A study of hydrated nanostructured tungsten trioxide as an electroactive material for pseudocapacitors

被引：38

作者：

Farsi, Hossein ^{[1
]}

Gobal, Fereydoon ^{[2
]}

Barzgari, Zahra ^{[1
]}

机构：

[1] Univ Birjand, Dept Chem, Birjand, Iran

[2] Sharif Univ Technol, Dept Chem, Tehran, Iran

来源：

IONICS | 2013年 / 19卷 / 02期

关键词：

Nanostructure; Tungsten trioxide; Capacitive behavior; Pseudocapacitor; Electrochemical impedance spectroscopy; WO3; THIN-FILMS; MIXED-OXIDE PSEUDOCAPACITORS; CHARGE STORAGE MECHANISM; GAS-SENSING PROPERTIES; ELECTROCHEMICAL CAPACITORS; MATHEMATICAL-MODEL; SOL-GEL; SUPERCAPACITOR ELECTRODE; THERMAL EVAPORATION; MOLYBDENUM OXIDE;

D O I：

10.1007/s11581-012-0726-8

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Agglomerates of tungsten trioxide in the range of 90 nm to 1 mu m are prepared by the acid precipitation method and characterized by XRD as well as scanning electron microscopy. The product when coated with platinum showed pseudocapacitance when in contact with acidic electrolyte in the potential range of 0.1 to -0.25 V/SCE. Capacitance in the range of 0.014 to 0.039 F cm(-2) exhibiting moderate potential dependencies measured through both chronopotentiometry and impedance spectroscopy is presumed to be due to the insertion/de-insertion of protons into the lattice of tungsten trioxide. Equivalent circuit consisting of parallel simulators of mass transfer and capacitor charging (insertion/de-insertion) fully compatible with the impedance measurements has been proposed and circuit parameters have been derived.

引用

页码：287 / 294

页数：8

共 48 条

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