Design of core–shell titania–heteropolyacid–metal nanocomposites for photocatalytic reduction of CO<sub>2</sub> to CO at ambient temperature

Yu, Xiang; Moldovan, Simona; Khodakov, Andreï Y.

doi:10.1039/c9na00398c

Cited by 6 publications

(3 citation statements)

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“…The band gap energy, estimated using Tauc's plots, varies from 2.8 eV to 3.2 eV [42][43][44] . Note that the value of band gap in TiO2 is close to that in HPW 34,41 . Interestingly, a much smaller band gap was observed in Ag-HPW/SiO2 compared to Ag-HPW/TiO2.…”

Section: Photochemical Coupling Of Methane Over Metal Nanocompositessupporting

confidence: 53%

“…Thus, a major increase in the C2H6 production from methane only occurs when the nanocomposite combines together TiO2, HPW and Ag. HPW has been discovered previously [37][38][39][40][41] as highly efficient for transfer of holes and electrons from TiO2. The photochemical performance of the HPW/TiO2 nanocomposite can be enhanced by p-n semiconductor heterojunction, created by the addition of a semiconductor with lower levels of valence and conduction bands to TiO2.…”

Section: Photochemical Coupling Of Methane Over Metal Nanocompositesmentioning

confidence: 99%

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Stoichiometric methane conversion to ethane using photochemical looping at ambient temperature

et al. 2020

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Methane activation and utilization are among the major challenges of modern science. Methane is potentially an important feedstock for manufacturing value-added fuels and chemicals. However, most of known processes require excessive operating temperatures and exhibit insufficient selectivity. Here, we demonstrate a photochemical looping strategy for highly selective stoichiometric conversion of methane to ethane at ambient temperature over silverheteropolyacid-titania nanocomposites. The process involves stoichiometric reaction of methane with highly-dispersed cationic silver under illumination, which results in the formation of methyl radicals. Recombination of the generated methyl radicals leads to selective, and almost quantitative, formation of ethane. Cationic silver species are simultaneously reduced to metallic silver. The silver-heteropolyacid-titania nanocomposites can be reversibly regenerated in air under illumination at ambient temperature. The photochemical looping process achieves methane coupling selectivity over 90%, quantitative yield of ethane over 9%, high quantum efficiency (3.5% at 362 nm) and excellent stability.

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Section: Photochemical Coupling Of Methane Over Metal Nanocompositessupporting

confidence: 53%

Section: Photochemical Coupling Of Methane Over Metal Nanocompositesmentioning

confidence: 99%

Stoichiometric methane conversion to ethane using photochemical looping at ambient temperature

et al. 2020

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“…Water or molecular hydrogen usually are the reducing agents. They provide necessary protons, fuel electron transfers 87 and are oxidised to molecular oxygen and water, respectively. The term "artificial photosynthesis" 88,89 is used when the photocatalysis simultaneously involves the CO2 reduction and water oxidation.…”

Section: Non-noble Metal Complexes (Co Mn Fe)mentioning

confidence: 99%

Highlights and challenges in the selective reduction of carbon dioxide to methanol

et al. 2021

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Carbon dioxide is an iconic greenhouse gas and a major factor for current global climate changes, making essential its capture and recycling into valuable products and fuels.Methanol is a key compound that could be obtained from the 6-electrons, 6-protons CO2 reduction and that can be used both as a fuel and as a platform-molecule. The goal of this review is to present a comparative analysis of the CO2 reduction routes to methanol via heterogeneous and homogeneous catalytic hydrogenation, as well as enzymatic, photo-and electro-catalysis.After identifying catalytic materials and reaction conditions, we provide a comparative assessment of their respective advantages and drawbacks in terms of selectivity, productivity, stability, operating conditions, cost and technical readiness level. Currently, heterogeneous hydrogenation catalysis and electrocatalysis have the highest potential for the CO2 reduction to methanol at larger scale. Availability and price of sustainable electricity appear as essential prerequisites for efficient methanol synthesis from CO2.

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Metal‐Semiconductor Heterostructures for Photoredox Catalysis: Where Are We Now and Where Do We Go?

Geng

et al. 2021

Adv Funct Materials

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The ability of metal nanocrystals (NCs) to maneuver light, trap charge carriers, and enrich reactive sites for photoredox reactions has received considerable attention for constructing metal‐semiconductor heterostructures (MSHs) toward solar‐to‐chemical production. In this review, the comprehensive and fundamental understanding of the structure‐property‐catalysis interplays of MSHs is mainly described. The fundamentals, including basic concepts, and critical insights of MSH‐mediated photoredox catalysis, are first demonstrated. Particular focus is placed on the state‐of‐the‐art technological advances in monitoring the key photophysical/photochemical processes associated with MSH‐mediated photoredox catalysis, followed by highlighting the design parameters for high‐performance MSHs. Then, the applications of MSHs for solar energy conversion, especially for some emerging reaction types are discussed. This review is concluded by casting a perspective on the challenges as well as the opportunities for further promoting this burgeoning field.

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Design of core–shell titania–heteropolyacid–metal nanocomposites for photocatalytic reduction of CO₂ to CO at ambient temperature

Abstract: We report new efficient core–shell nanocomposites for photocatalytic CO2 to CO conversion at ambient temperature with enhanced yield and selectivity.

Cited by 6 publications

References 62 publications

Stoichiometric methane conversion to ethane using photochemical looping at ambient temperature

Stoichiometric methane conversion to ethane using photochemical looping at ambient temperature

Highlights and challenges in the selective reduction of carbon dioxide to methanol

Metal‐Semiconductor Heterostructures for Photoredox Catalysis: Where Are We Now and Where Do We Go?

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Design of core–shell titania–heteropolyacid–metal nanocomposites for photocatalytic reduction of CO2 to CO at ambient temperature

Abstract: We report new efficient core–shell nanocomposites for photocatalytic CO2 to CO conversion at ambient temperature with enhanced yield and selectivity.

Cited by 6 publications

References 62 publications

Stoichiometric methane conversion to ethane using photochemical looping at ambient temperature

Stoichiometric methane conversion to ethane using photochemical looping at ambient temperature

Highlights and challenges in the selective reduction of carbon dioxide to methanol

Metal‐Semiconductor Heterostructures for Photoredox Catalysis: Where Are We Now and Where Do We Go?

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Design of core–shell titania–heteropolyacid–metal nanocomposites for photocatalytic reduction of CO₂ to CO at ambient temperature