Molecular Engineering of Pt-Based Electrocatalysts for Hydrocarbon Fuel Cell Electrodes.
Semiannual interim rept. no. 6, 1 May-31 Oct 69,
TYCO LABS INC WALTHAM MA
Pagination or Media Count:
The report describes the continued studies of the factors controlling the activity of Pt-black catalysts for the anodic oxidation of hydrocarbons. The report describes a direct comparison of intrinsic activities determined with adsorbed intermediates of propane at 90C with those determined using reduced CO2 at both 90 and 150C. All three methods are exacty equivalent. It was necessary, however, to take special precautions with catalysts that showed significant IR drop in the electrode structure itself in order to establish the equivalence of the methods. A preliminary comparison of intrinsic activities with previously measured physical characteristics of the catalysts indicates that, in contrast to the overall activity which increases with decreasing crystallite size, intrinsic activity shows a tendency to decrease with decreasing crystallite size. Attempts to prepare catalysts with a sharp crystallite size distribution by precipitation in a high viscosity reaction medium were unsuccessful. However, a supported catalyst prepared by impregnating graphite with a viscous solution of chloroplatinic acid provided very much better distribution of the catalyst on the support than had previously been observed. Author
- Physical Chemistry
- Electric Power Production and Distribution