title: Simultaneous tunable structure and composition of PtAg alloyed nanocrystals as superior catalysts.
abstract: PtAg alloyed nanostructural catalysts were firstly prepared by co-reduction of AgNO3 and H2PtCl6 precursors in growth solution using a seed-mediated method. By simply changing the molar ratio of the metal precursors, the morphologies of the porous alloyed nanocrystals can be tuned from multipetals to multioctahedra. Simultaneously, the alloy composition can be varied from Pt76Ag24 to Pt66Ag34. The catalytic properties of the prepared PtAg alloyed nanocrystals with a tunable structure and composition were tentatively examined by choosing the reduction of 4-nitrophenol with NaBH4. The reaction rate normalized to the concentration of catalysts was calculated to be 318.9 s(-1) mol(-1) L and 277.4 s(-1) mol(-1) L for Pt70Ag30 and Pt66Ag34 porous catalysts, which is much higher than the pure Pt catalysts. Moreover, PtAg nanostructures can also serve as efficient electrocatalysts toward the methanol oxidation reaction, especially for Pt70Ag30 and Pt66Ag34 porous nanocrystals. The electrocatalytic activity and the durability were both highly enhanced compared to the commercial Pt/C catalyst. In addition, we also investigated the enhancement mechanism.
authors.affiliation: College of Chemistry and Materials Science, The Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecular-Based Materials, Anhui Normal University, Wuhu, Anhui Province 241000, China. chfang@mail.ahnu.edu.cn.
authors.forename: Caihong
authors.initials: C
authors.lastname: Fang
authors.affiliation: College of Chemistry and Materials Science, The Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecular-Based Materials, Anhui Normal University, Wuhu, Anhui Province 241000, China. chfang@mail.ahnu.edu.cn.
authors.forename: Jun
authors.initials: J
authors.lastname: Zhao
authors.affiliation: College of Chemistry and Materials Science, The Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecular-Based Materials, Anhui Normal University, Wuhu, Anhui Province 241000, China. chfang@mail.ahnu.edu.cn.
authors.forename: Guili
authors.initials: G
authors.lastname: Zhao
authors.affiliation: College of Chemistry and Materials Science, The Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecular-Based Materials, Anhui Normal University, Wuhu, Anhui Province 241000, China. chfang@mail.ahnu.edu.cn.
authors.forename: Long
authors.initials: L
authors.lastname: Kuai
authors.affiliation: College of Chemistry and Materials Science, The Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecular-Based Materials, Anhui Normal University, Wuhu, Anhui Province 241000, China. chfang@mail.ahnu.edu.cn.
authors.forename: Baoyou
authors.initials: B
authors.lastname: Geng