Acidic surface niobium pentoxide is catalytic active for CO2 photoreduction

Silva, Gelson T.S.T. da; Nogueira, André E.; Oliveira, Jéssica A.; Torres, Juliana A.; Lopes, Osmando F.; Ribeiro, Cauê

doi:10.1016/j.apcatb.2018.10.017

Cited by 67 publications

(36 citation statements)

References 51 publications

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“…To determine the acid‐base nature of the SnO 2 surface, the isoelectric point of sample suspensions at different pH values (Figure S6) was determined, which predicts the adsorption behavior of CO 2 molecules during the photoreduction process. As expected, although the values found were close for all samples and in accordance with the literature, a small deviation to alkaline behavior is seen to SnO 2 ‐100, due to the reduction of crystalline surface water (as evidenced by FTIR measurements), which favors that this reaction can take place in lower local pH since below IEP its surface is positively charged [7,10] . Moreover, SnO 2 ‐150 has the more acidic surface, corresponding to its highest CO 2 conversion.…”

Section: Figuresupporting

confidence: 89%

“…This surface interaction is expected to occur in photocatalytic systems since no bias is necessary to promote it, but the reaction would be limited by the band‘s energy [6] . Therefore, to overcome the limitation, the hydroxylation of SnO 2 can, in principle, acts as a charge mediator, reducing the reduction potential to favorable ranges for CO 2 reduction [4,7] . Sn(OH) 4 , the most probable hydroxide in sol‐gel synthesized SnO 2 surfaces, is expected to be reduced to Sn(OH) 2 at lower potentials than H + /H 2 and CO 2 /CO.…”

Section: Figurementioning

confidence: 99%

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Experimental Evidence of CO₂ Photoreduction Activity of SnO₂ Nanoparticles

Torres

Silva

et al. 2020

ChemPhysChem

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Tin dioxide (SnO2) has intrinsic characteristics that do not favor its photocatalytic activity. However, we evidenced that surface modification can positively influence its performance for CO2 photoreduction in the gas phase. The hydroxylation of the SnO2 surface played a role in the CO2 affinity decreasing its reduction potential. The results showed that a certain selectivity for methane (CH4), carbon monoxide (CO), and ethylene (C2H4) is related to different SnO2 hydrothermal annealing. The best performance was seen for SnO2 annealed at 150 °C, with a production of 20.4 μmol g−1 for CH4 and 16.45 μmol g−1 for CO, while for SnO2 at 200 °C the system produced more C2H4, probably due to a decrease of surface −OH groups.

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Section: Figuresupporting

confidence: 89%

Section: Figurementioning

confidence: 99%

Experimental Evidence of CO₂ Photoreduction Activity of SnO₂ Nanoparticles

Torres

Silva

et al. 2020

ChemPhysChem

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“…Recently, da Silva et al investigated the role of Nb 2 O 5 surface acidity for CO 2 reduction performance [95]. Nb 2 O 5 catalysts were prepared through a modified peroxide sol-gel method using different annealing temperatures, and it was verified that the increase in the annealing temperature decreases the surface acidity.…”

Section: Artificial Photosynthesismentioning

confidence: 99%

Recent Advances in Niobium-Based Materials for Photocatalytic Solar Fuel Production

et al. 2020

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The search for renewable and clean energy sources is a key aspect for sustainable development as energy consumption has continuously increased over the years concomitantly with environmental concerns caused by the use of fossil fuels. Semiconductor materials have great potential for acting as photocatalysts for solar fuel production, a potential energy source able to solve both energy and environmental concerns. Among the studied semiconductor materials, those based on niobium pentacation are still shallowly explored, although the number of publications and patents on Nb(V)-based photocatalysts has increased in the last years. A large variety of Nb(V)-based materials exhibit suitable electronic/morphological properties for light-driving reactions. Not only the extensive group of Nb2O5 polymorphs is explored, but also many types of layered niobates, mixed oxides, and Nb(V)-doped semiconductors. Therefore, the aim of this manuscript is to provide a review of the latest developments of niobium based photocatalysts for energy conversion into fuels, more specifically, CO2 reduction to hydrocarbons or H2 evolution from water. Additionally, the main strategies for improving the photocatalytic performance of niobium-based materials are discussed.

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“…The composite spectrum of Nb 2 O 5 /SnO 2 shows that the dominant dispersions can be attributed to Nb 2 O 5 , mainly due to the small SnO 2 . Once again, the SnO 2 did not change the Nb 2 O 5 structure [18,39,40] …”

Section: Resultsmentioning

confidence: 87%

“…In parallel, the surface contributes, as hydroxyl groups induce distortions in the crystalline network, giving them a negative charge and reducing the interactions between the CO 2 /CO and catalyst surfaces [45] . Moreover, the high acidic surface of Nb 2 O 5 contributes to increasing interactions with CO 2 molecules [18] …”

Section: Resultsmentioning

confidence: 99%

A Versatile Nb₂O₅/SnO₂ Heterostructure for Different Environmental Purposes: Water Treatment and Artificial Photosynthesis

Rodrigues

Falsetti

Duque³

et al. 2020

ChemCatChem

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A versatile Nb2O5/SnO2 heterostructure, adequate for different processes, was successfully synthesized by adding SnO2 to the hydrothermal Nb2O5 synthesis process. The presence of SnO2 dispersed over Nb2O5 did not modify its crystalline structure. On the other hand, the properties of the material were strongly affected by coupling the semiconductors. The heterostructure exhibited enhanced photocatalytic performance compared to pure Nb2O5 in the degradation of rhodamine B dye and the amiloride medication under UV radiation, as well as during CO2 photoreduction. Moreover, the heterostructured material was more efficient at removing the cationic species methylene blue dye and Mn (II) from the aqueous solution through adsorption than pure Nb2O5. Its versatility has been explained by reference to the negative surface charge induced by SnO2 and the charge separation in the heterostructure, which increases their lifetimes, making it possible to reach the surface of the material and promote the reaction in the oxidative and reductive processes. Our results indicate that coupled Nb2O5/SnO2 can be a unique platform to different forms of environmental treatment.

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Acidic surface niobium pentoxide is catalytic active for CO2 photoreduction

Cited by 67 publications

References 51 publications

Experimental Evidence of CO₂ Photoreduction Activity of SnO₂ Nanoparticles

Experimental Evidence of CO₂ Photoreduction Activity of SnO₂ Nanoparticles

Recent Advances in Niobium-Based Materials for Photocatalytic Solar Fuel Production

A Versatile Nb₂O₅/SnO₂ Heterostructure for Different Environmental Purposes: Water Treatment and Artificial Photosynthesis

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Acidic surface niobium pentoxide is catalytic active for CO2 photoreduction

Cited by 67 publications

References 51 publications

Experimental Evidence of CO2 Photoreduction Activity of SnO2 Nanoparticles

Experimental Evidence of CO2 Photoreduction Activity of SnO2 Nanoparticles

Recent Advances in Niobium-Based Materials for Photocatalytic Solar Fuel Production

A Versatile Nb2O5/SnO2 Heterostructure for Different Environmental Purposes: Water Treatment and Artificial Photosynthesis

Contact Info

Product

Resources

About

Experimental Evidence of CO₂ Photoreduction Activity of SnO₂ Nanoparticles

Experimental Evidence of CO₂ Photoreduction Activity of SnO₂ Nanoparticles

A Versatile Nb₂O₅/SnO₂ Heterostructure for Different Environmental Purposes: Water Treatment and Artificial Photosynthesis