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RESEARCH ON LOW TEMPERATURE FUEL CELL SYSTEMS
GENERAL ELECTRIC CO WEST LYNN MASS
Pagination or Media Count:
The polarization behavior of the oxygen electrode or hydrogen-oxygen cells on open circuit and in the non-linear region is shown to depend, among other factors, on a type of electrode material b surface treatment c pH d presence of foreign ions and their concentrations e stirring or agitation f cell design parameters and the technique of single electrode potential measurement. Most significant experimental observations concerning the open circuit behavior include a transient open circuit voltages greater than the thermodynamically reversible potential of 1.23 volts under certain conditions, b experimentally observed effect of higher temperature on the open circuit voltage of the oxygen electrode is in a direction opposite to thermodynamic predictions. Experimental evidence is presented to show that the hydrogen and oxygen electrodes operating in the same bulk electrolyte under steady-state current flow conditions are always associated with significant pH changes or concentration gradient at each electrode. Author
APPROVED FOR PUBLIC RELEASE