High Efficient Photocatalytic Degradation of p-Nitrophenol on a Unique Cu<sub>2</sub>O/TiO<sub>2</sub> p-n Heterojunction Network Catalyst

Yang, Lixia; Luo, Shenglian; Li, Yue; Yan, Xiao; Kang, Qing; Cai, Qingyun

doi:10.1021/es101711k

Cited by 464 publications

(200 citation statements)

References 20 publications

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“…When further functionalized with plasmonic Au or Ag nanoparticles, the optimal photocatalyst exhibited ≈16‐fold improvement for the photocatalytic reduction of CO 2 to CH 4 compared to pure ZnIn 2 S 4 . N‐type TiO 2 can also be coupled with p‐type semiconductors such as CuO or Cu 2 O to form type II p−n hereojunctions 189, 190, 191, 192. Schaak and co‐workers synthesized a CuO‐TiO 2− x N x p–n junction though the reactive template method 193.…”

Section: Photocatalytic Materials For Co2 Reductionmentioning

confidence: 99%

CO₂ Reduction: From the Electrochemical to Photochemical Approach

et al. 2017

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Increasing CO2 concentration in the atmosphere is believed to have a profound impact on the global climate. To reverse the impact would necessitate not only curbing the reliance on fossil fuels but also developing effective strategies capture and utilize CO2 from the atmosphere. Among several available strategies, CO2 reduction via the electrochemical or photochemical approach is particularly attractive since the required energy input can be potentially supplied from renewable sources such as solar energy. In this Review, an overview on these two different but inherently connected approaches is provided and recent progress on the development, engineering, and understanding of CO2 reduction electrocatalysts and photocatalysts is summarized. First, the basic principles that govern electrocatalytic or photocatalytic CO2 reduction and their important performance metrics are discussed. Then, a detailed discussion on different CO2 reduction electrocatalysts and photocatalysts as well as their generally designing strategies is provided. At the end of this Review, perspectives on the opportunities and possible directions for future development of this field are presented.

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Section: Photocatalytic Materials For Co2 Reductionmentioning

confidence: 99%

CO₂ Reduction: From the Electrochemical to Photochemical Approach

et al. 2017

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“…This fundamental parameter largely reflects electron activities and is directly related to chemical, physical, and mechanical properties of materials [2][3][4][5][6][7][8]. Recent studies have shown that EWF can be used as a sensitive parameter to characterize many surface properties of biomaterials.…”

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confidence: 99%

Electron Work Function–An Effective Parameter for In-situ Reflection of Electron Activities in Various Processes

Li¹

2013

J Biosens Bioelectron

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Electron work function (EWF) is the minimum energy required to move electrons at the Fermi level from inside a conducting material to its surface with zero kinetic energy [1,2]. This fundamental parameter largely reflects electron activities and is directly related to chemical, physical, and mechanical properties of materials [2][3][4][5][6][7][8]. Recent studies have shown that EWF can be used as a sensitive parameter to characterize many surface properties of biomaterials. As an example [9], the affinity of medical implant materials for bacteria can be characterized by EWF. Figure 1A illustrates the adhesive forces of nanocrystalline stainless steel samples with different gran sizes. As shown, as the grain size decreases, the adhesion decreases due to the fact that the passive film becomes more protective, blocking the interaction between the steel and surrounding media. Such a trend is consistent with the variations in electron work function, as shown in Figure 1B. A higher surface EWF corresponds to a higher degree of reluctance for interacting with the environment. The decrease in the number of bacteria bound to the surfaces with an increase in EWF provides direct evidence.Another example is the use of EWF in analyzing the photocatalyical activity of TiO2 nanotubes (TNTs). TNTs have been used for different applications such as DNA biosensor [10], detection of bacteria [11] and toxic compounds [12]. TNTs have also been explored for immobilizing proteins and enzymes in biomaterial and biosensor applications [13,14]. Many of the application are related to the photocatalytic activity of TNTs, which is usually evaluated by variations in photocurrent and absorbance under illumination. However, the photocurrent response or absorbance does not provide sufficient information for full understanding of the photocatalytic behaviour of TNAs.Recent studies have demonstrated that the electron work function is a very sensitive parameter for in-situ analysis of photocatalytic activity of TNTs [15]. Figure 2 illustrates variations in the work function of TiO 2 nanotubes with different tube lengths (corresponding to the anodization duration; the larger the anodization duration, the longer the nanotubes). Figures 2A, C, E and G illustrate variations in EWF of the TNAs illuminated successively by lights having wavelengths of 670 nm, 650 nm, 550 nm, 450 nm, 420 nm, 400 nm and 390 nm. As shown, EWF of the TNAs was relatively stable when they were illuminated by lights of 670 nm and 620 nm, indicating that the photonic energies of the lights are not sufficient to excite electrons in the TNAs. While when the wavelength of incident light is in the absorption range of TNAs lower than 550 nm, electrons can be excited accompanied with an apparent decrease in EWF. The observed decrease in EWF with a decrease in the wavelength of incident light is an indication of photoninduced electron-hole separation, which requires photons with their energy above a certain level.The TNAs were also illuminated successively by the lights with different ...

