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Updated: Sep 23, 2025
Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework
Published on: April 9, 2018
Modulation of a coordination structure in a europium(iii)-based metallo-supramolecular polymer for high proton
Yemineni S L V Narayana1, Chanchal Chakraborty1, Utpal Rana1
1Electronic Functional Macromolecules Group, National Institute for Material Science (NIMS) Tsukuba 305-0044 Japan HIGUCHI.Masayoshi@nims.go.jp.
Abstract:
Developing high proton conducting solid materials is significant in the field of fuel cells. A europium(iii)-based metallo-supramolecular polymer with uncoordinated carboxylic acids (PolyEu-H) was successfully synthesized by modifying the synthesis conditions. The proton conductivity was enhanced with increasing the relative humidity (RH) from 30 to 95% RH. PolyEu-H showed about 104 times higher proton conductivity than the polymer with coordinated carboxylic acids (PolyEu) and about 400 times higher than the polymer without carboxylic acids (PolyEu-2). The proton conductivity of PolyEu-H reached 4.45 × 10-2 S cm-1 at 95% RH and 25 °C and 5.6 × 10-2 S cm-1 at 75 °C. The activation energy, E a was ultralow (0.04 eV), which indicates proton conduction based on the Grotthuss mechanism. The results indicate that efficient proton conduction occurs through proton channels formed by moisture in PolyEu-H.
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