화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Applied Chemistry for Engineering, Vol.30, No.4, 493-498, August, 2019
DOI10.14478/ace.2019.1046  Export Citation
콜로이드 용액 내의 수소연료전지 공기극 촉매용 백금 입자 성장 속도 관찰
Growing Behaviors in Colloidal Solution of Pt Crystal for PEMFC Cathode
함가현1, 정선기1, 최미화2, 양석란2, 이재영1, 3, †
  • 1광주과학기술원 지구⋅환경공학부
  • 2한국전력공사연구원 창의미래연구소
  • 3GIST 123 Cheomdan-gwagiro, Buk-gu 61005, Korea
Kahyun Ham1, Sunki Chung1, Mihwa Choi2, Seugran Yang2, and Jaeyoung Lee1, 3, †
  • 1School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), 123 Cheomdan-gwagiro, Buk-gu 61005, Korea
  • 2Creative Future Laboratory, Korea Electric Power Corporation (KEPCO) Research Institute, Daejeon 34056, Korea
  • 3광주과학기술원, Ertl 탄소비움연구센터, Ertl Center for Electrochemistry and Catalysis, Korea
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초록
수소연료전지의 백금 촉매층은 높은 활성을 가지고 있어야 하며, 물과 산소의 원활한 물질전달을 위하여 얇은 두께를 유지해야 한다. 이를 위해 수열 합성 기반의 높은 백금 함량의 담지 촉매 합성법이 보고되어 왔지만, 반응과정에서의 입자 성장 거동 및 속도에 대한 접근은 상대적으로 희박하다. 본 연구에서는 환원과정이 완료된 현탁액을 교반하면서 백금 결정의 성장을 시간별로 관찰하였고 이의 전기화학적 활성을 평가하였다. 초반 교반과정 단계의 단지 수 시간에서 백금 콜로이드가 탄소 담지 백금 촉매에 붙어 백금 결정을 성장시키는 것을 확인하였다. 그 이후에는 새로운 핵성장 반응으로 크기가 작은 콜로이드가 형성되지만, 백금 결정 성장에는 참여하지 않는 것을 확인하였다. 따라서 6 h만 교반과정을 겪은 탄소 담지 백금 촉매도 산소환원반응에 대해 우수한 성능을 가지고 있음을 확인하였다.
In polymer exchange membrane fuel cells, it is crucial to fabricate a highly active and thin Pt catalyst layer for the smooth mass transport of dissolved oxygen and water. Although a highly loaded platinum (Pt) catalyst based on the hydrothermal synthesis has been reported in several studies, its growing behaviors and kinetics were yet to be understood. In this study, we investigated the growth of Pt crystal in suspension after the reduction step depending on a stirring time and evaluated the electrochemical activity. For only a couple of hours in the early stage, Pt colloids were adsorbed on the Pt-carbon catalyst and the Pt crystal was grown. After that, the small Pt colloid was formed by another nucleation step, which did not involve the growth of Pt crystal. We reveal that the Pt-Carbon catalyst with stirring for 6 h showed a high activity toward the oxygen reduction reaction.
Keywords:Platinum crystal;Polymer exchange membrane fuel cells;Oxygen reduction reaction;Mass production;Colloidal solution
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