Sub-15 nm CeO<sub>2</sub> nanowires as an efficient non-noble metal catalyst in the room-temperature oxidation of aniline

Silva, Anderson G. M. da; Batalha, Daniel Carreira; Rodrigues, Thenner Silva; Candido, Eduardo Guimarães; Luz, Sulusmon C.; Freitas, Isabel C. de; Fonseca, Fábio C.; Oliveira, Daniela C. de; Taylor, Jason G.; Torresi, Susana Inês Córdoba de; Camargo, Pedro Henrique Cury de; Fajardo, Humberto V.

doi:10.1039/c7cy02402a

Cited by 45 publications

(35 citation statements)

References 75 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As demonstrated in Figure S9c, the integrated intensity of these peaks is 9 times higher for the CeO 2 nanowires when compared to the CeO 2 nanocubes that can be understood as a dramatical increase of oxygen vacancies. It is noticeable that the CeO 2 nanostructure exposing {110} and {100} facets (nanowires) generated more oxygen vacancies in comparison to {100} ones, in agreement with the literature [24] . The oxygen vacancies increased 5 and 1.2 times after metal impregnation on the CeO 2 nanocubes and CeO 2 nanowires, respectively.…”

Section: Resultssupporting

confidence: 90%

“…However, herein the Pt/CeO 2 nanowires are less active than Pt/CeO 2 nanowires, which contradicts some studies [2,78] . Also, literature discusses the best activities associated with single atoms due to their higher atom efficiency and the increased capacity to create active interfacial sites, [13,14,24] suggesting that isolated single‐atoms of Pt or corner atoms on Pt NPs are highly active for CO oxidation [13,14] …”

Section: Resultsmentioning

confidence: 89%

“…CeO 2 nanocubes: [23] in a typical procedure, 35 CeO 2 nanowires: [24] Typically, 19.6 g of NaOH were dissolved in 35 mL of deionized water and transferred to a 100 mL Teflon vessel. Then, 6.95 g of Ce(NO 3 ) 3 • 6H 2 O were dissolved in 5 mL of deionized water and slowly added to the NaOH solution.…”

Section: Synthesis Of Ceo 2 Supports With Different Morphologiesmentioning

confidence: 99%

See 2 more Smart Citations

Towards the Effect of Pt⁰/Pt^δ+ and Ce³⁺ Species at the Surface of CeO₂ Crystals: Understanding the Nature of the Interactions under CO Oxidation Conditions

Borges

Silva²,

Braga

et al. 2021

ChemCatChem

View full text Add to dashboard Cite

We synthesized CeO2 nanowires and nanocubes showing {110}+{100} and {100} surfaces predominantly, respectively, once the different surface energies play a crucial role in the behavior of Ce4+/Ce3+ reversibility. We found out that Pt/CeO2 nanowires presented more Ce3+ content, oxygen vacancies, and atomically dispersed Pt, indicating a stronger Pt−Ce interaction. In contrast, the Pt/CeO2 nanocubes presented a higher contribution of Ptδ+ species, suggesting a well‐controlled Pt particle size (∼1 nm) and significant interaction with ceria, with oxygen species more available at the surface. Thus, we suggest that the ceria‘s different surface energies may lead to different Pt distributions of species over the supports. H2‐reduction treatment led to changes in Pt structure that showed a better catalysis performance for the Pt/CeO2 nanowires essentially, supported by XPS and CO‐DRIFTS. Nevertheless, this step did not cause improved activity to the point of overcoming the nanocubes‐based catalyst, and the reasons were fully discussed. Herein, we propose that catalysts′ performance depends on a complex combination of several materials′ characteristics. These features may lead to different reaction pathways depending on the pre‐treatment of the samples.

show abstract

Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 89%

Section: Synthesis Of Ceo 2 Supports With Different Morphologiesmentioning

confidence: 99%

See 1 more Smart Citation

Towards the Effect of Pt⁰/Pt^δ+ and Ce³⁺ Species at the Surface of CeO₂ Crystals: Understanding the Nature of the Interactions under CO Oxidation Conditions

Borges

Silva²,

Braga

et al. 2021

ChemCatChem

View full text Add to dashboard Cite

show abstract

“…25 It is possible to observe that all the diffraction peaks of the ceria nanowire are broader and in less intensity in relation to the commercial ceria, which may be related to the formation of smaller crystallites. 23 In the commercial Ni/C-CeO 2 diffractogram, except for the peak at 38.6°, all other peaks present in the material can be clearly seen. Figure 2a shows an image obtained by transmission electron microscopy of Ni/C material.…”

Section: Physical Characterizationmentioning

confidence: 91%

“…Three washes with ethanol and three washes with water were performed. Finally, the prepared materials were dried at 110 °C for 6 h. 23…”

Section: Synthesis Of Cerium Oxide Nanowiresmentioning

confidence: 99%

Ni/C-CeO2 with Different Morphologies of CeO2 Towards Urea Electro-Oxidation Reaction

Tanabe¹,

Barbosa²,

Checca³

et al. 2020

Rev. Virtual Quim.

