H2O2 production on a carbon cathode loaded with a nickel carbonate catalyst and on an oxide photoanode without an external bias

Efficient H2O2 production both on a nickel carbonate cathode and a photoanode using only H2O, O2, and solar light, was achieved without using an external bias or a membrane.

Tiny Basic Nickel Carbonate Arrays/Reduced Graphene Oxide Composite for High-Efficiency Supercapacitor Application

3D structure composite made of tiny basic nickel carbonate arrays on the surface of reduced graphene oxide nanosheets (G-NiCH) are prepared by the hydrothermal method. The specific surface area of the G-NiCH composites is twice that of single basic nickel carbonate, which is due to the tiny basic nickel carbonate arrays structure wherein each individual nanoneedle is about 20[Formula: see text]nm in length and 2[Formula: see text]nm in width. The G-NiCH electrodes display high-efficiency electrochemical performance with good specific capacitance (1230[Formula: see text]F[Formula: see text]g[Formula: see text]) and excellent stability (100% capacitance retention after 2000 cycles). This is attributed to the synergistic effect that reduced graphene oxide offer fast electron transmission path and basic nickel carbonate act as high effective active material.