Role of oxygen vacancies in Ag/Au doped CeO2 nanoparticles for fast photocatalysis

Mittal, Manish; Gupta, Aayush; Pandey, O.P.

doi:10.1016/j.solener.2018.03.033

Cited by 159 publications

(58 citation statements)

References 47 publications

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“…6, it is observed that the E gap of the thin films obtained in this study ranged between 2.78 and 3.15 eV. These values were in accordance with the E gap reported in the literature for CeO 2 [31,32]. From Fig.…”

Section: Methodssupporting

confidence: 91%

Study of obtaining thin films of CeO2 doped with 2 and 4 mol% of europium, terbium and thulium by spin coating: photocatalytic properties

Dias

2019

Cerâmica

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In this study, thin films of Eu3+, Tb3+ and Tm3+ doped CeO2 in the proportions of 2 and 4 mol% were obtained by spin coating and calcined at 700 °C. The films were characterized by XRD, SEM, AFM and UV-vis techniques. The photocatalytic activity of the thin films was measured by the degradation of the methylene blue (MB) dye. The thin films were submitted to 4 photocatalytic cycles to analyze the capacity to be reused. XRD patterns showed no secondary phase formation, where all characteristic peaks were related to CeO2. SEM micrographs indicated that doping at 4 mol% promoted the reduction in the thickness and surface porosity of the thin films. AFM images indicated the increase in surface roughness with rare earths doping. Doping with Eu3+, Tb3+ and Tm3+ increased the degradation of the methylene blue dye by at least 15% for thin films doped at 4 mol%. The reuse tests indicated that the photocatalytic activity remained practically constant even with the application of four consecutive cycles.

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Section: Methodssupporting

confidence: 91%

Study of obtaining thin films of CeO2 doped with 2 and 4 mol% of europium, terbium and thulium by spin coating: photocatalytic properties

Dias

2019

Cerâmica

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“…Meanwhile, the shape of the (111) peaks also becomes broaden and asymmetrical, due to the smaller of the grain size and higher concentrations of the defects in lattice . This phenomenon proves that dopants have been inserted into ceria and substituted Ce 4+ ions . The lattice constants of the obtained samples are fitted as presented in Figure B.…”

Section: Resultsmentioning

confidence: 86%

Research on microstructure and catalysis effects on hydrogen storage alloy of nanosized three ions co‐doped Ce _{1−3
x} Cu _x Fe _x Zn _x O ₂

Zhang

et al. 2020

Int J Energy Res

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Summary Ce1−3xCu xFe xZn xO2 nano‐particles were synthesized by hydrothermal method. The micro‐structure, spectra features and catalysis effects on hydrogen storage alloy of Ce1−3xCu xFe xZn xO2 were studied. It was researched that the dopants were inserted into the lattice of CeO2 and the solid solubility x was identified as 0.05. The oxygen vacancies contents and degree of lattice distortion were improved, and the band gap energies were decreased. The hydrogen absorption/desorption kinetics of Mg60La10Ni20‐5 mol%Ce1−3xCu xFe xZn xO2 composites were evaluated. The results showed that the catalysts effects were improved by enhancing the doped concentrations. The catalysis mechanism was related with the microstructure and micro‐electronic structure of the catalysts.

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“…In Ref. [188], the correlation between Ce 3+ loading, amount of oxygen vacancies and activity of Ag/CeO 2 and Au/CeO 2 catalysts in photodegradation of rhodamine blue dye in an aqueous medium under UV-vis irradiations were found. The conditions of synthesis (pH of precipitation) and Ag/Au loading provided different Ce 3+ loading, distortion of CeO 2 lattice and concentration of vacancies.…”

