Au-NPs embedded Z–scheme WO3/TiO2 nanocomposite for plasmon-assisted photocatalytic glycerol-water reforming towards enhanced H2 evolution

Muhammad Tahir, Mohammad Siraj, Beenish Tahir, Muhammad Umer, Hajar Alias, N. Othman

Research output: Contribution to journalArticlepeer-review

86 Citations (Scopus)

Abstract

Au-NPs-embedded Z-scheme WO3/TiO2 hetero-junction for boosting photocatalytic H2 evolution from glycerol-water mixture under visible light has been investigated. The composite samples, synthesized by a sol-gel assisted photo-deposition method, gave higher visible light absorption through Surface Plasmon Resonance (SPR), larger BET surface area and hindered recombination of charge carrier. Highest H2 evolution rate of 17200 ppm h−1 gcat−1 was obtained over 0.5%Au-loaded WO3/TiO2 which was 4.46 and 5.89 folds higher than WO3/TiO2 and TiO2, respectively. This divulges that constructing WO3/TiO2 Z-scheme hetero-junction adjusted redox potential, while decorating plasmonic Au-NPs enables faster charges separation with higher visible-light absorption through SPR, resulting in superior H2 production. In addition, both water splitting and photocatalytic glycerol reforming contributed towards excellent H2 formation. The apparent quantum yield of 28.3% (λ ~ 420 nm) was attained and catalyst prevailed photo-stability for H2 evolution in cyclic runs. This study provides new insight about constructing plasmonic assisted Z-scheme assembly for solar fuels production.

Original languageEnglish
Article number144344
JournalApplied Surface Science
Volume503
DOIs
Publication statusPublished - Feb 15 2020
Externally publishedYes

Keywords

  • Au surface plasmon resonance
  • Glycerol reforming
  • Photocatalytic H evolution
  • Z-scheme heterojunction, WO/TiO composite

ASJC Scopus subject areas

  • General Chemistry
  • Condensed Matter Physics
  • General Physics and Astronomy
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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