Synthesis of Ni/graphene sheets by an electroless Ni-plating method

Ni/graphene sheets were synthesized from graphene oxide sheets using electroless Ni-plating in a NiSO₄ solution, with NaBH₄ as a reducing agent. The samples were characterized by X-ray diffraction, scanning and transmission electron microscopy. Ni deposited on the surface of the reduced graphene oxide sheets had a high dispersion without aggregation, although the amount of Ni was as high as 32.9% by mass., The stacking of Ni/graphene sheets resulted in the formation of meso- and macropores. Nitrogen adsorption showed that the meso- and macropores had a slit shape and that the Brunauer-Emmett-Teller specific surface area reached 91m²/g. The average pore size calculated by the Barret-Joyner-Halenda method from desorption studies was 3.83nm, with a pore volume of 0.28cm³/g.