Synthesis of peanut-like hierarchical manganese carbonate microcrystals via magnetically driven self-assembly for high performance asymmetric supercapacitors

To construct a suitable structure for both electronic conduction and ionic transport towards supercapacitors, peanut-like hierarchical manganese carbonate (MnCO3) microcrystals assembled with floss-like nanowires are synthesized via a hydrothermal process and primarily used as an active material for...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2017, Vol.5 (8), p.3923-3931
Main Authors: Tang, Yongfu, Chen, Shunji, Chen, Teng, Guo, Wenfeng, Li, Yanshuai, Mu, Shichun, Yu, Shengxue, Zhao, Yufeng, Wen, Fusheng, Gao, Faming
Format: Article
Language:English
Subjects:
Asymmetry
Electrodes
Energy density
Lithosphere
Manganese
Microcrystals
Self assembly
Supercapacitors
Synthesis
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Summary:To construct a suitable structure for both electronic conduction and ionic transport towards supercapacitors, peanut-like hierarchical manganese carbonate (MnCO3) microcrystals assembled with floss-like nanowires are synthesized via a hydrothermal process and primarily used as an active material for supercapacitors. The formation mechanism is illustrated by means of a dissolution-recrystallization process and magnetically driven self-assembly. The electrode with peanut-like hierarchical MnCO3 microcrystals exhibits a high specific capacitance of 293.7 F g-1 and a superior cycle stability of 71.5% retention after 6000 cycles, which are higher than those of the reported Mn-based active materials in alkaline electrolytes. The asymmetric supercapacitor, assembled with the peanut-like MnCO3 electrode as the positive electrode and a home-made porous carbon electrode as the negative electrode, exhibits an energy density of 14.7 W h kg-1 at a power density of 90.2 W kg-1 and an energy density of up to 11.0 W h kg-1 at 3.3 kW kg-1. An as-assembled all-solid-state supercapacitor series can light up a LED indicator for 10 min, indicating a promising practical application of peanut-like MnCO3 microcrystals.
ISSN:2050-7488
2050-7496
DOI:10.1039/c6ta09997a