Abstract
In this work, hierarchically porous MnO/carbon (MnO/C) microsphere materials were fabricated by a facile two-step approach. The MnO precursors and the polymerization of dopamine were synthesized simultaneously by chemical solution method at room temperature. The dopamine plays a key role in the formation of MnO/C, which guides the growth of porous spherical structures and acts as a carbon source. The enhancement of electrochemical properties and electrical conductivity strongly depend on the porous structure of the composite electrodes. Benefiting from the unique structures, the optimized MnO/C electrode delivered a high specific capacitance of 378 F·g−1 at 0.1 A·g−1 and retained over 96.66% of its initial capacitance after 1000 cycles at 1 A·g−1, suggesting that MnO/C hybrid material has promising potential for practical supercapacitors.
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Funding
This work was supported by the National Natural Science Foundation of China (21401073), Science & Technology Nova Program of Jilin Province (20200301051RQ), Natural Science Foundation of Jilin Province of China (20170101211JC), Youth Foundation of Jilin Science and Technology (20190104194), and Science Foundation of Jilin Institute of chemical Technology (2018019).
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DH designed and engineered the samples; YS and YZ performed the experiments; YP and JW tested the sample; DH and YS wrote the paper; and YW contributed to the theoretical analysis. All authors contributed to the general discussion.
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Han, D., Shen, Y., Zhao, Y. et al. Porously nanostructured MnO/C composites directed from polydopamine as high-performance supercapacitor electrodes. J Mater Sci: Mater Electron 32, 5781–5789 (2021). https://doi.org/10.1007/s10854-021-05298-7
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DOI: https://doi.org/10.1007/s10854-021-05298-7