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제106회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Increased Pt Stability and Activity for Oxygen Reduction via Alloy of Early Transition Metals

등록일
2010년 9월 15일 11시 42분 41초
접수번호
1643
발표코드
ELEC.O-5 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
금 11시 : 25분
발표형식
구두발표
발표분야
전기화학 - 신진 전기화학자 구두발표
저자 및
공동저자
유성종, 성영은1
한국과학기술연구원 연료전지센터, Korea
1서울대학교 화학생물공학부, Korea
Notwithstanding a polymer electrolyte membrane fuel cell (PEMFC) is a promising alternative device to reduce our reliance on environmentally unfriendly fossil fuel, there are several problems that should be overcome to make PEMFC more economically attractive. One of the most pivotal issues of problems is considerable overpotential associated with the slow reaction rate of the oxygen reduction reaction (ORR; (1/2O2 + 2(H+ + e- ) → H2O)) at the cathode. Other tremendous challenge is the stability for electrochemical reaction, including metal dissolution and surface oxide formation, which occurs intensely in acid medium (< pH 1) at high potential (> 0.8 V). In spite of the significant technological interest in finding active and stable catalyst for ORR condition, the direct experimental inspection of the contributions of the stability involving activity has rarely been investigated in electrochemical reduction of oxygen. Herein we report more active and stable electrocatalytic cathode materials consisting of Pt-based alloys involving late and early transition metals. In particular, we focused on the electronic and lattice-strain effect of the Pt-Y alloys for the purpose of analyzing the activity. To clarify these effects, we introduced a correlation between the d-band structure of Pt induced by its lattice-strain and the ORR activity. In addition, we investigated the stability on Pt-based binary alloy electrodes by applying the calculated heat of alloy formation closely relative to the degree of segregation, a descriptor for the stability of electrocatalysts. Our results show keys toward resolving serious problems to make PEMFC economically viable.

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