HYDROCARBON FUEL CELL ELECTRODES.
Progress rept. no. 5, 16 Jan-15 Jul 67,
AMERICAN CYANAMID CO STAMFORD CT STAMFORD RESEARCH LABS
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This report describes the continuing evaluation of electrodes and matrix materials in fuel cell systems utilizing acid electrolytes and operating with impure hydrogen fuels. Polarization data showing the effect to CO poisoning and of dilution with CO2 or nitrogen in matrix-type phosphoric acid cells operating at 100 and 150 C are presented. Life tests of up to 5,600 hours duration are reported pure H2 fuel. Tests at 100 C have shown good voltage stability with time, whereas at 150 C, voltage degradation apparently related to growth in platinum crystallite size at the cathode was observed. Anode stability on 10 CO at 150 C appears good, although performance on life test was somewhat lower than predicted from polarization data. Testing with sulfuric acid electrolyte at 70-85 C was carried out in free electrolyte cells, using PTFE-backed electrodes. Anodes containing 5-15 mg noble metalsq cm showed good stability on 1 CO for several hundred hours. Cathodes 10 mg Ptsq cm showed good stability on O2 after an initial drop of 40-60 mv during the first 100 hours or so on test. Total cell performance on pure H2 and O2 was in the range 0.71-0.77 volt at 100 masq cm. Author
- Electric Power Production and Distribution