Enhancement effect of Na ions on capacitive behavior of amorphous MnO2

被引：42
|
作者：
Ye, Qinglan [1 ]
Dong, Ruiting [1 ]
Xia, Zihao [1 ]
Chen, Guoren [1 ]
Wang, Haili [1 ]
Tan, Guojin [1 ]
Jiang, Li [1 ]
Wang, Fan [1 ]
机构：
[1] Guangxi Univ, Sch Chem & Chem Engn, Nanning 530004, Peoples R China
来源：
ELECTROCHIMICA ACTA | 2014年 / 141卷
基金：
中国国家自然科学基金;
关键词：
Mn oxides; Pre-intercalation; Supercapacitors; Amorphous; FLEXIBLE ASYMMETRIC SUPERCAPACITORS; MOLECULAR-SIEVE NANOMATERIALS; CORE-SHELL NANOWIRES; MANGANESE OXIDE; HIGH-PERFORMANCE; HYDROTHERMAL SYNTHESIS; BIRNESSITE NANOSHEETS; TUNNEL STRUCTURE; OXIDATION; STORAGE;
D O I：
10.1016/j.electacta.2014.07.076
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Na+-intercalated MnO2 is synthesized via hydrothermal reduction. For comparison, the pristine and K+-intercalated MnO2 are also synthesized and characterized. Cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopy methods have been carried out to study the electrochemical properties of the obtained MnO2 electrode. Na+-intercalated MnO2 electrode shows the improved Na+ diffusion coefficient and electrical conductivity, which is suitable for supercapacitor. A specific capacitance (based on Na+-intercalated MnO2) of 295 F.g(-1) at a current density of 1 A.g(-1) is obtained in Na2SO4 aqueous solution. Such results suggest that pre-intercalation of alkaline cations into Mn oxides is an effective method to enhance the electrochemical activity in alkaline electrolytes. Moreover, an all-solid-state symmetric supercapacitor based on Na+-intercalated MnO2 electrode is assembled and tested. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：286 / 293
页数：8
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