Electrochemically Stable Carbazole-Derived Polyaniline for Pseudocapacitors
Electrochemically Stable Carbazole-Derived Polyaniline for Pseudocapacitors
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DOI：
10.1021/acsapm.1c01616
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发表时间：
2022-03-15
影响因子：
5
通讯作者：
Scott, Colleen N.
中科院分区：
文献类型：
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作者：
Almtiri, Mohammed;Dowell, Timothy J.;Scott, Colleen N.
超级电容器储能设备由于其高能量和功率密度（即更长的电池寿命和快速充电）和卓越的使用寿命（比锂离子电池长 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。迄今为止，研究工作主要集中在提高这些材料的比电容上。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。为此，我们开发了一种含有咔唑单元与2,5-二甲基对苯二胺（Cbz-PANI-1）共聚的聚苯胺（PANI）衍生物，并测定了其光电性能、导电性、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度，这使得可以使用可扩展的喷涂和滴铸方法来制造电极。 Cbz-PANI-1用于制造超级电容器装置的电极，在0.2 mA cm(-2)的电流密度下，其最大面积电容为64.8 mF cm(-2)，比电容为319 F g(-1)。此外，该电极在 1000 个 CV 循环中表现出优异的循环稳定性（电容保持率约为 83%）。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，该器件在 1000 次充放电循环中还表现出出色的循环稳定性（电容保持率约为 91%）。
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 (approximate to 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 (approximate to 91% of capacitance retention) over 1000 charge-discharge cycles.