Low Cost Oxygen Electrodes.
Abstract
The purpose of this contract was the development of a low cost air electrode for medium temperature (130C) immobilized phosphoric acid (matrix) fuel cell. Thin carbon electrodes catalized with 1 to 2 mg Platinum per sq. cm performed on the average between 0.55 and 0.60 volt (terminal voltage) at 100 mA/sq. cm. X-ray fluorescence was used to determine the distribution and the amount of catalyst actually deposited. Broadening of the X-ray diffraction lines due to scattered radiation indicated a Pt-crystallite size ranging from 70 to 120 A. Long-term testing of these electrodes has shown that the chemical and mechanical stability of the catalyst and structural material are good, i.e., operation for over 1000 hours above 0.6 volt was achieved. The degradation rate beyond 500 hours was extremely low (10 mV per 1000 hours). Carbon anodes with one mg Pt/sq. cm showed a remarkable resistance to Co-poisoning. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1973
- Accession Number
- AD0769905
Entities
People
- K. V. Kordesch
- R. F. Scarr