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  • 09월 10일 16시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제124회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Pore size effects on the oxygen-involving electrocatalysis in truncated CoFe nanocubes

2019년 8월 22일 14시 00분 27초
ELEC.P-419 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 17일 (목요일) 11:00~12:30
저자 및
Sujin Jo, Sunguk Noh, Jun Ho Shim*
Department of Chemistry, Daegu University, Korea
Porous nanomaterials can be synthesized following a number of chemical and physicochemical methods, such as hydrothermal, surfactant-based templating, sol-gel, and templated growth etc. According to the IUPAC classification, the pore size (diameter d) can be divided into three categories: micro- (d < 2 nm), meso- (2 nm < d < 50 nm), and macroporous materials (d > 50 nm). Herein, we synthesized truncated CoFe nanocubes with two different pore sizes, i.e. mi-CoFe (average d = 1.0 nm) and me-CoFe (average d = 31.5 nm). The materials with tunable porosity are investigated as electrocatalysts for the oxygen evolution and oxygen reduction reactions (OER/ORR). The me-CoFe catalysts catalyzed the ORR via the efficient 4-electron process, whereas the mi-CoFe sample exhibited superior catalytic activity than the commercial Ir/C for OER. The electrocatalytic activity of the truncated CoFe nanocubes for oxygen-involving reactions in alkaline media was investigated by rotating disk electrode, rotating ring-disk electrode, and cyclic voltammetry. The compositional/structural features are characterized by high-resolution transmission electron microscopy, Brunauer-Emmett-Teller analysis, Fourier transform infrared and UV-Vis spectroscopy, X-ray photoelectron spectroscopy, and X-ray diffraction. This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2019R1F1A1049614).