Synthesis of Cu2O/T-ZnOW nanocompound and characterization of its photocatalytic activity and stability property under UV irradiation

Liu, H.; Wang, J.; Fan, Xiaoxing; Zhang, F.Z.; Liu, H.R.; Dai, J. G.; Xiang, Fangming

doi:10.1016/j.mseb.2012.10.041

Cited by 13 publications

(6 citation statements)

References 46 publications

(79 reference statements)

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“…It can be observed from the Figure b that peaks at about 933.5 and 954.5 eV corresponded to binding energies of Cu 2p 3/2 and Cu 2p 1/2 , respectively. The peak at about 945 eV corresponded to the CuO satellite peak, which confirmed the presence of very trace amount of CuO Figure c shows the Zn 2p spectra, the peaks at 1021.5 and 1045.5 eV are corresponded to Zn 2p 3/2 and Zn 2p 1/2 , respectively.…”

Section: Resultsmentioning

confidence: 57%

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Zinc-Modified Copper Catalyst for Efficient (Photo-)Electrochemical CO₂ Reduction with High Selectivity of HCOOH Production

Ajmal

Yang

et al. 2019

J. Phys. Chem. C

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(Photo-)electrochemical carbon dioxide (CO2) reduction has gained significant importance as it has the potential to yield valuable organic products by utilizing renewable energy. Here, CuZn alloy catalysts fabricated by the electrodeposition method were evaluated as efficient catalysts for selective CO2 reduction to HCOOH. By varying the concentration of zinc (Zn) in CuZn bimetallic catalysts, the Faradaic efficiency and partial current density of HCOOH on CuZn-0.5 were enhanced nearly 4 and 5 times, respectively, as compared to Cu foil. Furthermore, we developed a photoelectrochemical cell system for CO2 reduction by using the CuZn-0.5 catalyst as the cathode and BiVO4 as the photoanode. HCOOH formation was maximized with approximately 60% Faradaic efficiency under simulated sunlight, which is among the highest for copper-based cathodes. The higher selectivity of CuZn originates from the synergistic effect of Cu and Zn. The reaction process is further studied by in situ Raman and density functional theory calculations. This work can provide a detailed understanding of developing a catalyst with highly selective HCOOH formation.

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Section: Resultsmentioning

confidence: 57%

“…The peak at about 945 eV corresponded to the CuO satellite peak, which confirmed the presence of very trace amount of CuO. 61 Figure 3c shows the Zn 2p spectra, the peaks at 1021.5 and 1045.5 eV are corresponded to Zn 2p 3/2 and Zn 2p 1/2 , respectively. Further, the peaks at 533 eV in Figure 3d can be attributed to surface oxygen.…”

Section: Resultsmentioning

confidence: 73%

Zinc-Modified Copper Catalyst for Efficient (Photo-)Electrochemical CO₂ Reduction with High Selectivity of HCOOH Production

Ajmal

Yang

et al. 2019

J. Phys. Chem. C

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“…In the asymmetric core-level spectrum, the peaks at 932.4 and 952.2 eV correspond to the binding [23] The appearance of weak and broad satellite peaks around 943.0 eV also confirms the coexistence of a trace amount of CuO, although it is not detected in the XRD measurements. [24] This can be ascribed to the relatively small amount and the amorphous nature of CuO that might be because of surface oxidization of Cu 2 O.…”

Section: Resultsmentioning

confidence: 99%

Cu₂O/Reduced Graphene Oxide Composites for the Photocatalytic Conversion of CO₂

2014

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A facile one-step microwave-assisted chemical method has been successfully used for the synthesis of Cu2O/reduced graphene oxide (RGO) composites. Photocatalytic CO2 reduction was then investigated on the junction under ambient conditions. The RGO coating dramatically increases Cu2O activity for CO2 photoreduction to result in a nearly six times higher activity than the optimized Cu2O and 50 times higher activity than the Cu2O/RuOx junction in the 20th hour. Furthermore, an apparent initial quantum yield of approximately 0.34 % at 400 nm has been achieved by the Cu2O/RGO junction for CO2 photoreduction. The photocurrent of the junction is nearly double that of the blank Cu2O photocathode. The improved activity together with the enhanced stability of Cu2O is attributed to the efficient charge separation and transfer to RGO as well as the protection function of RGO, which was proved by XRD, SEM, TEM, X-ray photoelectron spectroscopy, photo-electrochemical, photoluminescence, and impedance characterizations. This study further presents useful information for other photocatalyst modification for efficient CO2 reduction without the need for a noble-metal co-catalyst.

