Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.195
Publication date: 7th February 2022
A carbon-neutral and sustainable future requires advanced electrocatalysis systems[1]. Magnetism-induced enhancement of electrocatalytic reactions has been gaining increasing attention [2],[3],[4]. A simple and efficient way to achieve an enhancement is to apply an external magnetic field to the reaction[5]. Various mechanisms concerning different aspects of the reactions, e.g., reaction kinetics[5],[6] and mass transfer processes[7], have been introduced. However, the enhancement is likely a result of a synergistic effect of at least two mechanisms. Here, using key electrocatalytic reactions, i.e., oxygen evolution reaction (OER), oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER), and homogeneous magnetic fields provided by an electromagnet, we demonstrate the importance of experimentally decoupling the mechanisms affecting the electrocatalytic reactions at electrodes with different magnetic properties. Our results show that the effect on the reaction kinetics and selectivity is exclusive to ferromagnetic catalysts and electron spin-dependent reactions under sufficient magnetic field strength; however, an enhancement of the mass transfer is universal. We provide a versatile strategy to optimize the magnetic enhancement that can be implemented to boost electrocatalytic reactions.
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