Transition metal hydroxides and graphene composite holds great promise to be the next generation of high performance electrode material for energy storage applications. Here we fabricate the cypress leaf-like Cu(OH)
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nanostructure/graphene nanosheets composite through one-step in situ synthesis process, employed as a new type of electrode material for high efficiency electrochemical energy storage in supercapacitors. A solution-based two-electrode system is applied to synthesize Cu(OH)
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/graphene hybrid nanostructure, where anodic graphene nanosheets firmly anchor cathodic Cu(OH)
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nanostructure due to the electrostatic interaction. The in situ self-assembly of Cu(OH)
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/graphene ensures good structural robustness and the cypress leaf-like Cu(OH)
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nanostructure prompt to form the open and porous morphology. The hybrid structure would facilitate charge transport and effectively mitigate the volume changes during long-term charging/discharging cycles. As a consequence, the Cu(OH)
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/graphene composite exhibits the highest capacitance of 317 mF/cm
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at the current density of 1 mA/cm
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and superior cyclic stability with no capacitance decay over 20,000 cycles and remarkable rate capability at increased current densities.
High-performance supercapacitors are very desirable for many portable electronic devices, electric vehicles and high-power electronic devices. Herein, a facile and binder-free synthesis method, galvanic displacement of the precursor followed by heat treatment, is used to fabricate ultrathin CoO nanosheet arrays on nickel foam substrate. When used as a supercapacitor electrode the prepared CoO on nickel foam exhibits a maximum specific capacitance of 1095 F g at a current density of 1 A g and good cycling stability of 71% retention after 2000 cycling tests. This excellent electrochemical performance can be ascribed to the high specific surface area of each CoO nanosheet that comprises numerous nanoparticles.
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