Proton conducting tungsten phosphate glass and its application in intermediate temperature fuel cells

T. Ishiyama, S. Suzuki, J. Nishii, T. Yamashita, H. Kawazoe, T. Omata

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

High concentrations of proton carriers (5.0 × 1021 cm - 3) were injected into tungsten phosphate glass (8WO 3-35NaO1/2-8NbO5/2-5LaO3/2-44PO 5/2) by electrochemical substitution of sodium ions with protons at 345 °C. The electromotive force of a hydrogen concentration cell that used the substituted glass as a solid electrolyte indicated a mixed conduction of protons and electrons in the glass with a mean proton transport number of 0.8 at 300 °C. The partial conductivity of the protons was 8.0 × 10 - 4 Scm- 1. The fuel cell generated electricity at a maximum power density of 1.3 mWcm- 2, even though its open circuit voltage was only 0.77 V because of the electronic contribution to the conductivity. Methods to increase the proton conductivity for improving fuel cell performance are discussed.

Original languageEnglish
Pages (from-to)856-859
Number of pages4
JournalSolid State Ionics
Volume262
DOIs
Publication statusPublished - 2014 Sep 1

Keywords

  • Electrochemical substitution
  • Intermediate temperature fuel cells
  • Proton conductor
  • Tungsten phosphate glass

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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