【摘要】 利用电化学合成和化学还原方法制备了超级电容器用聚吡咯/石墨烯(PPy/GNs)复合电极材料,分别对比了恒电流和脉冲电流条件下石墨烯对电极材料电化学性能的影响,断口形貌及电性能测试结果表明,石墨烯因其良好的导电性能可有效提高电极的比容量,与聚吡咯(PPy)相比,恒电流制备的PPy/GNs(DC-PPy/GNs)电极比容量提高了13.5%。另外发现,脉冲电流制备的PPy/GNs(PC-PPy/GNs)超级电容器具有更大的比容量和更好的循环稳定性。导通时间为100ms时,PC-PPy/GNs复合电极材料在100mV/s的扫描速率下比容量可达280F/g。更多还原

【Abstract】 Polypyrrole(PPy) and polypyrrole/graphene(PPy/GNs) electrode composites were prepared via electrochemical polymerization and chemical reduction from pyrrole(Py) and GO(graphite oxide).Fracture morphology and electric performance of the composites were characterized by scanning electron microscope and VMP2 electrochemical workstation.It is found that the specific capacitance of PPy/GNs composite electrode synthesized by direct current is 13.5% higher than that of polypyrrole electrode.Comparison of electrochemical performance between PPy and PPy/GNs composites indicates that the PPy/GNs composite synthesized by pulse current(PC) have higher capacitance and better rate capability than that of direct current(DC).The specific capacitance can reach to 280F/g at the 100mV/s scanning rate.更多还原