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Highly efficient cobalt nanoparticles anchored porous N-doped carbon nanosheets electrocatalysts for Li-O2 batteries

Zhai, Yanjie, Wang, Jun, Gao, Qiang, Fan, Yuqi, Hou, Chuanxin, Hou, Yue, Liu, Hu, Shao, Qian, Wu, Shide, Zhao, Lanling, Ding, Tao, Dang, Feng, Guo, Zhanhu
Journal of catalysis 2019 v.377 pp. 534-542
binding capacity, carbon, catalysts, catalytic activity, cathodes, cobalt, electrochemistry, lithium batteries, models, nanoparticles, nanosheets, pyrolysis
Cobalt (Co) nanoparticles anchored porous N-doped carbon nanosheets (Co@PNCS) were fabricated using a facile one-pot pyrolysis route and tested as high-performance cathode catalysts for Li-O2 batteries. The hierarchical structure was made of cobalt nanoparticles distributed in the crumpled porous carbon nanosheets. Uniformly distributed and exposed cobalt nanoparticles in the PNCS exhibited a higher electrocatalytic activity compared to Co nanoparticles anchored nitrogen-carbon materials (Co-N-C). Density function theory (DFT) calculations based on the interfacial model demonstrated that the active Co sites exhibited a more stable binding ability to discharge Li2O2 products than that of the active N sites, and Li2O2 could be reversibly formed and decomposed during cycling. Owing to optimal loadings of Co nanoparticles (16.03 wt%), the Co@PNCS-2 cathode exhibited a high specific capacity of 11,329 mAh g−1 and extended cycling life of 120 cycles, highlighting the great potential as cathode catalysts for Li-O2 batteries.