Question

In H₂ - O₂ fuel cell the reaction occuring at cathode is :

(A) 2 H₂O + O₂ + 4 e^-  → 4OH^-

(B) 2 H₂ + O₂ → 2 H₂O (l)

(C) H⁺ + OH^- → H₂O

(D) H⁺ + e^-  → 1/2 H₂ .

Answer 1

Correct Answer is: (A) 2 H₂O + O₂ + 4 e^-  → 4OH^-

H2–O2 fuel cell

At anode : 2OH^– + H₂ → 2H₂O + 2e^–

At cathode : 2 H₂O + O₂ + 4e^– → 4OH^–