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

页码：286 / 293

页数：8

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