Catalyst, liquid composition, electrode, catalyst electrode for electrochemical reaction, fuel cell, and air battery
The present invention provides a catalyst which has oxygen reduction catalytic ability surpassing that of a platinum-carrying carbon material. This catalyst comprises a carbon material and a metal complex represented by formula (1). In formula (1), X 1 to X 8 each independently represent a hydrogen atom or a halogen atom, D 1 to D 4 each represent a nitrogen atom or a carbon atom wherein the carbon atom has bound thereto a hydrogen atom or a halogen atom, and M represents a metallic atom.
1. A catalyst comprising:
a metal complex represented by formula (1); and
a carbon material, wherein the carbon material is carbon nanotube, carbon black, or graphene, and wherein the carbon material contains a carboxyl group, and a content of the carboxyl group is 20% by mass or less with respect to 100% by mass of the carbon material,
in formula (1), X 1 to X 8 each independently represent a hydrogen atom or a halogen atom, D 1 to D 4 each represent a nitrogen atom or a carbon atom wherein the carbon atom has bound thereto a hydrogen atom or a halogen atom, and M represents an iron atom.
2. The catalyst according to claim 1 ,
wherein a proportion of the metal complex is 75% by mass or less with respect to a total of 100% by mass of the metal complex and the carbon material.
3. The catalyst according to claim 1 ,
wherein the metal complex is a compound represented by formula (2),
in formula (2), X 1 to X 8 each independently represent a hydrogen atom or a halogen atom, and M represents an iron atom.
4. A liquid composition, comprising:
the catalyst according to claim 1 ; and
a liquid medium.
5. An electrode comprising:
the catalyst according to claim 1 .
6. A fuel cell, comprising:
the electrode according to claim 5 .
7. An air battery, comprising:
the electrode according to claim 5 .
8. A catalyst electrode for electrochemical reaction, comprising:
the catalyst according to claim 1 .