Spectroelectrochemical analysis of the water oxidation mechanisms on metal oxide electrocatalysts
Camilo A. Mesa a b, James R. Durrant b, Sixto Gimenez a
a Universitat Jaume I, Institute of Advanced Materials (INAM) - Spain, Avinguda de Vicent Sos Baynat, Castelló de la Plana, Spain
b Molecular Sciences Research Hub and Centre for Processable Electronics, Imperial College London, Londres W12 0BZ, Reino Unido, United Kingdom
Proceedings of International Conference on Electrocatalysis for Energy Applications and Sustainable Chemicals (EcoCat)
Online, Spain, 2020 November 23rd - 25th
Organizers: Ward van der Stam, Marta Costa Figueiredo, Sixto Gimenez Julia, Núria López and Bastian Mei
Poster, Camilo A. Mesa, 026
Publication date: 6th November 2020

Electrocatalytic water splitting is considered a promising technology to store renewable energy into chemical bonds (e.g., hydrogen). In this process, the oxygen evolution reaction (OER) water acts as electron donor and it is considered to be the bottleneck of the process when using metal-oxide (photo)anodes. The efficiency of these catalysts does not only depend on the nature of the metal oxide, but also on their physical characteristics such as thickness and porosity and doping variations, amongst others. However, the mechanism of the OER on metal oxides as well as the nature of the efficiency loses remains elusive.

In this talk, I will present recent advances on the understanding of the kinetics of OER on different metal-oxide electrocatalysts, focusing particularly on Ni-based anodes. A mechanistic analysis of the OER on Ni-based electrocatalysts will be presented by the study of the water oxidation rate law under different physicochemical conditions, Fe incorporation [1,2] and when combined with a photoelectrode for solar-driven fuel synthesis.

 

C.A.M. thanks the Colombian Science Ministry (former COLCIENCIAS, call 568) and the University Jaume I for funding. J.R.D. and C.A.M. acknowledge the EU (732840 ALEAF) and J.R.D. additionally thanks EPSRC for funding. S. G. acknowledges financial support from Ministerio de Ciencia, Innovación y Universidades of Spain (project ENE2017-85087-C3-1-R). 

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