Morphology and CO Oxidation Activity of Pd Nanoparticles on SrTiO3 Nanopolyhedra

Bor Rong Chen, Lawrence A. Crosby, Cassandra George, Robert M. Kennedy, Neil M. Schweitzer, Jianguo Wen, Richard P. Van Duyne, Peter C Stair, Kenneth R Poeppelmeier, Laurence D. Marks, Michael J. Bedzyk

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Single crystal SrTiO3 nanocuboids having primarily TiO2-(001) surfaces and nanododecahedra having primarily (110) surfaces were created by two separate hydrothermal synthesis processes. Pd nanoparticles grown on the two sets of STO nanopolyhedra by atomic layer deposition show different morphologies and CO oxidation performance. Transmission electron microscopy and small-angle X-ray scattering show that 2-3 nm Pd nanoparticles with 3-5 nm interparticle distances decorate the STO surfaces. When the number of ALD cycles increases, the growth of the Pd nanoparticles is more significant in size on TiO2-(001)-STO surfaces, while that on (110)-STO surfaces is more predominant in number. High resolution electron microscopy images show that single crystal and multiply twinned Pd nanoparticles coexist on both types of the STO nanopolyhedra and exhibit different degrees of adhesion. The CO oxidation reaction, which was employed to determine the dependence of catalytic activity, showed that the Pd catalytic performance was dominated by the coverage of CO, which is more directly related to Pd nanoparticle size than to shape. CO turnover frequency analysis and diffuse reflectance infrared Fourier transform spectroscopy show that regardless of the shape or degrees of wetting, larger Pd nanoparticles (∼3 nm) have lower catalytic activity due to high CO coverage on nanoparticle facets. Smaller nanoparticles (∼2 nm) have more edge and corner sites and exhibit 2-3 times higher TOF at 80 and 100 °C.

Original languageEnglish
Pages (from-to)4751-4760
Number of pages10
JournalACS Catalysis
Volume8
Issue number6
DOIs
Publication statusPublished - Jun 1 2018

Fingerprint

Carbon Monoxide
Nanoparticles
Oxidation
Catalyst activity
Single crystals
strontium titanium oxide
Atomic layer deposition
High resolution electron microscopy
Hydrothermal synthesis
X ray scattering
Fourier transform infrared spectroscopy
Wetting
Adhesion
Transmission electron microscopy

Keywords

  • atomic layer deposition
  • CO oxidation
  • diffuse reflectance infrared Fourier transform spectroscopy
  • heterogeneous catalysts
  • palladium
  • strontium titanate
  • X-ray absorption near edge structure
  • X-ray small angle scattering

ASJC Scopus subject areas

  • Catalysis

Cite this

Chen, B. R., Crosby, L. A., George, C., Kennedy, R. M., Schweitzer, N. M., Wen, J., ... Bedzyk, M. J. (2018). Morphology and CO Oxidation Activity of Pd Nanoparticles on SrTiO3 Nanopolyhedra. ACS Catalysis, 8(6), 4751-4760. https://doi.org/10.1021/acscatal.7b04173

Morphology and CO Oxidation Activity of Pd Nanoparticles on SrTiO3 Nanopolyhedra. / Chen, Bor Rong; Crosby, Lawrence A.; George, Cassandra; Kennedy, Robert M.; Schweitzer, Neil M.; Wen, Jianguo; Van Duyne, Richard P.; Stair, Peter C; Poeppelmeier, Kenneth R; Marks, Laurence D.; Bedzyk, Michael J.

In: ACS Catalysis, Vol. 8, No. 6, 01.06.2018, p. 4751-4760.

Research output: Contribution to journalArticle

Chen, BR, Crosby, LA, George, C, Kennedy, RM, Schweitzer, NM, Wen, J, Van Duyne, RP, Stair, PC, Poeppelmeier, KR, Marks, LD & Bedzyk, MJ 2018, 'Morphology and CO Oxidation Activity of Pd Nanoparticles on SrTiO3 Nanopolyhedra', ACS Catalysis, vol. 8, no. 6, pp. 4751-4760. https://doi.org/10.1021/acscatal.7b04173
Chen BR, Crosby LA, George C, Kennedy RM, Schweitzer NM, Wen J et al. Morphology and CO Oxidation Activity of Pd Nanoparticles on SrTiO3 Nanopolyhedra. ACS Catalysis. 2018 Jun 1;8(6):4751-4760. https://doi.org/10.1021/acscatal.7b04173
Chen, Bor Rong ; Crosby, Lawrence A. ; George, Cassandra ; Kennedy, Robert M. ; Schweitzer, Neil M. ; Wen, Jianguo ; Van Duyne, Richard P. ; Stair, Peter C ; Poeppelmeier, Kenneth R ; Marks, Laurence D. ; Bedzyk, Michael J. / Morphology and CO Oxidation Activity of Pd Nanoparticles on SrTiO3 Nanopolyhedra. In: ACS Catalysis. 2018 ; Vol. 8, No. 6. pp. 4751-4760.
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