Abstract

연료전지 폐스택으로부터 백금을 회수하여 재사용하기 위하여 백금의 농도, pH, 환원제, 분산제의 영향을 살펴본 결과 1 mM <TEX>$H_2PtCl_6$</TEX>:10 mM <TEX>$NaBH_4$</TEX>:8 mM Cl4TABr = 1:0.4:0.4(vol.%), pH4, <TEX>$50^{\circ}C$</TEX>, 160 rpm, 10분 조건에서 최적 백금 나노 입자 제조 조건을 확립하였다. 시용 후 폐기된 MEA로부터 산침출을 통해 회수되어진 백금 침출 용액으로부터 백금 모사 용액과 동일한 조건에서 5 nm 이하의 백금 나노 입자를 합성하였다. 백금 모사 용액과 백금 침출 용액으로부터 합성된 백금 나노 입자를 XPS 분석을 통해 백금 이온에서 zero-valent의 백금 나노 입자로 환원되었음을 확인하였다. In this study, for recovery of renewable noble metal from used stack of fuel cell, synthesis of platinum nano particle is established through effect of platinum solution concentration, pH value, reducing agent and dispersing agent at a volume ratio of 1 mM <TEX>$H_2PtCl_6$</TEX>:10 mM <TEX>$NaBH_4$</TEX>:8 mM Cl4TABr = 1:0.4:0.4(vol.%), pH4, <TEX>$50^{\circ}C$</TEX>, 160 rpm and 10min. Less than 5 nm platinum particles were synthesized using Pt leaching solution from used MEA of stack under same condition of method using simulated Pt solution. The characteristics of synthesized nano particles was illustrated by XPS analysis as the reduction of platinum ions into platinum metals(zero-valent).

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