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Highly Dispersed Cobalt Nanoparticles Embedded in Nitrogen-Doped Graphitized Carbon for Fast and Durable Potassium Storage

Xiaodong Shi Zhenming Xu Cheng Han Runze Shi Xianwen Wu Bingan Lu Jiang Zhou Shuquan Liang

纳微快报（英文）2021，Vol.13Issue(2)：1-12,12.

Highly Dispersed Cobalt Nanoparticles Embedded in Nitrogen-Doped Graphitized Carbon for Fast and Durable Potassium Storage

Highly Dispersed Cobalt Nanoparticles Embedded in Nitrogen?Doped Graphitized Carbon for Fast and Durable Potassium Storage

Xiaodong Shi ¹Zhenming Xu ²Cheng Han ³Runze Shi ¹Xianwen Wu ¹Bingan Lu ⁴Jiang Zhou ⁵Shuquan Liang¹

作者信息

1. School of Materials Science and Engineering, Central South University, Changsha 410083, People's Republic of China
2. University of Michigan-Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
3. Harvard John. A. Paulson School of Engineering and Applied Sciences, Harvard University, 29 Oxford Street, Cambridge, MA 02138, USA
4. School of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, People's Republic of China
5. School of Physics and Electronics, State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, People's Republic of China
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摘要

Abstract

Potassium-ion batteries (KIBs) have great potential for applications in large-scale energy storage devices. However, the larger radius of K+ leads to sluggish kinetics and inferior cycling performance, severely restricting its practical applicability. Herein, we propose a rational strategy involving a Prussian blue analogue-derived graphitized carbon anode with fast and durable potassium storage capability, which is constructed by encapsulating cobalt nanoparticles in nitrogen-doped graphitized carbon (Co-NC). Both experimental and theoretical results show that N-doping effectively promotes the uniform dispersion of cobalt nanoparticles in the carbon matrix through Co–N bonds. Moreover, the cobalt nanoparticles and strong Co–N bonds synergistically form a three-dimensional conductive network, increase the number of adsorption sites, and reduce the diffusion energy barrier, thereby facilitating the adsorp-tion and the diffusion kinetics. These multiple effects lead to enhanced reversible capacities of 305 and 208.6 mAh g?1 after 100 and 300 cycles at 0.05 and 0.1 A g?1, respectively, demonstrating the applicability of the Co-NC anode for KIBs.

关键词

Cobalt nanoparticles/Nitrogen-doped graphitized carbon/Co–N bonds/Cycling stability/Potassium-ion batteries

Key words

Cobalt nanoparticles/Nitrogen-doped graphitized carbon/Co–N bonds/Cycling stability/Potassium-ion batteries

引用本文复制引用

Xiaodong Shi,Zhenming Xu,Cheng Han,Runze Shi,Xianwen Wu,Bingan Lu,Jiang Zhou,Shuquan Liang..Highly Dispersed Cobalt Nanoparticles Embedded in Nitrogen-Doped Graphitized Carbon for Fast and Durable Potassium Storage[J].纳微快报（英文）,2021,13(2):1-12,12.

基金项目

This work is supported by National Natural Science Foundation of China (Grant No. 51932011, 51802356), Innovation-Driven Project of Central South University (No. 2020CX024), the Research Support Fund of the Collaborative Innovation Center of Manganese-Zinc-Vanadium Industrial Tech-nology in Hunan Province (No. 201809), the Program of Youth Tal-ent Support for Hunan Province (2018RS3098), Hunan Provincial Innovation Foundation for Postgraduate (Grant No. CX2017B045) and the Fundamental Research Funds for the Central Universities of Central South University (Grant No. 2020zzts075). （Grant No. 51932011, 51802356）

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