Three dimensional vanadium pentoxide/graphene foam composite as positive electrode for high performance asymmetric electrochemical supercapacitor.

The electrochemical performance of hydrothermal synthesized three dimensional (3D) orthorhombic vanadium pentoxide (VO) nanosheets and vanadium pentoxide/graphene foam (VO/GF) composites at different mass loading of GF were successfully studied. The optimized VO/GF-150 mg composite provided a high specific capacity of 73 mA h g, which was much higher than that the pristine VO (60 mA h g) nanosheets at a specific current of 1 A g. A hybrid capacitor was also fabricated by adopting a carbon-based negative electrode obtained from the pyrolysis of an iron-PANI polymer (C-Fe/PANI) mixture and the 3D VO/GF-150 mg composite as the positive electrode in 6 M KOH electrolyte.

Correction: A high energy density asymmetric supercapacitor utilizing a nickel phosphate/graphene foam composite as the cathode and carbonized iron cations adsorbed onto polyaniline as the anode.

[This corrects the article DOI: 10.1039/C7RA12028A.].

A high energy density asymmetric supercapacitor utilizing a nickel phosphate/graphene foam composite as the cathode and carbonized iron cations adsorbed onto polyaniline as the anode.

This work presents the effect of different contents of graphene foam (GF) on the electrochemical capacitance of nickel phosphate Ni(PO) nano-rods as an electrode material for hybrid electrochemical energy storage device applications. Pristine Ni(PO) nano-rods and Ni(PO)/GF composites with different GF mass loadings of 30, 60, 90 and 120 mg were synthesised a hydrothermal method. The electrochemical behavior of pristine Ni(PO) and Ni(PO)/GF composites were analysed in a three-electrode cell configuration using 6 M KOH electrolyte.

Hydrothermal synthesis of manganese phosphate/graphene foam composite for electrochemical supercapacitor applications.

Manganese phosphate (Mn(PO) hexagonal micro-rods and (Mn(PO) with different graphene foam (GF) mass loading up to 150mg were prepared by facile hydrothermal method. The characterization of the as-prepared samples proved the successful synthesis of Mn(PO) hexagonal micro-rods and Mn(PO)/GF composites. It was observed that the specific capacitance of Mn(PO)/GF composites with different GF mass loading increases with mass loading up to 100mg, and then decreases with increasing mass loading up to 150mg.

High performance asymmetric supercapacitor based on molybdenum disulphide/graphene foam and activated carbon from expanded graphite.

Molybdenum disulphide which has a graphene-like single layer structure has excellent mechanical and electrical properties and unique morphology, which might be used with graphene foam as composite in supercapacitor applications. In this work, Molybdenum disulphide (MoS)/graphene foam (GF) composites with different graphene foam loading were synthesized by the hydrothermal process to improve on specific capacitance of the composites. Asymmetric supercapacitor device was fabricated using the best performing MoS/GF composite and activated carbon derived from expanded graphite (AEG) as positive and negative electrodes, respectively, in 6M KOH electrolyte.