6. In a PEM fuel cell with an active area of 300cm2 and a net output voltage of 0.9V, where hydrogen and air are used as reactants, the operating temperature is 70C and the anode and cathode pressures are 2atm. The concentration and ohmic over voltages (voltage losses) are found as 0.03V and 0.004V, respectively, accordingly determine a) The ideal standard voltage and reversible voltage (10 P) b) The irreversible voltage and activation overvoltage (10 P) c) The current density and exchange current density (10 P) d) The power output and maximum fuel cell efficiency (10 P) e) The energy efficiency of the fuel cell (10 P). Some Important Notes: - The Faraday constant, F is 96485C/mol and the gas constant, R is 8.314J/mol.K. - The exchange current density can be determined by: j0=1,081017exp(0,086Tfc) - The correlation between the current density and exchange current density can be given as: n=Rfcj0neFact - You may use the following Table for calculating some electrochemical parameters. Table 1. Enthalpy, Entropy, and Gibbs Free Energy for reactants and products at