Shang Wu, Qinzheng Hu, Lan Wu
May 5, 2019
Citations
1
Influential Citations
54
Citations
Journal
Journal of Alloys and Compounds
Abstract
Abstract In this study, the nickel selenide (Ni0.85Se) nanoparticles with uniform size are synthesized in different solvents (glycerol, benzyl alcohol, and 2-phenylethanol) by one-step solvothermal method without any surfactant and template. The specific capacity of the Ni0.85Se nanoparticles prepared in benzyl alcohol is as high as 114.6 mA h g−1 at 1 A g−1 and exhibits a good cycling stability. Moreover, a novel asymmetric supercapacitor (ASC) device is devised and combined by exploiting Ni0.85Se nanoparticles as a positive electrode and activated carbon (AC) as a negative electrode in a safe KOH (2 M) aqueous electrolyte. The Ni0.85Se//AC ASC has an operating voltage reach up to 1.65 V, high energy density of 22.3 Wh kg−1 at a power density of 829 W kg−1 and the capacity can maintain of 76% after 5000 cycles. As a result, the Ni0.85Se nanoparticles synthesized in benzyl alcohol are good candidate electrodes for supercapacitor applications in the energy storage systems.