I have used GO and ZnO as nanocomposites and its application as supercapacitors. I have to explain that GO-ZnO( flower shape ) composite is better than rGO.
Flower-shaped nanoparticles have a large specific surface area compared to wire or spherical nanoparticles. Due to the large specific surface area of ZnO nanoparticles, the supercapacitors made from the rGo + ZnO composition has a high specific capacitance at a low scan rate.