Question

Give electrode reactions of hydrogen-oxygen fuel cell.

Answer 1

At anode: \[\ce{[H2_{(g)} + 2OH^-_{ (aq)} -> 2H2O_{(l)} + 2e-] × 2}\] 

At cathode: \[\ce{O2_{(g)} + 2H2O_{(l)} + 4e- -> 4OH^-_{ (aq)}}\]
                                                                                            
Overall reaction: \[\ce{2H2_{(g)} + O2_{(g)} -> 2H2O_{(l)}}\]