Abstract
The influence of platinum crystallite size on the electrocatalytic reduction of oxygen molecules in both hot phosphoric acid and sulphuric acid has been examined. It becomes obvious that when the intercrystallite distance is greater than an average of 20 nm, the apparent specific activity is fully achieved for all electrocatalyst dispersions, and that the crystallite size effect is not truly dependent on the dimensions of the platinum crystallites but is dependent on the intercrystallite distance. The crystallite size effect reported previously is not obtained in the present work by using high surface area carbons as the supports for highly dispersed platinum crystallites. The surface area of the carbon support required in order to obtain the fully active Pt crystallites in various fine sizes is indicated for different platinum loadings.
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