PtAu Nanoparticles Supported by Reduced Graphene Oxide as a Highly Active Catalyst for Hydrogen Evolution

PtAu nanoparticles spontaneously deposited on graphene support, PtAu/rGO, have shown remarkably high catalytic activity for hydrogen evolution reaction (HER) in sulfuric acid solution. SEM images of the PtAu/rGO electrode surface showed that Pt are non-uniform size occupy both edges previously uniform Au and support. XPS analysis atomic percentages were 0.6% 0.3%, respectively. The percentage alone prepared Au/rGO was 0.7%. Outstanding HER achieved electrode, showing initial potential close to equilibrium a low Tafel slope ?38 mV/dec. This confirmed by electrochemical impedance spectroscopy. chronoamperometric measurement performed 40 min at constant indicated good stability durability electrode.