Pt@Nb-TiO2 catalyst membranes fabricated by electrospinning and atomic layer deposition

Qing Du, Jianbo Wu, Hong Yang

Research output: Contribution to journalArticle

Abstract

A facile method was developed to fabricate fibrous membranes of niobium-doped titania-supported platinum catalysts (Pt@Nb-TiO2) by a two-step approach. The process started with generating niobium-doped titania (Nb-TiO2) fibrous membranes by electrospinning, followed by the deposition of Pt nanoparticles (NPs) using an atomic layer deposition (ALD) technique. The area-specific oxygen reduction reaction (ORR) activity of Pt@TiO2 catalyst membrane was increased by ∼20 folds if 10 at.% of Nb was incorporated into the ceramic fibers. The area-specific activity also increased with the number of ALD cycles, because of the increase of the Pt loading in the catalysts. After post-treatment of the catalyst membrane at high temperature in H2-containing atmosphere, the ORR activity became 0.28 mA/cm2Pt at 0.9 V (vs RHE), because of the improvement in conductivity of Nb-TiO2 fibers and better crystalinity of Pt NPs. The results of accelerated-stability test showed that the Pt@Nb-TiO2 catalyst membrane was highly stable and lost only 10% of its initial activity after 30 000 potential cycles (0.6 to 1.0 V vs RHE) under a strong acidic condition.

Original languageEnglish (US)
Pages (from-to)144-151
Number of pages8
JournalACS Catalysis
Volume4
Issue number1
DOIs
StatePublished - Jan 3 2014

Keywords

  • ALD
  • ORR
  • Pt nanoparticle
  • atomic layer deposition
  • electrospinning
  • membrane
  • titania

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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