Calculate the efficiency of a fuel cell given the heat of combustion of hydrogen is -286.0 kJ Mol-1 , and the Gibbs free energy change for the fuel cell is -238 kJ mol-1
A fuel cell is:
I.A voltaic cell in which continuous supply of fuels are sent at anode to perform oxidation.
II. A voltaic cell in which fuels such as :
CH4,H2 and CO are used up at anode.
III. One which involves the reaction of H2O2 fuel cell such as:
Anode : 2H2+4⊖OH→4H2O(l)+4e−
Cathode : O2+2H2O(l)+4e−→4⊖OH
IV. The efficiency of H2−O2 fuel cell is 70 to 75%.
The thermodynamic efficiency of a cell is given by:
The efficiency of a cell is 60%. Its cell reaction is A(s)+B2+(aq.)→A2+(aq.)+B;ΔH=−240 kJ. The standard electrode potential of cell is?