Hydrogen evolution at platinum (Pt) and at platinized platinum (Ptz) cathodes

In this study, the cathodic behaviours of bright platinum (Pt) and at plati nized platinum (Ptz) on the platinum anode were investigated in a 1M Na2SO4 electrolyte (pH, from 2 to 8) by means of electrolysis. The theoretical (D elta Erev) and experimental (Delta E-exp) discharge potentials and the cath odic overpotentials (rlc) of the systems were determined. The amounts of hy drogen gas produced at different times on the cathodes at a constant potent ial (5V) were measured and the hydrogen yield was calculated. The resulting scheme has been very helpful to obtain wodified electrocatalytic coating a nd electrode structures at Ptz cathode, able to operate for long time with good and stable performances.