Electrochemically active Ir NPs on graphene for OER in acidic aqueous electrolyte investigated by in situ and ex situ spectroscopies

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題名:	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.
關鍵詞:	Photoelectron spectroscopy;OER;Ir nanoparticles;Graphene membrane;Aqueous electrolyte
日期:	2019-03
上傳時間:	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
顯示於類別:	[電機工程學系暨研究所] 期刊論文

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