High mobility I? / I3? redox couple in a molecular plastic crystal: A potential new generation of electrolyte for solid-state photoelectrochemical cells |
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| Institution: | 1. School of Chemistry, Monash University, Melbourne, Victoria 3800, Australia;2. School of Materials Engineering, Monash University, Melbourne, Victoria 3800, Australia;1. Chemistry and Pharmaceutical Engineering College, Nanyang Normal University, Nanyang, Henan 473061, PR China;2. Jiangsu Key Laboratory for Nano Technology, Eco-Materials and Renewable Energy Research Center (ERERC), Nanjing University, Nanjing, Jiangsu 210093, PR China;3. Kunshan Innovation Institute of Nanjing University, Kunshan, Jiangsu 215300, PR China;1. Institut für Anorganische Chemie, Universität Stuttgart, 70569, Stuttgart, Germany;2. Brand Laborgeräte GmbH & Co KG, P.O. Box 1155, 97861, Wertheim, Germany;1. Department of Chemical and Materials Engineering, National Central University, Taoyuan 32001, Taiwan;2. Research Center for New Generation Photovolatics, National Central University, Taoyuan 32001, Taiwan;3. Electroorganic Division, Central Electrochemical Research Institute, Karaikudi 630 006, Tamil Nadu, India |
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| Abstract: | A series of new electrolyte materials based on a molecular plastic crystal doped by different iodide salts together with iodine have been prepared and characterized by thermal analysis, ionic conductivity, electrochemical and solid-state NMR diffusion measurements. In these materials, the plastic crystal phase of succinonitrile acts as a good matrix for the quaternary ammonium based iodides and iodine and appears to act in some cases as a solid-state “solvent” for the binary dopants. The materials were prepared by mixing the components in the molten state with subsequent cooling into the plastic crystalline state. This resulted in waxy-solid electrolytes in the temperature range from ? 40 to 60 °C. The combination of structural variation of the cations, and fast redox couple diffusion (comparable with liquid-based electrolytes), as well as a high ionic conductivity of up to 3 × 10? 3 S cm? 1 at ambient temperature, make these materials very attractive for potential use in solid-state photoelectrochemical cells. |
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