TY - JOUR
T1 - Origin of the Temperature Dependence of Proton Conductivity in Phosphate Glass Prepared by Alkali-Proton Substitution Technique
AU - Ishiyama, Tomohiro
AU - Yamaguchi, Takuya
AU - Nishii, Junji
AU - Yamashita, Toshiharu
AU - Kawazoe, Hiroshi
AU - Omata, Takahisa
N1 - Funding Information:
This work was supported in part by a Grant-in-Aid for Scientific Research (B) (grant no. 20H02428). This work was partly performed under the Cooperative Research Program of the “Network Joint Research Center for Materials and Devices” (Nos. 20194020, 20204012, and 20214016) and “Dynamic Alliance for Open Innovation Bridging Human, Environment and Materials.”
Publisher Copyright:
© 2022 The Electrochemical Society ("ECS"). Published on behalf of ECS by IOP Publishing Limited. [DOI: 10.1149/1945-7111/ac5793].
PY - 2022/3
Y1 - 2022/3
N2 - The temperature dependence of proton conductivity in 36HO1/2-4NbO5/2-2BaO-4LaO3/2-4GeO2-1BO3/2-49PO5/2 glasses prepared through the alkali-proton substitution method was investigated in this study. The activation energy of proton conduction, Ea, was found to exhibit an non-Arrhenius type temperature dependence. The origin of the temperature dependence of the proton conductivity caused by thermal expansion of the glass structure was discussed in terms of the effect of changes in the local environment surrounding the protons. These changes were elucidated using Raman spectroscopy, 1H- and 31P-NMR, infrared spectroscopy, and molecular modeling. Because protons form O-H bonds, they are sensitive to changes in the distance between two oxygen atoms, which affects the strength of the hydrogen bond, and concluded that there is a temperature dependence as observed.
AB - The temperature dependence of proton conductivity in 36HO1/2-4NbO5/2-2BaO-4LaO3/2-4GeO2-1BO3/2-49PO5/2 glasses prepared through the alkali-proton substitution method was investigated in this study. The activation energy of proton conduction, Ea, was found to exhibit an non-Arrhenius type temperature dependence. The origin of the temperature dependence of the proton conductivity caused by thermal expansion of the glass structure was discussed in terms of the effect of changes in the local environment surrounding the protons. These changes were elucidated using Raman spectroscopy, 1H- and 31P-NMR, infrared spectroscopy, and molecular modeling. Because protons form O-H bonds, they are sensitive to changes in the distance between two oxygen atoms, which affects the strength of the hydrogen bond, and concluded that there is a temperature dependence as observed.
KW - Fuel Cells
KW - glass structure
KW - hydrogen bond
KW - phosphate glass
KW - proton conductivity
KW - thermal expansion
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U2 - 10.1149/1945-7111/ac5793
DO - 10.1149/1945-7111/ac5793
M3 - Article
AN - SCOPUS:85126706055
SN - 0013-4651
VL - 169
JO - Journal of the Electrochemical Society
JF - Journal of the Electrochemical Society
IS - 3
M1 - 034517
ER -
