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  Electrochemical stability of hexagonal tungsten carbide in the potential window of fuel cells and water electrolyzers investigated in a half-cell configuration

Göhl, D., Mingers, A. M., Geiger, S., Schalenbach, M., Cherevko, S., Knossalla, J., et al. (2018). Electrochemical stability of hexagonal tungsten carbide in the potential window of fuel cells and water electrolyzers investigated in a half-cell configuration. Electrochimica Acta, 270, 70-76. doi:10.1016/j.electacta.2018.02.129.

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 Creators:
Göhl, Daniel1, Author
Mingers, Andrea M.1, Author
Geiger, Simon1, Author
Schalenbach, Maximilian1, Author
Cherevko, Serhiy1, 2, Author
Knossalla, Johannes3, Author              
Jalalpoor, Daniel3, Author              
Schüth, Ferdi3, Author              
Mayrhofer, Karl J.J.1, 2, Author
Ledendecker, Marc1, Author
Affiliations:
1Department of Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung, 40237 Düsseldorf, Germany, ou_persistent22              
2Helmholtz-Institute Erlangen-Nürnberg for Renewable Energy (IEK-11), Forschungszentrum Jülich, 91058 Erlangen, Germany, ou_persistent22              
3Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445589              

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Free keywords: Tungsten carbide; Fuel cell; Electrochemical stability; Dissolution; Catalyst support
 Abstract: Tungsten carbide has attracted much interest as possible support for oxygen reduction and hydrogen oxidation in fuel cells and as catalyst itself for the hydrogen evolution reaction in water electrolyzers in the last years. Herein, we investigate the dissolution behavior of hexagonal tungsten carbide in acidic media with cyclovoltammetric and galvanostatic procedures under steady-state and dynamic conditions. The tungsten dissolution rate in the electrolyte was monitored in-situ and time resolved via coupling of the scanning flow cell with an inductively coupled plasma mass spectrometer (SFC-ICP-MS), allowing a direct correlation of potential and amount of dissolved species. The stability and passivation behavior of tungsten carbide was compared to pristine tungsten metal and its highest oxide WO3 in fuel cell/electrolyzer relevant potential ranges. It was found that partial passivation in the oxygen reduction region takes place, accompanied by steady dissolution of tungsten slightly above these potentials. In the HER/HOR region, no significant dissolution was observed. The dissolution rate of WC at high potentials was found to be in many cases almost one order of magnitude lower than for the pristine metal, yet two orders of magnitude higher than for its corresponding highest oxide.

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Language(s): eng - English
 Dates: 2017-09-282018-02-242018-03-142018-04-20
 Publication Status: Published in print
 Pages: 7
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.electacta.2018.02.129
 Degree: -

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Title: Electrochimica Acta
  Abbreviation : Electrochim. Acta
Source Genre: Journal
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Publ. Info: Oxford, UK : Pergamon-Elsevier Science Ltd
Pages: - Volume / Issue: 270 Sequence Number: - Start / End Page: 70 - 76 Identifier: ISSN: 0013-4686
CoNE: https://pure.mpg.de/cone/journals/resource/954925396434