Ni(OH)2 nanodot-decorated Co-Co LDH/C hollow nanocages for a high performance supercapacitor

A novel Co-Co LDH/C/Ni(OH)(2) nanostructure was constructed by loading Ni(OH)(2) nanodots on hollow Co-Co LDH/C nanocages derived from MOFs. The Co-Co LDH/C/Ni(OH)(2) nanostructure revealed a high specific capacitance of up to 1426 F g(-1) at 1 A g(-1) and an outstanding rate capability with 90.2% retention at 10 A g(-1) owing to the cooperative effect of the Ni(OH)(2) nanodots and hollow Co-Co LDH/C nanocages. The electrochemical kinetic analysis showed that the Co-Co LDH/C/Ni(OH)(2) electrode was dominated by surface capacitance control, demonstrating the origins of performance improvement. This work may provide an effective strategy by combining nanodots with hollow porous structures for low-cost and efficient energy storage materials.