Synthesis and characterization of tungsten nitride (W2N) from WO3 and H2WO4 to be used in the electrode of electrochemical devices. Issue 3 (April 2015)

• Record Type: Journal Article
• Authors: Villaseca, L.; Moreno, B.; Lorite, I.; Jurado, J.R.; Chinarro, E.
• Is Part Of: Ceramics international. Volume 41:Issue 3(2015)Part B
• Page Start: 4282
• Page End: 4288
• Publication Date: 2015-04
• Subjects: Powder-gas phase reaction -- Nitrides -- Electrical conductivity -- Impedance -- Spectroscopy -- Electrochemical devices for power generation; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2014.11.114
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Tungsten nitride was synthesized from commercial WO3 and H2 WO4, two precursors with different specific surface areas: 1.0 m 2 /g and 14.7 m 2 /g. The material was prepared by nitridation method by a thermal treatment at 873 K under NH3 flow. The W2 N single phase was obtained with a crystal size of 15 nm and 11 nm, respectively, and with specific surface areas of 7.3 m 2 /g (from WO3 ) and 27.8 m 2 /g (from H2 WO4 ). Both W2 N exhibited high stability after a phosphoric acid attack. The W2 N (WO3 ) powders show a high conductivity with a low activation energy (0.02 eV) measured by Electrochemical Impedance Spectroscopy. Those properties, that is, stability, high electronic conductivity and low activation energy make W2 N a promising candidate to be used in the electrode of electrochemical devices in high corrosive environments.