Electronic channel in 3D flowery Co(OH)2/N-doped graphene composites with Enhanced Electrochemistry Performance

A novel self-assembled flower-like (Co(OH)2)/N-doped graphene composites were prepared using a facile sol-gel process, which shows a high specific capacitance (2276Fg−1 at 1Ag−1) and good capacitance retention rate (83% at 20Ag−1). Moreover, only a 6.5% loss in specific capacitance was observed after more than 2000 cycles (at 10Ag−1). These results suggested that the flowery Co(OH)2 with three-dimensional architectures on N-doped graphene leads to a synergistic performance, which results in enhanced electrochemical performance of the overall system. •A flowery Co(OH)2 was decorated on N-doped graphene via self-assembly method.•An electron tunnel has been built up between graphene and Co(OH)2 by N atoms.•A high N doping content (14.38wt% NC−1=22.6%) was achieved.•The composite electrode delivered specific capacitance of 2276Fg−1 at 1Ag−1.