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Home  >  Journal list  >  Journal of the Ceramic Society of Japan, Supplement 112-1, PacRim5 Special Issue  >  Vol.112  9. Electronic and Ionic Conductors  >  pp.S703-S708

Journal of the Ceramic Society of Japan, Supplement 112-1, PacRim5 Special Issue
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Characterization of Microstructure and Conductivity of Protonic CsHSO4-SiO2 Composite Electrolytes Using Porous SiO2 Sheets

Shuqiang WANG1), Junichiro OTOMO2), Ching-ju WEN3), Takeshi KOBAYASHI1), Hidetoshi NAGAMOTO2) and Hiroshi TAKAHASHI1)
1) Department of Chemical System Engineering, School of Engineering, The University of Tokyo
2) Department of Environmental Chemical Engineering, Kogakuin University
3) Department of Energy Sciences, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology


  The proton conductive CsHSO4-SiO2 composite electrolytes prepared by vacuum infiltration using CsHSO4 aqueous solution and porous SiO2 sheets with pore sizes of 1000-4 nm were investigated. XRD and DTA analyses revealed that the crystallization and phase transition of the CsHSO4 phases filled inside the pores could be controlled by the pore sizes of the porous SiO2 sheets. The low-temperature conductivities of the composites obtained after both drying and annealing processes were improved significantly with the decrease in pore sizes of the porous SiO2 matrix. Particularly, the composite obtained by using the porous SiO2 sheet with average pore size of 4 nm exhibited the superprotonic conducting characteristic down to lower temperatures below 100°C. It was evidenced that the CsHSO4 phase filled inside the nano-pores existed in the form of mostly amorphous phase.


Keyword:
Cesium hydrogen sulphate, Silicon dioxide, Proton conductor, Composite solid electrolyte

Received: August 07, 2003
Accepted: December 10, 2003 , Published online: September 29, 2004
Copyright (c) 2004 The Ceramic Society of Japan

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