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Surfactant-Free Synthesis of Three-Dimensional Perovskite Titania-Based Micron-Scale Motifs Used as Catalytic Supports for the Methanol Oxidation Reaction

Journal Article · · Molecules
 [1];  [2];  [3];  [2]
  1. State Univ. of New York (SUNY), Stony Brook, NY (United States). Dept. Chemistry; OSTI
  2. State Univ. of New York (SUNY), Stony Brook, NY (United States). Dept. Chemistry
  3. Fordham University, Bronx, NY (United States). Dept. of Chemistry
We synthesized and subsequently rationalized the formation of a series of 3D hierarchical metal oxide spherical motifs. Specifically, we varied the chemical composition within a family of ATiO3 (wherein “A” = Ca, Sr, and Ba) perovskites, using a two-step, surfactant-free synthesis procedure to generate structures with average diameters of ~3 microns. In terms of demonstrating the practicality of these perovskite materials, we have explored their use as supports for the methanol oxidation reaction (MOR) as a function of their size, morphology, and chemical composition. The MOR activity of our target systems was found to increase with decreasing ionic radius of the “A” site cation, in order of Pt/CaTiO3 (CTO) > Pt/SrTiO3 (STO) > Pt/BaTiO3 (BTO). With respect to morphology, we observed an MOR enhancement of our 3D spherical motifs, as compared with either ultra-small or cubic control samples. Moreover, the Pt/CTO sample yielded not only improved mass and specific activity values but also a greater stability and durability, as compared with both commercial TiO2 nanoparticle standards and precursor TiO2 templates.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC)
Grant/Contract Number:
SC0012704
OSTI ID:
1817042
Journal Information:
Molecules, Journal Name: Molecules Journal Issue: 4 Vol. 26; ISSN 1420-3049
Publisher:
MDPICopyright Statement
Country of Publication:
United States
Language:
English

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