Li Rebecca L, Lin Cheng-Wei, Shao Yuanlong, Chang Che Wei, Yao Fu-Kai, Kowal Matthew D, Wang Haosen, Yeung Michael T, Huang Shu-Chuan, Kaner Richard B
Department of Chemistry and Biochemistry and California NanoSystems Institute, University of California, Los Angeles, CA 90095, USA.
Cambridge Graphene Centre, Cambridge University, Cambridge CB3 0FA, UK.
Polymers (Basel). 2016 Nov 15;8(11):401. doi: 10.3390/polym8110401.
By combining electrochemical experiments with mass spectrometric analysis, it is found that using short chain oligomers to improve the cycling stability of conducting polymers in supercapacitors is still problematic. Cycling tests via cyclic voltammetry over a potential window of 0 to 1.0 V or 0 to 1.2 V in a two-electrode device configuration resulted in solid-state electropolymerization and chain scission. Electropolymerization of the aniline tetramer to generate long chain oligomers is shown to be possible despite the suggested decrease in reactivity and increase in intermediate stability with longer oligomers. Because aniline oligomers are more stable towards reductive cycling when compared to oxidative cycling, future conducting polymer/oligomer-based pseudocapacitors should consider using an asymmetric electrode configuration.
通过将电化学实验与质谱分析相结合，发现使用短链低聚物来提高超级电容器中导电聚合物的循环稳定性仍然存在问题。在两电极装置配置中，通过循环伏安法在0至1.0 V或0至1.2 V的电位窗口上进行循环测试，导致了固态电聚合和链断裂。尽管随着低聚物长度增加，反应活性有所降低且中间体稳定性有所增加，但已表明苯胺四聚体的电聚合可生成长链低聚物。由于与氧化循环相比，苯胺低聚物对还原循环更稳定，未来基于导电聚合物/低聚物的赝电容器应考虑使用不对称电极配置。
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