Consider a PEFC operating with the following specifications: = 80% and the pressure is 2 atm at the anode, and = 20% and the pressure is 3 atm at the cathode. Assume that the gibbs free energy of formation at standard pressure for at 90o C is -233,265 joules.
a) Calculate the Nernst voltage of the PEFC if the operating temperature is 90o C.
b) Find the change in Nernst voltage if the cathode pressure is reduced to 1.5 atm, all else the same.