Transport properties of proton conducting phosphate glass: An electrochemical hydrogen pump enabling the formation of dry hydrogen gas

Tomohiro Ishiyama, Haruo Kishimoto, Katsuhiko Yamaji, Takuya Yamaguchi, Junji Nishii, Toshiharu Yamashita, Hiroshi Kawazoe, Takahisa Omata

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In this study, a proton conducting phosphate glass, which was fabricated by alkali-proton substitution, was clearly demonstrated to transport protons over a wide oxygen partial pressure in air and hydrogen atmospheres, and in both dry and wet conditions. The proton transport number was confirmed to be unity, regardless of whether the glass was exposed to air or hydrogen atmospheres, in both hydrogen concentration and water vapor concentration cells. The dry hydrogen can be formed by electrochemical hydrogen pumping without current leakage as a result of the presence of other charge carriers. These properties derive from a proton incorporation mechanism, which is non-dependent on defect equilibria, unlike acceptor-doped perovskite-type proton conducting oxides. The advantages of applying this proton conducting glass electrolyte to fuel cells and steam electrolysis is also discussed.

Original languageEnglish
Pages (from-to)24977-24984
Number of pages8
JournalInternational Journal of Hydrogen Energy
Volume44
Issue number45
DOIs
Publication statusPublished - 2019 Sep 20

Keywords

  • Hydrogen pumping
  • Intermediate temperature fuel cell
  • Phosphate glass
  • Proton conductor
  • Proton transport number

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Transport properties of proton conducting phosphate glass: An electrochemical hydrogen pump enabling the formation of dry hydrogen gas'. Together they form a unique fingerprint.

  • Cite this