Investigation of hydrogen evolution activity for the nickel, nickel-molybdenum nickel-graphite composite and nickel-reduced graphene oxide composite coatings

- Improved HER efficiency of Ni-Mo coatings was attributed to 'cauliflower' like microstructure.
- RGO in nickel-RGO composite coating promoted refined grain and facilitated HER.
- Synergistic effect between nickel and RGO facilitated HER due to large specific surface of RGO.