Room-Temperature Preparation of Platinized Nonstoichiometric Tungsten Oxide via Platinum Photodeposition Followed by Chemical Reduction: Kinetic Enhancement of Photocatalytic Oxidation and Disinfection under Low-Intensity Visible-Light Irradiation

Jaesung Kim, Hongshin Lee, Minjeong Kim, Yong Yoon Ahn, Young Jin Ko, Hyung Suk Oh, Minseok Kang, Myoung Won Chung, Seunghyun Weon, Min Cho, Hangil Lee, Jaesang Lee

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Oxygen vacancy (OV) as the key site in promoting charge separation and visible-light harvesting in WO3 has often been created through thermal annealing. However, this study proposes the sequential combination of Pt photodeposition followed by chemical reduction using NaBH4 as a room-temperature approach to fabricate platinized oxygen vacant tungsten oxide (Pt/WO3-x). OVs (or low-valence tungsten), detected using multispectroscopic techniques, occurred by catalytic hydrogenation featuring atomic hydrogen generated via H2 (evolved from NaBH4 hydrolysis) dissociation on surface-loaded Pt nanoparticles. The Pt phase necessity for H2 splitting was supported based on the enhanced photocatalytic performance achieved when Pd photodeposition and hydrogen annealing were alternatively adopted as pre- and post-treatment steps, respectively. The superiority of Pt/WO3-x over stoichiometric counterparts in terms of photocatalytic activity for aqueous-phase organic oxidation was demonstrated by a comparative assessment with varied Pt contents, light intensities, and target substrates. This aligned with the improved efficiency of Pt/WO3-x for the photocatalytic decomposition of gaseous toluene and the inactivation of pathogenic microorganisms. Together with negligible performance loss and minor variation in tungsten/oxygen valences during repeated use, marked enhancement in the visible-light activity of Pt/WO3-x via OV implantation at room temperature implied the potential of the proposed two-step method to produce oxygen-defective metal oxides.

Original languageEnglish
Pages (from-to)1770-1786
Number of pages17
JournalACS ES and T Engineering
Volume3
Issue number11
DOIs
Publication statusPublished - 2023 Nov 10

Bibliographical note

Publisher Copyright:
© 2023 American Chemical Society.

Keywords

  • catalytic hydrogenation
  • oxygen vacancy
  • photocatalysis
  • platinized tungsten suboxides
  • visible-light responsivity

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Environmental Chemistry
  • Process Chemistry and Technology
  • Chemical Health and Safety

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