Write two advantages of hydrogen - oxygen fuel cell.

Question

Consider following reaction :
$Fe(OH)_2 + 2e^- \rightarrow Fe(s) + 2OH^-$ , $E^{\circ} = -0.88 \text{ V}$
$AgBr(s) + e^- \rightarrow Ag(s) + Br^-(aq)$ , $E^{\circ} = 0.07 \text{ V}$
Select the correct statement.
(1) $E^{\circ}_{cell} = -0.95 \text{V}$
(2) $E^{\circ}_{cell}$ is an extensive property
(3) $Fe$ is getting reduced
(4) Net cell reaction: $Fe(s) + 2OH^-(aq) + 2AgBr(s) \rightarrow Fe(OH)_2 + 2Ag(s) + 2Br^-(aq)$

Answer 1

Step 1: Understanding the Concept:
Fuel cells are electrochemical cells that convert the chemical energy of a fuel directly into electrical energy. The $H_2-O_2$ fuel cell is the most common type.
Step 3: Detailed Explanation:
Two major advantages of the $H_2-O_2$ fuel cell are:
1. High Efficiency: Unlike thermal power plants which have an efficiency of 35-40%, fuel cells can achieve an efficiency of about 70% in converting chemical energy to electrical energy.
2. Pollution-Free: The only product formed during the cell reaction is water ($H_2O$). No harmful gases like $CO_2$, $SO_x$, or $NO_x$ are released, making it an eco-friendly source of energy.
3. Continuous Operation: Unlike conventional batteries, a fuel cell provides electricity continuously as long as the fuel and oxidant are supplied.
Step 4: Final Answer:
The main advantages are high thermodynamic efficiency and the production of pure water as a byproduct.

Write two advantages of hydrogen - oxygen fuel cell.

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Solution and Explanation

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