Preparation and characterization of Cu modified BiYO3 for carbon dioxide reduction to formic acid

Su, Tongming; Tian, Hui; Qin, Zuzeng; Ji, Hongbing

doi:10.1016/j.apcatb.2016.09.035

Cited by 76 publications

(32 citation statements)

References 65 publications

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“…Therefore, it is a useful method to understand the fate of electron–hole pairs in semiconductors by measuring their PL emission intensity. In general, a lower emission intensity indicates higher separation efficiency of electron–hole pairs in the semiconductor photocatalysts. The PL emission spectra of Nb 2 CT x , oxidized Nb 2 CT x , and Mix‐NN with excitation at λ =325 nm at room temperature are displayed in Figure B.…”

Section: Resultsmentioning

confidence: 99%

“…Electrochemical impedance spectroscopy (EIS) was performed to elucidate the charge‐transfer resistance in the photocatalyst. In particular, a smaller radius of the arc in the spectra indicates a smaller electron‐transfer resistance on the surface of the photoelectrodes, which normally leads to more effective separation of the photoelectron–hole pairs and faster interfacial charge transfer . As shown in Figure A, the arc radius of the EIS Nyquist plots of NCN‐1.0 is clearly smaller than that of Nb 2 CT x , probably as a result of substantial removal of the functional groups and intercalated water molecules during the oxidation process at high temperature .…”

Section: Resultsmentioning

confidence: 99%

“…In particular,asmallerr adius of the arc in the spectra indicates asmaller electron-transfer resistance on the surface of the photoelectrodes, which normally leads to more effective separation of the photoelectron-holep airs and faster interfacial charge transfer. [44,53] As shown in Figure 8A,t he arc radius of the EIS Nyquistp lotso fN CN-1.0 is clearly smaller than that of Nb 2 CT x ,p robablya sar esult of substantial removal of the functional groups and intercalated water molecules duringt he oxidation process at high temperature. [34] The EIS Nyquist plots can be simulated to the equivalent electrical circuit shown in Figure 8A (inset), in which R s and R t are the electrolyte solution resistance and the interfacial charge-transfer resistance/electrolyte, respectively,a nd CPE is the constant phase element.…”

Section: Chargeseparation and Transfermentioning

confidence: 95%

“…[12] Photoluminescence( PL) emissions originate from the radiative recombination of photogeneratede lectron-hole pairs. Therefore, it is au seful methodt ou nderstand the fate of electron-hole pairs in semiconductors by measuring their PL emis-sion intensity.I ng eneral,alower emission intensity indicates higher separation efficiency of electron-hole pairs [44] in the semiconductor photocatalysts. The PL emission spectra of Nb 2 CT x ,o xidized Nb 2 CT x ,a nd Mix-NNw ith excitation at l = 325 nm at room temperature are displayed in Figure 5B.T he emission band intensity of the NCN-0.5 and NCN-1.0 samples is decreased relative to that of Nb 2 O 5 ,w hich suggests that NCN-0.5 and NCN-1.0 have lower recombination rates of photogenerated chargec arriers.…”

Section: Light-harvesting Capability and Photoluminescence Spectra Anmentioning

confidence: 99%

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One‐Step Synthesis of Nb₂O₅/C/Nb₂C (MXene) Composites and Their Use as Photocatalysts for Hydrogen Evolution

et al. 2018

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Hydrogen production through facile photocatalytic water splitting is regarded as a promising strategy to solve global energy problems. Transition-metal carbides (MXenes) have recently drawn attention as potential co-catalyst candidates for photocatalysts. Here, we report niobium pentoxide/carbon/niobium carbide (MXene) hybrid materials (Nb O /C/Nb C) as photocatalysts for hydrogen evolution from water splitting. The Nb O /C/Nb C composites were synthesized by one-step CO oxidation of Nb CT . Nb O grew homogeneously on Nb C after mild oxidation, during which some amorphous carbon was also formed. With an optimized oxidation time of 1.0 h, Nb O /C/Nb C showed the highest hydrogen generation rate (7.81 μmol h g ), a value that was four times higher than that of pure Nb O . The enhanced performance of Nb O /C/Nb C was attributed to intimate contact between Nb O and conductive Nb C and the separation of photogenerated charge carriers at the Nb O /Nb C interface; the results presented herein show that transition-metal carbide are promising co-catalysts for photocatalytic hydrogen production.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Chargeseparation and Transfermentioning

confidence: 95%

Section: Light-harvesting Capability and Photoluminescence Spectra Anmentioning

confidence: 99%

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One‐Step Synthesis of Nb₂O₅/C/Nb₂C (MXene) Composites and Their Use as Photocatalysts for Hydrogen Evolution

et al. 2018

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“…Light absorption capability was significantly improved by adding Ag. And the band gap of Ag_ZnO-SS estimated by Tauc Plot using Kubelka-Munk method [35,36] in Fig. S3b was 3.26 eV, slightly smaller than ZnO-SS (3.30 eV).…”

