Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.182
Publication date: 18th December 2023
Electrocatalysis, whose reaction venue locates at the electrode-electrolyte interface, is controlled by electron transfer across the electric double layer, envisaging a mechanistic link between the electrocatalytic property and the EDL structure. One of the most intriguing questions is the mechanistic role of the alkali metal cation at the electrode-electrolyte interface, often referred to as the “cation effect”. In this presentation, we show that the identity of the alkali metal cation not only influences catalytic activity and selectivity, but can also directly affect electrode stability using an online inductively coupled plasma mass spectrometer coupled to an electrochemical flow cell. An increasing amount of Pt dissolution during cyclic voltammetry was found as the atomic number of alkali metal cations decreased. To explain this observation, various control experiments and computational studies were performed to explore potential scenarios such as changes in oxophilicity, electric field strength, and ion pairing. With a comprehensive understanding of alkali metal identity-dependent Pt dissolution, we propose a conceptual strategy for better electrocatalysis with prolonged catalytic durability.
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