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Structurally Composite Membranes of Titanium Oxide and Titanium Phosphorus Oxide for Proton Conduction at Intermediate Temperatures

Published online by Cambridge University Press:  11 February 2011

Toshinori Tsuru ,
Yasuhito Yagi ,
Yosuke Kinoshita ,
Tomohisa Yoshioka  and
Masashi Asada
Toshinori Tsuru
Affiliation:
Department of Chemical Engineering, Hiroshima University, Higashi-Hiroshima 739–8527, JAPAN
Yasuhito Yagi
Affiliation:
Department of Chemical Engineering, Hiroshima University, Higashi-Hiroshima 739–8527, JAPAN
Yosuke Kinoshita
Affiliation:
Department of Chemical Engineering, Hiroshima University, Higashi-Hiroshima 739–8527, JAPAN
Tomohisa Yoshioka
Affiliation:
Department of Chemical Engineering, Hiroshima University, Higashi-Hiroshima 739–8527, JAPAN
Masashi Asada
Affiliation:
Department of Chemical Engineering, Hiroshima University, Higashi-Hiroshima 739–8527, JAPAN
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Abstract

Composite membranes of titanium oxide and phosphorus oxide (TiP) were prepared by the sol-gel method and evaluated for use as proton conductive materials at intermediate temperatures. Titanium phosphorus oxide sol solutions were prepared by the hydrolysis of titanium isopropoxide (TTIP) using hydrochloric acid as a catalyst in isopropanol solutions, and the addition of an appropriate amount of phosphoric acid (H3PO4). A new concept for structurally composite membranes is proposed for proton conductive membranes. A composite membrane, Ti/TiP, where the pores of a porous titanium oxide layer are filled with titanium phosphorus oxide, was found to be effective for high electrical conductivity as well as mechanical strength. Electrical conductivities as high as 0.1 and 0.06 S cm−1 at 100 and 300 °C, respectively, under a partial pressure of water of 50 kPa, was achieved for the Ti/ TiP membranes.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 752: Symposium AA – Membranes–Preparation, Properties and Applications , 2002 , AA4.4
Copyright
Copyright © Materials Research Society 2003

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References

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