Issue 27, 2013

Bimetallic molybdenum tungsten oxynitride: structure and electrochemical properties

Abstract

Mesoporous molybdenum tungsten oxynitride was synthesised by the temperature-programmed reduction of the bimetallic oxide precursor in ammonia and its electrochemical properties were investigated in 1 M H2SO4 aqueous electrolyte. The reaction product is a single-phase material, in which molybdenum and tungsten are distributed throughout the sample, with mesoporous morphology. The maximum of the pore size distribution is located at approximately 4 nm. Nearly rectangular voltammograms with the presence of small redox peaks were detected by cyclic voltammetry measurements in the acidic aqueous electrolyte, indicating properties relevant to electrochemical supercapacitors. The capacitance of 124 F g−1 was measured by galvanostatic charge–discharge and 43% of the initial capacitance can be retained upon the 400-fold increase in the current density from 0.05 to 20 A g−1. The electrochemical properties and the rate capability of the synthesised material are compared with those of monometallic oxynitrides of molybdenum and tungsten. A symmetric cell assembled with molybdenum tungsten oxynitride electrodes is also evaluated.

Graphical abstract: Bimetallic molybdenum tungsten oxynitride: structure and electrochemical properties

Article information

Article type
Paper
Submitted
27 Feb 2013
Accepted
28 Apr 2013
First published
03 May 2013
This article is Open Access
Creative Commons BY license

J. Mater. Chem. A, 2013,1, 7889-7895

Bimetallic molybdenum tungsten oxynitride: structure and electrochemical properties

O. Kartachova, A. M. Glushenkov, Y. Chen, H. Zhang and Y. Chen, J. Mater. Chem. A, 2013, 1, 7889 DOI: 10.1039/C3TA10836H

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