Electrochemical in situ polymerization of reduced graphene oxide/polypyrrole composite with high power density

Electrochemical in situ polymerization of reduced graphene oxide/polypyrrole composite with high power density
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高功率密度还原氧化石墨烯/聚吡咯复合材料的电化学原位聚合

DOI:
10.1016/j.jpowsour.2012.02.018
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发表时间:
2012-06
影响因子:
9.2
通讯作者:
Ren, Penggang
Ren, Penggang
中科院分区:
工程技术2区
文献类型:
--
作者:
Wang, Jingping;Xu, Youlong;Zhu, Jianbo;Ren, Penggang

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我们展示了一种原位恒流聚合的新方法,用于制备超级电容器电极的还原氧化石墨烯(RGO)/聚吡咯复合材料(RGO - ppy)。PPy与RGO相互作用密切,形成具有多孔结构的复合材料。RGO-PPy的BET比表面积达到108m2g−1。RGO - PPy复合材料在聚吡咯(PPy)环上具有较高的质子化水平(41.1%),这可能与RGO薄片中的含氧基团掺杂了PPy有关。RGO-PPy电极具有良好的电化学性能。在3M KCl水溶液中,在0.8V的电化学窗口内,RGO-PPy电极的比电容仍然达到224Fg−1at,充放电电流密度为240Ag−1。在双电极电池中,当RGO-PPy电极的比能量达到2.5Whkg - 1时,其比功率达到38.6kWkg - 1。RGO-PPy电极具有良好的循环稳定性,在30Ag−1的充放电电流下,在0.8V的电化学窗口内循环5000次后,比电容衰减小于17%。
We demonstrate a novel method of in situ galvanostatic polymerization to prepare reduced graphene oxide (RGO)/polypyrrole composite (RGO–PPy) for supercapacitors electrode. The PPy and the RGO interact closely and form the composite with porous structure. The BET specific surface area of RGO–PPy reaches 108m2g−1. The RGO–PPy composites show the high protonation level on polypyrrole (PPy) ring (41.1%), which can be related to the doping of PPy by oxygen-containing groups in RGO sheet. The RGO–PPy electrodes exhibit good electrochemical performance. The specific capacitance of RGO–PPy electrodes still reaches 224Fg−1at charge/discharge current density of 240Ag−1within an electrochemical windows of 0.8V in 3M KCl aqueous solution. The specific power of RGO–PPy electrodes reaches 38.6kWkg−1when its specific energy reaches 2.5Whkg−1in two-electrode cell. The RGO–PPy electrodes have good cycle stability and show less than 17% specific capacitance decay at a charge/discharge current of 30Ag−1within an electrochemical windows of 0.8V after 5000 cycles.
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