Forming a Highly Active, Homogeneously Alloyed AuPt Co-catalyst Decoration on TiO2 Nanotubes Directly during Anodic Growth

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

12 Scopus Citations
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Author(s)

  • Haidong Bian
  • Nhat Truong Nguyen
  • Jeongeun Yoo
  • Seyedsina Hejazi
  • Shiva Mohajernia
  • Julian Müller
  • Erdmann Spiecker
  • Hiroaki Tsuchiya
  • Ondrej Tomanec
  • Beatriz E. Sanabria-Arenas
  • Radek Zboril
  • Patrik Schmuki

Detail(s)

Original languageEnglish
Pages (from-to)18220-18226
Journal / PublicationACS Applied Materials and Interfaces
Volume10
Issue number21
Online published9 May 2018
Publication statusPublished - 30 May 2018

Abstract

Au and Pt do not form homogeneous bulk alloys as they are thermodynamically not miscible. However, we show that anodic TiO2 nanotubes (NTs) can in situ be uniformly decorated with homogeneous AuPt alloy nanoparticles (NPs) during their anodic growth. For this, a metallic Ti substrate containing low amounts of dissolved Au (0.1 atom %) and Pt (0.1 atom %) is used for anodizing. The matrix metal (Ti) is converted to oxide, whereas at the oxide/metal interface direct noble metal particle formation and alloying of Au and Pt takes place; continuously these particles are then picked up by the growing nanotube wall. In our experiments, the AuPt alloy NPs have an average size of 4.2 nm, and at the end of the anodic process, these are regularly dispersed over the TiO2 nanotubes. These alloyed AuPt particles act as excellent co-catalyst in photocatalytic H2 generation, with a H2 production rate of 12.04 μL h-1 under solar light. This represents a strongly enhanced activity as compared to TiO2 NTs decorated with monometallic particles of Au (7 μL h-1) or Pt (9.96 μL h-1).

Research Area(s)

  • anodization, AuPt alloy nanoparticle, H2 evolution, photocatalysis, TiO2 nanotubes

Citation Format(s)

Forming a Highly Active, Homogeneously Alloyed AuPt Co-catalyst Decoration on TiO2 Nanotubes Directly during Anodic Growth. / Bian, Haidong; Nguyen, Nhat Truong; Yoo, Jeongeun; Hejazi, Seyedsina; Mohajernia, Shiva; Müller, Julian; Spiecker, Erdmann; Tsuchiya, Hiroaki; Tomanec, Ondrej; Sanabria-Arenas, Beatriz E.; Zboril, Radek; Li, Yang Yang; Schmuki, Patrik.

In: ACS Applied Materials and Interfaces, Vol. 10, No. 21, 30.05.2018, p. 18220-18226.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review