Open AccessOrigin of the Temperature Dependence of Proton Conductivity in Phosphate Glass Prepared by Alkali-Proton Substitution Technique
Author(s) -
Tomohiro Ishiyama,
T. Yamaguchi,
Junji Nishii,
Toshiharu Yamashita,
Hiroshi Kawazoe,
Takahisa Omata
Publication year - 2022
Publication title -
journal of the electrochemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.258
H-Index - 271
eISSN - 1945-7111
pISSN - 0013-4651
DOI - 10.1149/1945-7111/ac5793
Subject(s) - proton , raman spectroscopy , conductivity , arrhenius equation , activation energy , alkali metal , chemistry , glass transition , arrhenius plot , hydrogen bond , infrared spectroscopy , proton transport , analytical chemistry (journal) , molecule , organic chemistry , physics , quantum mechanics , optics , polymer
The temperature dependence of proton conductivity in 36HO 1/2 −4NbO 5/2 −2BaO-4LaO 3/2 −4GeO 2 −1BO 3/2 −49PO 5/2 glasses prepared through the alkali-proton substitution method was investigated in this study. The activation energy of proton conduction, E a , 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, 1 H- and 31 P-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.