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제124회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Influence of super activation on Nanoporous Au in alkaline solution

2019년 8월 15일 19시 36분 35초
ELEC.P-400 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 17일 (목요일) 11:00~12:30
저자 및
Gahyun Kim, Jongwon Kim*
Department of Chemistry, Chungbuk National University, Korea
In alkaline solution, the oxidation peak can found between 0.7 V and 1.1V (vs. Hg / HgO) before the oxygen evolution reaction (OER) at Au surface. This peak is the result of super activation. Super activated surfaces relate to the monomeric Au hydroxyls, which appear to be transient and be regarded as intermediates of β-oxides. Subsequently, Au hydroxyls form the peroxy. During the peroxy decomposition, oxygen is produced in the surface oxide layer. That is, OER occurs earlier than expected potential. Consequently, super activated Au can be used in the study of developing OER catalysts. In this work, Super activation results were observed using an electrode with a porous surface of Au. To create porous surface, Nanoporous gold (NPG) was produced using anodizing method that applied positive potential to Au. As a result of this study, It was confirmed unique transient response in the gold electrode, which is a porous surface. We also identified changes in peak current of transient response due to surface area changes in NPG. And then various methods of super activation for increasing the peak current were applied to NPG and we observed peak change phenomenon. And found the most effective super activation method for NPG electrodes.