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  • 09월 05일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제120회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Size and shape-dependent catalytic performance of gold nanostructures

2017년 8월 23일 16시 42분 46초
ELEC.P-460 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 20일 (금요일) 13:00~14:30
저자 및
Hyunjun An, JUN HO SHIM*
Department of Chemistry, Daegu University, Korea
Nanomaterials are used widely in a range of electrochemical applications, such as electrocatalysis, electrochemical analysis, and electrochemical synthesis, owing to their physical and chemical properties. Versatile synthetic routes to nanomaterials have been developed to allow control of the morphology, structure and surface chemistry, which are crucial parameters in both fundamental studies and applications. In the present study, a series of well-defined core-satellite Au nanoassemblies (CSNs) with different porosities, i.e. with the core-to-satellite gap distance controlled on a molecular scale, were synthesized. The effects of the interparticle distances on the ORR efficiency of the catalysts derived from the CSNs were investigated systematically by varying the length of the alkanedithiol molecular linkers (HS(CH2)nSH; n = 4, 8, 10). The series of as-prepared CSNs catalysts on carbon supports are denoted as CSNs(n)/C based on the length of the chain between the core and the satellites. This simple method is significant in preparing high-performance metal nanocatalysts with a well-controlled morphology, i.e. emphasizing the importance of tailored porosity in heterogeneous catalysis. Indeed, the electrocatalytic activity depends not only on the active site, but also on the surface morphology, particle sizes and surface area to volume ratio. The as-prepared CSNs exhibited unexpectedly high catalytic activity and a dominant four-electron pathway towards the ORR. This research was also supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2016R1D1A1B03930895).