CsH5(PO4)2 doped glass membranes for intermediate temperature fuel cells

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

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8 Citations (Scopus)

Abstract

This study reports the preparation of glass membranes doped with CsH5(PO4)2 by an optimized sol - gel method using phosphoric acid as a catalyst for tetraethylorthosilicate (TEOS) hydrolysis and the application of these membranes in intermediate temperature fuel cells (ITFCs). Infrared spectroscopy shows the formation of Si - O - P bonds and scanning electron microscopy shows that the glass membranes have smooth cross-sectional structures. Domains of CsH5(PO4)2 with sizes of 5-12 nm are uniformly distributed over the membrane cross section. The melting point of CsH5(PO4)2 in the glass membrane is lower by 20-40°C than that for pure CsH5(PO4)2. For a glass membrane with a molar ratio of SiO2:CsH5(PO4)2:H3PO4 = 4:1:0.36, 62% of the pore volume is filled with CsH5(PO4)2 and shows the best electrochemical performance. The glass membrane shows high conductivity of 22 mS cm-1 at 219°C. The membrane is novel because the silica support forms an interconnected matrix that provides stability, as shown by continuous operation at 210°C for at least 50 h. A fuel cell assembled with the glass membrane exhibits an open circuit voltage of 0.94 V and a peak power density of 85 mW cm-2. The fuel cell produces a stable output voltage of 0.53 V for at least 50 h under a current density of 100 mA cm-2.

Original languageEnglish
Pages (from-to)1018-1029
Number of pages12
JournalJournal of Power Sources
Volume272
DOIs
Publication statusPublished - Dec 25 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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