Effect of annealing process on the heterostructure CuO/Cu 2 O as a highly efficient photocathode for photoelectrochemical water reduction

Du, Fuxin; Chen, Qing‐Yun; Wang, Yun‐Hai

doi:10.1016/j.jpcs.2016.12.029

Cited by 51 publications

(28 citation statements)

References 29 publications

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“…As shown in Figure e, the Cu 2p core‐level spectrum exhibited two main peaks, 2p3/2 at 932.6 eV and 2p1/2 at 952.3 eV, suggesting the characteristic +1 oxidation state. Two additional peaks with higher binding energies at 934.6 and 954.5 eV can be ascribed to a higher valence state, i.e., Cu 2+ . Notably, the Cu 2+ 2p3/2 and 2p1/2 peaks observed for BiVO 4 {010}–Au–Cu 2 O are obviously weaker than those of BiVO 4 {110}–Au–Cu 2 O and especially BiVO 4 {010}–Cu 2 O, implying that the self‐oxidization of Cu + to Cu 2+ was effectively suppressed in BiVO 4 {010}–Au–Cu 2 O during the photoreduction process.…”

Section: Resultsmentioning

confidence: 99%

A Facet‐Dependent Schottky‐Junction Electron Shuttle in a BiVO₄{010}–Au–Cu₂O Z‐Scheme Photocatalyst for Efficient Charge Separation

Zhou

Wang

Zhao

et al. 2018

Adv Funct Materials

209

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Interfacial charge separation and transfer are the main challenges of efficient semiconductor-based Z-scheme photocatalytic systems. Here, it is discovered that a Schottky junction at the interface between the BiVO 4 {010} facet and Au is an efficient electron-transfer route useful for constructing a high-performance BiVO 4 {010}-Au-Cu 2 O Z-scheme photocatalyst. Spectroscopic and computational studies reveal that hot electrons in BiVO 4 {010} more easily cross the Schottky barrier to expedite the migration from BiVO 4 {010} to Au and are subsequently captured by the excited holes in Cu 2 O. This crystal-facet-dependent electron shuttle allows the long-lived holes and electrons to stay in the valence band of BiVO 4 and conduction band of Cu 2 O, respectively, contributing to improved light-driven CO 2 reduction. This unique semiconductor crystal-facet sandwich structure will provide an innovative strategy for rational design of advanced Z-scheme photocatalysts.

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Section: Resultsmentioning

confidence: 99%

A Facet‐Dependent Schottky‐Junction Electron Shuttle in a BiVO₄{010}–Au–Cu₂O Z‐Scheme Photocatalyst for Efficient Charge Separation

Zhou

Wang

Zhao

et al. 2018

Adv Funct Materials

209

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“…The shake-up satellites are at around 944.1 eV with the shake-up satellites for the CuONPs are at 941.2 and 943.7 eV. 55−58…”

Section: Resultsmentioning

confidence: 91%

Continuous Flow Copper Laser Ablation Synthesis of Copper(I and II) Oxide Nanoparticles in Water

et al. 2019

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Copper(I) oxide (Cu 2 O) nanoparticles (NPs) are selectively prepared in high yields under continuous flow in a vortex fluidic device (VFD), involving irradiation of a copper rod using a pulsed laser operating at 1064 nm and 600 mJ. The plasma plume generated inside a glass tube (20 mm O.D.), which is rapidly rotating (7.5 k rpm), reacts with the enclosed air in the microfluidic platform, with then high mass transfer of material into the dynamic thin film of water passing up the tube. The average size of the generated Cu 2 ONPs is 14 nm, and they are converted to copper(II) oxide (CuO) nanoparticles with an average diameter of 11 nm by heating the as-prepared solution of Cu 2 ONPs in air at 50 °C for 10 h.

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“…The smaller peak at 932.9 eV should correspond to Cu 2p 3/2 for Cu + ions. This indicates that Cu 2+ and Cu + ions coexist in 0.04Nb/0.02Al-CuO ceramics [27]. The high resolution XPS spectrum of Nb 3d is shown in Fig.…”

Section: Phase and Microstructurementioning

confidence: 83%

Electrical properties of Nb/Al-doped CuO-based ceramics for NTC thermistors

Wang

Yan

et al. 2020

PAC

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Nb/Al-modified CuO ceramics (yNb/0.02Al-CuO, 0 ≤ y ≤ 0.07, denoted as NACO) were synthesized using sol-gel method for applications in negative temperature coefficient (NTC) thermistors. The phase structure, microstructure and electrical properties of the ceramics were investigated. XRD investigation reveals that the NACO ceramics has the main phase with monoclinic crystalline structure. The analysis of X-ray photoelectron spectroscopy proved the existence of Cu 2+ /Cu + and Nb 5+ /Nb 4+ ions. Temperature dependence of the resistivity indicated that the NACO ceramics present typical NTC characteristic. The NTC materials' constant, B value, can be adjusted from 2430 K to 3805 K by changing the Nb-concentration in the Al-doped CuO ceramics. Among four applied calibration equations the Hoge-3 equation is the most effective one for the resistancetemperature calibration of the prepared NTC thermistors. The complex impedance analysis was performed and revealed that both grain effect and grain boundary effect similarly contribute to the electrical conductive behaviour and NTC feature of the NACO ceramics. The band conduction and polaron hopping conduction are proposed as the conduction mechanisms in the NACO thermistors.

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Effect of annealing process on the heterostructure CuO/Cu 2 O as a highly efficient photocathode for photoelectrochemical water reduction

Cited by 51 publications

References 29 publications

A Facet‐Dependent Schottky‐Junction Electron Shuttle in a BiVO₄{010}–Au–Cu₂O Z‐Scheme Photocatalyst for Efficient Charge Separation

A Facet‐Dependent Schottky‐Junction Electron Shuttle in a BiVO₄{010}–Au–Cu₂O Z‐Scheme Photocatalyst for Efficient Charge Separation

Continuous Flow Copper Laser Ablation Synthesis of Copper(I and II) Oxide Nanoparticles in Water

Electrical properties of Nb/Al-doped CuO-based ceramics for NTC thermistors

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Effect of annealing process on the heterostructure CuO/Cu 2 O as a highly efficient photocathode for photoelectrochemical water reduction

Cited by 51 publications

References 29 publications

A Facet‐Dependent Schottky‐Junction Electron Shuttle in a BiVO4{010}–Au–Cu2O Z‐Scheme Photocatalyst for Efficient Charge Separation

A Facet‐Dependent Schottky‐Junction Electron Shuttle in a BiVO4{010}–Au–Cu2O Z‐Scheme Photocatalyst for Efficient Charge Separation

Continuous Flow Copper Laser Ablation Synthesis of Copper(I and II) Oxide Nanoparticles in Water

Electrical properties of Nb/Al-doped CuO-based ceramics for NTC thermistors

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A Facet‐Dependent Schottky‐Junction Electron Shuttle in a BiVO₄{010}–Au–Cu₂O Z‐Scheme Photocatalyst for Efficient Charge Separation

A Facet‐Dependent Schottky‐Junction Electron Shuttle in a BiVO₄{010}–Au–Cu₂O Z‐Scheme Photocatalyst for Efficient Charge Separation