CsH2PO4/Epoxy Composite Electrolytes for Intermediate Temperature Fuel Cells

Geletu Qing, Ryuji Kikuchi, Atsushi Takagaki, Takashi Sugawara, Shigeo Ted Oyama

Research output: Contribution to journalArticle

14 Citations (Scopus)


In this study CsH2PO4/epoxy composite electrolytes were prepared by dispersing CsH2PO4 particles, whose sizes were smaller than 10 μm, in a low-viscosity heat-resistant epoxy resin. The epoxy polymerization was promoted by thermal curing. The composite electrolyte consisted of a physical dispersion of CsH2PO4 particles in the cross-linked epoxy matrix. The polymerized epoxy showed a high thermal stability with no weight loss or phase transformation up to 290 °C. The composite electrolyte with 80 wt% CsH2PO4 showed a high conductivity of 11 mS cm-1 at 259 °C under 30% H2O/Ar atmosphere as well as a flexural strength of 7.3 MPa at room temperature. The composite electrolyte with 80 wt% CsH2PO4 showed a stable conductivity at 259 °C under 30% H2O/Ar atmosphere for 50 h. A fuel cell assembled with this electrolyte exhibited an open circuit voltage of 0.95 V and a peak power density of 38 mW cm-2. In addition, the fuel cell produced an output voltage higher than 0.44 V during a 6 h test under an output current density of 70 mA cm-2 with humidified H2 as the fuel and humidified O2 as the oxidant.

Original languageEnglish
Pages (from-to)219-226
Number of pages8
JournalElectrochimica Acta
Publication statusPublished - Jul 1 2015
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Electrochemistry

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