石墨烯
X射线光电子能谱
钴
电催化剂
材料科学
催化作用
化学工程
电子结构
纳米技术
化学
电极
电化学
物理化学
有机化学
计算化学
工程类
冶金
作者
Juan‐Jesús Velasco‐Vélez,Verena Streibel,Michael Hävecker,Robert S. Weatherup,Rosa Arrigo,Cheng‐Hao Chuang,Eugen Stotz,Gisela Weinberg,Miquel Salmerón,Robert Schlögl,Axel Knop‐Gericke
标识
DOI:10.1002/anie.201506044
摘要
Abstract Electrochemically grown cobalt on graphene exhibits exceptional performance as a catalyst for the oxygen evolution reaction (OER) and provides the possibility of controlling the morphology and the chemical properties during deposition. However, the detailed atomic structure of this hybrid material is not well understood. To elucidate the Co/graphene electronic structure, we have developed a flow cell closed by a graphene membrane that provides electronic and chemical information on the active surfaces under atmospheric pressure and in the presence of liquids by means of X‐ray photoelectron spectroscopy (XPS). We found that cobalt is anchored on graphene via carbonyl‐like species, namely Co(CO) x , promoting the reduction of Co 3+ to Co 2+ , which is believed to be the active site of the catalyst.
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