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“…Similarly, Lixia Yang and co-workers studied high e±cient photocatalytic degradation of p-nitrophenol on a unique Cu 2 O/TiO 2 p-n heterojunction network catalyst. 33 …”

Section: Introductionmentioning

confidence: 99%

Enhanced Photocatalytic Activity by Cu₂O Nanoparticles Integrated H₂Ti₃O₇ Nanotubes for Removal of Mercaptan

Guo

et al. 2017

NANO

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The Cu 2 O@H 2 Ti 3 O 7 nanocomposite was prepared through a facile hydrothermal method. The as-prepared samples were investigated by powder X-ray di®raction (XRD), high resolution transmission electron microscopy (HRTEM), laser Raman spectroscopy (LRS), N 2 adsorptiondesorption measurements and UV-Vis di®use re°ection spectroscopy (UV-Vis-DRS). The photocatalytic performance of the as-prepared Cu 2 O@H 2 Ti 3 O 7 nanocomposite is evaluated by the oxidation of ethyl mercaptan (EM) under sunlight irradiation. The results indicate that the Cu 2 O nanoparticles are integrated uniformly on H 2 Ti 3 O 7 nanotubes, and the absorption edge of the nanocomposite has obviously shifted to visible light region compared to H 2 Ti 3 O 7 nanotubes. There is an obvious synergistic e®ect existing between the dispersed Cu 2 O nanoparticles and H 2 Ti 3 O 7 nanotubes, and the Cu 2 O@H 2 Ti 3 O 7 composite shows stronger visible spectral response and wider absorbance. Then, an enchanced photodegradation activity is obtained for the removal of EM under sunlight irradiation compared to its precursors.

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High Efficient Photocatalytic Degradation of p-Nitrophenol on a Unique Cu₂O/TiO₂ p-n Heterojunction Network Catalyst

Cited by 464 publications

References 20 publications

CO₂ Reduction: From the Electrochemical to Photochemical Approach

CO₂ Reduction: From the Electrochemical to Photochemical Approach

Electron Work Function–An Effective Parameter for In-situ Reflection of Electron Activities in Various Processes

Enhanced Photocatalytic Activity by Cu₂O Nanoparticles Integrated H₂Ti₃O₇ Nanotubes for Removal of Mercaptan

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High Efficient Photocatalytic Degradation of p-Nitrophenol on a Unique Cu2O/TiO2 p-n Heterojunction Network Catalyst

Cited by 464 publications

References 20 publications

CO2 Reduction: From the Electrochemical to Photochemical Approach

CO2 Reduction: From the Electrochemical to Photochemical Approach

Electron Work Function–An Effective Parameter for In-situ Reflection of Electron Activities in Various Processes

Enhanced Photocatalytic Activity by Cu2O Nanoparticles Integrated H2Ti3O7 Nanotubes for Removal of Mercaptan

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Product

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High Efficient Photocatalytic Degradation of p-Nitrophenol on a Unique Cu₂O/TiO₂ p-n Heterojunction Network Catalyst

CO₂ Reduction: From the Electrochemical to Photochemical Approach

CO₂ Reduction: From the Electrochemical to Photochemical Approach

Enhanced Photocatalytic Activity by Cu₂O Nanoparticles Integrated H₂Ti₃O₇ Nanotubes for Removal of Mercaptan