电化学稳定的咔唑衍生物聚苯胺用于超级电容器的研究《ACS Applied Polymer Materials》

电化学稳定的咔唑衍生物聚苯胺用于超级电容器的研究

摘要

超级电容器储能设备由于其高能量和功率密度（即电池寿命更长和充电速度更快）以及优越的工作寿命（比锂离子电池大10倍），非常适合满足未来便携式消费电子产品（PCE）的严格要求。到目前为止，研究工作仅局限于提高这些材料的比电容；然而，新兴技术对其他标准的竞争性能要求越来越高，包括制造的可扩展性和电化学稳定性。在这方面，我们开发了一种聚苯胺（PANI）衍生物，该衍生物含有一个咔唑单元，与2,5-二甲基对苯二胺（Cbz-PANI-1）共聚，并测定了其光电性能、电导率、加工性能和电化学稳定性。重要的是，该聚合物在各种溶剂中表现出良好的溶解性，这使得可以使用可扩展的喷涂和滴注方法来制造电极。Cbz-PANI-1用于制造超级电容器器件的电极，在0.2 mA cm^–2的电流密度下，最大面积电容为64.8 mF cm^–2，比电容为319 F g^–1。此外，该电极具有良好的循环稳定性(≈ 电容保持率的83%）超过1000 CV循环。此外，我们还展示了Cbz-PANI-1在对称超级电容器器件中的电荷存储性能，该器件还具有优异的循环稳定性(≈ 电容保持率的91%）超过1000次充放电循环。

关键词：聚苯胺、咔唑、导电聚合物、氧化还原聚合物、超级电容器

Electrochemically Stable Carbazole-Derived Polyaniline for Pseudocapacitors

Mohammed Almtiri, Timothy J. Dowell, Hari Giri, David O. Wipf, and Colleen N. Scott*

Department of Chemistry, Mississippi State University, Starkville, Mississippi 39762, United States

ACS Appl. Polym. Mater. 2022, 4, 5, 3088–3097

Publication Date: March 15, 2022

https://doi.org/10.1021/acsapm.1c01616

Abstract

Supercapacitor energy storage devices are well suited to meet the rigorous demands of future portable consumer electronics (PCEs) due to their high energy and power densities (i.e., longer battery-life and rapid charging, respectively) and superior operational lifetimes (10 times greater than lithium-ion batteries). To date, research efforts have been narrowly focused on improving the specific capacitance of these materials; however, emerging technologies are increasingly demanding competitive performance with regards to other criteria, including scalability of fabrication and electrochemical stability. In this regard, we developed a polyaniline (PANI) derivative that contains a carbazole unit copolymerized with 2,5-dimethyl-p-phenylenediamine (Cbz-PANI-1) and determined its optoelectronic properties, electrical conductivity, processability, and electrochemical stability. Importantly, the polymer exhibits good solubility in various solvents, which enables the use of scalable spray-coating and drop-casting methods to fabricate electrodes. Cbz-PANI-1 was used to fabricate electrodes for supercapacitor devices that exhibits a maximum areal capacitance of 64.8 mF cm–2 and specific capacitance of 319 F g–1 at a current density of 0.2 mA cm–2. Moreover, the electrode demonstrates excellent cyclic stability (≈ 83% of capacitance retention) over 1000 CV cycles. Additionally, we demonstrate the charge storage performance of Cbz-PANI-1 in a symmetrical supercapacitor device, which also exhibits excellent cyclic stability (≈ 91% of capacitance retention) over 1000 charge–discharge cycles.

KEYWORDS: polyaniline, carbazole, conducting polymer, redox polymer, supercapacitor

来源：《ACS Applied Polymer Materials》

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