Morphology data of platinum/HOPG electrodes and their electrocatalytic properties

F.J. RODRÍGUEZ NIETO, M.A. PASQUALE, A.J. ARVIA

Edinburgo, Escocia

Congreso; 57th Annual Meeting of the International Society of Electrochemistry; 2006

International Society of Electrochemistry

The electrocatalytic reactivity of metal electrodes, such as Pt and Pt alloys utilized in different electrochemical conversion devices, exhibit a scale-dependent the surface morphology and a relative distribution of crystal faces at metal c1ustersand aggregates that depend on the preparation procedure. This work reports the influence of electrical perturbations on the surface properties of electrachemically prepared platinum/highly oriented pyrolitic graphite electrodes. Data from atomic force and scanning tunneling microscopy imaging offers the possibility to establish a correlation among surface properties of these electrodes, size distribution functions, aspect ratio of aggregates, fractal dimension, energy distribution of surface sites, and their electrocatalytic behaviour for three test electrochemical processes, namely, H-atom electrosorption processes; molecular oxygen electroreduction; methanol electrooxidation.