    關聯: Nanotechnology 29(6),064002(8 pages)
    DOI: 10.1088/1361-6528/aa9d75
    显示于类别:[物理學系暨研究所] 期刊論文


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