Hydrogen Evolution Reaction on AuNi Surface Alloy Formed on Single Crystal Au Electrodes

The hydrogen evolution reaction (HER) on Au with high chemical stability is activated by alloying it Ni. We evaluated the HER activity of AuNi surface alloy prepared at different temperatures single-crystal electrodes in 0.05 M H2SO4. potential cycle, including region Ni oxidative dissolution, further enhanced dealloying Ni, and depended structure substrate following order: AuNi/Au(100)<AuNi/Au(111)<AuNi/Au(110). atomic composition were investigated using X-ray photoelectron spectroscopy diffraction. Surface structural analysis revealed that dissolution from surface-alloy layer resulted a decrease occupancy topmost layer. creates low-coordination sites alloy, which activates HER.