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Which of the following statement is true regarding efficiencies of fuel cell?

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Which of the following statement is true regarding efficiencies of fuel cell?

(a) ƞ0 = ƞr

(b) ƞ0 > ƞr

(c) ƞ0 < ƞr

(d) ƞ0 ≤ ƞr

This question was addressed to me in an internship interview.

This intriguing question comes from Inorganic Chemical topic in portion Inorganic Chemical Industries of Chemical Technology

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Correct answer is (c) ƞ0 < ƞr

Best explanation: ƞ0 < ƞr. ƞ0 is the overall efficiency of the fuel cell which includes incorrect ∆H at the electrodes, I^2 R  losses from cell resistances and polarizability. Hence overall efficiency is always less than the reversible or ideal efficiency.

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