화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Clean Technology, Vol.18, No.4, 432-439, December, 2012
Export Citation
일산화탄소 산화를 위한 PtRu/C 시리즈 촉매의 합성 및 특성 연구
Synthesis and Characterization of a Series of PtRu/C Catalysts for the Electrooxidation of CO
이선화, 최승목1, 김원배1, †
  • 광주과학기술원 광공학응용물리학과, 500-712 광주광역시 북구 오룡동 1
  • 1광주과학기술원 신소재공학부, 500-712 광주광역시 북구 오룡동 1
Seonhwa Lee, Sung Mook Choi1, and Won Bae Kim1, †
  • Department of Photonics and Applied Physics, Gwangju Institute of Science and Technology, 1 Oryong-dong, Buk-gu, Gwangju 500-712, Korea
  • 1School of Materials Science and Engineering, Gwangju Institute of Science and Technology, 1 Oryong-dong, Buk-gu, Gwangju 500-712, Korea
E-mail:
초록
백금(Pt)과 루테늄(Ru)의 조성비가 일산화탄소(CO) 산화반응에 미치는 영향을 조사하고자 탄소를 지지체(support)로 사용한 20 wt% 백금과 백금-루테늄 시리즈 촉매(Pt : Ru = 7 : 3, 5 : 5, 3 : 7)를 콜로이드 방법(colloidal method)으로 합성하였다. 다양한 물리ㆍ화학적 분석장비인 투과전자현미경(transmission electron microscopy, TEM)과 X-선 회절(X-ray diffraction, XRD), 에너지 분산형 X-선 분석기(energy dispersive X-ray spectroscopy, EDS)를 이용하여 구조.화학적 특성을 분석하고, X-선 광전자 분광법(X-ray photoelectron spectroscopy, XPS)을 통해 전자적 특성 변화를 확인하였다. 더불어 일산화탄소 벗김 전압전류실험(CO stripping voltammetry)을 이용하여 전기화학적 거동을 분석하였다. 합성된 촉매들 중 Pt5Ru5/C가 가장 낮은 개시 전위(vs. Ag/AgCl)와 가장 큰 일산화탄소의 전기화학적 활성화 표면적(CO EAS) 값을 나타냈으며 이를 통해 Pt5Ru5/C이 일산화탄소의 전기화학적 산화반응에 있어 가장 효과적인 촉매임을 확인하였다. Pt5Ru5/C의 격자상수 변화를 통한 구조적 특성변화 및 백금 d-밴드의 페르미 레벨 변화를 통한 전자적 특성변화 그리고 이작용기(bifunctional)의 효과가 일산화탄소의 전기화학적 산화반응에 대한 활성을 증진시켰다고 사료된다.
The electrocatalytic oxidation of CO was studied using carbon-supported 20 wt% PtRu (PtRu/C) catalysts, which were prepared with different Pt : Ru atomic ratios from 7 : 3 to 3 : 7 using a colloidal method combined with a freeze-drying procedure. The bimetallic PtRu/C catalysts were characterized by various physicochemical analyses, including X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS). CO stripping voltammetry measurements indicated that the addition of Ru with a Pt catalyst significantly improved the electrocatalytic activity for CO electrooxidation. Among the tested catalysts, the Pt5Ru5/C catalyst had the lowest onset potential (vs.Ag/AgCl) and the largest CO EAS. Structural modification via lattice parameter change and electronic modification in the unfilled d band states for Pt atoms may facilitate the electrooxidation of CO.
Keywords:PEMFC;PtRu catalyst;Carbon monoxide;CO tolerant
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