Catalytic oxidation of K₂S via atomic Co and pyridinic N synergy in potassium–sulfur batteries
Date
2021
Authors
Ye, C.
Shan, J.
Chao, D.
Liang, P.
Jiao, Y.
Hao, J.
Gu, Q.
Davey, K.
Wang, H.
Qiao, S.
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Journal article
Citation
Journal of the American Chemical Society, 2021; 143(41):16902-16907
Statement of Responsibility
Chao Ye, Jieqiong Shan, Dongliang Chao, Pei Liang, Yan Jiao, Junnan Hao ... et al.
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Abstract
Potassium–sulfur batteries hold practical promise for next-generation batteries because of their high theoretical gravimetric energy density and low cost. However, significant impediments are the sluggish K2S oxidation kinetics and a lack of atomic-level understanding of K2S oxidation. Here, for the first time, we report the catalytic oxidation of K2S on a sulfur host with Co single atoms immobilized on nitrogen-doped carbon. On the basis of combined spectroscopic characterizations, electrochemical evaluation, and theoretical computations, we show a synergistic effect of dynamic Co–S and N–K interactions to catalyze K2S oxidation. The resultant potassium–sulfur battery exhibited high capacities of 773 and 535 mAh g–1 under high current densities of 1 and 2 C, respectively. These findings provide atomic-scale insights for the rational design of highly efficient sulfur hosts.
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© 2021 American Chemical Society