The following measurements were obtained from a polymer electrolyte membrane fue
ID: 1858892 • Letter: T
Question
The following measurements were obtained from a polymer electrolyte membrane fuel cell operating with hydrogen at the anode and air at the cathode.
V mA/cm^2
0.98 0
0.85 65
0.82 100
0.78 330
0.72 530
0.68 760
0.58 1060
According to the the reactions under the heading on http://en.wikipedia.org/wiki/Proton_exchange_membrane_fuel_cell and
Using the Energies of formation for water:
H2O (L) DELTA(H) = - 285 830 J/gmol DELTA(G) = -237 129 J/gmol
H2O (G) DELTA(H) = - 241 818 J/gmol DELTA(G) = -228 572 J/gmol
Assume all water formed at the cathode leaves in the liquid phase.
Plot the polarization curve, showing a) the standard electrochemical potential for the fuel cell and b) the equicalent of the enthalpy change of reaction expressed as potential
If the fuel cell is operating at 0.75 Volts
c) the value of the current density in units of mA/cm^2
d)what would be the amount of electrical energy produced in units of [J/gmol]?
e)In total, how much heat would be produced by the fuel cell in units of [J/gmol]?
f) What is the overal energy efficiency of the fuel cell in units of %?
g) What is the electrical efficiency of the fuel cell in units of %?
Explanation / Answer
I DUNNO I JUST NEED POINTS
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