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The influence of S-doped technique on supercapacitor performances for Co(OH)2@nitrogen-doped carbon dots

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Abstract

Recently, Co-based materials have been widely used as a type of supercapacitor. However, Co-based materials are highly restricted due to their low conductivity, poor cyclic performance, and large structural changes during the charge/discharge process. Carbon materials have been found to improve the electrochemistry performance of Co(OH)2. In this work, sulfur doping was used to enhance the electrochemistry performance of Co(OH)2@nitrogen-doped carbon dots (Co(OH)2@NC) via hydrothermal approach. Here, as-prepared S-Co(OH)2@NC shows an excellent specific capacitance of 730 F g−1 at 1 A g−1 (much higher than that of pristine Co(OH)2@NC (592 F g−1 at 1 A g−1)). An asymmetric supercapacitor (ASC) is assembled by S-Co(OH)2@NC (as a positive electrode) and graphene aerogels@NC (as a negative electrode), which presents a specific energy density as high as 39.59 Wh kg−1 with a power density of 639 W kg−1. Moreover, the ACS manifests extraordinary cycle stability (75% capacitance retention after 8500 cycles). In summary, sulfur doping in electrode material has been proven as an efficient approach for improving the electrochemical performance in supercapacitor devices.

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Funding

This work was financially supported by the Major Special Project of Fujian Province (Grant No. 2021HZ027002), Fujian Provincial Science and Technology Plan Project (Grant No. 2021H4004), Fuzhou Science and Technology Plan Project (Grant NO. 2021-ZD-285), and Quanzhou Municipal Science and Technology Plan Project (Grant No. 2021C002R).

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  1. College of Materials Science and Engineering, Fuzhou University, Fuzhou, 350116, People’s Republic of China

    Fanyi Lin, Xiansheng Hong, Zihan Chen & Yuying Zheng

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  1. Fanyi Lin
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  2. Xiansheng Hong
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  3. Zihan Chen
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FanYi Lin wrote the main manuscript text. FanYi Lin and Zihan Chen designed this study and detailed experiments. FanYi Lin and Xiansheng Hong carried out the experiment work and collected the experimental results. Xiansheng Hong and Yuying Zheng revised the article. Yuying Zheng provided financial support for this study.

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Correspondence to Yuying Zheng.

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Lin, F., Hong, X., Chen, Z. et al. The influence of S-doped technique on supercapacitor performances for Co(OH)2@nitrogen-doped carbon dots. Ionics 29, 3249–3259 (2023). https://doi.org/10.1007/s11581-023-04982-4

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