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CHARACTERIZATION OF TUNGSTEN/TITANIUM CARBIDE COATINGS DEPOSITED BY CATHODIC ARC DEPOSITION FOR HYDROGEN EVOLUTION

In this investigation, the use of thin films of tungsten-titanium carbide as electro-catalysts for the evolution reaction of hydrogen (HER) was evaluated. Thin films, with a different number of layers, were deposited on titanium substrates by cathodic arc deposition. The samples were structurally characterized by X-ray diffraction (XRD) and the surface roughness was analyzed by Atomic Force Microscopy (AFM). The HER kinetics were analyzed with 0.5 M sulfuric acid as an electrolyte on films supported on titanium substrates. With EIS together with AFM, the relationship between surface roughness and the electrochemical response was determined, indicating that as the number of layers increases, the capacitive activity increases and the grain size decreases, associating with the generation of hydrogen production. It was concluded that the coatings generate catalytic activity when subjected to 1000 voltammetric cycles.