Effect of alkaline-earth species in phosphate glasses on the mobility of proton carriers

Takuya Yamaguchi, Yasuhisa Saito, Yasutaka Kuwahara, Hiromi Yamashita, Tomohiro Ishiyama, Junji Nishii, Toshiharu Yamashita, Hiroshi Kawazoe, Takahisa Omata

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7 Citations (Scopus)

Abstract

In this work, the effect of alkaline-earth species used in phosphate glasses on the mobility of proton carriers was investigated. Initially, 35NaO1/2-5RO-3NbO5/2-3LaO3/2-2GeO2-2BO3/2-50PO5/2 (R: Mg and Ba) glasses were subjected to the electrochemical substitution of Na+ ions with H+ at intermediate temperatures, producing proton conductors with high proton carrier concentrations (>8 × 1021 cm-3). The mobility of the proton carriers in the Ba glass was higher than that in the Mg glass. We studied the origin of this phenomenon in terms of the O-H and P-O bonding features using infrared spectroscopy and X-ray photoelectron spectroscopy, respectively. The higher mobility of proton carriers in Ba glass was attributed to weaker O-H bonding, which originated from the highly ionic character of Ba-O bonding compared with the comparatively covalent Mg-O bonding. Our findings indicate that a higher mobility of proton carriers can be achieved for glasses containing less electronegative glass network modifiers. The application of this strategy would be beneficial for the development of proton-conducting glass electrolytes for intermediate-temperature fuel cells.

Original languageEnglish
Pages (from-to)12385-12392
Number of pages8
JournalJournal of Materials Chemistry A
Volume5
Issue number24
DOIs
Publication statusPublished - 2017 Jan 1

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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  • Cite this

    Yamaguchi, T., Saito, Y., Kuwahara, Y., Yamashita, H., Ishiyama, T., Nishii, J., Yamashita, T., Kawazoe, H., & Omata, T. (2017). Effect of alkaline-earth species in phosphate glasses on the mobility of proton carriers. Journal of Materials Chemistry A, 5(24), 12385-12392. https://doi.org/10.1039/c7ta01475a