Abstract
As an effective strategy to improve the properties of electrocatalysts, magnetic field-assisted electrocatalytic water splitting has attracted increasing attention recently. However, the corresponding enhancements mostly depend on the exertion of an external magnetic field during electrochemical reactions, which results in a high cost of industrial production, and makes the magnetic field manipulation of electrocatalysis become a challenging task. In this work, instead of the external magnetic field, a bias magnetic field is self-supplied by the remanence state of a ferromagnetic electrocatalyst of FePt. Owing to the assistance of this bias magnetic field, the FePt film in the remanence state shows the overpotential of 229 mV during hydrogen evolution reaction, which is much lower than that in its demagnetization state (283 mV). Our findings demonstrate that the remanence in ferromagnetic electrocatalysts can improve the catalytic performance, which is attributed to the decrease in domain walls.
Graphical abstract
摘要
近期, 作为一种提高电催化性能的有效策略, 磁场辅助下的电催化分解水引起了诸多关注。然而, 相应的性能提升大多需要在电化学反应过程中引入外磁场, 这提高了工业生产时的成本, 也使磁场操控电催化成为了一项具有挑战性的任务。本工作中, 剩磁状态下的铁磁性电催化剂FePt产生的自供给偏置磁场代替了催化反应原本所需的外磁场。在这一偏置磁场的帮助下, 处于剩磁状态的FePt薄膜在析氢反应中的过电势为229 mV, 远低于退磁状态下的测量值 (283 mV) 。我们的研究表明, 铁磁性催化剂中的剩磁可以改善固有的催化性能, 这一提升归因于剩磁状态下畴壁的减少。
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This study was financially supported by the National Natural Science Foundation of China (No. 52101215).
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Hong, H., Liu, DX., Li, J. et al. Enhanced hydrogen evolution reaction in FePt film with remanence due to decrease in domain walls. Rare Met. 43, 1108–1115 (2024). https://doi.org/10.1007/s12598-023-02491-x
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DOI: https://doi.org/10.1007/s12598-023-02491-x