Insight into graphene/hydroxide compositing mechanism for remarkably enhanced capacity

The interaction between active materials and conductive additives is complicated but crucial within electro-chemical energy storage devices. Here, we first identify that CH2 groups drive the compositing process, leading to an effective formation of Co-O-C chemical bonding serving as the bridge between reduced graphene oxide (rGO) and hydroxide. Due to the enhanced electron transport, a dramatically improved specific capacity is achieved as high as 1368 F/g for rGO/Co(OH)(2) electrode at a current density of 0.5 A/g. Thus, we provide new insights into graphene/hydroxide compositing mechanism, which has a significant impact on enhancing electron transport for a variety of graphene/hydroxide in energy storage systems.