Method for generating oxygen, and water electrolysis device

A method for generating oxygen, the method comprising:

• (a) preparing a water electrolysis device comprising:
• an electrolyte film;
• an anode which is in contact with a front surface of the electrolyte film and includes at least one silver delafossite compound selected from the group consisting of a silver cobalt delafossite compound represented by a chemical formula AgCoO2 and a silver rhodium delafossite compound represented by a chemical formula AgRhO2;
• a cathode which is in contact with a back surface of the electrolyte film;
• and
• a power supply,
• wherein
• the at least one silver delafossite compound is in contact with the electrolyte aqueous solution, and
• (b) applying an electric potential difference between the cathode and the anode using the power supply to generate oxygen on the anode due to electrolysis of water which occurs on the at least one silver delafossite compound.

A water electrolysis device comprising:

• a container storing an electrolyte aqueous solution;
• an anode which is in contact with the electrolyte aqueous solution and includes at least one silver delafossite compound selected from the group consisting of a silver cobalt delafossite compound represented by a chemical formula AgCoO2 and a silver rhodium delafossite compound represented by a chemical formula AgRhO2;
• a cathode which is in contact with the electrolyte aqueous solution;
• and
• a power supply for generating oxygen on the anode due to electrolysis of water which occurs on the at least one silver delafossite compound by applying an electric potential difference between the cathode and the anode,
• wherein
• the at least one silver delafossite compound is in contact with the electrolyte aqueous solution.

A water electrolysis device comprising:

• an electrolyte film;
• an anode which is in contact with a front surface of the electrolyte film and includes at least one silver delafossite compound selected from the group consisting of a silver cobalt delafossite compound represented by a chemical formula AgCoO2 and a silver rhodium delafossite compound represented by a chemical formula AgRhO2;
• a cathode which is in contact with a back surface of the electrolyte film;
• and
• a power supply for generating oxygen on the anode due to electrolysis of water which occurs on the at least one silver delafossite compound by applying an electric potential difference between the cathode and the anode,
• wherein
• the at least one silver delafossite compound is in contact with the electrolyte aqueous solution.