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Electrochemical Performance of an Asymmetric Coin Cell Supercapacitor Based on Marshmallow-like MnO2/Carbon Cloth in Neutral and Alkaline Electrolytes
Energy & Fuels ( IF 5.2 ) Pub Date : 2021-01-21 , DOI: 10.1021/acs.energyfuels.0c03807 Jieyu Miao 1 , Chen Zhou 1 , Xuehua Yan 1, 2 , Hui Jiang 1 , Mingyu You 1 , Yihan Zhu 1 , Yanli Li 1 , Wending Zhou 1 , Xiaonong Cheng 1
Energy & Fuels ( IF 5.2 ) Pub Date : 2021-01-21 , DOI: 10.1021/acs.energyfuels.0c03807 Jieyu Miao 1 , Chen Zhou 1 , Xuehua Yan 1, 2 , Hui Jiang 1 , Mingyu You 1 , Yihan Zhu 1 , Yanli Li 1 , Wending Zhou 1 , Xiaonong Cheng 1
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As a new energy-storage device, a supercapacitor has attracted great attention, but its low power density limits its wide application. The key to develop high-performance supercapacitors is to find high-performance electrode materials and design reasonable structures. Here, based on the strategy of structure construction and flexible self-growth, a simple one-step hydrothermal method was used to prepare marshmallow-like MnO2/CC electrode material. The electrochemical properties of the composite in different electrolytes (neutral and alkaline electrolyte) were investigated. This electrode material has excellent electrochemical characteristics in a Na2SO4 electrolyte, with a specific areal capacitance of MnO2/CC of 624 mF cm–2 and an excellent cycle performance (97.7% after 2000 cycles). As a comparison, the electrode displays higher specific capacitance (1092 mF cm–2) and poor cycle performance (49.5%) in KOH. An asymmetric coin cell supercapacitor (ACC) device was assembled using MnO2/CC as a positive electrode, active carbon as a negative electrode, and Na2SO4 as the electrolyte. The device shows good specific capacitance (67.8 F g–1) and stable cycle stability (97.3%), superior to many reported supercapacitors.
中文翻译：
棉花糖样MnO 2 /碳布不对称纽扣电池超级电容器在中性和碱性电解质中的电化学性能
超级电容器作为一种新型的储能设备备受关注，但其低功率密度限制了其广泛应用。开发高性能超级电容器的关键是找到高性能电极材料并设计合理的结构。在此，基于结构构造和自增长的策略，采用简单的一步水热法制备了棉花糖状的MnO 2 / CC电极材料。研究了复合材料在不同电解质（中性和碱性电解质）中的电化学性能。该电极材料在Na 2 SO 4电解质中具有出色的电化学特性，MnO 2 / CC的比表面积电容为624 mF cm–2和出色的循环性能（2000次循环后为97.7％）。作为比较，该电极在KOH中显示出较高的比电容（1092 mF cm -2）和较差的循环性能（49.5％）。使用MnO 2 / CC作为正电极，活性炭作为负电极以及Na 2 SO 4作为电解质，组装了不对称纽扣电池超级电容器（ACC）器件。该器件具有良好的比电容（67.8 F g –1）和稳定的循环稳定性（97.3％），优于许多报道的超级电容器。
更新日期：2021-02-04
中文翻译：
棉花糖样MnO 2 /碳布不对称纽扣电池超级电容器在中性和碱性电解质中的电化学性能
超级电容器作为一种新型的储能设备备受关注，但其低功率密度限制了其广泛应用。开发高性能超级电容器的关键是找到高性能电极材料并设计合理的结构。在此，基于结构构造和自增长的策略，采用简单的一步水热法制备了棉花糖状的MnO 2 / CC电极材料。研究了复合材料在不同电解质（中性和碱性电解质）中的电化学性能。该电极材料在Na 2 SO 4电解质中具有出色的电化学特性，MnO 2 / CC的比表面积电容为624 mF cm–2和出色的循环性能（2000次循环后为97.7％）。作为比较，该电极在KOH中显示出较高的比电容（1092 mF cm -2）和较差的循环性能（49.5％）。使用MnO 2 / CC作为正电极，活性炭作为负电极以及Na 2 SO 4作为电解质，组装了不对称纽扣电池超级电容器（ACC）器件。该器件具有良好的比电容（67.8 F g –1）和稳定的循环稳定性（97.3％），优于许多报道的超级电容器。
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