Optimization of plasmon-induced photocatalysis in electrospun Au/CeO 2 hybrid nanofibers for selective oxidation of benzyl alcohol

Li, Benxia; Zhang, Baoshan; Nie, Shibin; Shao, Liangzhi; Hu, Luyang

doi:10.1016/j.jcat.2016.12.025

Cited by 99 publications

(47 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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: 90%

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

View full text Add to dashboard Cite

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.

show abstract

Section: Methodssupporting

confidence: 90%

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

View full text Add to dashboard Cite

show abstract

“…[35][36][37] The Au 4f spectrum ( Figure 2b)o fA u@CeO 2 shows two peaks at binding energies of 83.9 and 87.6 eV,c orresponding to Au 4f 7/2 and Au 4f 5/2 ,r espectively. [17,34] Another two peaks appeared at binding energies of 84.8 and 88.8 eV in the Au 4f spectrum;t hese can be indexedt ot he AuÀOÀCe bonds formed, [35][36][37][38] which are beneficial for improving the stability of Au@CeO 2 during electrocatalysis ands upport the Ce 3d XPS results. Figure2cs hows the N 2 adsorption-desorption isotherms of CeO 2 and Au@CeO 2 ,p resenting at ypical typeIVi sotherm with ah ysteresis loop;t hus implyingp orouss tructures.…”

Section: Resultsmentioning

confidence: 90%

“…Figure 2a shows the high-resolution Ce 3d XPS spectra of pure CeO 2 and Au@CeO 2 .T he Ce 3d spectra of theset wo samples can be divided into eight peaks:t wo peaks at 885.4 and 904.1 eV are as-cribed to Ce 3 + ,w hereas the other six peaks at 882.7, 889.1, 898.6,9 01.2, 908.4, and 917.0 eV can be indexed to Ce 4 + . [33,34] Ce 3d spectral analysisi ndicates that Ce 3 + and Ce 4 + in pure CeO 2 and Au@CeO 2 coexist; moreover,t he Ce 3 + content accounts for 18.8 %o ft otal Ce in Au@CeO 2 ,w hich is slightly higher than that (18.6 %) in pure CeO 2 (Table S1 in the Supporting Information). The above XPS results reveal that Ce 3 + species in pure CeO 2 and Au@CeO 2 are abundant,w hich indicates the formation of rich oxygen vacancy defects in these two samples.…”

Section: Resultsmentioning

confidence: 97%

Ambient Electrosynthesis of Ammonia on a Core–Shell‐Structured Au@CeO₂ Catalyst: Contribution of Oxygen Vacancies in CeO₂

Liu

Cui

Han

et al. 2019

Chemistry A European J

View full text Add to dashboard Cite

Electrosynthesis of NH3 through the N2 reduction reaction (NRR) under ambient conditions is regarded as promising technology to replace the industrial energy‐ and capital‐intensive Haber–Bosch process. Herein, a room‐temperature spontaneous redox approach to fabricate a core–shell‐structured Au@CeO2 composite, with Au nanoparticle sizes below about 10 nm and a loading amount of 3.6 wt %, is reported for the NRR. The results demonstrate that as‐synthesized Au@CeO2 possesses a surface area of 40.7 m2 g−1 and a porous structure. As an electrocatalyst, it exhibits high NRR activity, with an NH3 yield rate of 28.2 μg h−1 cm−2 (10.6 μg h−1 mg−1cat., 293.8 μg h−1 mg−1Au) and a faradaic efficiency of 9.50 % at −0.4 V versus a reversible hydrogen electrode in 0.01 m H2SO4 electrolyte. The characterization results reveal the presence of rich oxygen vacancies in the CeO2 nanoparticle shell of Au@CeO2; these are favorable for N2 adsorption and activation for the NRR. This has been further verified by theoretical calculations. The abundant oxygen vacancies in the CeO2 nanoparticle shell, combined with the Au nanoparticle core of Au@CeO2, are electrocatalytically active sites for the NRR, and thus, synergistically enhance the conversion of N2 into NH3.

