Electrochemical electrodes 10 Electrodes 10 Rotating disk electrodes Rotating disks 10 Catalysts 8 Electrochemical impedance spectroscopy 8 Hydrogen evolution reactions 8 Kinetic and thermodynamic parameters 8 Kinetics 8 Nickel 8 Spectroscopy 8 Catalyst activity 6 Deposition 6 Impedance spectroscopy 6 Spontaneous deposition 6 Cathodes 4 Cyclic voltammetry 4 Electrocatalytic activity 4 Electrochemical characterizations 4 Hydrogen 4 Hydrogen evolution 4 Hydrogen generation 4 Hydrogen generations 4 Hydrogen production 4 Nickel/ruthenium 4 Reaction kinetics 4 Rotating disk electrode 4 Ruthenium 4 Spectrum analysis 4 Ageing 2