Affiliation:
1. Department of Chemistry, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601 , Japan
Abstract
Abstract
The development of molecular proton conductors has garnered considerable attention owing to their potential for use as solid-state electrolytes for fuel cells. Creating hydrogen-bonding networks between HIm (imidazole) and carboxylate is an attractive approach for constructing efficient proton conducting pathways. Herein, high proton conduction in a new hydrogen-bonded molecular crystal of [RuII(HIm)6](Glu)·4H2O (1·4H2O, H2Glu = glutaric acid) is demonstrated. 1·4H2O exhibited a proton conductivity of 1.33 × 10−4 S cm−1 at 318 K and 100% relative humidity. This is attributed to a three-dimensional (3D) hydrogen-bonding network via hydrogen-bonding between HIm and carboxylate group and water molecules, leading to produce a one-dimensional (1D) hydrogen-bonding water chain, which provides a proton conducting pathway. The calculated activation energy (Ea) value was 0.38 eV at 283–318 K, suggesting that proton transport in 1·4H2O is associated with the Grotthuss mechanism. The hydrogen-bonding networks between HIm and carboxylate may play a role to promote the proton hopping mechanism. This study will provide new molecular proton conductors using imidazole metal complexes.
Publisher
Oxford University Press (OUP)
Cited by
2 articles.
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