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Title: Interrogation of bimetallic particle oxidation in three dimensions at the nanoscale

An understanding of bimetallic alloy oxidation is key to the design of hollow-structured binary oxides and the optimization of their catalytic performance. However, one roadblock encountered in studying these binary oxide systems is the difficulty in describing the heterogeneities that occur in both structure and chemistry as a function of reaction coordinate. This is due to the complexity of the three-dimensional mosaic patterns that occur in these heterogeneous binary systems. By combining real-time imaging and chemical-sensitive electron tomography, we show that it is possible to characterize these systems with simultaneous nanoscale and chemical detail. We find that there is oxidation-induced chemical segregation occurring on both external and internal surfaces. Additionally, there is another layer of complexity that occurs during the oxidation, namely that the morphology of the initial oxide surface can change the oxidation modality. As a result, this work characterizes the pathways that can control the morphology in binary oxide materials.
Authors:
 [1] ;  [2] ;  [3] ;  [2] ;  [3] ;  [4] ; ORCiD logo [2] ; ORCiD logo [2]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States); Tianjin Univ., Tianjin (China)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Huazhong Univ. of Science and Technology, Wuhan (China)
  4. Tianjin Univ., Tianjin (China)
Publication Date:
Report Number(s):
BNL-113674-2017-JA
Journal ID: ISSN 2041-1723; R&D Project: 16060; 16060; KC0403020
Grant/Contract Number:
SC00112704
Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Research Org:
Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; bimetallic particle oxidation three dimensions nanoscale; Center for Functional Nanomaterials; catalyst synthesis; characterization and analytical techniques; reaction kinetics and dynamics
OSTI Identifier:
1347382