| 학회 |
한국화학공학회 |
| 학술대회 |
2012년 가을 (10/24 ~ 10/26, 부산 BEXCO) |
| 권호 |
18권 2호, p.2547 |
| 발표분야 |
촉매 및 반응공학 |
| 제목 |
Coverage Dependent Catalytic Activity of Platinum on Gold Nano-octahedra : From Single Atoms to Multiple Layers |
| 초록 |
Platinum was deposited on gold octahedral nanoparticles using an electrochemical method. The coverage of platinum on the gold surface was controlled from atomically dispersed sub-monolayer to fully covered multiple layers. CO stripping, oxide formation and reduction and X-ray photoelectron spectroscopy was conducted to evaluate nanostructure of the deposited platinum. Formic acid oxidation and methanol oxidation were conducted to evaluate their catalytic activity and showed completely opposite trend. Catalytic activity of formic acid oxidation greatly increased by two orders of magnitude (0.40 A mg-1Pt for 5 ML and 65.2 A mg-1Pt for 0.05 ML) with decreasing coverage. This high activity resulted from the control toward direct pathway producing no surface-poisoning (CO) species, helped by anti-ensemble effect of isolated Pt atoms and bifunctional effect of neighboring Pt-Au sites. On the other hand, catalytic activity of methanol oxidation was increased with increasing coverage. |
| 저자 |
양성은, 김지환, 이현주
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| 소속 |
연세대 |
| 키워드 |
Nanocatalyst; Au-Pt; Formic acid oxidation; Atomic catalyst; Pt minimization
|
| E-Mail |
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| 원문파일 |
초록 보기 |
