Preparation and Spectroscopic, Microscopic, Thermogravimetric, and Electrochemical Characterization of Silver-Doped Cerium(IV) Oxide Nanoparticles

Ansari, Anees A.; Labis, Joselito P.; Alam, Manawwer; Ramay, Shahid M.; Ahmed, N.; Mahmood, Asif

doi:10.1080/00032719.2016.1218499

Cited by 13 publications

(7 citation statements)

References 33 publications

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“…In summary, Ag atoms deposited on a stoichiometric CeO 2 surface tend to result in reduction of the Ce ions, which leads to the stabilization of the Ag in the +1 oxidation state. These results are in good agreement with the literature reports [43][44][45].…”

Section: Catalyst Characterizationsupporting

confidence: 83%

Catalytic Performance of Ag2O and Ag Doped CeO2 Prepared by Atomic Layer Deposition for Diesel Soot Oxidation

et al. 2018

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Abstract:The catalytic behaviour of Ag 2 O and Ag doped CeO 2 thin films, deposited by atomic layer deposition (ALD), was investigated for diesel soot oxidation. The silver oxide was deposited from pulses of the organometallic precursor (hfac)Ag(PMe 3 ) and ozone at 200 • C with growth rate of 0.28 Å/cycle. Thickness, crystallinity, elemental composition, and morphology of the Ag 2 O and Ag doped CeO 2 films deposited on Si (100) were characterized by ellipsometry, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and field emission scanning electron microscopy (FESEM), respectively. The catalytic effect on diesel soot combustion of pure Ag 2 O, CeO 2, and Ag doped CeO 2 films grown on stainless steel foil supports was measured with oxidation tests. Nominally CeO 2 :Ag 10:1 doped CeO 2 films were most effective and oxidized 100% of soot at 390 • C, while the Ag 2 O films were 100% effective at 410 • C. The doped films also showed much higher stability; their performance remained stable after five tests with only a 10% initial reduction in efficiency whereas the performance of the Ag 2 O films reduced by 50% after the first test. It was concluded that the presence of Ag + sites on the catalyst is responsible for the high soot oxidation activity.

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Section: Catalyst Characterizationsupporting

confidence: 83%

Catalytic Performance of Ag2O and Ag Doped CeO2 Prepared by Atomic Layer Deposition for Diesel Soot Oxidation

et al. 2018

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“…[14] Zhang et al developed a series of single-atom nanozymes catalytically surpassing natural enzymes, and importantly providing an atomic substitution strategy for the catalytic selectivity regulation of catalase (CAT)-, superoxide dismutase (SOD)-, and glutathione peroxidase-mimetic activities. [23] Cerium oxide (CeO 2 ) nanoparticles possess high specific surface area, oxygen vacancies sites, and redox reversible Ce 4+ /Ce 3+ cycles, making them useful for many technical applications, such as biomedical, [13,[26][27][28][29] electrocatalytic, [30][31][32] and environmental governance. [33] However, the catalytic activity of CeO 2 nanozymes is still limited, the complex structure and composition lead to unclear catalytic active sites and difficult research on the catalytic mechanism.…”

Section: Introductionmentioning

confidence: 99%

Multienzyme‐Mimetic Activity of Gold/Cerium Oxide Nanozyme

Wang

Ruan

et al. 2023

Part & Part Syst Charact

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Redox‐active nanozymes offer low‐cost controlled synthesis, high stability, and tunable catalytic properties over natural enzymes, which have attracted wide attention in the field of disease diagnosis and treatment. However, the improvement of catalytic activity remains an important challenge for nanozymes. Herein, the Au/CeO2 nanozymes is developed to achieve enhanced multiple enzyme‐mimetic activity. The Au/CeO2 nanozymes at 5% doping possess best peroxidase‐like activity with threefold higher catalytic rate than CeO2. For catalase‐mimic catalysis, the Au/CeO2 nanozymes at 5% doping also exhibited a 1.5‐fold enhanced reaction rate higher than pure CeO2. The superoxide dismutase (SOD)‐like capacity of Au/CeO2 nanozymes is proportional to Au content. The Au/CeO2 nanozymes at 10% doping show optimal SOD‐like capacity of 60.2 U mg−1. In vitro experiments validate the regulation ability of intracellular oxidative stress and inflammation. Au/CeO2 nanozymes can reduce lipopolysaccharide‐ or H2O2‐induced oxidative damage by scavenging excess ROS in nerve cell. Therefore, Au/CeO2 can be used as a promising antioxidant in disease treatment, and the study offers general guidelines for achieving enhanced biocatalytic property through atomic doping.

