Activated graphene nanosheets/spinule-like Ni(OH)2 composite as cathode materials for high performance supercapacitors

AGNSs/spinule-like Ni(OH)2 composite was prepared by a simple controllable complex-precipitation method. The structure of AGNSs/spinule-like Ni(OH)2 composite helps the spinule-like Ni(OH)2 and AGNSs to achieve a strong affinity, which leads to strong synthetic effects between both materials. AGNSs/spinule-like Ni(OH)2 composite exhibit a high energy density (87.7 Wh Kg−1at power density of 351 W kg−1) and excellent cycle life (1499 F g−1 after 5000 cycles at a current density of 10 A g−1).193