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“…The main peak at 932.4 eV and 952.1 eV is known as the characteristic peak of Cu + , whereas the shake-up satellite peaks are on the higher binding energy side. [44][45][46] The shake-up satellite peaks indicate the presence of an unfilled Cu 3d orbit, which demonstrated the existence of Cu 2+ on the sample. This phenomenon was probably due to a small portion of Cu 2 O that might be oxidized to CuO under normal ambient conditions.…”

Section: Xps Analysismentioning

confidence: 97%

Excellent visible-light-driven photocatalytic performance of Cu₂O sensitized NaNbO₃heterostructures

Fan

et al. 2015

New J. Chem.

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The photocatalytic activity of Cu 2 O/NaNbO 3 (CNO) heterostructure was firstly reported in this work. Pure NaNbO 3 photocatalyst was synthesized via a facile hydrothermal reaction using Nb 2 O 5 and NaOH as a precursors. Series of Cu 2 O nanoparticles modified NaNbO 3 were prepared via chemical reduction of Cu salt. The composition and morphology of prepared CNO samples were characterized by variety of analytical methods. The results showed that Cu 2 O nanoparticles were well distributed on the surface of cube NaNbO 3 micro-structure. The photocatalytic performance of prepared samples was evaluated by degradation of methyl orange (MO) under the visible light irradiation. The effect of MO degradation revealed that Cu 2 O nanoparticles could act as sensitizers for improving visible light absorption of NaNbO 3 cube. We proposed the heterostructure between Cu 2 O and NaNbO 3 , by which the recombination of electrons and holes was efficiently inhibited as well as an enhanced photocatalytic activity.Fig. 3. TEM image (a and b); HRTEM (c); Inset: SAED image. EDX (d) of 8% CNO photocatalysts sample.Fig. 4. a: UV-vis diffuse reflectance spectra of X % CNO photocatalysts with various X: (a) X = 0; (b) X = 4; (c) X = 6; (d) X = 8; (e) X =10; (f) X =15; (g) Cu 2 O; b and c : the Kubelka-Munk function plot of NaNbO 3 and Cu 2 O.Fig. 5. XPS survey spectrum of CNO photocatalyst (a); High resolution Cu 2p spectrum (b); High resolution Nb 3d spectrum (c); High resolution O 1s spectrum (d).Fig. 6. Adsorption equilibrium (A) and Photocatalytic degradation (B) of MO using X % CNO photocatalysts with various X: (a) X = 0; (b) X = 4; (c) X = 6; (d) X = 8; (e) X =10; (f) X =15; (g) Cu 2 O and NaNbO 3 mechanical mixture with the Cu content of 8 %; (h) Cu 2 O.Fig. 9. Schematic illustration of the charge transfer in CNO composites.Fig.10 (a): Photoluminescence emission spectra of X % CNO photocatalysts with various X: (a) X = 0; (b) X = 4; (c) X = 6; (d) X = 8; (e) X =10; (f) X =15. (b): Photocurrent versus time (I-t) curves of the pure NaNbO 3 and 8 % CNO samples.

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Synthesis of Cu2O/T-ZnOW nanocompound and characterization of its photocatalytic activity and stability property under UV irradiation

Cited by 13 publications

References 46 publications

Zinc-Modified Copper Catalyst for Efficient (Photo-)Electrochemical CO₂ Reduction with High Selectivity of HCOOH Production

Zinc-Modified Copper Catalyst for Efficient (Photo-)Electrochemical CO₂ Reduction with High Selectivity of HCOOH Production

Cu₂O/Reduced Graphene Oxide Composites for the Photocatalytic Conversion of CO₂

Excellent visible-light-driven photocatalytic performance of Cu₂O sensitized NaNbO₃heterostructures

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Synthesis of Cu2O/T-ZnOW nanocompound and characterization of its photocatalytic activity and stability property under UV irradiation

Cited by 13 publications

References 46 publications

Zinc-Modified Copper Catalyst for Efficient (Photo-)Electrochemical CO2 Reduction with High Selectivity of HCOOH Production

Zinc-Modified Copper Catalyst for Efficient (Photo-)Electrochemical CO2 Reduction with High Selectivity of HCOOH Production

Cu2O/Reduced Graphene Oxide Composites for the Photocatalytic Conversion of CO2

Excellent visible-light-driven photocatalytic performance of Cu2O sensitized NaNbO3heterostructures

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Zinc-Modified Copper Catalyst for Efficient (Photo-)Electrochemical CO₂ Reduction with High Selectivity of HCOOH Production

Zinc-Modified Copper Catalyst for Efficient (Photo-)Electrochemical CO₂ Reduction with High Selectivity of HCOOH Production

Cu₂O/Reduced Graphene Oxide Composites for the Photocatalytic Conversion of CO₂

Excellent visible-light-driven photocatalytic performance of Cu₂O sensitized NaNbO₃heterostructures