Journal
NANO LETTERS
Volume 22, Issue 23, Pages 9411-9417Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.2c03359
Keywords
alternating magnetic field; ferromagnetism; magnetic heating effect; single-atom catalysts
Categories
Funding
- National Natural Science Foundation of China
- Project of Academic and Technological Leaders in Jiangxi Province
- [52171213]
- [51871115]
- [52061017]
- [12204203]
- [20204BCJ22036]
- [20213BCJ22010]
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This study demonstrates a method to enhance the activity of magnetic single-atom catalysts (SACs) for oxygen evolution reaction (OER) using alternating magnetic field (AMF). By anchoring cobalt single atoms on a MoS2 support, Co@MoS2 composite materials with in-plane ferromagnetic properties are obtained, allowing parallel spin arrangements of oxygen atoms under a magnetic field. Heating the active sites in Co@MoS2 using AMF further improves the OER efficiency.
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.
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