Question

One of the fuel cells uses the reaction of hydrogen and oxygen to form water. Write down the cell reaction taking place in the anode and cathode of that fuel cell.

Answer 1

For $H_2-O_2$ fuel cell
Oxidation at anode:
$2H_2\left(g\right)+4O{H}^{-}\left(aq\right)\to 4H_{2}O\left(l\right)+4e^{-}$
Reduction at cathode:
$O_2\left(g\right)+2H_{2}O\left(l\right)+4e^{-}\to 4O{H}^{-}\left(aq\right)$
Net cell reaction:
$2H_2\left(g\right)+O_2\left(g\right)\to 2H_{2}O\left(l\right)$