Photochemical Deposition of Highly Dispersed Pt Nanoparticles on Porous CeO2 Nanofibers for the Water-Gas Shift Reaction

Ping Lu, Botao Qiao, Ning Lu, Dong Choon Hyun, Jinguo Wang, Moon J. Kim, Jingyue Liu, Younan Xia

Research output: Contribution to journalArticle

48 Scopus citations

Abstract

Ceria (CeO2) nanofibers with high porosity are fabricated using an approach involving sol-gel, electrospinning, and calcination. Specifically, cerium(III) acetylacetonate and polyacrylonitrile (PAN) are dissolved in N,N-dimethylformamide (DMF) and then electrospun into nanofibers. The PAN matrix plays a critical role in stabilizing the porous structure from collapse during calcination in air up to 800 C. CeO2 porous nanofibers comprising an interconnected network of single crystalline and fully oxidized CeO2 nanoparticles about 40 nm in size are obtained. The hierarchically porous structure of the CeO2 nanofibers enables the facile deposition of Pt nanoparticles via heterogeneous nucleation in a photochemical method. When conducted in the presence of poly(vinyl pyrrolidone) (PVP) and 4-benzyolbenzoic acid, uniform Pt nanoparticles with an average diameter of 1.7 nm are obtained, which are evenly dispersed across the entire surface of each CeO2 nanofiber. The high porosity of CeO2 nanofibers and the uniform distribution of Pt nanoparticles greatly improve the activity and stability of this catalytic system toward the water-gas shift reaction. It is believed that this method could be extended to produce a variety of catalysts and systems sought for various industrial applications.

Original languageEnglish (US)
Pages (from-to)4153-4162
Number of pages10
JournalAdvanced Functional Materials
Volume25
Issue number26
DOIs
StatePublished - Jul 1 2015

Keywords

  • photochemical reduction
  • platinum nanoparticles
  • porous ceria nanofibers
  • water-gas shift reaction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Condensed Matter Physics
  • Electrochemistry

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