What is the open circuit voltage (Eof an ideal methanol fuel cell at RTP? AG-679.3 x...
A direct methanol Fuel cell operates on Methanol at 60 °C CH3OH is fuel for global reaction CH3OH (1) + 3/202- CO2 + 2H20 (1) Ignoring the heat capacity, calculate the heat potential associated with the above reaction. [Use the table below and definition of Gibbs free energy] CH3OH (1) O2 (gas) CO2 H20 (1) -238.5 KJ/mol O KJ/mol -285.83 KJ/mol 127.19 J/mol.K 205.00 J/mol.K 213.79 J/mol. 69.95 J/mol.K. 969.7kJ/mol 769.9kJ/mol 699.7kJ/mol; 996.7 kJ/mol;
Anode: CH2OH + H2O + 6H+ 3 2 Cathode:-02 +6H+ +6e + 340 Overall reaction: CH20H + 302 – 24,0 + CO2 G H kl/mol kJ/mol Methanol(Overall raction) -685.3 -638.5 a) How many MJ of electricity would be produced in an ideal fuel cell at 25°C and 1 atm? (calculate the Energy per kg methanol) b) How would the amount of electricity generated change if air were used instead of pure oxygen? Assume atmospheric pressure and that that the partial...
If the product water is liquid, what is the open circuit voltage of a H2 fuel cell if it operates at 70oC with pH2=2atm, pO2=2atm. Do not consider the overvoltages.
Methanol, CH3OH (l), combusts according to the following equation: 2 CH3OH (l) + 3 O2 (g) → 2 CO2 (g) + 4 H2O (l) ∆rHo (298 K) = −1452 kJ Here is a list of Entropies of formation: S (J K-1 mol-1) at 298 K CH3OH (l) =126.8 O2 (g) = 205.14 CO2 (g) = 213.74 H2O = (l) 69.91 (a) If the above reaction was used in a fuel cell, say, to perform work, what will be the maximum...
Q3. Consider an ideal solar cell with following parameters: Short circuit current - A and open circuit voltage 0.6V. current LOAD (a) Find the diode saturation current (lo) of the solar cell. (10 points) (b) Estimate the power delivered by the solar cell to a load of RL -0.1. Justify any approximation in your calculation (10 points) (e) After few years of field operation, the solar cell developed series resistance of R, ohms and shunt resistance of Rsh ohms. Draw...
(Select one of the following) A fuel cell is at thermodynamics equilibrium: Only at open circuit voltage (OCV) conditions Only at a temperature of absolute zero Under stead-state steady-flow conditions.
(2) (24 pts) A fuel cell produces electricity via a combustion reaction. A DMFC is a proton-exchange fuel cell that uses methanol CH3OH) as the fuel, which reacts with molecular oxygen to produce carbon dioxide and water. (a) (4 pts) Write the balanced combustion reaction for this methanol fuel cell. (b) (4 pts) Write the balanced half-reactions occurring at the cathode and anode of this fuel cell (assume standard acidic conditions) (e) (4 pts) Evaluate AGº (kJ) and AE° (V)...
Calculate the open-circuit voltage for a silicon solar cell at 20oC and 50o C. With saturation current density of Jo = 5.9 x 10-12 amp/cm^2 and light current density JL = 4.45 x 10-2 amp/cm^2 .
Consider a fuel cell that uses the reaction C2H4(g) + 302(g) + 2C02(g) + 2H2O(1) Using the standard free energies of formation, what is the value of Eº for the cell reaction? Substance and State AG (kJ/mol) C2H4 (8) 68.1 CO2(g) -394.4 H2O(1) -237.2 O2(g) 0 Express your answer with the appropriate units. C: HÅR O a ? Eº = 0.0138 Submit Previous Answers Request Answer X Incorrect; Try Again; 4 attempts remaining
Consider a fuel cell that uses the reaction 2C2 H2 (g)502 (g) -» 4CO2(g) 2H20(1) Using the standard free energies of formation, what is the value of E for the cell reaction? Substance and State AG (kJ/mol) C2H2 (g) 209.9 CO2 (g) -394.4 H2O(I) -237.2 O2(g) 0 Express your answer with the appropriate units.