Facet-dependent cuprous oxide nanocrystals decorated with graphene as durable photocatalysts under visible light

Shou Heng Liu, Jun Sheng Lu

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Three morphologies (octahedral, hierarchical and rhombic dodecahedral) of crystal Cu2O with different facets ({111}, {111}/{110}, and {110}) incorporating graphene sheets (denoted as o-Cu2O-G, h-Cu2O-G and r-Cu2O-G, respectively) have been fabricated by using simple solution-phase techniques. Among these photocatalysts, the r-Cu2O-G possesses the best photocatalytic performance of 98% removal efficiency of methyl orange (MO) with outstanding kinetics for 120 min of visible light irradiation. This enhancement is mainly due to the dangling “Cu” atoms in the highly active {110} facets, resulting in the increased adsorption of negatively charged MO. More importantly, the unique interfacial structures of Cu2O rhombic dodecahedra connected to graphene nanosheets can not only decrease the recombination of electron-hole pairs but also stabilize the crystal structure of Cu2O, as verified by a series of spectroscopic analyses (e.g., X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM)). The effective photocatalysts developed in this work could be applied to the efficient decolorization of negatively charged organic dyes by employing solar energy.

Original languageEnglish
Article number423
JournalNanomaterials
Volume8
Issue number6
DOIs
Publication statusPublished - 2018 Jun 11

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Photocatalysts
Nanocrystals
Graphene
Oxides
Nanosheets
Solar energy
Coloring Agents
X ray photoelectron spectroscopy
Dyes
Crystal structure
Irradiation
Transmission electron microscopy
Adsorption
X ray diffraction
Atoms
Crystals
Scanning electron microscopy
Kinetics
Electrons

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Materials Science(all)

Cite this

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title = "Facet-dependent cuprous oxide nanocrystals decorated with graphene as durable photocatalysts under visible light",
abstract = "Three morphologies (octahedral, hierarchical and rhombic dodecahedral) of crystal Cu2O with different facets ({111}, {111}/{110}, and {110}) incorporating graphene sheets (denoted as o-Cu2O-G, h-Cu2O-G and r-Cu2O-G, respectively) have been fabricated by using simple solution-phase techniques. Among these photocatalysts, the r-Cu2O-G possesses the best photocatalytic performance of 98{\%} removal efficiency of methyl orange (MO) with outstanding kinetics for 120 min of visible light irradiation. This enhancement is mainly due to the dangling “Cu” atoms in the highly active {110} facets, resulting in the increased adsorption of negatively charged MO. More importantly, the unique interfacial structures of Cu2O rhombic dodecahedra connected to graphene nanosheets can not only decrease the recombination of electron-hole pairs but also stabilize the crystal structure of Cu2O, as verified by a series of spectroscopic analyses (e.g., X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM)). The effective photocatalysts developed in this work could be applied to the efficient decolorization of negatively charged organic dyes by employing solar energy.",
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Facet-dependent cuprous oxide nanocrystals decorated with graphene as durable photocatalysts under visible light. / Liu, Shou Heng; Lu, Jun Sheng.

In: Nanomaterials, Vol. 8, No. 6, 423, 11.06.2018.

Research output: Contribution to journalArticle

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