Induced C C coupling in CO2 photocatalytic reduction via carbothermally reduced nonstoichiometric tungsten oxide

Li, Tong; Xiao, Dong; Chen, Wei; Zhao, Xiaoju; Li, Guihua; Feng, Guanghui; Song, Yuxin; Wei, Wei; Sun, Yuhan

doi:10.1016/j.apsusc.2020.146578

Cited by 13 publications

(8 citation statements)

References 42 publications

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“…The main peaks at 35.62 and 37.71 eV were noticed, which were attributed to W 6+ . The double peaks centered at 34.65 and 36.75 eV corresponded to the W 5+ state . A left shift of the W–O bond for Cu–W–TiO 2 was observed in the extended X-ray absorption fine structure (EXAFS) spectra (Figure e) compared with W–TiO 2 .…”

Section: Resultsmentioning

confidence: 92%

“…The double peaks centered at 34.65 and 36.75 eV corresponded to the W 5+ state. 30 A left shift of the W−O bond for Cu−W− TiO 2 was observed in the extended X-ray absorption fine structure (EXAFS) spectra (Figure 2e) compared with W− TiO 2 . This phenomenon indicated that the W−O bond length of Cu−W−TiO 2 was shorter than that of W−TiO 2 , and the bonding energy was also strengthened after Cu and W codoping.…”

Section: ■ Results and Discussionmentioning

confidence: 96%

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Selective Photocatalytic Oxidation of Methane to Oxygenates over Cu–W–TiO₂ with Significant Carrier Traps

Huang

Zhang

et al. 2022

ACS Catal.

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Direct selective methane photooxidation to liquid oxygenates with high productivity and selectivity under mild reaction conditions is highly urgent but remains challenging. Herein, a Cu and W codoped TiO2 (Cu–W–TiO2) photocatalyst was fabricated to enable aerobic oxidation of methane into oxygenates with limited formation of CO2 under ambient temperature. A high oxygenate productivity of 34.5 mmol g–1 with a remarkable selectivity of 97.1% was achieved over the Cu–W–TiO2 photocatalyst. Based on structural characterizations and mechanism studies, it was suggested that the Cu species acted as hole traps, while oxygen vacancies and the W6+-dopant state worked as electron traps. The inhibited recombination of photogenerated carriers contributed to enhanced photocatalytic efficiency. The modulated electronic and band structure promoted the activation of methane and hindered the overoxidation of oxygenates.

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Section: Resultsmentioning

confidence: 92%

Section: ■ Results and Discussionmentioning

confidence: 96%

Selective Photocatalytic Oxidation of Methane to Oxygenates over Cu–W–TiO₂ with Significant Carrier Traps

Huang

Zhang

et al. 2022

ACS Catal.

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“…The holes are consumed by H 2 O to produce O 2 , which was measured using a Clark-type oxygen electrode of dissolved oxygen analyzer. Accordingly, the stoichiometric overall reaction (4CO 2 + 4H 2 O → 2CH 3 CHO + 5O 2 ) has been confirmed 44.…”

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confidence: 76%

“…(e) EIS Nyquist plots of WO 3 -raw and WO 3 -T. (f) Proposed mechanisms for the conversion of CO 2 into CO and aldehyde over WO 3 -T catalysts. Reprinted with permission from ref . Copyright 2020 Elsevier.…”

Section: The Design Of Photocatalysts For Improving the Efficiency An...mentioning

confidence: 99%

“…43 Besides, Li et al prepared nonstoichiometric tungsten oxide by carbon thermal reduction of commercial tungsten oxide, introducing W 5+ species on the surface. 44 The nonstoichiometric WO 3 prepared under different carbon thermal reduction temperature (denoted as WO 3 -T) showed varied micromorphology and electronic structure. The morphology gradually transformed from nanomicrospheres to prismatic nanorods with increasing carbon thermal reduction temperature.…”

