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Amorphous cobalt hydroxysulfide nanosheets with regulated electronic structure for high-performance electrochemical energy storage

具有可调电子结构的无定型羟基硫化钴纳米片用 于高性能电化学储能

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Abstract

Pseudocapacitors with high power density, long-term durability, as well as reliable safety, play a key role in energy conversion and storage. Designing electrode materials combing the features of high specific capacitance, excellent rate performance, and outstanding mechanical stability is still a challenge. Herein, a facile partial sulfurization strategy has been developed to modulate the electronic structure and crystalline texture of cobalt hydroxide nanosheets (denoted as Co(OH)2) at room temperature. The resultant cobalt hydroxysulfide nanosheet (denoted as CoSOH) electrode with abundant low-valence cobalt species and amorphous structure, exhibits a high specific capacitance of 2110 F g−1 at 1 A g−1 with an excellent capability retention rate of 92.1% at 10 A g−1, which is much larger than that of Co(OH)2 precursor (916 F g−1 at 1 A g−1 and 80% retention at 10 A g−1). Furthermore, the fabricated asymmetric supercapacitor device con structed with CoSOH and active carbon displays a considerable high energy density of 44.9 W h kg−1 at a power density of 400 W kg−1, and exceptional stability after 8000 cycles.

摘要

赝电容超级电容器具有高功率密度、超长寿命以及可靠的 安全性, 使其在能源转化和存储中扮演着重要角色. 但是, 设计具有 高容量、优异倍率性能以及出色的机械稳定性的电极材料依旧是 一个挑战. 本工作中, 我们采用室温部分硫化策略来调节氢氧化钴 纳米片的电子结构和晶态. 得到的羟基硫化钴具有无定形结构, 同 时还有丰富的低价钴离子. 三电极体系下, 该电极在电流密度为 1 A g−1时的比电容达2110 F g−1, 当电流密度增大至10 A g−1时容量 仍有92.1%的保留, 容量和倍率性能都远高于氢氧化钴前驱体 (916 F g−1 @1 A g−1, 10 A g−1的比电容保留率为80%). 此外, 利用该 电极与商业活性炭组成的不对称电容器具有44.9 W h kg−1的高能 量密度以及优异的稳定性(8000次循环后仅衰减4%).

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Acknowledgements

This work was surpported by the National Natural Science Foundation of China (21902108, 21975163 and 51902204) and China Postdoctoral Science Foundation (2019M663035). The authors thank the Instrumental Analysis Center of Shenzhen University (Xili Campus) for the help in TEM characterization and analysis. The authors gratefully acknowledge Shiyanjia lab (www.shiyanjia.com) for the XPS test.

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Authors and Affiliations

  1. College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518060, China

    Kun Xiang  (项坤), Xuewan Wang  (王学万), Jing-Li Luo  (骆静利) & Xian-Zhu Fu  (符显珠)

  2. Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China

    Kun Xiang  (项坤)

  3. Ceramic Research Institute of Light Industry of China, Jingdezhen, 333000, China

    Wen You  (游雯)

  4. Henan Institutes of Advanced Technology, Zhengzhou University, Zhengzhou, 450003, China

    Zhikun Peng  (彭智昆)

  5. Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, T6G 1H9, Canada

    Jing-Li Luo  (骆静利)

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  1. Kun Xiang  (项坤)
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  2. Xuewan Wang  (王学万)
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  3. Wen You  (游雯)
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  4. Zhikun Peng  (彭智昆)
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  6. Xian-Zhu Fu  (符显珠)
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Contributions

Xiang K conceived the idea. Xiang K and Wang X contributed to the experiments and data analyses. Peng Z conducted the DFT calculations. The paper was primarily written by Xiang K, You W and Peng Z. The project was supervised by Luo JL and Fu XZ. All authors contributed to the general discussion.

Corresponding author

Correspondence to Xian-Zhu Fu  (符显珠).

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Conflict of interest

The authors declare no conflict of interest.

Supplementary information

Supporting data are available in the online version of the paper.

Kun Xiang received his PhD degree in physical chemistry from Nanjing University in 2018. Then he jointed Shenzhen University as a postdoctoral fellow in 2018. His current research focuses on the design and synthesis of 2D nanomaterials for energy storage and conversion.

Xian-Zhu Fu obtained his PhD degree in 2007 from Xiamen University. He carried out postdoctoral research at the University of Alberta. Now he is a professor in the School of Materials Science and Engineering, Shenzhen University. His research interests are the electrochemistry/electrocatalysts for energy materials and devices, electronic materials and process.

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Amorphous cobalt hydroxysulfide nanosheets with regulated electronic structure for high-performance electrochemical energy storage

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Xiang, K., Wang, X., You, W. et al. Amorphous cobalt hydroxysulfide nanosheets with regulated electronic structure for high-performance electrochemical energy storage. Sci. China Mater. 63, 2303–2313 (2020). https://doi.org/10.1007/s40843-020-1362-1

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