Hierarchical Nanoporous PtFe Alloy with Multimodal Size Distributions and Its Catalytic Performance toward Methanol Electrooxidation

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• 作者：Caixia Xu ; Qian Li ; Yunqing Liu ; Jinping Wang ; Haoran Geng
• 刊名：Langmuir
• 出版年：2012
• 出版时间：January 24, 2012
• 年：2012
• 卷：28
• 期：3
• 页码：1886-1892
• 全文大小：463K
• 年卷期：v.28,no.3(January 24, 2012)
• ISSN：1520-5827

文摘

The hierarchical nanoporous (NP) PtFe alloy with multimodal size distributions is straightforwardly fabricated by means of mild de-alloying of the PtFeAl source alloy. This interesting NP structure consists of interconnected larger ligaments around hundreds of nanometers, in which these ligaments are also composed of the three-dimensional network structure with the typical size at 3 nm. In comparison to NP-Pt and Pt/C catalysts, the as-made alloy nanostructure exhibits superior electrocatalytic activity for the methanol oxidation reaction (MOR) with higher catalytic durability and CO tolerance besides the enhanced specific and mass activity. NP-PtFe also shows improved structure stability with the less loss of the electrochemical surface area of Pt upon long-term potential scan in acidic solution. X-ray photoelectron spectroscopy and density functional theory calculations demonstrate that the incorporation of Fe appropriately modified the electron structure of Pt with the downshift of the Pt d-band center, leading to a decreased CO poisoning and an improved MOR activity.