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    jsp.display-item.identifier=請使用永久網址來引用或連結此文件: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/118696

    题名: Ex-situ soft X-ray absorption spectroscopic investigation of NiCo2O4 annealed in different gases for hydrogen generation by electrolysis of urea
    作者: Chang, H. W.;Dong, C. L.;Lu, Y. R.;Huang, Y. C.;Chen, C. L.;Chen, J. L.;Chen, J. M.;Lee, J. F.;Tsai, Y. C.
    关键词: X-ray absorption spectroscopy;NiCo2O4;Electrocatalytic mechanism
    日期: 2019-06-14
    上传时间: 2020-06-01 12:14:08 (UTC+8)
    摘要: Electrochemical and ex-situ X-ray absorption spectroscopic (XAS) measurements of NiCo2O4 that have been annealed in different gases (Ar and air) were made to evaluate the efficiency of its electrocatalysis of hydrogen generation by the electrolysis of urea. The electrochemical and XAS measurements demonstrated that NCO–Ar contain significant amounts of Co2+ in octahedral coordination was more favorable than NCO-air for urea electrolysis owing to the effective exposure of electrochemical active sites to participate in the Faradic redox reaction. Further insight into the electrocatalytic mechanism of NiCo2O4-based materials during urea electrolysis was obtained using ex-situ soft XAS. The results of ex-situ soft XAS revealed that the variation of the octahedral and tetrahedral coordinations of Co2+ in NCO–Ar and NCO-air importantly contributes to electrocatalytic behavior. NCO–Ar exhibits excellent electrocatalytic activity towards the Co redox couples in a repetitive cycling process owing to the creation of highly efficient active sites (octahedral Co2+). This study presents importantly x-ray spectroscopic determination of the change in electronic structure of catalyst for hydrogen production.
    關聯: International Journal of Hydrogen Energy 44(30), p.15771-15778
    DOI: 10.1016/j.ijhydene.2018.10.108
    显示于类别:[物理學系暨研究所] 期刊論文


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