Abstract:
Nickel-oxide-Carbon nanotube (NiO-CNT) composite has been synthesized and its multifunctional
electrochemical properties have been demonstrated by investigating the supercapacitive performance
and the oxygen evolution reactivity. The composite exhibits interlinked porous structure and offers high
surface area which has been observed by X-ray diffraction, Field emission scanning electron microscopy,
Transmission electron microscopy and Brunauer-Emmett-Teller surface area analysis. NiO-CNT com posite offers a specific capacitance of 878.19 F g 1 at a scan rate of 2 mV s 1 along with high cyclic sta bility. Asymmetric supercapacitor has been fabricated with the composite material as positive electrode
and activated carbon as negative electrode and 1 M Na2SO4 electrolyte medium. The device offers a
specific capacitance of 197.7 F g 1 at a scan rate of 2 mV s 1
. It exhibits specific energy and specific power
85.7 Wh kg 1 and 11.2 kW kg 1
, respectively. The device is capable of powering LED and DC motor for
several minutes. Moreover, NiO-CNT composite shows excellent activity as a catalyst for Oxygen Evo lution Reaction. The composite offers an overpotential of 0.301 V. The material shows excellent long term
performance. This multifunctional composite material is a promising candidate for future applications in
energy storage and conversion.
