Overall water splitting efficiency is retarded by the kinetics of the sluggish oxygen evolution reaction (OER). Recently, increasing attention has been attracted to the spin-sensitive nature of the OER and the utility of magnetic fields (MF) for enhancing catalytic performance. Actually, MF should have performed even better, if we had a correct and comprehensive understanding of its possible effects on the whole OER system. Herein, we comprehensively discuss all possible effects of MF on the OER, including the magnetohydrodynamic effect in the electrolyte, the spin selectivity effect in the interface, and the spin alignment and magnetothermal effects in electrocatalysts. We point out that the MF type/setup and the magnetism of electrocatalysts are the two primary determinants for the real effectiveness of MF. This perspective is expected to provide instructive guidance for utilizing magnetic fields to improve the performance of water splitting as well as other spin-sensitive energy conversion reactions.

缓慢的析氧反应 (OER) 的动力学阻碍了整体水分解效率。最近，OER 的自旋敏感性和磁场 (MF) 用于提高催化性能的效用引起了越来越多的关注。实际上，如果我们对它对整个 OER 系统可能产生的影响有一个正确和全面的了解，MF 应该会表现得更好。在此，我们全面讨论了MF对OER的所有可能影响，包括电解质中的磁流体动力学效应、界面中的自旋选择性效应以及电催化剂中的自旋排列和磁热效应。我们指出，MF 类型/设置和电催化剂的磁性是 MF 真正有效性的两个主要决定因素。