Question

The efficiency of fuel cell is given by the expression \(\eta\) is:

• A. \(\eta=\dfrac{nFE_{\text{cell}}}{\Delta H}\times100\)
• B. \(\eta=\dfrac{nFE_{\text{cell}}}{\Delta S}\times100\)
• C. \(\eta=\dfrac{nFE_{\text{cell}}}{\Delta A}\times100\)
• D. None of the above

Hint:

Fuel cell efficiency compares electrical work to enthalpy change.

Answer 1

The Correct Option is A

Step 1: Useful electrical energy obtained from fuel cell: \[ W = nFE_{\text{cell}} \]
Step 2: Total energy released: \[ \Delta H \]
Step 3: Efficiency: \[ \eta=\frac{nFE_{\text{cell}}}{\Delta H}\times100 \]