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在合聚合物中的孔限电化学兴奋剂

Scott T Keene^1,2, Joonatan E M Laulainen³, Raj Pandya^4,5

¹Electrical Engineering Division, Department of Engineering, University of Cambridge, Cambridge, UK. stk30@cam.ac.uk.

Nature materials

|July 6, 2023

概括

结合聚合物的电化学兴奋剂并不总是受到离子运动的限制. 漏洞运输不良可能会减缓开关速度,但可以通过控制材料结构来改善这种情况.

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:

同时的离子和电子电荷传输对于电化学设备至关重要.
在混合导体中,对离子和电子传输之间的相互作用的理解是有限的.
目前的假设表明,离子流动性限制了半导体电极中的电化学兴奋剂.

研究的目的:

调查结合聚合物电极中限制电化学兴奋速度的因素.
挑战离子运动是兴奋剂的唯一限制因素的假设.
确定提高联聚合物的电化学性能的策略.

主要方法:

运行光学显微镜被用来研究兴奋剂动态.
调查的重点是一个最先进的聚乙烯电极.
分析与微观结构异质性相关联的兴奋剂速度.

主要成果:

结合聚合物中的电化学兴奋剂可以通过孔运输来限制,特别是在低兴奋剂水平时.
这种受孔限制的传输导致的切换速度比离子移动性受限模型预测的要慢.
发现微观结构异质性的程度会影响洞局限性兴奋剂的时间尺度.

结论:

假设离子运动限制兴奋剂的假设并不普遍适用于合聚合物.
孔运输动力学在这些材料的电化学性能中起着重要作用.
量身定制微观结构异质性为设计结合聚合物提供了一条途径,可以提高兴奋剂的速度和设备性能.

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