Question

write the net cell reaction in fuel cell​

Answer 1

Answer:

hydrogen fuel cell is an electrochemical cell that uses a spontaneous redox reaction to produce current that can do work. The net reaction is exothermic.

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Answer 2

Answer:

$H_{2} + 1/2 O_{2}\rightarrow H2O\ (\bigtriangleup G_{f} = -229 kJ/mol)\\H_{2}\rightarrow 2 H^{+} + 2 e^{-}\ (E_{0}= 0.00 V)\\O_{2} + 4 e^{-} + 4 H^{+}\rightarrow 2 H2O\ (E0= 1.23 V)$

Explanation:

$H_{2} + 1/2 O_{2}\rightarrow H2O\ (\bigtriangleup G_{f} = -229 kJ/mol)\\H_{2}\rightarrow 2 H^{+} + 2 e^{-}\ (E_{0}= 0.00 V)\\O_{2} + 4 e^{-} + 4 H^{+}\rightarrow 2 H2O\ (E0= 1.23 V)$

A hydrogen fuel cell is an electrochemical cell that uses a spontaneous redox reaction to produce a current that can do work. The net reaction releases energy( exothermic). When we combine the two half cell potential it gives a positive cell potential.

The overall cell potential is 1.23V.

Efficiency of the fuel cell is:    $\bigtriangleup G/\bigtriangleup H$