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

Velasco-Vélez, JJ, Jones, TE, Streibel, V, Hävecker, M, Chuang, CH, Frevel, L, Plodinec, M, Centeno, A, Zurutuza, A, Wang, R, Arrigo, R ORCID: https://orcid.org/0000-0002-2877-8733, Mom, R, Hofmann, S, Schlögl, R and Knop-Gericke, A 2018, 'Electrochemically active Ir NPs on graphene for OER in acidic aqueous electrolyte investigated by in situ and ex situ spectroscopies' , Surface Science, 681 (Mar 19) , pp. 1-8.

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Abstract

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.

Item Type: Article
Schools: Schools > School of Environment and Life Sciences
Journal or Publication Title: Surface Science
Publisher: Elsevier
ISSN: 0039-6028
Related URLs:
Depositing User: Dr R Arrigo
Date Deposited: 26 Mar 2019 12:34
Last Modified: 26 Mar 2019 12:34
URI: http://usir.salford.ac.uk/id/eprint/50628

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