Controlled synthesis of three-phase NixSy/rGO nanoflake electrodes for hybrid supercapacitors with high energy and power density. (March 2017)

• Record Type: Journal Article
• Authors: Dai, Shuge; Zhao, Bote; Qu, Chong; Chen, Dongchang; Dang, Dai; Song, Bo; deGlee, Ben M.; Fu, Jianwei; Hu, Chenguo; Wong, Ching-Ping; Liu, Meilin
• Is Part Of: Nano energy. Volume 33(2017:Mar.)
• Page Start: 522
• Page End: 531
• Publication Date: 2017-03
• Subjects: Graphene -- Composites -- Multiphase -- Supercapacitors -- Sulfides; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2017.01.056
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Composition design and morphology control of electrode materials are effective strategies to enhance the specific capacity, rate capability, and cycling life of electrochemical energy storage devices. Here we report our findings in the design and synthesis of a three-phase nickel sulfide (NiS-Ni3 S2 -Ni3 S4, denoted as TP-Nix Sy ) with 3D flower-like architecture assembled from interconnected nanoflakes, which delivers a specific capacity of 724 C g −1 at a current density of 1 A g −1 . When integrated with reduced graphene oxide (rGO), a TP-Nix Sy /rGO composite electrode, derived from a hydrothermal process, demonstrates not only higher specific capacity (807 C g −1 at 1 A g −1 ) but also better rate capability (~72% capacity retention as the current density was increased from 1 to 20 A g −1 ). Moreover, a hybrid energy storage device, constructed from a TP-Nix Sy /rGO positive electrode and a graphene-based negative electrode, shows a high energy density of 46 Wh kg −1 at a power density of 1.8 kW kg −1 . It retains an energy density of 32 Wh kg −1 at power density of 17.2 kW kg −1, demonstrating its viability and potential for practical applications. Graphical abstract: A three-phase nickel sulfide (NiS-Ni3 S2 -Ni3 S4 )/reduced graphene oxide was designed and successfully prepared, which delivered high specific capacity (807 C g −1 at 1 A g −1 ), and good rate capability. Importantly, a hybrid supercapacitor device was also fabricated based on the nickel sulfide/graphene positive electrode and graphene negative electrode, which demonstrated a high energy density and good cycling stability. Two such devices connected in series could power 37 commercial LEDs, demonstrating its great potential application in energy storage systems.fx1 Highlights: Three-phase nickel sulfide (NiS-Ni3 S2 -Ni3 S4 ) with 3D flower-like architecture was successfully prepared. The TP-Nix Sy /rGO hybrid electrode was successfully prepared, delivering high capacity and excellent rate capability. The TP-Nix Sy /rGO//graphene hybrid supercapacitor achieved a remarkable energy density and retained a high energy density at high power density.