Ultra-thin phosphate glass exhibiting high proton conductivity at intermediate temperatures

Issei Suzuki, Masataka Tashiro, Takuya Yamaguchi, Tomohiro Ishiyama, Junji Nishii, Toshiharu Yamashita, Hiroshi Kawazoe, Takahisa Omata

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Ultra-thin proton-conducting phosphate glass was fabricated by press-forming at high temperature. The glass was evaluated for its ohmic loss reduction when installed as an electrolyte in intermediate-temperature fuel cells. The 36HO1/2–4NbO5/2–2BaO–4LaO3/2–4GeO2–1BO3/2–49PO5/2 glass (36H-glass) was prepared by alkali-proton substitution. Herein, 3–4 mg of 36H-glass was placed onto a 50 μm-thick stainless steel or Pd support and then sandwiched by a glassy carbon plate, whereupon a 600 kg load was applied at temperatures varying as 333–391 °C. Ultra-thin 36H-glass with a thickness of 16 μm was successfully obtained without degradation of proton conductivity. A fuel cell incorporating the Pd-supported ultra-thin 36H-glass was successfully operated at 300 °C, and the ohmic loss of the fuel cell was reduced down to 2.7 Ω cm2 from the previous reported value of several tens of Ω·cm2.

Original languageEnglish
Pages (from-to)16690-16697
Number of pages8
JournalInternational Journal of Hydrogen Energy
Volume45
Issue number33
DOIs
Publication statusPublished - 2020 Jun 24

Keywords

  • Intermediate temperature fuel cells
  • Press forming
  • Proton-conducting phosphate glass
  • Ultra-thin electrolyte

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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