Question

what are anode and cathode of H2-O2 fuel cell? Name the electrolyte used in it. Write electrode reaction and net cell reaction taking place in the fuel cell.
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Answer 1

Solution. 1) The anode and cathode are porous carbon rods containing small amount of finely divided platinum metal that acts as a catalyst. 2) The electrolyte used is hot aqueous solution of KOH.

The reaction is:

At anode: 2H

2

(g)+4OH

−

→4H

2

O(l)+4e

−

At cathode: O

2

(g)+2H

2

O(l)+4e

−

→4OH

−

_____________________________________

Net cell reaction: 2H

2

(g)+O

2

(g)→2H

2

O(l)

Answer 2

refer to the attachment