Tumacder Doebner Von, Minisy Islam M, Taboubi Oumayma, Bober Patrycja
Institute of Macromolecular Chemistry, Czech Academy of Sciences, 162 00 Prague, Czech Republic.
Faculty of Science, Charles University, 128 43 Prague, Czech Republic.
Polymers (Basel). 2023 Oct 18;15(20):4140. doi: 10.3390/polym15204140.
The polymerization of pyrrole in the frozen state with the presence of organic dyes (methyl orange (MO) and Acid Blue 25 (AB)) has proven to produce polypyrrole (PPy) nanostructures. Herein, we explore the electrochemical properties of PPy prepared under frozen-state conditions (-24 °C) with and without the presence of organic dyes. The electroactivity of PPy prepared with MO and AB significantly increased in all electrolytic media with a capacitance higher than this of the PPy prepared at room temperature. The highest capacitance (1914 F g) was obtained for PPy-MO in 0.2 M HCl solution. The impedance spectra of PPy showed a decrease in charge transfer resistance when the dyes were present. This indicates a conductivity increase of PPy. Improved electrochemical stability was observed for PPy, PPy-MO, and PPy-AB prepared at -24 °C, wherein a steady gain of capacitance was maintained during 5000 potential cycling. In addition, a PPy-based supercapacitor device was fabricated to demonstrate the energy storage characteristics of PPy, where it showed good capacitive behavior and stability. Overall, frozen-state polymerized PPy posed an impressive capacitive performance for flexible supercapacitors.
已证实，在有机染料（甲基橙（MO）和酸性蓝25（AB））存在的情况下，吡咯在冷冻状态下聚合可生成聚吡咯（PPy）纳米结构。在此，我们探究了在有或没有有机染料存在的冷冻状态条件下（-24℃）制备的PPy的电化学性质。在所有电解介质中，用MO和AB制备的PPy的电活性显著提高，其电容高于在室温下制备的PPy的电容。在0.2 M HCl溶液中，PPy-MO获得了最高电容（1914 F g）。PPy的阻抗谱表明，当存在染料时，电荷转移电阻降低。这表明PPy的电导率增加。观察到在-24℃下制备的PPy、PPy-MO和PPy-AB具有改善的电化学稳定性，其中在5000次电位循环期间电容保持稳定增加。此外，制备了一种基于PPy的超级电容器装置，以展示PPy的储能特性，该装置表现出良好的电容行为和稳定性。总体而言，冷冻状态聚合的PPy对柔性超级电容器具有令人印象深刻的电容性能。
