Platinum-Coated Palladium Nanotubes as Oxygen Reduction Reaction Electrocatalysts
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- 作者：Shaun M. Alia ; Kurt O. Jensen ; Bryan S. Pivovar ; Yushan Yan
- 刊名：ACS Catalysis
- 出版年：2012
- 出版时间：May 4, 2012
- 年：2012
- 卷：2
- 期：5
- 页码：858-863
- 全文大小：367K
- 年卷期：v.2,no.5(May 4, 2012)
- ISSN：2155-5435
文摘
Platinum (Pt) coated palladium (Pd) nanotubes (Pt/PdNTs) with a wall thickness of 6 nm, outer diameter of 60 nm, and length of 5鈥?0 渭m are synthesized via the partial galvanic displacement of Pd nanotubes. Pt coatings are controlled to a loading of 9 (PtPd 9), 14 (PtPd 14), and 18 (PtPd 18) wt % and estimated to have a thickness of 1.1, 1.7, and 2.2 Pt atoms, respectively, if a uniform and continuous coating is assumed. Oxygen reduction experiments have been used to evaluate Pt/PdNTs, Pt nanotubes, Pd nanotubes, and supported Pt nanoparticle activity for proton exchange membrane fuel cell cathodes. The dollar and area (specific surface area) normalized ORR activities of Pt/PdNTs exceed the United States Department of Energy (DOE) targets. PtPd 9, PtPd 14, and PtPd 18 produce dollar activities of 10.4, 9.4, and 8.7 A$鈥?, respectively; PtPd 9 exceeds the DOE dollar activity target (9.7 A$鈥?) by 7%. Pt/PdNTs further exceed the DOE area activity target by 40鈥?3%.