Process for separating electrode for membrane-electrode assembly of fuel cell and apparatus therefor
Disclosed are a process for separating an electrode for membrane-electrode assemblies of fuel cells from the decal transfer film and an apparatus for separating the electrode. In particular, during the electrode separating process, only an electrode is separated from the decal transfer film on which the electrode is coated, without any damage, by a freezing method for freezing the specimen on the deionized water surface, and thus, wasting the expensive MEA is prevented. Thus, mechanical properties of the pristine electrode can be rapidly quantified in advance, and therefore, long term durability evaluation period during developing MEA having excellent durability is substantially reduced.
1. A process for separating an electrode from a decal transfer film for membrane electrode assemblies (MEAS) of fuel cells, comprising:
preparing an electrode specimen by coating an electrode on a decal transfer film;
soaking the electrode specimen by floating the electrode side on a surface of deionized water;
freezing the deionized water in a state that the electrode specimen is soaked on the surface of the deionized water;
removing the decal transfer film from the electrode specimen which is adhered on the frozen deionized water; and
separating only the electrode by thawing the frozen deionized water.
2. The process of claim 1 , wherein the electrode is formed on the decal transfer film by coating a catalyst ink that comprises a platinum catalyst supported on carbon(Pt/C), an ionomer binder, and solvent mixtures on the decal transfer film, and drying thereof.
3. The process of claim 1 , wherein the deionized water has a resistivity of about 10 MΩcm or greater.
4. The process of claim 1 , wherein the decal transfer film is selected from the group consisting of polytetrafluoroethylene (PTFE), poly(ethylene terephthalate) (PET), poly(butylene terephthalate) (PBT), poly(trimethylene terephthalate) (PTT), poly(ethylene naphthalate) (PEN) and polyimide (PI).
5. The process of claim 1 , wherein the electrode specimen is soaked on the surface of the deionized water by facing the electrode of the electrode specimen down toward the deionized water, and facing the decal transfer film up.
6. The process of claim 1 further comprising, before freezing the deionized water, removing bubbles present in the deionized water by boiling the deionized water.