Draw a neat labelled diagram of `H_(2)-O_(2)` fuel cell. Write the reaction occurs at cathode of the cell.

Explanation

In this cell, hydrogen and oxygen are bubbled through porous carbon electrode into concentrated aqueous sodium hydroxide.
Hydrogen is fed into the anode compartment where it is oxidised.
The oxygen is fed into cathode compartment where it is reduced.
Anode : `2[H_(2)(g)+2OH^(-)(aq) to 2H_(2)O(l)+2e^(-)]`
Cathode: `O_(2)(g)+2H_(2)O(l)+4e^(-) to 4OH^(-)(aq)`
Overall: `2H_(2)(g)+O_(2)(g) to 2H_(2)O(l)`