good electrochemical method to obtain information on EAS,
but attention must be dedicated to establish a well-defined
procedure. In particular the GDE preparative method appear
to be fundamental and some critical points can be defined:
(a) the catalyst ink must be prepared preferentially without a
binding agents (PTFE, NafionTM, etc.) that can decrease or
change the catalyst utilization; (b) an exact control of
platinum loading it is necessary before and after the electrochemical
measurements; (c) a constant volume of
NafionTM solution must be utilized to cover electrode surface;
(d) the simplest and reproducible measurement configuration
seem to be a half-cell three-electrodes set-up (with
a working electrode geometric area of 1 cm2). Our experiments
have shown that the presence of an inert gas flowing
on the back of the electrode (as in a full cell configuration)
affects the hydrogen adsorption/desorption processes thus
influencing the CV experiment.