An investigation of nanostructured thin film α-MoO3 based supercapacitor electrodes in an aqueous electrolyte

被引：168

作者：

Mendoza-Sanchez, Beatriz ^{[1
]}

Brousse, Thierry ^{[2
]}

Ramirez-Castro, Claudia ^{[2
]}

Nicolosi, Valeria ^{[1
]}

Grant, Patrick S. ^{[1
]}

机构：

[1] Univ Oxford, Dept Mat, Oxford OX1 3PH, England

[2] Univ Nantes, CNRS, Inst Mat Jean Rouxel IMN, F-44322 Nantes 3, France

来源：

ELECTROCHIMICA ACTA | 2013年 / 91卷

基金：

英国工程与自然科学研究理事会;

关键词：

alpha-MoO3; nanobelts; Supercapacitors; Redox activity; Capacitance; Cyclability; MANGANESE OXIDE; ELECTROCHEMICAL CHARACTERIZATION; MOLYBDENUM OXIDE; BEHAVIOR; MOO3; MNO2; REVERSIBILITY; PERFORMANCE; COMPOSITES; MICROSCOPY;

D O I：

10.1016/j.electacta.2012.11.127

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The potential for MoO3 use as a supercapacitor electrode in aqueous electrolytes was investigated, alpha-MoO3 nanobelts were synthesized using a hydrothermal method and then thin-film electrodes were manufactured by spray deposition. Electrochemical testing in several aqueous electrolytes showed significant charge storage in 1 M H2SO4 with a complex electrochemical activity that was further investigated by X-ray photoelectron spectroscopy and various electrochemical characterization methods. In a 0-1 V (vs Ag/AgCl) electrochemical window, MoO3 was reduced to a mixture of lower valence oxides with concentrations varying as Mo (5+) > Mo (4+) > Mo (6+), with MoO2 as the main component at potentials below 0.185 V (vs Ag/AgCl). The degree of redox reversibility was evaluated in order to optimize the electrochemical window for enhanced cyclability. A moderate capacitance of 8.8 F g(-1) (64 mu F cm(-2)) was fully retained for 720 cycles in an optimized electrochemical window of 0.26-0.43 V (vs Ag/AgCl). (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：253 / 260

页数：8