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Polypyrrole Films with Micro/Nanosphere Shapes for Electrodes of High-Performance Supercapacitors
ACS Applied Materials & Interfaces ( IF 9.5 ) Pub Date : 2017-09-18 00:00:00 , DOI: 10.1021/acsami.7b11574 JuKyung Lee 1 , Hobin Jeong , Rodrigo Lassarote Lavall 2 , Ahmed Busnaina , Younglae Kim , Yung Joon Jung , HeaYeon Lee 3
ACS Applied Materials & Interfaces ( IF 9.5 ) Pub Date : 2017-09-18 00:00:00 , DOI: 10.1021/acsami.7b11574 JuKyung Lee 1 , Hobin Jeong , Rodrigo Lassarote Lavall 2 , Ahmed Busnaina , Younglae Kim , Yung Joon Jung , HeaYeon Lee 3
Affiliation
We demonstrate a simple and efficient one-step procedure for synthesizing a solid state polypyrrole (PPy) thin film for supercapacitor applications using alternating current impedance spectroscopy. By controlling the frequency and amplitude we were able to create unique PPy nano/microstructures with a particular morphology of the loop. Our PPy micro/nanosphere shows extremely high capacitance of 568 F/g, which is close to the theoretical value of 620 F/g and 20–100% higher than that of other reported PPy electrodes. Most of all, this material presents high capacitance and significantly improved electrochemical stability without pulverization of its structure, demonstrating 77% retention of the capacitance value even after 10 000 charge/discharge cycles. These results are a consequence of the larger surface area and adequate porosity generated due to the balance between the nano/micro PPy loops. This created porous structure also allows the favored penetration of electrolyte and high ion mobility within the polymer and prevents the mechanical failure of the physical structure during volume variation associated with the insertion/deinsertion of ions upon cycling.
中文翻译:
微米/纳米形状的聚吡咯膜,用于高性能超级电容器的电极
我们演示了一种简单高效的一步法程序,可使用交流阻抗谱法为超级电容器应用合成固态聚吡咯(PPy)薄膜。通过控制频率和幅度,我们能够创建具有特定环路形态的独特PPy纳米/微结构。我们的PPy微/纳米球显示出568 F / g的极高电容,接近620 F / g的理论值,比其他报道的PPy电极高20-100%。最重要的是,这种材料具有高电容量并显着改善了电化学稳定性,而没有粉碎其结构,即使在1万次充电/放电循环后,仍显示出77%的电容值保持率。这些结果是由于较大的表面积和由于纳米/微型PPy环之间的平衡而产生的适当孔隙率的结果。这种产生的多孔结构还允许电解质在聚合物内良好地渗透和高的离子迁移率,并防止在与循环时离子的插入/插入相关的体积变化期间物理结构的机械故障。
更新日期:2017-09-19
中文翻译:
微米/纳米形状的聚吡咯膜,用于高性能超级电容器的电极
我们演示了一种简单高效的一步法程序,可使用交流阻抗谱法为超级电容器应用合成固态聚吡咯(PPy)薄膜。通过控制频率和幅度,我们能够创建具有特定环路形态的独特PPy纳米/微结构。我们的PPy微/纳米球显示出568 F / g的极高电容,接近620 F / g的理论值,比其他报道的PPy电极高20-100%。最重要的是,这种材料具有高电容量并显着改善了电化学稳定性,而没有粉碎其结构,即使在1万次充电/放电循环后,仍显示出77%的电容值保持率。这些结果是由于较大的表面积和由于纳米/微型PPy环之间的平衡而产生的适当孔隙率的结果。这种产生的多孔结构还允许电解质在聚合物内良好地渗透和高的离子迁移率,并防止在与循环时离子的插入/插入相关的体积变化期间物理结构的机械故障。