%0 Journal Article %T High-performance supercapacitors based on a graphene–activated carbon composite prepared by chemical activation %A Chen, Yao %A Zhang, Xiong %A Zhang, Haitao %A Sun, Xianzhong %A Zhang, Dacheng %A Ma, Yanwei %J RSC Advances %V 2 %N 20 %P 7747-7753 %D 2012-08-14 %I The Royal Society of Chemistry %~ DeepDyve