Characteristics of NiO coating on carbon nanotubes for electric double layer capacitor application

► We use vacuum annealing and oxygen plasma treatment to form NiO nano-structures. ► Uniform NiO nano-structures were synthesized on CNTs/carbon cloth. ► The capacitance of NiO/CNTs/carbon cloth electrode can reach up to 162.41 F/g. ► The NiO/CNTs/carbon cloth electrode exhibits great electrochemical properties. ► The synthesized NiO/CNTs/carbon cloth was a potential electrode material.