Identify the components of a fuel cell. zinc-manganese hydrogen-oxygen nickel-metal hydride lithium ion nickel-cadmium

            Components of Fuel cell are Hydrogen and Oxygen gases.

Explanation:
                   Fuel cells are electrochemical devices which converts chemicals i.e. a fuel like H₂ and oxidants like O₂ into direct current (D.C).
                   As we know when hydrogen is reacted with oxygen it produces water along with heat. Same reaction is carried out in fuel cells in a very controlled way.
                   The Hydrogen gas is oxidized at anodes to convert it into H⁺ ions and electrons.

At Anode:
                                     2 H₂        →        4 H⁺  +  4 e⁻

These electrons are passed through external circuit to Cathode. Meanwhile, the H⁺ ions passes through the porous anode to electrolyte to cathode chamber.

The electrons arrived at cathode reduces oxygen gas to O²⁻.

 At Cathode:
                                    O₂  +  4 e⁻      →      2 O²⁻

In cathode chamber O²⁻ reacts with H⁺ to produce water.

                               2 O²⁻  +  4 H⁺      →        2 H₂O

This water produced is utilized by Astronomers in Satellites.