KINETICS OF THE HYDROGEN EVOLUTION REACTION ON 18Cr-10Ni STAINLESS STEEL IN SEAWATER. II. INFLUENCE OF TEMPERATURE

The potentiostatic steady state voltammetry and electrochemical impedance spectroscopy experiments were done for the hydrogen evolution reaction in artificial seawater at five temperatures: 295, 303, 313, 323 and 333 K. The effect of temperature on the kinetics parameters – exchange current density, i0 and charge transfer coefficient, α – was evaluated. It found that α decreases and i0 increases with temperature of the solution. The impedance data was analyzed by a non-linear least square (NLS) fitting program and impedance parameters were evaluated. The formal electrochemical and chemical enthalpies of activation and the potential at which the hydrogen evolution reaction occurs as an activationless process are deduced.