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    题名: Electrochemically active Ir NPs on graphene for OER in acidic aqueous electrolyte investigated by in situ and ex situ spectroscopies
    作者: Velasco-Vélez, J. J.;Jones, T. E.;Streibel, V.;Hävecker, M.;Chuang, C.-H.;Frevel, L.;Plodinec, M.;Centeno, A.;Zurutuza, A.;Wang, R.;Arrigo, R.;Mom, R.;Hofmann, S.;Schlögl, R.;Knop-Gericke, A.
    关键词: Photoelectron spectroscopy;OER;Ir nanoparticles;Graphene membrane;Aqueous electrolyte
    日期: 2019-03
    上传时间: 2019-05-08 12:10:15 (UTC+8)
    出版者: Elsevier
    摘要: An electrode for the oxygen evolution reaction based on a conductive bi-layered free standing graphene support functionalized with iridium nanoparticles was fabricated and characterized by means of potentiometric and advanced X-ray spectroscopic techniques. It was found that the electrocatalytic activity of iridium nanoparticles is associated to the formation of Ir 5d electron holes. Strong Ir 5d and O 2p hybridization, however, leads to a concomitant increase O 2p hole character, making oxygen electron deficient and susceptible to nucleophilic attack by water. Consequently, more efficient electrocatalysts can be synthesized by increasing the number of electron-holes shared between the metal d and oxygen 2p.
    關聯: Surface Science 681, p.1-8
    DOI: 10.1016/j.susc.2018.10.021
    显示于类别:[物理學系暨研究所] 期刊論文

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