RADIOISOTOPE STUDY OF THE ELECTROSORPTION OF METHANOL ON FUEL CELL ELECTRODES.
Research and development rept.,
NAVY MARINE ENGINEERING LAB ANNAPOLIS MD
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Radiotracer techniques were used in the study of steady-state methanol adsorption as a function of potential on platinum electrodes in normal sulfuric acid solutions at room temperatures. A new window-electrode based on the use of gold-coated polyester film was developed in order to achieve high mechanical strength and counting efficiency. The observed steady-state coverage and the approach to the steady state were profoundly affected by the electrochemical pretreatment of the electrodes just prior to measurement. A bell-shaped curve of coverage versus potential was observed with preoxidized electrodes. The potential at which maximum adsorption occurred was 0.2 volt and was independent of methanol concentration, which deviates from results reported by previous investigators. With prereduced electrodes, the bell-shaped curve of coverage versus potential was distorted at low potentials. The time required for establishing steady-state coverage depended on the potential, being as long as 40 minutes in some cases. Author
- Electric Power Production and Distribution