The experiments
were carried out at roomtemperature, before the experiments the electrolyte
was deoxygenated with Ar (Air Products, 5.0 N), during the experiments
the gas stream was directed above the solution level. A CHI
660D potentiostat (CH Instruments) was used in the experiments. The
real surface area, used for current density calculation, was determined
by integration of voltammetric currents due to desorption of
underpotential deposited (UPD) adsorbed hydrogen [25–27] recorded
with negative potential limit of −800 mV (typically adopted surface
coverage with adsorbed hydrogen of 0.77 [27] although the value of
unity is also considered [26]) and with assumed specific charge density
of 210 μC cm−2 for full coverage with adsorbed hydrogen [26–28