Electrochemical capacitance of mesoporous tungsten oxynitride in aqueous electrolytes

Olga Kartachova; Alexey M. Glushenkov; Yanhui Chen; Hongzhou Zhang; Xiujuan J. Dai; Ying Chen

doi:10.1016/j.jpowsour.2012.07.132

Electrochemical capacitance of mesoporous tungsten oxynitride in aqueous electrolytes

Olga Kartachova
, Alexey M. Glushenkov^*
, Yanhui Chen
, Hongzhou Zhang
, Xiujuan J. Dai
, Ying Chen

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

50 Citations (Scopus)

Abstract

Transition metal nitrides and oxynitrides are promising candidates for the application in electrodes of supercapacitors. In this manuscript characterization of tungsten oxynitride and its electrochemical properties in a range of aqueous electrolytes (1 M H ₂SO ₄, 1 M KOH, 3 M KCl, 3 M NaCl, 1 M LiCl and 1 M CaCl ₂) are presented. The electrochemical behavior of tungsten oxynitride depends strongly on the type of cation present in the electrolyte, and the highest capacitance value of 85 F g ^-1 is measured in 1 M H ₂SO ₄. Cyclic stability in the acid, neutral and alkaline electrolytes is evaluated, and the highest stability is observed in 1 M KOH electrolyte. Possible charge-discharge mechanisms are discussed, and the contribution of a pseudocapacitive mechanism in addition to the electric double-layer formation is proposed.

Original language	English
Pages (from-to)	298-305
Number of pages	8
Journal	Journal of Power Sources
Volume	220
DOIs	https://doi.org/10.1016/j.jpowsour.2012.07.132
Publication status	Published - 15 Dec 2012
Externally published	Yes

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10.1016/j.jpowsour.2012.07.132

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title = "Electrochemical capacitance of mesoporous tungsten oxynitride in aqueous electrolytes",

abstract = "Transition metal nitrides and oxynitrides are promising candidates for the application in electrodes of supercapacitors. In this manuscript characterization of tungsten oxynitride and its electrochemical properties in a range of aqueous electrolytes (1 M H 2SO 4, 1 M KOH, 3 M KCl, 3 M NaCl, 1 M LiCl and 1 M CaCl 2) are presented. The electrochemical behavior of tungsten oxynitride depends strongly on the type of cation present in the electrolyte, and the highest capacitance value of 85 F g -1 is measured in 1 M H 2SO 4. Cyclic stability in the acid, neutral and alkaline electrolytes is evaluated, and the highest stability is observed in 1 M KOH electrolyte. Possible charge-discharge mechanisms are discussed, and the contribution of a pseudocapacitive mechanism in addition to the electric double-layer formation is proposed.",

keywords = "Aqueous electrolytes, Cyclic stability, Oxynitrides, Pseudocapacitance, Supercapacitors",

author = "Olga Kartachova and Glushenkov, \{Alexey M.\} and Yanhui Chen and Hongzhou Zhang and Dai, \{Xiujuan J.\} and Ying Chen",

year = "2012",

month = dec,

day = "15",

doi = "10.1016/j.jpowsour.2012.07.132",

language = "English",

volume = "220",

pages = "298--305",

journal = "Journal of Power Sources",

issn = "0378-7753",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Electrochemical capacitance of mesoporous tungsten oxynitride in aqueous electrolytes

AU - Kartachova, Olga

AU - Glushenkov, Alexey M.

AU - Chen, Yanhui

AU - Zhang, Hongzhou

AU - Dai, Xiujuan J.

AU - Chen, Ying

PY - 2012/12/15

Y1 - 2012/12/15

N2 - Transition metal nitrides and oxynitrides are promising candidates for the application in electrodes of supercapacitors. In this manuscript characterization of tungsten oxynitride and its electrochemical properties in a range of aqueous electrolytes (1 M H 2SO 4, 1 M KOH, 3 M KCl, 3 M NaCl, 1 M LiCl and 1 M CaCl 2) are presented. The electrochemical behavior of tungsten oxynitride depends strongly on the type of cation present in the electrolyte, and the highest capacitance value of 85 F g -1 is measured in 1 M H 2SO 4. Cyclic stability in the acid, neutral and alkaline electrolytes is evaluated, and the highest stability is observed in 1 M KOH electrolyte. Possible charge-discharge mechanisms are discussed, and the contribution of a pseudocapacitive mechanism in addition to the electric double-layer formation is proposed.

AB - Transition metal nitrides and oxynitrides are promising candidates for the application in electrodes of supercapacitors. In this manuscript characterization of tungsten oxynitride and its electrochemical properties in a range of aqueous electrolytes (1 M H 2SO 4, 1 M KOH, 3 M KCl, 3 M NaCl, 1 M LiCl and 1 M CaCl 2) are presented. The electrochemical behavior of tungsten oxynitride depends strongly on the type of cation present in the electrolyte, and the highest capacitance value of 85 F g -1 is measured in 1 M H 2SO 4. Cyclic stability in the acid, neutral and alkaline electrolytes is evaluated, and the highest stability is observed in 1 M KOH electrolyte. Possible charge-discharge mechanisms are discussed, and the contribution of a pseudocapacitive mechanism in addition to the electric double-layer formation is proposed.

KW - Aqueous electrolytes

KW - Cyclic stability

KW - Oxynitrides

KW - Pseudocapacitance

KW - Supercapacitors

UR - https://www.scopus.com/pages/publications/84865285578

U2 - 10.1016/j.jpowsour.2012.07.132

DO - 10.1016/j.jpowsour.2012.07.132

M3 - Article

SN - 0378-7753

VL - 220

SP - 298

EP - 305

JO - Journal of Power Sources

JF - Journal of Power Sources

ER -

Electrochemical capacitance of mesoporous tungsten oxynitride in aqueous electrolytes

Abstract

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