Bismuth phosphates as intermediate temperature proton conductors: From polycrystalline powders to amorphous glasses

Yunjie Huang, Erik Christensen, Qin Shuai, Qingfeng Li

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Proton conducting electrolyte materials operational in the intermediate temperature range of 200-400 °C are of special interest for applications in fuel cells and water electrolysers. Bismuth phosphates in forms of polycrystalline powders and amorphous glasses are synthesized and investigated by scanning electron microscopy, X-ray diffraction, FT-IR, thermogravimetric analysis and AC impedance. Under dry atmosphere the pure crystalline and amorphous phosphates exhibit an intrinsic conductivity of up to 10-5 S cm-1 at 250 °C. In the presence of atmospheric humidity the conductivity of both types of phosphates is significantly enhanced, reaching about 10-2 S cm-1 at a water vapor partial pressure above 0.5 atm. During a period of more than 100 h with four humidity cycles from zero to 0.58 atm of the water vapor partial pressure, the phosphates show good stability, suggesting the potential as an intermediate temperature electrolyte.
Original languageEnglish
JournalInternational Journal of Hydrogen Energy
Volume42
Issue number10
Pages (from-to)7235-7240
ISSN0360-3199
DOIs
Publication statusPublished - 2017

Keywords

  • Amorphous
  • Bismuth phosphate
  • Glass
  • Intermediate temperature
  • Polycrystalline
  • Proton conductor

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