a fuel cell converts the chemical energy in fuel and oxidant to electrical energ

Question

a fuel cell converts the chemical energy in fuel and oxidant to electrical energy. The reversible potential for the hydrogen electrode is 0 volt versus the reversible hydrogen electrode (RHE). The reversible potential for the oxygen electrode is 1.2 volts vs. RHE 5. A fuel cell converts the chemical energy in fuel and oxidant to electrical energy (as shown in the figure to the right). The reversible potential for the hydrogen electrode, Et, is 0 volt versus the reversible hydrogen electrode (RHE). The reversible potential for the oxygen electrode, Eo, is 1.2 volt vs. RHE. (10 pts) H2 Fuel Cell H2O A fuel cell is operating with a current density, j of 0.3A/cm', and a cell voltage, Vol of 0.6 volt, in percent) produced by the fuel cell? (10 pts) idant. What is the electricale a) 100% b) 75% c) 65% d) 50% e) none of the above

Explanation / Answer

Here average cell voltage = 0.6 V

Reversible cell voltage = 0 V +1.2 V = 1.2 v

Hence efficiency = (average cell voltage) / (reversible cell voltage) = 0.6/1.2 = 0.5x100 = 50 %

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