A Study on the Separation of Membrane and Leaching of Platinum and Ruthenium by Hydrochloric Acid from MEA of Fuel Cell

In this paper, we carried out separation of membrane and leaching of Pt and Ru using hydrochloric acid from MEA(mem-brane-electrode assembly) of fuel cell. In this method, these were separated from MEA of fuel cell using the distilled water,10 vol.% butanol solution and 15 vol.% cationic surfactant(Koremul-LN-7) by dipping method without the dispersion of catalystparticles. And the leaching of Pt and Ru containing in the separated carbon paper catalysts has been studied by hydrochloric acidusing HNO 3 or H 2 O 2 as a oxidant. The leaching ratio of Pt and Ru were higher when H 2 O 2 was used as a oxidant and the opti-mum conditions were obtained in 8M HCl, the amount of H 2 O 2 5M and 6 hours of leaching time at 90 o C. In this condition,extraction of Pt and Ru were 98% and 71.5%, respectively. Key words : Fuel cell, Membrane-electrode Assembly(MEA), Hydrochloric acid leaching, Platinum, Ruthenium 1. 서론 백금족 금속(Platinum Group Metals, PGMs)들은루테늄, 로듐, 팔라듐, 오스뮴, 이리듐, 백금 등 여섯 원소의 총칭하며 서로 성질이 비슷한 귀금속이며 천연으로 혼합된 원광으로 산출되지만 양이 적다. 또한 우수한 물리·화학적 성질을 지니고 있는데 특히 산화·환원반응의 뛰어난 촉매로 공업적 용도로 널리 개발되고있다. 백금족 금속을 함유하고 있는 광물자원은 매우 희