View full text Add to dashboard Cite

Resumo: A ureia, além de estar presente na urina humana, é produzida como fertilizante em indústrias. Dessa forma, grande quantidade desse composto é lançada diariamente em efluentes. A oxidação eletroquímica da ureia é um método promissor para remoção desse composto. Assim, neste trabalho, nanopartículas de Ni suportadas em carbono e CeO 2 com diferentes morfologias, foram sintetizadas com o intuito de estudar a influência da presença do CeO 2 no processo de eletro-oxidação de ureia. As análises de difração de raios-x (DRX) revelaram a presença das fases Ni° e Ni(OH) 2 e confirmaram a presença do CeO 2 e do carbono. As imagens de microscopia eletrônica de transmissão (MET) confirmaram nanofios de CeO 2 com diâmetros de 15 nm e nanopartículas de Ni com 2 nm de tamanho. A atividade catalítica dos materiais foi investigada por experimentos de voltametria cíclica (VC) e cronoamperometria (CA), nos quais foi mostrado que a presença de céria aumentou a atividade catalítica na reação de oxidação eletroquímica da ureia. Urea, in addition to being present in human urine, is produced as a fertilizer in industries. Thus, a large amount of this compound is discharged daily into effluents. The electrochemical oxidation of urea is a promising method for removing this compound. Thus, in this work, Ni nanoparticles supported on carbon and CeO 2 with different morphologies were synthesized in order to study the influence of CeO 2 in the urea electro-oxidation process. X-ray diffraction (XRD) analyzes revealed the presence of the Ni° and Ni(OH) 2 phases and confirmed the presence of CeO 2 and carbon. Transmission electron microscopy (TEM) images confirmed CeO 2 nanowires with diameter of 15 nm and Ni nanoparticles with 2 nm in size. The catalytic activity of the materials was investigated by cyclic voltammetry (CV) and chronoamperometry (CA) experiments, in which it was shown that the presence of ceria increased the catalytic activity in the electrochemical oxidation of urea reaction.

show abstract

Length‐Controlled Construction of Ceria Nanowires with Ultrafine Diameter and Stable Morphology for Targeted Acute Lung Injury Therapy

Liu

Shi

et al. 2023

Adv Funct Materials

View full text Add to dashboard Cite

The overproduction of reactive oxygen species (ROS) is one of the major reasons for the aggravation of acute lung injury (ALI). Smaller‐sized ceria nanoparticles featured with higher ROS scavenging capability than their bigger‐sized counterparts are potential candidates for ALI therapy. However, smaller‐sized ceria nanoparticles are more easily accumulated in spleen and liver rather than lung. Herein, it is reported that this obstacle can be addressed by constructing ceria into ultrafine nanowires, through which the ultrafine diameter ensures the high ROS scavenging activity and the high aspect ratio promotes the lung targeted accumulation. To demonstrate the feasibility of this conception, a platform is developed to realize length‐controlled ceria nanowires (diameter of ≈1.5 nm) synthesis. These nanowires are PEGylated using a carefully optimized procedure that can preserve their fragile crystal structures. The PEGylated nanowires exhibit higher ROS scavenging capabilities than the ≈3.9 nm sized nanoparticles. Most importantly, lung targeted accumulation can be realized through modulating the length of the nanowires, where the longer nanowires (>100 nm) show much higher lung accumulation. Due to these properties, the longer ceria nanowires can effectively scavenge the overproduced ROS during the progression of ALI, and thereby inhibit the edema and inflammation in the lung tissue.

show abstract

Sub-15 nm CeO₂ nanowires as an efficient non-noble metal catalyst in the room-temperature oxidation of aniline

Abstract: We described the facile synthesis of sub-15 nm CeO2 nanowires for catalyzing the selective synthesis of nitrosobenzene from aniline at room temperature.

Cited by 45 publications

References 75 publications

Towards the Effect of Pt⁰/Pt^δ+ and Ce³⁺ Species at the Surface of CeO₂ Crystals: Understanding the Nature of the Interactions under CO Oxidation Conditions

Towards the Effect of Pt⁰/Pt^δ+ and Ce³⁺ Species at the Surface of CeO₂ Crystals: Understanding the Nature of the Interactions under CO Oxidation Conditions

Ni/C-CeO2 with Different Morphologies of CeO2 Towards Urea Electro-Oxidation Reaction

Length‐Controlled Construction of Ceria Nanowires with Ultrafine Diameter and Stable Morphology for Targeted Acute Lung Injury Therapy

Contact Info

Product

Resources

About

Sub-15 nm CeO2 nanowires as an efficient non-noble metal catalyst in the room-temperature oxidation of aniline

Abstract: We described the facile synthesis of sub-15 nm CeO2 nanowires for catalyzing the selective synthesis of nitrosobenzene from aniline at room temperature.

Cited by 45 publications

References 75 publications

Towards the Effect of Pt0/Ptδ+ and Ce3+ Species at the Surface of CeO2 Crystals: Understanding the Nature of the Interactions under CO Oxidation Conditions

Towards the Effect of Pt0/Ptδ+ and Ce3+ Species at the Surface of CeO2 Crystals: Understanding the Nature of the Interactions under CO Oxidation Conditions

Ni/C-CeO2 with Different Morphologies of CeO2 Towards Urea Electro-Oxidation Reaction

Length‐Controlled Construction of Ceria Nanowires with Ultrafine Diameter and Stable Morphology for Targeted Acute Lung Injury Therapy

Contact Info

Product

Resources

About

Sub-15 nm CeO₂ nanowires as an efficient non-noble metal catalyst in the room-temperature oxidation of aniline

Towards the Effect of Pt⁰/Pt^δ+ and Ce³⁺ Species at the Surface of CeO₂ Crystals: Understanding the Nature of the Interactions under CO Oxidation Conditions

Towards the Effect of Pt⁰/Pt^δ+ and Ce³⁺ Species at the Surface of CeO₂ Crystals: Understanding the Nature of the Interactions under CO Oxidation Conditions