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Pseudo-Capacitors: SPPS Deposition and Electrochemical Analysis of α-MoO3 and Mo2N Coatings

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Abstract

Solution precursor plasma spraying (SPPS) is a novel thermal spray process in which a solution precursor is injected into the high-temperature zone of a DC-arc plasma jet to allow solvent evaporation from the precursor droplets, solute precipitation, and precipitate pyrolysis prior to substrate impact. This investigation explored the potential of SPPS to fabricate α-MoO3 coatings with fine grain sizes, high porosity levels, and high surface area: characteristics needed for application as pseudo-capacitor electrodes. Since molybdenum nitride has shown a larger electrochemical stability window and higher specific area capacitance, the α-MoO3 deposits were subsequently converted into molybdenum nitride. A multistep heat-treatment procedure resulted in a topotactic phase-transformation mechanism, which retained the high surface area lath-shaped features of the original α-MoO3. The electrochemical behaviors of molybdenum oxide and molybdenum nitride deposits formed under different deposition conditions were studied using cyclic voltammetry to assess the influence of the resulting microstructure on the charge storage behavior and potential for use in pseudo-capacitors.

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Acknowledgments

The authors would like to express their gratitude to Dr. Larry Pershin at the Centre for Advanced Coating Technologies (CACT) for his ongoing support in preparing the coatings. Special thanks go to Mr. Karim Danaei for his assistance with regard to the postdeposition heat treatment of the coatings. Also, a special thanks go to Ms. Sanaz Ketabi from Flexible Energy and Electronics Laboratory for assisting us with the electrochemical analyses of the coatings.

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Authors and Affiliations

  1. Materials Science and Metallurgy, University of Cambridge, Cambridge, UK

    Mehdi Golozar

  2. Materials Science and Engineering, University of Toronto, Toronto, ON, Canada

    Ken Chien, Keryn Lian & Thomas W. Coyle

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  1. Mehdi Golozar
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  2. Ken Chien
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  3. Keryn Lian
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  4. Thomas W. Coyle
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Correspondence to Mehdi Golozar.

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Golozar, M., Chien, K., Lian, K. et al. Pseudo-Capacitors: SPPS Deposition and Electrochemical Analysis of α-MoO3 and Mo2N Coatings. J Therm Spray Tech 22, 710–722 (2013). https://doi.org/10.1007/s11666-013-9925-8

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  • DOI: https://doi.org/10.1007/s11666-013-9925-8

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