AVS 63rd International Symposium & Exhibition
    Surface Science Friday Sessions
       Session SS+HC-FrM

Paper SS+HC-FrM3
Design and Synthesis of Nanofence Cerium Oxide Coated Platinum Catalysts via Facet-selective Atomic Layer Deposition

Friday, November 11, 2016, 9:00 am, Room 104E

Session: Deposition and Analysis of Complex Interfaces
Presenter: Kun Cao, State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science and Technology, China
Authors: K. Cao, State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science and Technology, China
J.M. Cai, State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science and Technology, China
R. Chen, State Key Laboratory of Digital Manufacturing Equipment and Technology, School of Mechanical Science and Engineering, School of Optical and Electronic Information, Huazhong University of Science and Technology, China
Correspondent: Click to Email

Sintering of Pt nanoparticles (NPs) catalysts at elevated working temperature is highly undesirable, as coalescence of NPs will cause significant decrease in the number of active sites and resulting catalytic performance degradation. Oxide overcoating techniques have been recently developed to minimize Pt sintering. However, certain trade-off has to be made between stabilization and reactivity. Stabilize metal nanoparticles and simultaneously enhance catalytic activity is still very challenging.

Here, we designed a cerium oxide nanofence coating structure to stabilize Pt NPs using facet selective atomic layer deposition. The facet selectivity is realized through differences in binding energy of Ce precursor fragments Pt surfaces. CeOx prefers to selectively deposit on Pt (111) facets, while leaving the Pt (100) surface intact. CeOx has synergy with metal as coating layer and creates highly active sites at Pt-CeOx interfaces. From stability point of view, CeOx anchors Pt NPs with a strong metal oxide interaction, and nanofence coating layer provide physical blocking that suppresses NP particle migration. Such nanofence CeOx coated Pt catalysts show both enhanced CO conversion activity and improved sintering resistance up to 700 °C under oxidative atmospheric condition.