High mobility I− / I3− redox couple in a molecular plastic crystal: A potential new generation of electrolyte for solid-state photoelectrochemical cells
- 作者：Qing Dai ; Douglas R. MacFarlane and Maria Forsyth
- 关键词：Solid electrolyte ; Diffusion ; Iodide/tri-iodide ; Ionic conductivity and plastic crystal
- 刊名：Solid State Ionics
- 出版年：2006
- 期刊代码：96_01672738
- 类别：ch
- 出版时间：31 January 2006
- 卷：177
- 期：3-4
- 页码：395-401
- 文件大小：176 K
摘要
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.