Edge Coordination of Ni Single Atoms on Hard Carbon Promotes the Potassium Storage and Reversibility |
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Authors: | Yuwen Chen Ning Fu Bingxin Shen Yurong Yan Wei Shao Tiantian Wang Haijiao Xie Zhenglong Yang |
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Affiliation: | 1. Shanghai Key Laboratory of D & A for Metal-Functional Materials, School of Materials Science and Engineering, Tongji University, Shanghai, 200092 P. R. China;2. School of Chemical and Environmental Engineering, Anyang Institute of Technology, Anyang, 455000 P. R. China;3. Hangzhou Yanqu Information Technology Co., Ltd., Hangzhou, 310003 P. R. China |
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Abstract: | Hard carbon is the most promising anode for potassium-ion batteries (PIBs) due to its low cost and abundance, but its limited storage capacity remains a major challenge. Herein, edge coordination of metal single atoms is proved to be an effective strategy for promoting potassium storage in hard carbon for the first time, taking B, N co-doped hard carbon nanotubes anchored by edge Ni-N4-B atomic sites (Ni@BNHC) as an example. It is revealed that edge Ni-N4-B can provide active sites for interlayer adsorption of K+ and that Ni atoms can facilitate the reversibility of K+ storage on N and B atoms. Furthermore, an unprecedentedly reversible K+ storage capacity of 694 mAh g−1 at 0.05 A g−1 is realized by introducing commercial carbon nanotubes. This work provides a new perspective for the application of single-atom engineering and the design of high-performance carbon anodes for PIBs. |
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Keywords: | atomic coordination chemistry hard carbon potassium ion batteries reversibility single atoms |
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