Smooth and rough platinum deposits resulting from the electroreduction of hydrous oxide platinum overlayers—a mechanistic approach

摘要: The electroreduction of thick platinum oxides accumulated by the application a fast square wave perturbing potential in 0.5 M H2SO4 was studied using potentiodynamic and potentiostatic techniques complemented with scanning electron miscroscopy. process can be unambigously explained through an instantaneous nucleation 3-D growth right circular cones under charge transfer control where diffusion reacting species to growing centres is essential for further expansion. mode Pt crystallites either smooth or rough depends on conditions. rought/smooth modes result from influence electric field transport particles reaction region supersaturation concentration operating during electrocrystallization process.