Question

Name the cell which was used in the Apollo space programme for providing electrical power.

Hint:

Fuel cells convert chemical energy directly into electrical energy. Apollo missions used H\(_2\)–O\(_2\) fuel cells.

Answer 1

Concept: Space missions require a continuous and reliable source of electrical energy. In the Apollo space programme, electrical energy was produced using electrochemical cells that convert chemical energy directly into electrical energy.
Step 1: Identify the type of cell. The Apollo spacecraft used the
Hydrogen–Oxygen fuel cell.
Step 2: Working principle. In this fuel cell:

• Hydrogen is oxidized at the anode.
• Oxygen is reduced at the cathode.
• The overall reaction produces water and releases electrical energy.

Overall reaction: \[ 2H_2 + O_2 \rightarrow 2H_2O \]
Step 3: Advantage in space missions.

• High efficiency
• Continuous power supply
• Water formed was used by astronauts

\[ \therefore \text{The cell used was Hydrogen–Oxygen fuel cell. \]