标题：
High Performance Aqueous Sodium-Ion Capacitors Enabled by Pseudocapacitance of Layered MnO2
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所属单位：
材料科学与技术学院
发表刊物：
Energy Technol.
摘要：
Aqueous sodium-ion capacitors (ASICs) are becoming increasingly important due to the remarkable advantages of aqueous electrolyte about the excellent ionic conductivity, non-flammability and low cost compared with organic systems. But, low capacitance of the electric double-layer capacitive material and narrow potential window of aqueous electrolyte both have negative effects on the enhancement of energy density. Therefore, we employ typical pseudocapacitive material, layered MnO2/CNTs composite as cathode to fabricate sodium ion capacitor. It needs to be emphasized that the electrochemical process involves two kinds of energy storage mechanisms, such as the reversible Na+ adsorption/desorption onto the surface of each layer and fast Na+ (de)intercalation into the 2D interlayer space. Thus, the composite delivers a high specific capacitance (322.5 F g−1 at 0.5 A g−1) and an excellent cycle stability (5000 cycles with capacitance retention of approximately 90 %). By means of the synergistic effects of the layered MnO2/CNTs cathode, sodium-ion water-in-salt electrolyte (NaWiSE) and polyimide organic anode, the as-assembled ASIC achieves a high energy density of 78.5 Wh kg−1, accompanied by high power density of 11000 W kg−1 and excellent cycle performance (even 77 % capacity retention after 10000 cycles). © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
ISSN号：
2194-4288
是否译文：
否
发表时间：
2018-11-01
合写作者：
Zhang, Yadi,An, Yufeng,Jiang, Jiangmin,Dong, Shengyang,Wu, Langyuan,Fu, Ruirui,张校刚
通讯作者：
窦辉
发表时间：
2018-11-01
学位：理学博士学位
职称：教授
所在单位：材料科学与技术学院