Unveiling CuO role in CO2 photoreduction process – Catalyst or reactant?

Nogueira, André E.; Silva, Gelson T.S.T. da; Oliveira, Jéssica A.; Torres, Juliana A.; Silva, Mitchell G. S. da; Carmo, Marcelo; Ribeiro, Cauê

doi:10.1016/j.catcom.2020.105929

Cited by 25 publications

(20 citation statements)

References 26 publications

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“…The column and detectors were kept at 40 °C. 18 Reactions were monitored by gas sampling in the reactor headspace (200 mL) at regular intervals. Gaseous products were determined by means of gas chromatography using a TCD and FID Varian, CP-3800.…”

Section: Methodsmentioning

confidence: 99%

“…10 Moreover, the synthesis method plays a critical role, and small variations in particle size and surface chemistry can compromise the catalyst's performance. 18 We hypothesize that this instability is because of the associated oxidation reaction over the surface: when the electron−hole pair is formed, while electrons are used to reduce CO 2 , the holes oxidize water into O 2 in the same particle, leading to further reactions that tend to induce poisoning. Therefore, charge separation is also crucial to maintaining CuO activity, which can be promoted through suitable heterojunction with other semiconductors.…”

Section: Introductionmentioning

confidence: 99%

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CuO Decoration Controls Nb₂O₅ Photocatalyst Selectivity in CO₂ Reduction

Nogueira

Silva

Oliveira

et al. 2020

ACS Appl. Energy Mater.

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The reformation of CO 2 through photocatalytic processes to obtain products with high energy value and compatibility with the current energy infrastructure is a compelling strategy to minimize the emission of CO 2 into the atmosphere, one of the main greenhouse gases. However, practical application of such a photocatalytic system requires significant efforts for improved CO 2 photoreduction performance and product selectivity. Thus, in the present work, CuO nanoparticles were combined with Nb 2 O 5 in order to improve the photocatalytic properties of these semiconductors in the CO 2 photoreduction process. Nb 2 O 5 / CuO heterojunctions were prepared via a solvothermal treatment method, while the experimental tools, such as FESEM, HRTEM, and DRS, were employed to evaluate the microstructural and electronic properties. We describe how CuO decoration over Nb 2 O 5 adjusts its selectivity for CO 2 reduction to CH 4 , HCOOH, or H 3 CCOOH in different contents. An investigation of CO 2 photoreduction using different electron donors/scavengers (water, sodium oxalate, and potassium bromate) under ultraviolet radiation revealed that its decoration influences local CO production by modifying the selectivity. CO has been confirmed as the main intermediate for HCOOH and CH 3 COOH production, and CO 2 reduction efficiency increases at low CuO content (2.5% wt), leading to the formation of soluble hydrocarbons, and increases for CH 4 in higher amounts (10% wt).

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

CuO Decoration Controls Nb₂O₅ Photocatalyst Selectivity in CO₂ Reduction

Nogueira

Silva

Oliveira

et al. 2020

ACS Appl. Energy Mater.

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“…21 Moreover, the photoreduction process becomes exclusive due to the use of scarcely available elements. [22][23][24] Although several such inclusive studies were reported, there still lay ample opportunities for the in-depth investigation leading to the development of synthesis routes to improve application effectiveness.…”

Section: Introductionmentioning

confidence: 99%

“…In this context, CuO is a promising candidate owing to excellent optoelectronic properties stemming from the weakly bonded d-electrons and chemistry with CO 2 gas due to low electron affinity. [23][24][25] Within this framework, we report on oxygen deficient CuO nanostructures synthesized using a water-hexane biphasic solvent. Insights into the growth mechanism of 6 nanostructures formed by varying oleic acid amounts were detailed.…”

Section: Introductionmentioning

confidence: 99%

Oleic acid induced tailored morphological features and structural defects in CuO for multifunctional applications

Kulkarni

Satbhai

et al. 2022

Mater. Adv.

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“…[3][4][5] Examples include semiconductors, such as TiO 2 and ZnO, which photooxidize organic compounds in aqueous systems; [6,7] SiO 2 removes Mn(II) from effluents through adsorption; [8] and CuO catalyzes CO 2 photoreduction processes. [9] However, semiconductors in isolated form exhibit some limitations, such as rapid electron/hole recombination and poor solar light harvesting. Thus, the development of composite materials appears to be a viable way to improve photocatalytic performance.…”

Section: Introductionmentioning

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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Unveiling CuO role in CO2 photoreduction process – Catalyst or reactant?

Cited by 25 publications

References 26 publications

CuO Decoration Controls Nb₂O₅ Photocatalyst Selectivity in CO₂ Reduction

CuO Decoration Controls Nb₂O₅ Photocatalyst Selectivity in CO₂ Reduction

Oleic acid induced tailored morphological features and structural defects in CuO for multifunctional applications

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

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Unveiling CuO role in CO2 photoreduction process – Catalyst or reactant?

Cited by 25 publications

References 26 publications

CuO Decoration Controls Nb2O5 Photocatalyst Selectivity in CO2 Reduction

CuO Decoration Controls Nb2O5 Photocatalyst Selectivity in CO2 Reduction

Oleic acid induced tailored morphological features and structural defects in CuO for multifunctional applications

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

Contact Info

Product

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CuO Decoration Controls Nb₂O₅ Photocatalyst Selectivity in CO₂ Reduction

CuO Decoration Controls Nb₂O₅ Photocatalyst Selectivity in CO₂ Reduction

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