Efficiency of Fuel Cell versus Heat Engine

9 EFFICIENCY OF FUEL CELL VERSUS HEAT ENGINE 

The maximum (thermodynamic) efficiency of a heat engine, 4,i, he is defined by well-known Carnot s theorem  

The maximum (thermodynamic) efficiency of a fuel cell, 4,i, pc defined by the ratio of the useful Gibbs energy of the total cell reaction, G, to the whole energy of chemicals (fuel and oxidizer), A, which is enthalpy  

The entropy of the fuel cell reaction, A,5, multiplied by cell temperature in K provides the amount of heat to be released or consumed when the fuel cell is in equilibrium state  

If the relationship between the internal resistance and the area-specific resistance Tpc is (/ i /pc) = ( Fci) and the overpotential can be defined as ppc = -Ain[(/ -i- j lj + 51n(l-y//iijjj), then Equation 8.1 can be presented in the general form as follows  

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Theoretical (thermodynamic) efficiency of fuel cell versus heat engine is considered. The efficiency of fuel cell under load is also introduced. 

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