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제128회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Effects of Shape and Hydriding for Palladium Nanocatalyst toward Oxygen Electroreduction Reaction

등록일
2021년 8월 18일 17시 04분 16초
접수번호
2953
발표코드
ELEC.P-505 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
10월 14일 (목요일) 11:00~12:30
발표형식
포스터
발표분야
Electrochemistry
저자 및
공동저자
Mrinal kanti Kabiraz, Jeonghyeon Kim, Sang-Il Choi1,*
Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, Korea
1Department of Chemistry, Kyungpook National University, Korea
Proton exchange membrane fuel cells (PEMFCs) is considered one of the cleanest and most efficient energy conversion device. Oxygen reduction reaction (ORR) occurring at the cathode of PEMFCs has been acknowledged as the primary bottleneck due to the sluggish electron-transfer kinetics that limits the cell efficiency. While platinum (Pt) based catalysts are regarded as the most active catalyst toward the ORR, palladium (Pd) has also drawn significant attention as potential electrocatalysts in acidic and alkaline media. This study represents Pd octahedra and cubes enclosed by {111} and {100} facets, respectively, and their hydride forms (PdH) as model catalysts, which were synthesized to probe the shape and composition effects on ORR. The hydriding effect improved the ORR performance on the PdH octahedra compared with Pd octahedra. On the other hand, PdH cubes showed a decrement in ORR activity compared to Pd cubes. The opposite trend of the hydriding effect in relation to shape was explained with Sabatier’s principle, where the optimal OH binding strength of nanocatalyst governs ORR activity.

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