Core-shell CoMoO4@Ni(OH)2 on ordered macro-porous electrode plate for high-performance supercapacitor

The mechanism, effects, and electrochemical performance of core-shell CoMoO4/Ni(OH)2 nanocomposites coated on surface and sidewall of OMEP fabricated hydrothermally are investigated. The CoMoO4/Ni(OH)2/OMEP has a much higher specific capacitance than the nickel-covered OMEP or CoMoO4/Ni(OH)2 on 2D nickel plate due to the regular macroporus nano-structure with a large specific surface area and faster redox reaction. The highest area (specific) capacitance of 8.55 F cm−2 (1812.42 F g−1) is achieved at a current density of 2 mA cm−2 and excellent electrochemical stability is observed up to 5000 cycles at a current density of 50 mA cm−2. The asymmetrical supercapacitor device composed of CoMoO4@Ni(OH)2/OMEP//AC delivers higher specific energy densities and excellent cycling stability. The core-shell CoMoO4@Ni(OH)2 composite materials are promising and bridge the gap between traditional NI-MH battery and power generation energy storage devices.337