Heat Generation owing to Electrochemical Reaction

The reversible heat generation owing to electrochemical reaction is due to the difference in the energy available in the form of enthalpy of formation and the energy available for electrical work that is, the change in Gibbs free energy and can be estimated as follows  

Using the thermodynamic relation equation, we can also express this reversible heat generation in terms of entropy change as 

Noting that the fuel consumption rate can be expressed in terms of operating current as h = —Equation 4.87 can be written as 

It can be mentioned here that reversible heat generation can be computed for each of the half electrochemical electrode reactions separately and defined as follows  

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Boundary conditions at the electrode-electrolyte membrane interfaces are derived on the basis of the energy balance of the sum of heat losses through anode and cathode sides with tire surface heat generation owing to electrochemical reactions and activation losses as follows ... 

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