show abstract

“…Similar conclusions have also been drawn by other researchers. [19,34,37] Recently, various photocatalysts have been investigated for selective photocatalytic oxidation of benzyl alcohol to benzaldehyde, [38][39][40][41][42] and their activities are listed in Table S1. It is found that the 0.95Ru/3DOM BiVO 4 À Ar-300 sample showed better photocatalytic performance than most of the reported photocatalysts (except 0.3 wt % Pt/Bi 2 MoO 6 ).…”

Section: Resultsmentioning

confidence: 99%

Ru Nanoparticles Supported on Oxygen‐Deficient 3DOM BiVO₄: High‐Performance Catalysts for the Visible‐Light‐Driven Selective Oxidation of Benzyl Alcohol

et al. 2019

View full text Add to dashboard Cite

Developing novel photocatalysts for green synthesis of important organic intermediates under mild conditions is of great significance in industry. In this work, we synthesized the oxygen-deficient three-dimensionally ordered macroporous (3DOM) BiVO 4 -supported nanosized Ru (xRu/3DOM BiVO 4 , x = 0.24-2.16 wt %) catalysts by the polymethyl methacrylatetemplating, ethylene glycol reduction, and post-thermal treatment methods. Physicochemical properties of the materials were characterized using the various techniques, and their catalytic activities for the visible-light-driven selective oxidation of benzyl alcohol to benzaldehyde were measured. It is found that the Ru nanoparticles (NPs) with a size of 1.2-1.5 nm were uniformly dispersed on the surface of 3DOM BiVO 4 , which gave rise to a significant enhancement in photocatalytic activity.Benzyl alcohol conversion first went up and then dropped down with the rise in loading of Ru NPs. The 0.95Ru/3DOM BiVO 4 À Ar-300 sample was thermally treated in an Ar flow at 300°C for 4 h showed the highest benzyl alcohol conversion (78 %) with a benzaldehyde selectivity of 100 % (benzaldehyde formation rate was 1380 μmol/(g h) after 6 h of illumination) and good photocatalytic stability. The high dispersion of Ru NPs and formation of oxygen vacancies in 3DOM BiVO 4 improved separation and transfer efficiency of the photogenerated electrons/holes and increased the superoxide radical concentration. In addition, the possible mechanism of benzyl alcohol oxidation over 0.95Ru/3DOM BiVO 4 À Ar-300 was also discussed.

show abstract

Optimization of plasmon-induced photocatalysis in electrospun Au/CeO 2 hybrid nanofibers for selective oxidation of benzyl alcohol

Cited by 99 publications

References 48 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

Ambient Electrosynthesis of Ammonia on a Core–Shell‐Structured Au@CeO₂ Catalyst: Contribution of Oxygen Vacancies in CeO₂

Ru Nanoparticles Supported on Oxygen‐Deficient 3DOM BiVO₄: High‐Performance Catalysts for the Visible‐Light‐Driven Selective Oxidation of Benzyl Alcohol

Contact Info

Product

Resources

About

Optimization of plasmon-induced photocatalysis in electrospun Au/CeO 2 hybrid nanofibers for selective oxidation of benzyl alcohol

Cited by 99 publications

References 48 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

Ambient Electrosynthesis of Ammonia on a Core–Shell‐Structured Au@CeO2 Catalyst: Contribution of Oxygen Vacancies in CeO2

Ru Nanoparticles Supported on Oxygen‐Deficient 3DOM BiVO4: High‐Performance Catalysts for the Visible‐Light‐Driven Selective Oxidation of Benzyl Alcohol

Contact Info

Product

Resources

About

Ambient Electrosynthesis of Ammonia on a Core–Shell‐Structured Au@CeO₂ Catalyst: Contribution of Oxygen Vacancies in CeO₂

Ru Nanoparticles Supported on Oxygen‐Deficient 3DOM BiVO₄: High‐Performance Catalysts for the Visible‐Light‐Driven Selective Oxidation of Benzyl Alcohol