title: Monodispersed bimetallic PdAg nanoparticles with twinned structures: formation and enhancement for the methanol oxidation.
abstract: Monodispersed bimetallic PdAg nanoparticles can be fabricated through the emulsion-assisted ethylene glycol (EG) ternary system. Different compositions of bimetallic PdAg nanoparticles, Pd₈₀Ag₂₀, Pd₆₅Ag₃₅ and Pd₄₆Ag₅₄ can be obtained via adjusting the reaction parameters. For the formation process of the bimetallic PdAg nanoparticles, there have two-stage growth processes: firstly, nucleation and growth of the primary nanoclusters; secondly, formation of the secondary nanoparticles with the size-selection and relax process via the coalescence or aggregation of the primary nanoclusters. The as-prepared PdAg can be supported on the carbon black without any post-treatment, which exhibited high electro-oxidation activity towards methanol oxidation under alkaline media. More importantly, carbon-supported Pd₈₀Ag₂₀ nanoparticles reveal distinctly superior activities for the methanol oxidation, even if compared with commercial Pt/C electro-catalyst. It is concluded that the enhanced activity is dependant on the unique twinning structure with heterogeneous phase due to the dominating coalescence growth in EG ternary system.
authors.affiliation: State Key Laboratory of Hollow Fiber Membrane Materials and Processes, Department of Chemical Engineering, Tianjin Polytechnic University, Tianjin 300387, P. R. China.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Yin
authors.affiliation: Energy Storage Division, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P. R. China.
authors.forename: Yining
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Chemistry Experimental Teaching Center, University of Science and Technology of China, Hefei 230026, P. R. China.
authors.forename: Kai
authors.initials: K
authors.lastname: Chen
authors.affiliation: Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Li
authors.affiliation: Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
authors.forename: Wenjing
authors.initials: W
authors.lastname: Li
authors.affiliation: Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
authors.forename: Pei
authors.initials: P
authors.lastname: Tang
authors.affiliation: Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
authors.forename: Huabo
authors.initials: H
authors.lastname: Zhao
authors.affiliation: National Institute of Clean-And-Low-Carbon Energy, Beijing, 102209, China.
authors.forename: Qingjun
authors.initials: Q
authors.lastname: Zhu
authors.affiliation: State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P. R. China.
authors.forename: Xinhe
authors.initials: X
authors.lastname: Bao
authors.affiliation: Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
authors.forename: Ding
authors.initials: D
authors.lastname: Ma