AVS 64th International Symposium & Exhibition
    Surface Science Division Tuesday Sessions
       Session SS-TuP

Paper SS-TuP20
Controllable Synthesis of Ru/Pt Core Shell Nanoparticles with Bi-functional Interfaces towards PROX Reactions

Tuesday, October 31, 2017, 6:30 pm, Room Central Hall

Session: Surface Science Poster Session
Presenter: Yun Lang, Huazhong University of Science and Technology, PR China
Authors: Y. Lang, Huazhong University of Science and Technology, PR China
J.Q. Yang, Huazhong University of Science and Technology, PR China
K. Cao, Huazhong University of Science and Technology, PR China
M. Gong, Huazhong University of Science and Technology, PR China
B. Shan, Huazhong University of Science and Technology, PR China
R. Chen, Huazhong University of Science and Technology, PR China
Correspondent: Click to Email
Bimetallic nanoparticles (NPs) have attracted great attention due to their unique properties for catalytic applications. Compared with the physical mixture of monometallic NPs or alloyed bimetallic NPs, the formation of core shell structure could further enhance the activity, selectivity and stability. Synthesizing core shell NPs with well controlled shell thickness and composition is of great importance in optimizing their reactivity. Here we report synthesis of Ru/Pt core shell NPs using area-selective ALD techniques. The catalytic performance towards preferential oxidation of CO under excess H2 (PROX) reaction is studied with different Pt shell thickness. The catalytic activity of hybrid nanostructure can be tuned continuously with shell thickness originated from electron structure modification. Utilizing the lattice mismatch between Pt(111)/Ru(101), Pt(111) layer can be selectively deposited on Ru (001) facet while leaving Ru (101) uncovered. The exposure facets demonstrate two functions in PROX reaction, Pt(111) on Ru(001) decrease CO reaction barrier and Ru (101) increase active oxygen adsorption and dissociation. Both activity and selectivity towards PROX reaction have been enhanced compared with fully covered Ru/Pt core shell nanoparticles or their alloy.