Song Charles Kiseok, Eckstein Brian J, Tam Teck Lip Dexter, Trahey Lynn, Marks Tobin J
Department of Chemistry, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208, United States.
ACS Appl Mater Interfaces. 2014 Nov 12;6(21):19347-54. doi: 10.1021/am505416m. Epub 2014 Nov 3.
The ionization potentials (IPs) and electron affinities (EAs) of widely used conjugated polymers are evaluated by cyclic voltammetry (CV) in conventional electrochemical and lithium-ion battery media, and also by ultraviolet photoelectron spectroscopy (UPS) in vacuo. By comparing the data obtained in the different systems, it is found that the IPs of the conjugated polymer films determined by conventional CV (IPC) can be correlated with UPS-measured HOMO energy levels (EH,UPS) by the relationship EH,UPS = (1.14 ± 0.23) × qIPC + (4.62 ± 0.10) eV, where q is the electron charge. It is also found that the EAs of the conjugated polymer films measured via CV in conventional (EAC) and Li(+) battery (EAB) media can be linearly correlated by the relationship EAB = (1.07 ± 0.13) × EAC + (2.84 ± 0.22) V. The slopes and intercepts of these equations can be correlated with the dielectric constants of the polymer film environments and the redox potentials of the reference electrodes, as modified by the surrounding electrolyte, respectively.
在传统电化学和锂离子电池介质中，通过循环伏安法（CV）评估了广泛使用的共轭聚合物的电离电位（IPs）和电子亲和势（EAs），同时在真空中通过紫外光电子能谱（UPS）进行了评估。通过比较在不同体系中获得的数据，发现通过传统CV测定的共轭聚合物薄膜的IPs（IPC）与UPS测量的最高占据分子轨道能级（EH,UPS）之间存在如下关系：EH,UPS = (1.14 ± 0.23) × qIPC + (4.62 ± 0.10) eV，其中q为电子电荷。还发现，在传统（EAC）和锂离子电池（EAB）介质中通过CV测量的共轭聚合物薄膜的EAs之间存在线性关系：EAB = (1.07 ± 0.13) × EAC + (2.84 ± 0.22) V。这些方程的斜率和截距分别与聚合物薄膜环境的介电常数以及经周围电解质修正的参比电极的氧化还原电位相关。
