NDLI: Imidazolium methanesulfonate as a high temperature proton conductor

Content Provider	Royal Society of Chemistry (RSC)
Author	Conrad, Olaf Luo, Jiangshui Vankelecom, Ivo F. J.
Copyright Year	2013
Abstract	Imidazolium methanesulfonate (1) has been studied as a model proton conductor for high temperature polymer electrolyte membrane fuel cells (PEMFCs). It is found that 1 undergoes transformation from crystalline to plastic crystalline and then molten states successively from ambient temperature to 200 °C. The solid–solid phase transition of 1 at 174 °C has been preliminarily verified by differential scanning calorimetry (DSC) and temperature-dependent X-ray diffraction (XRD). At the melting point of 188 °C, 1 displays a low entropy of fusion of around 24 J mol−1 K−1. In particular, a high ionic conductivity of 1.0 × 10−2 S cm−1 is reached at 185 °C in the plastic phase. The activation energy for ionic conduction decreases as 1 is heated from the crystal phase to the melt phase. In the molten state, the contribution of protons to the ionic conductivity of 1 was corroborated electrochemically. In addition, 1 is electrochemically active for H2 oxidation and O2 reduction at a Pt electrode while it shows a high electrochemical window of 2.0 V. Furthermore, a Nafion® membrane has been successfully doped with 1, as identified by infrared spectroscopy, powder XRD, grazing incidence XRD and thermogravimetric analysis. To the best of our knowledge, this may be the first report on a protic organic ionic plastic crystal (OIPC) consisting of protonated imidazole (C3H5N2+) and an organic anion. The good thermal stability, high ionic conductivity, wide electrochemical window, favorable plastic crystal behavior and simple synthesis make 1 a highly interesting model proton conductor for high temperature PEMFCs.
Starting Page	2238
Ending Page	2247
Page Count	10
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	1
Issue Number	6
Journal	Journal of Materials Chemistry A
DOI	10.1039/c2ta00713d
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	DSC Proton conductor Proton-exchange membrane Phase transition Differential scanning calorimetry X-ray crystallography Entropy Activation energy Oxygen Electrode Electrochemical window Nafion Infrared spectroscopy Angle of incidence (optics) Thermogravimetric analysis Plastic crystal Imidazole Ion
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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