Stability of CsH5(PO4)2-based composites at fixed temperatures and during heating-cooling cycles for solid-state intermediate temperature fuel cells

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

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

This work reports the stability of CsH5(PO4)2-based composites at fixed temperatures (158 °C and 210 °C) and during three heating-cooling cycles (106 °C → 158 °C → 106 °C). Composites of CsH5(PO4)2 and SiO2 prepared by pressing the corresponding powders were stable at fixed temperatures, but were not stable during repeated heating and cooling due to the structural damage or existence of CsH5(PO4)2 particles that were not highly dispersed in the silica matrix. Composites of CsH5(PO4)2 and SiP2O7 absorbed a large amount of water into the electrolyte inner phase and formed a paste. The absorbed water had a significant influence on the electrolyte conductivity. Doped glasses of CsH5(PO4)2, which had an interconnected silica matrix with 5-12 nm pores filled with CsH5(PO4)2, exhibited stable conductivity both at fixed temperatures and during three heating-cooling cycles. From these findings, it was concluded that matrices with both strong interfacial interaction with CsH5(PO4)2 and interconnected structure were important to the preparation of CsH5(PO4)2-based composites with high stability.

Original languageEnglish
Pages (from-to)578-586
Number of pages9
JournalJournal of Power Sources
Volume306
DOIs
Publication statusPublished - Feb 29 2016
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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