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Symmetric electrochemical capacitor based on PPy obtained via MnO2 reactive template synthesis
Synthetic Metals ( IF 4.4 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.synthmet.2020.116541
Carlos Bellaner Díaz-Arriaga , José Martín Baas-López , Daniella Esperanza Pacheco-Catalán , Jorge Uribe-Calderon

Abstract The present work explores the synthesis of sulphate-polypyrrole (PPy/SO42−) using MnO2 as a reactive template. Samples were characterized by different techniques, including SEM, CHNS, XRD, and XPS, which confirmed that MnO2 acted as a reactive template during PPy synthesis. The materials obtained were characterized by cyclic voltammetry and electrochemical impedance spectroscopy techniques to evaluate their electrochemical properties as electrodes for electrochemical capacitors (ECs electrodes). Py50/M50 electrode exhibited the highest specific capacitance value being 1215 mF cm−2 (or 125 F g−1) at 5 mV s−1. According to PEIS analysis, the enhancement of capacitive performance is attributed to the elongated shape morphology of Py50/M50 electrode that improves the ionic diffusion and reduces the charge transfer resistance on its surface. Furthermore, a symmetric ECs assembly using two identical pieces of Py50/M50 electrodes exhibited a maximum areal energy and power density of 13.5 mW h cm −2 and 324 mW cm−2, respectively. These results suggest a new route of synthesis of PPy/SO42− with elongated shape morphology to produce electrodes for ECs with high electrochemical performance.

中文翻译:

基于 PPy 的对称电化学电容器通过 MnO2 反应模板合成获得

摘要 本工作探索了使用 MnO2 作为反应模板合成硫酸盐聚吡咯 (PPy/SO42−)。样品通过不同的技术进行表征,包括 SEM、CHNS、XRD 和 XPS,这证实了 MnO2 在 PPy 合成过程中充当了反应模板。获得的材料通过循环伏安法和电化学阻抗谱技术进行表征,以评估它们作为电化学电容器电极(ECs 电极)的电化学性能。Py50/M50 电极在 5 mV s-1 下表现出最高的比电容值为 1215 mF cm-2(或 125 F g-1)。根据PEIS分析,电容性能的增强归因于Py50/M50电极的细长形状形态,其改善了离子扩散并降低了其表面的电荷转移电阻。此外,使用两块相同的 Py50/M50 电极的对称 ECs 组件表现出的最大面积能量和功率密度分别为 13.5 mW h cm -2 和 324 mW cm-2。这些结果表明了一种合成具有细长形状形态的 PPy/SO42− 的新途径,以生产具有高电化学性能的 ECs 电极。
更新日期:2020-11-01
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