Photoelectron spectroscopy at the graphene-liquid interface reveals the electronic structure of an electrodeposited cobalt/graphene electrocatalyst

Velasco-Vélez, JJ, Pfeifer, V, Hävecker, M, Weatherup, RS, Arrigo, R ORCID: https://orcid.org/0000-0002-2877-8733, Chuang, C-H, Stotz, E, Weinberg, G, Salmeron, M, Schlögl, R and Knop-Gericke, A 2015, 'Photoelectron spectroscopy at the graphene-liquid interface reveals the electronic structure of an electrodeposited cobalt/graphene electrocatalyst' , Angewandte Chemie International Edition, 54 (48) , pp. 14554-14558.

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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 Co3+ to Co2+, which is believed to be the active site of the catalyst.

Item Type: Article
Schools: Schools > School of Environment and Life Sciences > Biomedical Research Centre
Journal or Publication Title: Angewandte Chemie International Edition
Publisher: Wiley
ISSN: 1433-7851
Related URLs:
Depositing User: Dr R Arrigo
Date Deposited: 04 Dec 2018 12:01
Last Modified: 04 Dec 2018 12:11
URI: http://usir.salford.ac.uk/id/eprint/49154

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