Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.368
Publication date: 18th July 2023
Electrocatalysis has emerged as a promising process to store renewable energy into fuels and high added-value chemicals to decarbonise the energy and fine chemical sectors. As such, the water splitting process to generate H2 and O2 is of particular interest, even though both hydrogen and oxygen evolution reactions (HER and OER, respectively) are kinetically challenging, especially when using Earth-abundant metal oxide and chalcogenide catalysts. The efficiency of these catalysts does not only depend on the nature of the metal oxide/chalcogenide, but also on their physical characteristics such as composition, magnetic susceptibility and doping variations, amongst others. However, the reaction mechanism of the HER and OER on metal oxides/chalcogenides as well as the nature of the efficiency loses remains elusive. Obtaining such detailed mechanistic and kinetic knowledge requires the use of operando spectroscopic techniques that can probe the system under operating conditions. In this talk, I will present the characterisation of a Cu2-xS cathode for HER that increases its ECSA as a function of time and a NiFeOx anode for OER that changes its reaction mechanism when a magnetic field is applied to the system.
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