Membrane electrode assembly for hydrogen production, electrochemical cell comprising the same, and method for hydrogen production using the same

A method for hydrogen production, comprising the steps of:

• delivering ammonia to an anode of the electrochemical cell for hydrogen production;
• oxidizing the ammonia at the anode to decompose it into water, nitrogen, and electrons;
• transferring the electrons from the anode to a cathode;
• and
• producing substantially pure hydrogen by the electrons at the cathode, and
• further comprising the step of performing pulse operation by applying a constant voltage to the anode by a current-voltage control device,
• after performing the pulse operation, further comprising the step of circulating and injecting a poisoning removal solution that prevents poisoning of the anode catalyst into the anode by a cycling injection device,
• wherein the pulse operation is repeatedly performed when an average potential of the electrochemical cell for hydrogen production is in the range of 0.5V to 0.9V and −1.0V to 0V,
• wherein the electrochemical cell comprises a membrane electrode assembly comprises:
• an anion exchange membrane;
• a cathode located on one side of the anion exchange membrane;
• and
• an anode located on the other side of the anion exchange membrane,
• wherein the anode includes an alkaline electrolyte containing an aqueous ammonia solution and an anode catalyst, and
• further comprising a current-voltage control device that performs pulse operation by applying a constant voltage to the anode.