Oxygen reduction catalyst, fuel cell, air cell, and method for producing oxygen reduction catalyst
View Patent ↗Provided is a novel oxygen reduction catalyst having good stability and higher oxygen reduction performance. The oxygen reduction catalyst includes a composite oxide comprising a conductive tin oxide containing Zr.
1. An oxygen reduction catalyst for an air cell, wherein the oxygen reduction catalyst comprises a composite oxide comprising a conductive tin oxide containing Zr, wherein the conductive tin oxide comprises zirconium having an oxidation number of +3.0 or more and less than +4.0, and wherein the tin oxide is represented by the composition formula: SnOx1, in which x1 is from 1 to 2, and wherein the composite oxide has a volume resistivity of 10,000 Ωcm or less.
2. The oxygen reduction catalyst according to claim 1 , wherein the composite oxide has a BET specific surface area of from 10 to 200 m 2 /g.
3. The oxygen reduction catalyst according to claim 1 , wherein the composite oxide has a mass percentage ratio Zr/Sn of from 0.001 to 0.095.
4. A fuel cell, comprising the oxygen reduction catalyst according to claim 1 used as an air electrode.
5. An air cell, comprising the oxygen reduction catalyst according to claim 1 used as an air electrode.
6. A method for producing the oxygen reduction catalyst according to claim 1 , wherein the method comprises a step of doping the conductive tin oxide with Zr using an arc plasma vapor deposition method.