Abstract
High performance electrochemical energy storage device is an important means to solve the energy problem. As one of the next generation energy storage components, supercapacitor has received more and more attention in recent years. In this work, we synthesized a self-supporting MnCo2O4@Co(OH)2 core–shell heterostructure (CSHs), this can not only enhance the strength of the material, but also generate abundant electron transport pathways. In addition, we also added flaky carbon nitride (g-C3N4) after treatment with nitric acid (HNO3) to improve the cycle stability and specific capacitance of the material. By adjusting the chemical bath (CBD) time, the loading amount of Co(OH)2 nanosheets can be controlled, giving full play to the synergy between the materials, so that the prepared composite has greater specific capacitance, higher rate performance and better cycle stability. When the current density is 0.5 A·g−1, the specific capacitance of the composite is about 1932 F·g−1. In the two electrode system, the energy density is 23.2 Wh·kg−1 at a power density of 600 W·kg−1. At a high current density of 10 A·g−1, after 10,000 cycles, the initial capacitance of the composite material maintained 83.3%.
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Acknowledgements
This study was funded by the Jiangsu Higher Institutions Key Basic Research Projects of Natural Science (18KJA430003), Independent Research Project of Key Laboratory of Green Catalytic Materials and Technology of Jiangsu Province in 2018 (ZZZD201803) and Natural Science Research Plan of Huai'an in 2019 (HAB201952).
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WL: designed the experiments and discussed the results. XL: carried out the experiments, analysis, as well as prepared the manuscript. JS: helped with sample preparation. SZ, CY, and XL: gave technical support.
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Liu, W., Li, X., Sun, J. et al. MnCo2O4@Co(OH)2-g-C3N4 preparation of composite materials and their performance in supercapacitors. J Mater Sci: Mater Electron 34, 378 (2023). https://doi.org/10.1007/s10854-022-09753-x
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DOI: https://doi.org/10.1007/s10854-022-09753-x