Abstract
Co-based materials with optimized adsorption energy of reaction intermediates have become the promising electrocatalyst for enhanced oxygen reduction reaction (ORR). Here, B, N-doped carbon nanosheets embedded with Co nanoparticles are reported by a simple wet chemical method and further pyrolysis process. The average size of Co nanoparticles is 10.03 ± 1.6 nm. X-ray photoelectron spectroscopy and electrochemical measurements show that those doped with B enrich active sites of the catalyst with highly active B-C bond and provide greater electrochemical surface area for ORR. The material shows impressive ORR performance with a positive half-wave potential of 0.87 V and a superior limiting current density of 6.88 mA cm−2 outperforming commercial Pt/C in alkaline solution. Noticeably, the optimized electron structure of Co–N species significantly weakens the Co–O bond and adsorption energy of OOH*, which could promote the occurrence of close to the four-electron ORR process. This work, besides showing electrocatalysts with excellent ORR performance, provided an approach for optimizing catalytic activity of Co-based materials.
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Funding
This work was supported by the National Science Foundation of China (Grant Number 91745112) and the Science and Technology Commission of Shanghai Municipality (21ZR1425000, 19DZ2271100).
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Xiaohan Sun, Xiaoguo Tie, Yurui Zhang, and Zhengwei Zhao. The first draft of the manuscript was written by Xiaohan Sun and all authors commented on previous versions of the manuscript. Qiaoxia Li, Yulin Min, and Qunjie Xu had responsibility for the design of the whole experiments, the results of discussion and analysis, and the submission of the journal. All authors read and approved the final manuscript.
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Sun, X., Tie, X., Zhang, Y. et al. B, N-doped carbon nanosheets embedded with Co nanoparticles for enhanced oxygen reduction reaction. J Nanopart Res 24, 97 (2022). https://doi.org/10.1007/s11051-022-05409-3
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DOI: https://doi.org/10.1007/s11051-022-05409-3