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 - http://www.scopus.com/inward/record.url?scp=84865285578&partnerID=8YFLogxK
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 -