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Electrocatalytic hydrogen evolution reaction based on reduced graphene oxide:Pt nanocomposite

We fabricated the composite of reduced graphene oxide (rGO) nanosheets and platinum nanoparticels (Pt NPs) using a pyrolysis spray coating method to investigate their electrocatalytic hydrogen evolution reaction (HER) performance. The atomic force microscopy was used to characterize surface morphology of rGO:Pt nanohybrids. Pt is mostly decorated on rGO nanosheets in form of NPs with diameter sizes in range of 5–30 nm. The HER performance in 0.25 M H2SO4 of the rGO:Pt nanohybrids showed a yielding Tafel slope of 123 mV/decade which is better than that of Pt (166 mV/decade). Even the rGO itself exhibits a poor HER activity, it work as an excellent supporting base in improving catalytic active site, electrical conductivity, and accepting the spillover hydrogen atoms from Pt NP surface in electrocatalytic HER activities.