Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 181, Issue -, Pages 495-503Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2015.08.017
Keywords
Crystal-plane effect; Cu2O-rGO; Visible-light degradation; Superoxide radical; Interfacial interaction
Funding
- Natural Science Foundation of Jiangsu Province [BK2012298]
- National Natural Science Foundation of China [21273110, 21203091]
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In this work, Cu2O-reduced graphene oxide (rGO) composites were synthesized with tunable Cu2O crystal facets ({111}, { 110} and {100} facets). The degradation performance of methylene blue under visible light was ranked: o-Cu2O{111}-rGO > d-Cu2O{110}-rGO >c-Cu2O{100}-rGO. UV-vis diffuse reflectance and photoluminescence spectra showed that 0-Cu2O-rGO exhibited the enhanced visible-light absorption and the faster charge-transfer rate. Furthermore, X-ray photoelectron spectroscopy and Raman characterizations showed that o-Cu2O-rGO was beneficial for the stabilization of Cu+ species and the formation of oxygen defects. With the help of in-situ electron spin resonance (ESR), more superoxide radicals were detected over o-Cu2O-rGO, which promoted organic pollutants degradation. The above results confirmed that the catalytic behaviors of three Cu2O-rGO composites were related to the electronic structures and interfacial connections. The o-Cu2O{111}-rGO displayed the superior performance, for the highly-active coordinated unsaturated Cu and the intensive interfacial connection, which was beneficial for the rapid the photo-generated electron transfer and the formed active superoxide species. This study showed that engineering the interfacial structures could provide a scientific basis for the design of efficient photo-catalysts. (C) 2015 Elsevier B.V. All rights reserved.
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