title: Hierarchical nanoporous PtFe alloy with multimodal size distributions and its catalytic performance toward methanol electrooxidation.
abstract: 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.
authors.affiliation: Key Laboratory of Chemical Sensing and Analysis in Universities of Shandong, University of Jinan, School of Chemistry and Chemical Engineering, Jinan 250022, People's Republic of China. chm_xucx@ujn.edu.cn
authors.forename: Caixia
authors.initials: C
authors.lastname: Xu
authors.forename: Qian
authors.initials: Q
authors.lastname: Li
authors.forename: Yunqing
authors.initials: Y
authors.lastname: Liu
authors.forename: Jinping
authors.initials: J
authors.lastname: Wang
authors.forename: Haoran
authors.initials: H
authors.lastname: Geng