在p型有机混合离子电子导体中的定量组成和中等尺度离子分布
Ruiheng Wu1, Bryan D Paulsen2, Qing Ma3
1Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States.
ACS applied materials & interfaces
|June 16, 2023
概括
本研究使用先进的X射线技术量化有机导体 (OMIEC) 中的离子组成. 研究结果揭示了离子运输和分布如何影响材料特性,这对设备开发至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 聚合物科学 聚合物科学
背景情况:
- 了解有机混合离子电子导体 (OMIEC) 中的离子组成和分布,对于结构-性质关系至关重要.
- 对OMIEC离子组成和分布的直接测量是有限的.
- 这项工作研究了三种典型的p型OMIEC材料,具有不同的固定离子电荷.
研究的目的:
- 为了研究三种p型OMIEC材料的离子组成和中镜结构.
- 在电解质暴露和电化学循环后描述OMIEC.
- 为了澄清离子行为和材料特性之间的关系.
主要方法:
- 利用了X射线光 (XRF),X射线光电子光谱,重量计,煤度计,以及放牧发生小角度X射线散射 (GISAXS).
- XRF提供了定量离子到单体化合物.
- 在纳米尺度上,GISAXS揭示了离子分离.
主要成果:
- 通过XRF进行量化离子对单体组合,显示被动和潜在驱动的离子吸收/驱逐.
- 在EG/GOPS-PEDOT:PSS中确认了单运输,由于Donnan排除.
- 在crys-PEDOT:PSS中证明了混合离子/离子运输,在pg2T-TT中显著的离子捕获.
结论:
- 建立了固定离子电荷密度和多南排斥强度之间的直接联系.
- 在不同的OMIEC中揭示了不同的离子运输机制和分离模式.
- 为准确的结构-属性连接提供了对OMIEC离子行为的关键见解.
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