Abstract
Enhancement of supercapacitors (SCs) with high-energy density and high-power density is still a great challenge. In this paper, a facile strategy for in situ anchoring of Co3O4 particles on N doped carbon cloth (pCoNCC) is reported. Due to the interaction of the doped N and Co3O4, the electrochemical performance improves significantly, reaching 1,940.13 mF·cm−2 at 1 mA·cm−2 and energy density of 172.46 µWh·cm−2 at the power density of 400 µW·cm−2, much larger than that without N do** electrode of 28.5 mF·cm−2. An aqueous symmetric supercapacitor (ASSC) assembled by two pCoNCC electrodes achieves a maximum energy density of 447.42 µWh·cm−2 and a highest power density of 8,000 µW·cm−2. Utilizing such a high-energy storage ASSC, a digital watch and a temperature-humidity detector are powered for nearly 1 and 2 h, respectively. Moreover, the ASSC displays a superb electrochemical stability of 87.7% retention after 10,000 cycles at 40 mA·cm−2. This work would provide a new sight to enhance active materials performance and be beneficial for the future energy storage and supply systems.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Nos. 51772036 and 51572040) and the Fundamental Research Funds for the Central Universities (Nos. 2019CDXZWL001 and 2020CDCGJ005). We would like to thank Analytical and Testing Center of Chongqing University for ESEM, BET, XPS, EDS and XRD measurement.
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Lu, J., Li, J., Wan, J. et al. A facile strategy of in-situ anchoring of Co3O4 on N doped carbon cloth for an ultrahigh electrochemical performance. Nano Res. 14, 2410–2417 (2021). https://doi.org/10.1007/s12274-019-3242-6
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DOI: https://doi.org/10.1007/s12274-019-3242-6