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论文类型：期刊论文

发表时间：2020-01-31

发表刊物：NANOTECHNOLOGY

收录刊物：PubMed、EI、SCIE

卷号：31

期号：6

页面范围：1V

ISSN号：0957-4484

关键字：core-shell structure; arc discharge method; catalytic reduction; hydrogen evolution reaction; Co@CN nanocomposites

摘要：In this study, we have reported nitrogen-doped graphite C coated Co nanocomposite (Co@CN) catalysts synthesized by one-step arc discharge method. The surface compositions, morphologies and the catalytic properties of the Co@CN nanocomposites were studied minutely. The results reveal that the prepared Co@CN nanocomposites have typical core-shell structure and show highly efficient catalytic performance in a reduction of 4-nitrophenol (4-NP), rhodamine and methylene blue. Their rate constant (K-app) is 0.074 s(?1) in a reduction of 4-NP, which is much higher than that of reported transition metal-based catalysts. Moreover, the overpotential of Co@CN is only 96 mV at a current density of 10 mA cm(?2) in alkaline solution, showing high electrocatalytic activities in the hydrogen evolution reaction. The excellent synergistic effect between nitrogen-doped graphite C shell and magnetic Co core enables the Co@CN nanocomposites catalysts to hold abundant active sites and to transmit rapidly electron ability, resulting in Co@CN nanocomposite catalysts having a highly efficient catalytic nature.