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).