Method for preparing metal catalyst and electrode
A method for preparing a metal catalyst includes a proton conductive material coating layer formed on the surface of a conductive material. Also, an electrode may be prepared using the metal catalyst. The method for preparing the metal catalyst comprises mixing the conductive catalyst material, the proton conductive material, and a first solvent, casting the mixture onto a supporting layer and drying the mixture to form a conductive catalyst containing film. The method further comprises separating the conductive catalyst containing film from the supporting layer and pulverizing the conductive catalyst containing film to obtain the metal catalyst. The method for preparing the electrode comprises mixing the metal catalyst with a hydrophobic binder and a second solvent, coating the mixture on an electrode support, and drying it.
1. A method for preparing an electrode, comprising:
mixing a metal catalyst comprising a conductive catalyst material and a proton conductive material coating layer formed on the surface of the conductive catalyst material with a hydrophobic binder and a solvent, to obtain a catalyst layer forming composition; and
coating the catalyst layer forming composition on an electrode support and drying the catalyst layer forming composition.
2. The method of claim 1 , further comprising treating the electrode with an acid.
3. The method of claim 2 , wherein the acid is phosphoric acid and the concentration of the acid is about 200 mol % to about 750 mol % based on 100 moles of the proton conductive material.
4. The method of claim 1 , wherein the hydrophobic binder is polytetrafluoroethylene (PTFE) and fluorinated ethylene propylene (FEP).
5. The method of claim 4 , wherein the concentration of the hydrophobic binder is about 1 wt % to about 40 wt % based on the total weight of the metal catalyst.
6. The method of claim 1 , wherein the drying is carried out at about 60° C. to about 150° C.
7. A fuel cell comprising the electrode prepared according to the method of claim 1 .