Class 12 Chemistry Electrochemistry Fuel cells

Fuel cells

  • In this kind of cell the chemical energyof fossil fuels like coal,gas or oil is initially used to convertwater into high pressure steam and is used to run a turbine to generate

Fig. Diagrammatic representation of fuel cell

  • Hydrogen and oxygenare bubbled using porous carbon electrodes into concentrated aqueoussodium hydroxide solution.
  • Finely splitted platinum orpalladium metal are added to the electrodes for increasing the rateof electrode reactions.

Cathode: O2 (g) + 2H2O (l) + 4e --> 4OH(aq)
Anode: 2H2 (g) + 4OH(aq) ⎯ --> 4H2O(l) + 4e

  • The net reaction is:
    2H2(g) + O2(g) →2 H2O(l)

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