Section: Surface Plasmon Resonance Effectmentioning

confidence: 99%

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Advances in Modulating the Activity and Selectivity of Photocatalytic CO₂ Reduction to Multicarbon Products

Liao

Xie

et al. 2023

J. Phys. Chem. C

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The emission of carbon dioxide (CO2) induced by the widespread use of fossil fuels has caused global warming and climate issues. Photocatalytic CO2 reduction technology, which utilizes solar energy to convert CO2 into carbon-based fuels, provides a promising sustainable green way to ameliorate the energy crisis and reduce CO2 concentration in the atmosphere. Multicarbon products (C2+) with higher energy density and larger market value attract widespread research interests. This review is focused on the recent progress of photocatalytic reduction of CO2 to C2+ products. Starting from the discussion on the fundamental mechanism of photocatalytic CO2 conversion to C2+ products, the strategies of photocatalyst design for C2+ fuels synthesis from CO2 are summarized. Particularly, the photocatalyst optimization approaches for improving the activity and especially selectivity of CO2 reduction reaction (CRR) to access C2+ products are highlighted. Finally, some personal outlook on this research direction of photocatalytic CRR to C2+ products is presented. This review is expected to evoke more research attention on the value-added C2+ fuels synthesis from solar energy powered CRR.

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Investigating the Effect of the Initial Valence States of Copper on CO₂ Electroreduction

Dong

Chen

et al. 2021

ChemElectroChem

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The valence states of copper always play an important role for the most studied copper‐based catalysts in CO2 electroreduction (CO2ERR). In this work, distinct Cu, Cu2O, and CuO nanoparticles with similar particle size on active carbon are synthesized via carbonthermal reduction. Although all CuOx nanoparticles are reduced to metallic Cu during CO2ERR, their different initial valence states result in particle‐size variations and different CO2ERR performances. Cu nanoparticles in Cu/C evolve into smaller particles, while those derived from Cu2O/C and CuO/C agglomerate into larger ones. The optimal CO production potential of CO drops with decreasing particle size and is as low as −0.7 V (vs. the eversible hydrogen electrode) on Cu/C. Furthermore, Cu nanoparticles in Cu/C expose much more active sites with higher electrochemical active area and stronger CO adsorption, which further promote C−C coupling to produce C2+ products while inhibiting competitive hydrogen evolution.

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Induced C C coupling in CO2 photocatalytic reduction via carbothermally reduced nonstoichiometric tungsten oxide

Cited by 13 publications

References 42 publications

Selective Photocatalytic Oxidation of Methane to Oxygenates over Cu–W–TiO₂ with Significant Carrier Traps

Selective Photocatalytic Oxidation of Methane to Oxygenates over Cu–W–TiO₂ with Significant Carrier Traps

Advances in Modulating the Activity and Selectivity of Photocatalytic CO₂ Reduction to Multicarbon Products

Investigating the Effect of the Initial Valence States of Copper on CO₂ Electroreduction

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Induced C C coupling in CO2 photocatalytic reduction via carbothermally reduced nonstoichiometric tungsten oxide

Cited by 13 publications

References 42 publications

Selective Photocatalytic Oxidation of Methane to Oxygenates over Cu–W–TiO2 with Significant Carrier Traps

Selective Photocatalytic Oxidation of Methane to Oxygenates over Cu–W–TiO2 with Significant Carrier Traps

Advances in Modulating the Activity and Selectivity of Photocatalytic CO2 Reduction to Multicarbon Products

Investigating the Effect of the Initial Valence States of Copper on CO2 Electroreduction

Contact Info

Product

Resources

About

Selective Photocatalytic Oxidation of Methane to Oxygenates over Cu–W–TiO₂ with Significant Carrier Traps

Selective Photocatalytic Oxidation of Methane to Oxygenates over Cu–W–TiO₂ with Significant Carrier Traps

Advances in Modulating the Activity and Selectivity of Photocatalytic CO₂ Reduction to Multicarbon Products

Investigating the Effect of the Initial Valence States of Copper on CO₂ Electroreduction