Proceedings of MATSUS Fall 2024 Conference (MATSUSFall24)
DOI: https://doi.org/10.29363/nanoge.matsusfall.2024.236
Publication date: 28th August 2024
The oxygen evolution reaction (OER, 1) is critical for hydrogen production via water electrolysis. However, it has notably sluggish kinetics. It has been proposed that part of the high overpotential required for oxygen formation is due to the spin restrictions necessary for oxygen formation in its fundamental triplet state [1].
4 OH- → O2 + 2 H2O + 4 e- Eº=1.23 V (1)
We investigated how spin alignment can enhance the OER and reduce the competing water oxidation reaction that forms H2O2. Specifically, we explored enhancing the OER by modifying state-of-the-art electrodes with chiral molecules, leveraging the chiral-induced spin selectivity (CISS) effect [2,3]. By comparing the electrocatalytic performance of electrodes modified with different compositions of chiral molecules, we found that the OER enhancement is significantly influenced by the presence of homochiral domains. Furthermore, we confirmed the spin-selectivity effect by observing a reduction in H2O2 formation on mesoporous hybrid systems.[4] Additionally, we studied the impact of static magnetic fields on reaction kinetics and mass transport using key electrocatalysts.[5] Our findings offer a strategy to optimize spin-enhanced OER, which can be easily extended to boost multiple key electrocatalytic reactions that involve spin selective intermediates.
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