Alternating Magnetic Field Induced Magnetic Heating in Ferromagnetic Cobalt Single-Atom Catalysts for Efficient Oxygen Evolution Reaction,Nano Letters

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Alternating Magnetic Field Induced Magnetic Heating in Ferromagnetic Cobalt Single-Atom Catalysts for Efficient Oxygen Evolution Reaction
Nano Letters ( IF 9.6 ) Pub Date : 2022-11-21 , DOI: 10.1021/acs.nanolett.2c03359
Xunguo Gong ₁ , Zhenzhen Jiang ₁ , Wei Zeng ₁ , Ce Hu ₁ , Xingfang Luo ₁ , Wen Lei ₂ , Cailei Yuan ₁

Affiliation

Alternating magnetic field (AMF) is a promising methodology for further improving magnetic single-atom catalyst (SAC) activity toward oxygen evolution reaction (OER). Herein, the anchoring of Co single atoms on MoS₂ support (Co@MoS₂), leading to the appearance of in-plane room-temperature ferromagnetic properties, is favorable for the parallel spin arrangement of oxygen atoms when a magnetic field is applied. Moreover, field-assisted electrocatalytic experiments confirmed that the spin direction of Co@MoS₂ is changing with the applied magnetic field. On this basis, under AMF, the active sites in ferromagnetic Co@MoS₂ were heated by exploiting the magnetic heating generated from spin polarization flip of these SACs to further expedite OER efficiency, with overpotential at 10 mA cm^–2 reduced from 317 mV to 250 mV. This work introduces a feasible and efficient approach to enhance the OER performance of Co@MoS₂ by AMF, shedding some light on the further development of magnetic SACs for energy conversion.

中文翻译：

用于高效析氧反应的铁磁钴单原子催化剂中的交变磁场感应磁加热

交变磁场 (AMF) 是一种很有前途的方法，可进一步提高磁性单原子催化剂 (SAC) 对析氧反应 (OER) 的活性。在此，Co单原子锚定在MoS ₂载体上（Co@MoS ₂），导致面内室温铁磁特性的出现，有利于在施加磁场时氧原子的平行自旋排列。此外，场辅助电催化实验证实，Co@MoS ₂的自旋方向随着施加的磁场而变化。在此基础上，在 AMF 下，铁磁性 Co@MoS _{2中的活性位点}通过利用这些 SAC 的自旋极化翻转产生的磁热来加热，以进一步提高 OER 效率，10 mA cm ^–2时的过电势从 317 mV 降低到 250 mV。_{这项工作介绍了一种通过 AMF 提高 Co@MoS 2}的 OER 性能的可行且有效的方法，为用于能量转换的磁性 SAC 的进一步发展提供了一些启示。

更新日期：2022-11-21

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