Annealing effect on bandgap energy and photocatalytic properties of CeO2–SiO2 nanocomposite prepared by sol-gel technique

Rani, Neelam; Ahlawat, Rachna; Goswami, Bindiya

doi:10.1016/j.matchemphys.2019.122401

Cited by 34 publications

(14 citation statements)

References 30 publications

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“…This indicated that PtCu/SiO 2 −CeO 2 has a higher energy than PtCu/SiO 2 and PtCu/CeO 2 , which is used to support its increased activity for electronic transition. 34 It can also be seen that the Uv absorption ability of PtCu/ SiO 2 −CeO 2 was stronger than that of PtCu/SiO 2 and PtCu/ CeO 2 , which indicated the formation of large Ce 3+ ions and the presence of defects on the surface of the SiO 2 −CeO 2 nanocomposite. 35 The band gap energies (E g ) of PtCu/SiO 2 , PtCu/CeO 2 , and PtCu/SiO 2 −CeO 2 were calculated using the following equation 36…”

Section: Resultsmentioning

confidence: 88%

Synergetic Effect of SiO₂ and CeO₂ as the Noncarbon Composite Support on Significantly Promoting Methanol Oxidation and Oxygen Reduction Reaction

Yang,

Li,

Zou

et al. 2024

ACS Appl. Eng. Mater.

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Pt/C, as the commonly used electrocatalyst in direct methanol fuel cells, suffers from the difficulty of easy corrosion of the carbon support, which results in a poor catalyst durability in the methanol oxidation reaction (MOR) and oxygen reduction reaction (ORR) processes. The SiO 2 −CeO 2 composite oxide is explored as the noncarbon support to load the PtCu catalyst. PtCu/ SiO 2 −CeO 2 with the nanotube morphology exhibited a specific activity (SA) 10.55 times higher than that of Pt/C toward MOR and an SA 3.33 times higher than that of Pt/C toward ORR. Moreover, PtCu/SiO 2 −CeO 2 shows excellent ORR durability, and the activity became even better after 50,000 cycles. The high performance is due to the synergetic effect of SiO 2 and CeO 2 . CeO 2 causes an impurity level within SiO 2 , which alters the electronic structure and the interaction with PtCu. On the other hand, SiO 2 imposes a confinement effect on CeO 2 and prevents the aggregation of CeO 2 nanoparticles which bind PtCu strongly. The density functional theory calculations reveal that the OOH* adsorption of the PtCu/SiO 2 −CeO 2 structure is further enhanced under the synergistic action, leading to a lower overpotential.

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Section: Resultsmentioning

confidence: 88%

Synergetic Effect of SiO₂ and CeO₂ as the Noncarbon Composite Support on Significantly Promoting Methanol Oxidation and Oxygen Reduction Reaction

Yang,

Li,

Zou

et al. 2024

ACS Appl. Eng. Mater.

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“…The reflectivity of CeO2 can be tuned by doping which results in reduced refractive index and increased band gap. Impurities such as Zr [26][27][28][29] , Ti 28 , Y 30 , Sn 31 , Si 32 , Mn 33 and various lanthanides 34,35 all have the potential to tune the optical parameters of CeO2.…”

Section: Introductionmentioning

confidence: 99%

Doping-induced modulation of electronic, optical and wetting properties of CeO2

Mamedov

Karazhanov

2022

Preprint

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Recently, CeO2 as well as other Rare-Earth Oxides (REOs) have become known as water repelling materials which enables their usage in glass industry. In this study, we investigate electronic, optical and wetting properties of pure and doped CeO2 by first-principles calculations. It is established that introduction of tetravalent doping atoms (Zr, Ti, Sn and Si) significantly modifies the optical response of CeO2 in the visible range by shifting the absorption edge which also effects on the refractive index of the material. For these systems, the water contact angle has been computed through adsorption energy of water layers. We report the intrinsic hydrophilicity of the low-index surfaces of CeO2, which is enhanced by introduction of the impurity atom. Influence of the dopants on the oxygen vacancy formation energy E_f (V_O ) is considered and discussed with respect to its possible effect on the hydrophobic behavior of CeO2. It is found out that all the considered doping atoms reduce E_f (V_O ) , resulting in enhanced adsorption of the air hydrocarbons at the surface, which leads to an increased water contact angle. Based on the obtained results, an assessment on the applicability of doped CeO2 in glass industry is made. It is concluded that Zr-doped CeO2 possesses the most prominent properties among considered systems for the application as transparent layer.

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“…The reflectivity of CeO 2 can be tuned by doping which results in reduced refractive index and increased band gap. Impurities such as Zr [26][27][28][29], Ti [28], Y [30], Sn [31], Si [32], Mn [33] and various lanthanides [34,35] all have the potential to tune the optical parameters of CeO 2 .…”

Section: Introductionmentioning

confidence: 99%

Doping-Induced Modulation of Electronic, Optical and Wetting Properties of Ceo2

Mamedov¹,

Karazhanov²

2022

SSRN Journal

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Annealing effect on bandgap energy and photocatalytic properties of CeO2–SiO2 nanocomposite prepared by sol-gel technique

Cited by 34 publications

References 30 publications

Synergetic Effect of SiO₂ and CeO₂ as the Noncarbon Composite Support on Significantly Promoting Methanol Oxidation and Oxygen Reduction Reaction

Synergetic Effect of SiO₂ and CeO₂ as the Noncarbon Composite Support on Significantly Promoting Methanol Oxidation and Oxygen Reduction Reaction

Doping-induced modulation of electronic, optical and wetting properties of CeO2

Doping-Induced Modulation of Electronic, Optical and Wetting Properties of Ceo2

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Annealing effect on bandgap energy and photocatalytic properties of CeO2–SiO2 nanocomposite prepared by sol-gel technique

Cited by 34 publications

References 30 publications

Synergetic Effect of SiO2 and CeO2 as the Noncarbon Composite Support on Significantly Promoting Methanol Oxidation and Oxygen Reduction Reaction

Synergetic Effect of SiO2 and CeO2 as the Noncarbon Composite Support on Significantly Promoting Methanol Oxidation and Oxygen Reduction Reaction

Doping-induced modulation of electronic, optical and wetting properties of CeO2

Doping-Induced Modulation of Electronic, Optical and Wetting Properties of Ceo2

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Product

Resources

About

Synergetic Effect of SiO₂ and CeO₂ as the Noncarbon Composite Support on Significantly Promoting Methanol Oxidation and Oxygen Reduction Reaction

Synergetic Effect of SiO₂ and CeO₂ as the Noncarbon Composite Support on Significantly Promoting Methanol Oxidation and Oxygen Reduction Reaction