Knowledge of basic principles of water reduction and its conversion into hydrogen by Nature is of a major interest for both fundamental and applied research. A driving force for investigation on the hydrogen evolution from regenerable resources is the environmental problems caused the increasing amount of CO2 production generated by burning of the fossil fuels. The great amount of energy produced by a unit of mass gives an advantage for hydrogen industry compared to other biofuels. The Hydrogenases is the key unit in biological pathway for hydrogen generation [1,2]. In order to expand the nature of metal in complexes modelling the active centers of Hydrogenases, a Cu complex with ligand containing nitrogen and sulfur donor atoms was synthesized (fig.1). The compound shows electrocatalytic proton reduction in the cyclic voltammetry experiment (Fig.2). The analogical investigation was realised in the presence of trifluoroacid (TFA)(Fig.3). Linear dependence of ic/ip – f([TFA)] permits to determine the value of turnover frequency (TOF ≥ 1800 s-1) (Fig.4).