Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7743832 | Journal of Power Sources | 2012 | 6 Pages |
Abstract
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 108 m2 gâ1. 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 224 F gâ1 at charge/discharge current density of 240 A gâ1 within an electrochemical windows of 0.8 V in 3 M KCl aqueous solution. The specific power of RGO-PPy electrodes reaches 38.6 kW kgâ1 when its specific energy reaches 2.5 Wh kgâ1 in 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 30 A gâ1 within an electrochemical windows of 0.8 V after 5000 cycles.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Jingping Wang, Youlong Xu, Jianbo Zhu, Penggang Ren,