Hollow NiCo2O4 nano-spheres obtained by ultrasonic spray pyrolysis method with superior electrochemical performance for lithium-ion batteries and supercapacitors

The hollow NiCo2O4 nano-spheres (similar to 300-500 nm) are synthesized by ultrasonic spray pyrolysis method and used as electrode for high-performance supercapacitor (SC) and lithium-ion battery (LIB). When used in SC application, the hollow NiCo2O4 deliver a specific capacitance of similar to 1000 F g(-1) even after 3000 charge-discharge cycles. In addition, as an anode material for LIBs, it exhibits admirable high capacity values of 763 and 516 mAh g(-1) after 1000 cycles at a current density of 1500 and 3000 mAh g(-1), respectively. The excellent electrochemical performance of this hollow NiCo2O4 nano-sphere indicates its potential applications for next generation SCs and LIBs. (C) 2017 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.