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Title

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

AuthorsVillaseca, Laura; Moreno, Berta; Lorite, Israel CSIC; Jurado Egea, José Ramón CSIC; Chinarro Martín, Eva CSIC ORCID
KeywordsElectrochemical devices for power generation
Impedance
Spectroscopy
Electrical conductivity
Nitrides
Powder-gas phase reaction
Issue DateApr-2015
PublisherElsevier
CitationCeramics International 41(3): 4282-4288 (2014)
AbstractTungsten nitride was synthesized from commercial WO3 and H2WO4, two precursors with different specific surface areas: 1.0 m2/g and 14.7 m2/g. The material was prepared by nitridation method by a thermal treatment at 873 K under NH3 flow. The W2N single phase was obtained with a crystal size of 15 nm and 11 nm, respectively, and with specific surface areas of 7.3 m2/g (from WO3) and 27.8 m2/g (from H2WO4). Both W2N exhibited high stability after a phosphoric acid attack. The W2N (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 W2N a promising candidate to be used in the electrode of electrochemical devices in high corrosive environments.
Publisher version (URL)https://doi.org/10.1016/j.ceramint.2014.11.114
URIhttp://hdl.handle.net/10261/179871
DOI10.1016/j.ceramint.2014.11.114
Identifiersdoi: 10.1016/j.ceramint.2014.11.114
issn: 0272-8842
e-issn: 1873-3956
Appears in Collections:(ICV) Artículos
(IPNA) Artículos

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