New hydrogen-evolution heteronanostructured photocatalysts: Pt-Nb 3O7(OH) and Cu-Nb3O7(OH)

Mohamad Hmadeh, Veronika Hoepfner, Eduardo Larios, Kristine Liao, Jia Jia, Miguel Jose-Yacaman, Geoffrey A. Ozin

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Nanorods of triniobium hydroxide heptaoxide, Nb3O 7(OH), were synthesized by means of a hydrothermal method. Subsequently, Pt and CuO nanoparticles were introduced on the surface of Nb 3O7(OH) nanorods by a microwave-assisted solvothermal nucleation and growth technique. The resulting Pt- and CuO-decorated Nb 3O7(OH) nanorods demonstrated uniform particle dispersion and were fully characterized by X-ray diffraction, electron microscopy, and spectroscopic analysis. Furthermore, the solar-powered photocatalytic hydrogen production properties of these heteronanostructures were studied. The solar-driven H2 formation rate over Pt-Nb3O 7(OH) was determined to be 710.4±1.7 μmol g-1 h-1 with a quantum efficiency of φ=5.40 % at λ=380 nm. Interestingly, the as-prepared CuO-Nb3O7(OH) heteronanostructure was found to be inactive under solar irradiation during an induction phase, whereupon it undergoes an in situ photoreduction process to form the photocatalytically active Cu-Nb3O7(OH). This restructuring process was monitored by an in situ measurement of the time-evolution of the optical absorption spectra. The solar-powered H 2 production for the restructured compound was determined to be 290.3±5.1 μmol g-1 h-1.

Original languageEnglish (US)
Pages (from-to)2104-2109
Number of pages6
JournalChemSusChem
Volume7
Issue number8
DOIs
StatePublished - Aug 2014
Externally publishedYes

Keywords

  • heteronanostructure
  • hydrogen production
  • photocatalysis
  • triniobium hydroxide heptaoxide

ASJC Scopus subject areas

  • Environmental Chemistry
  • Chemical Engineering(all)
  • Materials Science(all)
  • Energy(all)

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