Catalytic oxidation of formaldehyde on ultrathin Co3O4 nanosheets at room temperature: Effect of enhanced active sites exposure on reaction path

Rong Li, Xianjin Shi, Yu Huang (Corresponding Author), Meijuan Chen, Dandan Zhu, Wingkei Ho, Junji Cao, Shuncheng Lee

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

This research precisely controlled the thickness of Co3O4 nanosheets to investigate the effect of active sites exposure on the reaction path of HCHO catalytic oxidation. X-ray absorption fine structure demonstrates that ultrathin Co3O4 nanosheets (Co3O4-2) with atomic layer thickness (~2 nm) exhibit stronger lattice disorder than Co3O4 nanosheets with a thickness of 20 nm (Co3O4-20). Aberration-corrected scanning transmission electron microscopy confirms that two-dimensional structure and disordered structure of Co3O4-2 enhances the surface exposure of active sites (Co3+ and oxygen vacancies). Therefore, Co3O4-2 can produce more reactive oxygen species, avoiding the side reaction path dominated by undesired intermediates over Co3O4-20, where active sites are blocked and HCHO oxidation is inhibited. Consequently, the HCHO removal efficiency (>90%) and CO2 conversion efficiency (>90%) of Co3O4-2 are substantially higher than thicker Co3O4 nanosheets. This research provides an effective strategy to construct active sites and deep insights into the reaction path.
Original languageEnglish
Article number121902
JournalApplied Catalysis B: Environmental
Volume319
DOIs
Publication statusPublished - 15 Dec 2022

Keywords

  • Cobalt oxides
  • Ultrathin nanosheets
  • Active sites
  • Formaldehyde
  • Reaction path

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