Nanoporous Pt-Co Alloy Nanowires: Fabrication, Characterization, and Electrocatalytic Properties
Nanoporous Pt-Co Alloy Nanowires: Fabrication, Characterization, and Electrocatalytic Properties
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DOI：
10.1021/nl902619q
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发表时间：
2009-12-01
期刊：
影响因子：
10.8
通讯作者：
Goesele, Ulrich
中科院分区：
文献类型：
--
作者：
Liu, Lifeng;Pippel, Eckhard;Goesele, Ulrich
通过电沉积富钴Pt 1Co 99合金到阳极氧化铝（AAO）膜上，然后在弱酸性介质中进行去合金化处理，制备了纳米多孔Pt-Co合金纳米线。这些纳米线由具有1-5 nm的微孔的多孔骨架和2-8 nm的晶体韧带组成。研究了多孔Pt-Co纳米线在脱合金过程中的形貌和成分变化，并对其形成机理进行了探讨。纳米多孔Pt-Co合金纳米线被发现表现出明显增强的电催化活性对甲醇氧化相比，目前国家的最先进的PVC和PtCo/C催化剂，从而显示出实质性的承诺，作为有效的阳极电催化剂在直接甲醇燃料电池。
Nanoporous Pt-Co alloy nanowires were synthesized by electrodeposition of Co-rich Pt1Co99 alloy into anodic aluminum oxide (AAO) membranes, followed by a dealloying treatment in a mild acidic medium. These nanowires consist of porous skeletons with tiny pores of 1-5 nm and crystalline ligaments of 2-8 nm. Morphological and compositional evolutions of the porous Pt-Co nanowires upon dealloying were investigated, and their formation mechanism is discussed. The nanoporous Pt-Co alloy nanowires are found to exhibit distinctly enhanced electrocatalytic activities toward methanol oxidation as compared to the current state-of-the-art PVC and PtCo/C catalysts, thus showing substantial promise as efficient anode electrocatalysts in direct methanol fuel cells.