TY - JOUR
T1 - Proton transport properties of proton-conducting phosphate glasses at their glass transition temperatures
AU - Omata, Takahisa
AU - Yamaguchi, Takuya
AU - Tsukuda, Satoshi
AU - Ishiyama, Tomohiro
AU - Nishii, Junji
AU - Yamashita, Toshiharu
AU - Kawazoe, Hiroshi
N1 - Funding Information:
We thank Prof. Junichi Kawamura (Tohoku University) for valuable comments. This work was partly performed under the Cooperative Research Program of the ‘‘Network Joint Research Center for Materials and Devices’’ (No. 20173019 and 20183028) and ‘‘Dynamic Alliance for Open Innovation Bridging Human, Environment, and Materials’’.
Publisher Copyright:
© 2019 the Owner Societies.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2019
Y1 - 2019
N2 - The proton transport properties of 32 kinds of proton-conducting phosphate glasses with broad ranges of glass transition temperature, proton conductivity, and the proton carrier concentration were studied. Almost constant proton mobility of around 2 × 10-8 cm2 V-1 s-1 at the glass transition temperature, corresponding to a diffusion coefficient of approximately 4 × 10-10 cm2 s-1, was found for the glasses. The reason why the diffusion coefficient of protons is almost constant in various proton-conducting phosphate glasses was discussed based on the role of the protons as a cross-linker within the phosphate framework via hydrogen bonding. We evaluated the highest proton conductivity of the phosphate glasses and melts based on the almost constant mobility at their glass transition temperatures and obtained a highest expected proton conductivity of 7.5 × 10-3 S cm-1 at 300 °C. The potential of proton-conducting phosphate glasses as electrolytes in intermediate temperature fuel cells was also discussed.
AB - The proton transport properties of 32 kinds of proton-conducting phosphate glasses with broad ranges of glass transition temperature, proton conductivity, and the proton carrier concentration were studied. Almost constant proton mobility of around 2 × 10-8 cm2 V-1 s-1 at the glass transition temperature, corresponding to a diffusion coefficient of approximately 4 × 10-10 cm2 s-1, was found for the glasses. The reason why the diffusion coefficient of protons is almost constant in various proton-conducting phosphate glasses was discussed based on the role of the protons as a cross-linker within the phosphate framework via hydrogen bonding. We evaluated the highest proton conductivity of the phosphate glasses and melts based on the almost constant mobility at their glass transition temperatures and obtained a highest expected proton conductivity of 7.5 × 10-3 S cm-1 at 300 °C. The potential of proton-conducting phosphate glasses as electrolytes in intermediate temperature fuel cells was also discussed.
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U2 - 10.1039/c9cp01502g
DO - 10.1039/c9cp01502g
M3 - Article
C2 - 31086916
AN - SCOPUS:85066149860
VL - 21
SP - 10744
EP - 10749
JO - Physical Chemistry Chemical Physics
JF - Physical Chemistry Chemical Physics
SN - 1463-9076
IS - 20
ER -