Perovskites for reduction-re-oxidation thermochemical water and carbon dioxide splitting

A method of producing hydrogen and oxygen, the method comprising:

• a) heating a metal-oxide perovskite material;
• b) reducing the metal-oxide perovskite material to yield oxygen and a reduced metal-oxide perovskite material having a general formula Ca1-xCexTiyMn1-yO3-δr, wherein x is in a range of about 0.3 to about 0.35, y is in a range of about 0.25 to about 0.35, and 0.5>δr>0;
• c) cooling the reduced metal-oxide perovskite material;
• and
• d) contacting the reduced metal-oxide perovskite material with a re-oxidizing fluid comprising steam to yield hydrogen and a re-oxidized metal-oxide perovskite material having a general formula Ca1-xCexTiyMn1-yO3-δo, wherein 0<δo<δr.

A method of producing carbon monoxide and oxygen, the method comprising:

• a) heating a metal-oxide perovskite material;
• b) reducing the metal-oxide perovskite material to yield oxygen and a reduced metal-oxide perovskite material having a general formula Ca1-xCexTiyMn1-yO3-δr, wherein x is in a range of about 0.3 to about 0.35, y is in a range of about 0.25 to about 0.35, and wherein 0.5>δr>0;
• c) cooling the reduced metal-oxide perovskite material;
• and
• d) contacting the reduced metal-oxide perovskite material with a re-oxidizing fluid comprising carbon dioxide to yield carbon monoxide and a re-oxidized metal-oxide perovskite material having a general formula Ca1-xCexTiyMn1-yO3-δo, wherein 0<δo<δr.