Hydrous nickel sulphide nanoparticle decorated 3D graphene foam electrodes for enhanced supercapacitive performance of an asymmetric deviceElectronic supplementary information (ESI) available: CV of Ni9S8 and activated carbon, literature table of nickel sulfide. See DOI: 10.1039/c8nj04228d

• Main Authors: Patil, Umakant M, Katkar, Pranav K, Marje, Supriya J, Lokhande, Chandrakant D, Jun, Seong C
• Format: Article
• Language: English
• ISSN: 1144-0546; 1369-9261
• DOI: 10.1039/c8nj04228d

Hydrous nickel sulphide is successfully synthesized on graphene foam (Ni 9 S 8 /GF) using a facile chemical bath deposition (CBD) method. The physico-chemical properties (XRD, RAMAN, FE-SEM and TEM) show that hydrous nanocrystalline Ni 9 S 8 particles are uniformly distributed over the surface of multilayered graphene foam (MGF). The electrochemical capacitive measurement results reveal that the Ni 9 S 8 /GF 3D porous electrode exhibits high specific capacitance of 2055 F g −1 at 2 A g −1 . Moreover, an asymmetric supercapacitor fabricated using the Ni 9 S 8 /GF electrode as the positive electrode and activated carbon (AC/NF) as a negative electrode shows a high energy density of 51.11 W h kg −1 at a power density of 2.66 kW kg −1 . The enhanced capacitive performance of an ACS device can be attributed to the introduction of Ni 9 S 8 /GF, since 3D GF offers a porous structure with high specific surface area and continuous conducting structure, which possesses more active sites for charge storage and assists fast charge transport through the continuous 3D graphene structure. Hydrous nickel sulphide is successfully synthesized on graphene foam (Ni 9 S 8 /GF) using a facile chemical bath deposition (CBD) method for supercapacitor application.