Section: Electrocatalysismentioning

confidence: 99%

Ag/CeO2 Composites for Catalytic Abatement of CO, Soot and VOCs

et al. 2018

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Nowadays catalytic technologies are widely used to purify indoor and outdoor air from harmful compounds. Recently, Ag-CeO 2 composites have found various applications in catalysis due to distinctive physical-chemical properties and relatively low costs as compared to those based on other noble metals. Currently, metal-support interaction is considered the key factor that determines high catalytic performance of silver-ceria composites. Despite thorough investigations, several questions remain debating. Among such issues, there are (1) morphology and size effects of both Ag and CeO 2 particles, including their defective structure, (2) chemical and charge state of silver, (3) charge transfer between silver and ceria, (4) role of oxygen vacancies, (5) reducibility of support and the catalyst on the basis thereof. In this review, we consider recent advances and trends on the role of silver-ceria interactions in catalytic performance of Ag/CeO 2 composites in low-temperature CO oxidation, soot oxidation, and volatile organic compounds (VOCs) abatement. Promising photoand electrocatalytic applications of Ag/CeO 2 composites are also discussed.Au [17][18][19][20][21][22][23], Ru [24,25], Rh [26][27][28][29], and Cu [30,31] were proposed. Metal oxide-based catalysts (Co 3 O 4 [32], MnO x [33], etc.) also attracted wide interest. However, a significant part of the developed catalysts has limited use under real conditions due to high costs of noble metals (the loading of palladium, platinum, gold is of 2-10 wt. %), relatively low stability to "hard" conditions of oxidation processes causing the loss of active component and reduction of the catalyst activity and selectivity. Therefore, the development of high-performance affordable and stable catalysts for low-temperature total oxidation of harmful compounds is still challenging. Efficiency and costs of such catalysts are connected with proper selection of the type of active component, support, and preparation method [34].Recently, supported silver catalysts have brought about wide interest due to their high activity in low-temperature oxidation processes. Different supports are studied (SiO 2 , CeO 2 , MnO x , TiO 2 , Al 2 O 3 , ZrO 2 , etc.) [35][36][37][38]. It is shown that an enhanced catalytic activity of Ag-based catalysts can be achieved by using reducible metal oxides as supports and by controlling the metal-support interaction to provide synergistic effect between active sites of the support and noble metal [39].Among the supports mentioned, CeO 2 brings about high interest, since it combines exceptional redox and acid-base properties with oxygen storage, which can be controlled by proper preparation methods and treatments. Moreover, these distinctive properties of ceria cause its wide applications as a support for catalysts. For this reason, highly active and relatively inexpensive Ag/CeO 2 composite is considered promising heterogeneous catalyst for total oxidation of harmful organic compounds, including formaldehyde [40], , soot [44][45][46][47][48][49]. The Ag...

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Role of oxygen vacancies in Ag/Au doped CeO2 nanoparticles for fast photocatalysis

Cited by 159 publications

References 47 publications

Study of obtaining thin films of CeO2 doped with 2 and 4 mol% of europium, terbium and thulium by spin coating: photocatalytic properties

Study of obtaining thin films of CeO2 doped with 2 and 4 mol% of europium, terbium and thulium by spin coating: photocatalytic properties

Research on microstructure and catalysis effects on hydrogen storage alloy of nanosized three ions co‐doped Ce _{1−3
x} Cu _x Fe _x Zn _x O ₂

Ag/CeO2 Composites for Catalytic Abatement of CO, Soot and VOCs

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Role of oxygen vacancies in Ag/Au doped CeO2 nanoparticles for fast photocatalysis

Cited by 159 publications

References 47 publications

Study of obtaining thin films of CeO2 doped with 2 and 4 mol% of europium, terbium and thulium by spin coating: photocatalytic properties

Study of obtaining thin films of CeO2 doped with 2 and 4 mol% of europium, terbium and thulium by spin coating: photocatalytic properties

Research on microstructure and catalysis effects on hydrogen storage alloy of nanosized three ions co‐doped Ce 1−3 x Cu x Fe x Zn x O 2

Ag/CeO2 Composites for Catalytic Abatement of CO, Soot and VOCs

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Research on microstructure and catalysis effects on hydrogen storage alloy of nanosized three ions co‐doped Ce _{1−3
x} Cu _x Fe _x Zn _x O ₂