Affiliation:
1. College of Electromechanical Engineering Qingdao University of Science and Technology Qingdao Shandong 266061 P. R. China
2. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University Qianjin Street 2699 Changchun Jilin Province 130012 P. R. China
3. Qingdao University Qingdao Shandong 266061 P. R. China
Abstract
AbstractThe heterostructure strategy is currently an effective method for enhancing the catalytic activity of materials. However, the challenge that is how to further improve their catalytic performance, based on the principles of material modification is must addressed. Herein, a strategy is introduced for magnetically regulating the catalytic activity to further enhance the hydrogen evolution reaction (HER) activity for Co0.85Se@CNTs heterostructured catalyst. Building on heterostructure modulation, an external alternating magnetic field (AMF) is introduced to enhance the electronic localization at the active sites, which significantly boosts catalytic performance (71 to 43 mV at 10 mA cm−2). To elucidate the catalytic mechanism, especially under the influence of the AMF, in situ Raman spectroscopy is innovatively applied to monitor the HER process of Co0.85Se@CNTs, comparing conditions with and without the AMF. This study demonstrates that introducing the AMF does not induce a change in the true active site. Importantly, it shows that the Lorentz force generated by the AMF enhances HER activity by promoting water molecule adsorption and O─H bond cleavage, with the Stark tuning rate indicating increased water interaction and bond cleavage efficiency. Theoretical calculations further support that the AMF optimizes energy barriers for key reaction intermediates (steps of *H2O‐TS and *H+*1/2H2).
Funder
National Natural Science Foundation of China
China Postdoctoral Science Foundation
Natural Science Foundation of Shandong Province
Qingdao Postdoctoral Science Foundation
Taishan Scholar Project of Shandong Province