Fuel cell catalyst, fuel cell electrode including the same and membrane-electrode assembly including the same
The present disclosure relates to a fuel cell catalyst, a fuel cell electrode including the same, and a membrane-electrode assembly including the same. In one embodiment, the fuel cell catalyst includes: a support including a titanium oxynitride represented by the following Formula 1: TiO 1-y N y , wherein 0.05<y<0.9; and an active material supported on the support.
1. A fuel cell catalyst comprising:
a support comprising a titanium oxynitride represented by the following Formula 1; and
an active material supported on the support:
TiO1-yNy [Formula 1]
wherein 0.05<y<0.9,
wherein the titanium oxynitride of Formula 1 is comprised in an amount of 2.4 to 20 wt % based on the total weight of the support.
2. The fuel cell catalyst of claim 1 , wherein the titanium oxynitride of Formula 1 is comprised in an amount of 2.5 to 19 wt % based on the total weight of the support.
3. The fuel cell catalyst of claim 1 , comprising 100 parts by weight of the support and 10 to 60 parts by weight of the active material.
4. The fuel cell catalyst of claim 1 , wherein the active material has an average size of 2 to 10 nm.
5. The fuel cell catalyst of claim 1 , wherein the support has a BET specific surface area of 20 to 50 m2/g and an electrical conductivity of 20 to 40 S/cm.
6. The fuel cell catalyst of claim 1 , wherein the support has an average pore size of 50 to 80 nm.
7. The fuel cell catalyst of claim 1 , wherein the support is prepared by a method comprising steps of:
preparing an intermediate by heat-treating titanium dioxide (TiO2) to a temperature of 400 to 900° C. while introducing a nitrogen-containing gas thereto; and
cooling the intermediate.
8. The fuel cell catalyst of claim 7 , wherein the heat- treating is performed by heating to a temperature of 400 to 900° C. at a heating rate of 1 to 15° C/second.
9. The fuel cell catalyst of claim 1 , wherein the active material includes one or more precious metals selected from among platinum (Pt), palladium (Pd), iridium (Ir) and ruthenium (Ru).
10. The fuel cell catalyst of claim 9 , wherein the active material further comprises one or more transition metals selected from among copper (Cu), cobalt (Co), nickel (Ni) and iron (Fe).
11. A fuel cell electrode comprising the fuel cell catalyst of claim 1 .
12. A membrane-electrode assembly comprising: a cathode; an anode; and an electrolyte membrane interposed between the cathode and the anode,
wherein one or more of the cathode and the anode comprise the fuel cell catalyst of claim 1 .
13. A fuel cell comprising the fuel cell catalyst of claim 1 .