Facile One-Step Microwave-Assisted Method to Synthesize Nickel Selenide Nanosheets for High-Performance Hybrid Supercapacitor

Nanosheets structures can be employed as the most promising electrode material to enhance electrochemical performance for supercapacitors. Nickel Selenide (Ni0.85Se) nanosheets are synthesized using a rapid microwave synthesis method in a single step. The Ni0.85Se nanosheets possess a high surface area (125 m(2)g(-1)) with a hexagonal crystalline structure. It shows magnificent electrochemical properties, such as splendid specific capacitance (2530 Fg(-1) at 0.5 Ag-1). An asymmetric hybrid supercapacitor is fabricated with nickel selenide nanosheets as a positive electrode and activated carbon as a negative electrode. The assembled hybrid supercapacitor displays a high energy density of 63.5 WhKg(-1) at a power density of 404 WKg(-1), and after 8000 cycles, only 5% capacitance is lost along with the better voltage window at 0-1.6 V. (C) 2021 Elsevier Inc. All rights reserved.

Automated summary

Utilizing nickel selenide nanosheets as electrode material enhances electrochemical performance for supercapacitors with high surface area and hexagonal structure. The assembled hybrid supercapacitor shows high energy density and maintains excellent capacitance performance even after 8000 cycles.