화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Applied Chemistry for Engineering, Vol.23, No.6, 561-566, December, 2012
Export Citation
메탄올 전기산화반응 증진을 위한 PtRuW/C 촉매에서 텅스텐의 효과에 관한 연구
Effect of Tungsten on PtRuW/C Catalysts for Promoting Methanol Electro-oxidation
노창수, 손정민1, †, 박영권2
  • 전북대학교 수소연료전지공학과
  • 1전북대학교 자원⋅에너지공학과
  • 2서울시립대 환경공학부
Chang Soo Noh, Jung Min Sohn1, †, and Young-Kwon Park2
  • Department of Hydrogen and Fuel Cells Engineering, Specialized Graduate School, Chonbuk National University, Jeonju 561-756, Korea
  • 1Department of Mineral Resources & Energy Engineering, Chonbuk National University, Jeonju 561-756, Korea
  • 2Faculty of Environmental Engineering, University of Seoul, Seoul 130-743, Korea
E-mail:
초록
PtRuW/C 촉매를 Pt : Ru : W 비를 5 : 4 : 1, 2 : 1 : 1, 1 : 1 : 1, 1 : 2 : 2로 각각 합성하였다. 촉매의 조성은 EDX분석을 통해 이론값과 비슷하다는 것을 확인하였다. TEM분석과 XRD분석으로부터 3.5∼5.5 nm의 균일한 입자 크기 및 결정질 분포를 가지고 있음을 확인하였다. 유효표면적, 전류밀도, 고유 활성 및 피독률과 같은 전기화학적 특성은 CO 스트리핑, 선형쓸음 전기량 측정법, 대시간 전류법 등과 같은 방법으로 분석하였다. 이러한 분석으로부터, PtRu2W2/C를 제외한 촉매는 상업촉매보다 우수한 반응성과 안정성을 가지고 있음을 확인하였다. 이 중 가장 우수한 촉매는 Pt5Ru4W/C였으며, 121.05 mAㆍm ^(-2)의 specific activity와 0.01%ㆍs^(-1)의 피독률을 보였다.
PtRuW/C catalysts were prepared with the different molar ratios of Pt : Ru : W and their compositions were analyzed by energy dispersive X-ray (EDX). The uniform distribution of particles was observed using transmission electron microscopy (TEM). An average crystalline size of 3.5∼5.5 nm was calculated based on x-ray diffraction (XRD) data. The electrochemical properties such as electrochemically active surface areas, current densities, specific activities and poisoning rates, were analyzed via CO stripping, linear sweep voltammetry and chronoamperometry. From the analysis, we observed that ternary alloy catalysts, except PtRu2W2/C, have higher current densities, specific activities and stabilities than those of commercial binary catalysts. Among all in-house catalysts, Pt5Ru4W/C showed the highest specific activity of 121.05 mAㆍm^(-2) and the lowest poisoning rate of 0.01 %ㆍs^(-1).
Keywords:methanol electro-oxidation;ternary catalyst;PtRuW;tungsten effect;direct methanol fuel cell
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