question archive You and a colleague are discussing your options for improving the current density of your H2-O2 fuel cell
You and a colleague are discussing your options for improving the current density of your H2-O2 fuel cell
Subject:ChemistryPrice: Bought3
You and a colleague are discussing your options for improving the current density of your H2-O2 fuel cell. You are first focused on the kinetics at the cathode. For the base case consider the ORR at the PtCr-C electrode surface, in contact with a Nafion electrolyte. Assume the cell is operating at standard state, has an activation overpotential of 35 mV and the transfer coefficient has a value of 0.4. Calculate the current density when:
a. The electrode surface is smooth. (2 marks)
b. The real electrode area is 104 times the area of a smooth electrode. (2 marks)
c. The PtCr-C electrode is replaced with one made of Pt-C (still 104 times the area of a smooth
electrode). (2 marks)
d. The temperature is increased to 363 K. Assume the PtCr-C electrode, with area 104 times the area of a smooth electrode. Further assume that concentrations are unaffected by the
temperature change. (2 marks)
