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The standard cell potential (E°cell) of a fuel cell based on the oxidation of methanol in air that has been used to power television relay station is measured as 1.21 V. The standard half cell reduction potential for {E°O2/H2O} is 1.229 V. Choose the correct statement: (1) The standard half cell reduction potential for the reduction of CO2 (E°CO2/CH3OH) is 19 mV (2) Reduction of methanol takes place at the cathode (3) Reactants are fed at one go to each electrode (4) Oxygen is formed at the anode

1. (1)
2. (2)
3. (3)
4. (4)

Correct answer: (1)

Solution

The standard half cell reduction potential for the reduction of CO2 to methanol (E°CO2/CH3OH) is indeed 19 mV, which indicates the relative ease of this reaction compared to others in the cell, making option (1) correct.

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