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Composite Ni-MoO2 coatings were prepared and characterized with respect to  their possible application as electrocatalysts for the hydrogen evolution  reaction (HER) in alkaline solution. The composites were electrodeposited  onto Ni meshes from an ammonium chloride Ni solution with suspended MoO2  particles in simulated industrial conditions for production of commercial  cathodes. The influence of the concentration of MoO2 particles in the  solution and deposition current density on the morphology, chemical and phase  composition of obtained coatings was investigated by scanning electron  microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray  diffraction (XRD). Catalytic activity for the HER of the coatings was  examined by polarization measurements in a 32 wt. % NaOH solution at 90°C and  compared to the activity of the commercial De Nora’s cathode (DN). It was  shown that the most active Ni-MoO2 coating exhibits better polarization  characteristics for the HER than the DN cathode. The mechanism of the HER on  the specified Ni-MoO2 coating was investigated in 8 mol dm-3 NaOH at 30°C by  means of steady-state polarization measurements and an electrochemical  impedance spectroscopy (EIS) method. Based on the theoretical interpretation  of the experimental data, rate constants of the three individual steps of the  HER were determined and the source of catalytic activity of the coating was  elucidated. [Projekat Ministarstva nauke Republike Srbije, br. 172054

Electrodeposition and characterization of Ni-MoO2 composite coatings as cathodes for the hydrogen evolution reaction in alkaline solution