Section: Crystal Structure Morphology and Optical Property Of Zno-ssmentioning

confidence: 99%

Atomic layer deposited TiO2 ultrathin layer on Ag_ZnO nanorods for stable and efficient photocatalytic degradation of RhB

Zhao

Deng

2017

Adv Compos Hybrid Mater

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Highly stable and active TiO 2 -coated Ag-modified ZnO nanorods supported on stainless steel mesh (xTi@Ag_ZnO-SS) were successfully synthesized in this work. A low-temperature one-pot hydrothermal method was used to grow Ag_ZnO on stainless steel mesh, and subsequently, an atomic layer deposition (ALD) technique was applied to deposit a TiO 2 layer on the surface of Ag_ZnO-SS. The addition of Ag-enhanced photoactivity via favored charge carrier transfer and the TiO 2 layer improved stability through suppressed corrosion under UV irradiation, which was demonstrated by cycling performance for RhB photodegradation in two aspects: morphology and photoactivity. After 10 cycles (2 h/cycle) RhB degradation tests under UV irradiation, all the TiO 2 -protected ZnO materials maintained more intact nanorods structure and more than 80% of the initial photoactivity in the 1st cycle, whereas the ZnO materials without TiO 2 coating were drastically deconstructed and only had 56% of initial photodegradation ability. Comprehensive study indicated that thicker TiO 2 layers resulted in higher stability but lower photoactivity due to the inhibited charge transfer. The developed TiO 2 @Ag_ZnO nanorods immobilized on stainless steel mesh demonstrated a promising strategy for the design of highly stable and active photocatalysts endowed with great industrial scalability and practicality.

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Oxygen Vacant Semiconductor Photocatalysts

Lin

Huang

2021

Adv Funct Materials

324

143

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Semiconductor photocatalysis acts as a sustainable green technology to convert solar energy for environmental purification and production of renewable energy. However, the current photocatalysts suffer from inefficient photoabsorption, rapid recombination of photogenerated electrons and holes, and inadequate surface reactive sites. Introduction of oxygen vacancies (OVs) in photocatalysts has been demonstrated to be an efficacious strategy to solve these issues and improve photocatalytic efficiency. This review systematically summarizes the recent progress in the oxygen vacant semiconductor photocatalysts. Firstly, the formation and characterizations of OVs in semiconductor photocatalysts are briefly introduced. Then, highlighted are the roles of OVs in the photocatalytic reactions of three types of typical oxygencontaining semiconductors, including metal oxides (TiO 2 , ZnO, WO 3 , W 18 O 49 , MoO 3 , BiO 2-x , SnO 2 , etc), hydroxides (In(OH) 3 , Ln(OH) 3 (Ln=La, Pr, and Nd), Layered double hydroxides) and oxysalts (bismuth-based oxysalts and others) photocatalysts. Moreover, the advanced photocatalytic applications of oxygen vacant semiconductor photocatalysts, such as pollutant removal, H 2 production, CO 2 reduction, N 2 fixation and organic synthesis are systematically summarized. Finally, an overview on the current challenges and a prospective on the future of oxygen vacant materials is proposed.

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Preparation and characterization of Cu modified BiYO3 for carbon dioxide reduction to formic acid

Cited by 76 publications

References 65 publications

One‐Step Synthesis of Nb₂O₅/C/Nb₂C (MXene) Composites and Their Use as Photocatalysts for Hydrogen Evolution

One‐Step Synthesis of Nb₂O₅/C/Nb₂C (MXene) Composites and Their Use as Photocatalysts for Hydrogen Evolution

Atomic layer deposited TiO2 ultrathin layer on Ag_ZnO nanorods for stable and efficient photocatalytic degradation of RhB

Oxygen Vacant Semiconductor Photocatalysts

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Preparation and characterization of Cu modified BiYO3 for carbon dioxide reduction to formic acid

Cited by 76 publications

References 65 publications

One‐Step Synthesis of Nb2O5/C/Nb2C (MXene) Composites and Their Use as Photocatalysts for Hydrogen Evolution

One‐Step Synthesis of Nb2O5/C/Nb2C (MXene) Composites and Their Use as Photocatalysts for Hydrogen Evolution

Atomic layer deposited TiO2 ultrathin layer on Ag_ZnO nanorods for stable and efficient photocatalytic degradation of RhB

Oxygen Vacant Semiconductor Photocatalysts

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Product

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One‐Step Synthesis of Nb₂O₅/C/Nb₂C (MXene) Composites and Their Use as Photocatalysts for Hydrogen Evolution

One‐Step Synthesis of Nb₂O₅/C/Nb₂C (MXene) Composites and Their Use as Photocatalysts for Hydrogen Evolution