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Question 1

describe the reactions that take place in a hydrogen fuel cell with half equations and overall equation.

Answer 1

• hydrogen supplied at anode loses electrons to form ions:
  2H2 -> 4H^+ + 4 e^-
• oxygen is supplied at cathode; hydrogen ions at anode travel through electrolyte to cathode to react with oxygen to form water:
  O2 + 4H^+ + 4e^- -> 2H2O
• overall, hydrogen fuel is oxidised to form water:
  2H2 + O2 -> 2H2O