Fuel cell separator and fuel cell
View Patent ↗A fuel cell separator in which the adhesion of a conductive coating formed on the surface of the fuel cell separator is further improved. The fuel cell separator ( 20 ) includes a metal substrate ( 24 ) molded from titanium, and a conductive coating ( 30 ) that exhibits conductivity and is formed on the surface of the metal substrate ( 24 ), wherein the conductive coating ( 30 ) contains conductive particles, and the average particle size of the conductive particles is not less than 1 nm and not more than 100 nm. The average particle size of the conductive particles is preferably not less than 1 nm and not more than 10 nm, and more preferably not less than 1 nm and not more than 5 nm.
1. A fuel cell separator, comprising:
a metal substrate molded from titanium,
a conductive coating that exhibits conductivity and is formed on a surface of the metal substrate, and
an oxide layer being a continuous layer provided between the metal substrate and the conductive coating,
wherein
the conductive coating comprises gold particles,
an average particle size of the gold particles is not less than 1 nm and not more than 100 nm, and
the thickness of the oxide layer is from 5 nm to 200 nm.
2. The fuel cell separator according to claim 1 , wherein
the average particle size of the gold particles is not less than 1 nm and not more than 10 nm.
3. The fuel cell separator according to claim 2 , wherein
the average particle size of the gold particles is preferably not less than 1 nm and not more than 5 nm.
4. The fuel cell separator according to claim 1 , wherein
the oxide layer is a titanium oxide layer.
5. A fuel cell, comprising a fuel cell separator according to claim 1 .
6. The fuel cell according to claim 5 , wherein
the average particle size of the gold particles is not less than 1 nm and not more than 10 nm.
7. The fuel cell according to claim 6 , wherein
the average particle size of the gold particles is preferably not less than 1 nm and not more than 5 nm.
8. The fuel cell according to claim 5 , wherein
the oxide layer is a titanium oxide layer.
9. The fuel cell separator according to claim 1 , wherein a coating rate of the surface of the metal substrate by the conductive coating is 70% or greater.