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“…It has been recognized that the crystal planes exposed to semiconductor metal oxides that de ne the surface arrangement and structure of the surface have a signi cant effect on their exterior reactivity and electro-catalytic e ciency. Among the various semiconductor metal oxides, cerium oxide has been considered the most fascinating semiconductor metal oxide, because its unique physiochemical properties make them differ from the rest of the semiconductor metal oxides [17][18][19][20]. CeO 2 demonstrate reversible oxidation states, resulting it exhibits redox characteristic and high oxygen storage ability [17,19,20].…”

Section: Introductionmentioning

confidence: 99%

“…Among the various semiconductor metal oxides, cerium oxide has been considered the most fascinating semiconductor metal oxide, because its unique physiochemical properties make them differ from the rest of the semiconductor metal oxides [17][18][19][20]. CeO 2 demonstrate reversible oxidation states, resulting it exhibits redox characteristic and high oxygen storage ability [17,19,20]. These novel properties raise their technological applications in extensive elds such as gas sensors, catalysts, photo-catalysts, capacitors, hydro-splitting, solid fuel cells, UV resistance, and polishing materials.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, due to their charge compensation within the lattice, the dopant ions can dramatically upsurge the number of ionic compounds, resulting in high electro-oxidation of the redox species' properties. Recently some efforts have shown that the addition of transition metal ions impurities remarkably enhanced the conducting as well as magnetic properties as prepared by chemical routes [17][18][19][20]27].…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical sensitive detection of hydrazine through cobalt-doped cerium oxide nanostructured platform

Ansari

Alam

2021

J Mater Sci: Mater Electron

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Chemically synthesized cobalt-doped cerium oxide nanoparticles(CeO 2 :Co;NPs) were successfully prepared by complexed based co-precipitation process. The structural, morphological, chemical composition, optical properties, and electro-catalytic properties were determined by X-ray diffraction pattern(XRD), transmission electron microscopy(TEM), energy dispersive x-ray analysis (EDX), UV/Visible absorption spectroscopy, and cyclic voltammetry techniques. Owing to the wide-spread applications of CeO 2 NPs in various elds of applied material sciences, transition metal ions doped CeO 2 :Co NPs exhibited excellent electro-catalytic properties. Outstanding physiochemical properties of CeO 2 such as reversible oxidation states, high ionic mobility, large oxygen storage ability, effective large speci c surface area, and the excellent current response observed in the electrocatalytic oxidation of hydrazine. The presence of transition metal ions (cobalt) improves the oxidation potential of hydrazine. Cyclic voltammetry was analog with the electrochemical impedance spectroscopy results, which revealed the enhanced with rapid sensing response against hydrazine. The electro-catalytic results of the CeO 2 :Co NPs electrode exhibited excellent voltammetry and impedance spectroscopy performance towards the hydrazine oxidation. The fabricated chemical sensor shows a wide linear detection range from 7.18 to 1000 µM, a low detection limit 7.2 µM, and sensitivity of 2.42 µAmLµM -1 cm -2 . The fabricated sensing electrode demonstrated long-term steadiness resulting it shows high sensitivity, selectivity, repeatability/reproducibility, and rapid detection of hydrazine.

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Preparation and Spectroscopic, Microscopic, Thermogravimetric, and Electrochemical Characterization of Silver-Doped Cerium(IV) Oxide Nanoparticles

Cited by 13 publications

References 33 publications

Catalytic Performance of Ag2O and Ag Doped CeO2 Prepared by Atomic Layer Deposition for Diesel Soot Oxidation

Catalytic Performance of Ag2O and Ag Doped CeO2 Prepared by Atomic Layer Deposition for Diesel Soot Oxidation

Multienzyme‐Mimetic Activity of Gold/Cerium Oxide Nanozyme

Electrochemical sensitive detection of hydrazine through cobalt-doped cerium oxide nanostructured platform

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