2020
DOI: 10.1007/s12274-020-2806-9
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Facile synthesis of Au embedded CuOx-CeO2 core/shell nanospheres as highly reactive and sinter-resistant catalysts for catalytic hydrogenation of p-nitrophenol

Abstract: Exploring cost-effective catalysts with high catalytic performance and long-term stability has always been a general concern for environment protection and energy conversion. Here, Au nanoparticles (NPs) embedded CuO x-CeO 2 core/shell nanospheres (Au@CuO x-CeO 2 CSNs) have been successfully prepared through a versatile one-pot method at ambient conditions. The spontaneous auto-redox reaction between HAuCl 4 and Ce(OH) 3 in aqueous solution triggered the self-assembly growth of micro-/ nanostructural Au@CuO x-… Show more

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Cited by 47 publications
(18 citation statements)
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“…4a). 8,27,29 The reaction rate almost follows pseudo-rst-order kinetics agreeing with the Langmuir-Hinshelwood mechanism; in which two reactants react aer adsorption on the solid surface, and then the product desorbs. The rate constant (k) was determined from the plot of ln(A/A 0 ) vs. time (Fig.…”
supporting
confidence: 60%
See 1 more Smart Citation
“…4a). 8,27,29 The reaction rate almost follows pseudo-rst-order kinetics agreeing with the Langmuir-Hinshelwood mechanism; in which two reactants react aer adsorption on the solid surface, and then the product desorbs. The rate constant (k) was determined from the plot of ln(A/A 0 ) vs. time (Fig.…”
supporting
confidence: 60%
“…4b) according to the previous reports. 7,8,28,29 The k value of 0.0134 min À1 (activity factor ¼ 0.1 s À1 g À1 ) is lower than previously reported PVP-coated bismuth nanodots (6.033 s À1 g À1 ) 8 and starch coated BiNPs (0.02751 s À1 ). 7 The lower catalytic rate of our BiNPs can be attributed to the electrostatic repulsion of 4-nitrophenolate ions with negatively charged BiNPs (zeta potential value ¼ À31.7 mV) in the reaction mixture.…”
mentioning
confidence: 55%
“…We have employed the Vienna Ab initio Simulation Package (VASP) [44] to carry out all DFT calculations within the generalized gradient approximation (GGA) using the Perdew‐Burke‐Ernzerhof (PBE) [45] functional. The GGA+U correction (U−J) was applied for Ce and Cu to be 4.5 and 4.0, respectively [46] . The projected augmented wave (PAW) potentials [47] were utilized to present the ionic cores and take valence electrons into account using a plane‐wave basis set with a kinetic energy cutoff of 400 eV.…”
Section: Methodsmentioning
confidence: 99%
“…As one of the most significant rare earth oxides with abundant reserves, cerium oxide (CeO 2 ) has attracted increasing attention owing to its high oxygen storage ability, reversible conversion from Ce 4+ to Ce 3+ , and inherently decent conductivity. , The (111) facet of CeO 2 is the most stable low index surface. , Ce 3+ appears in large quantities that can generate oxygen vacancies and also can adsorb oxygen. Therefore, it is easy to produce superoxide O 2 – on the surface of CeO 2 (111). At present, a few CeO 2 -based electrocatalysts have been reported for oxygen reduction, but the catalytic efficiency seems to be insufficient and the catalytic mechanism is still unclear . In recent years, the design and synthesis of hollow nanostructures have become important research fields in chemistry and materials science.…”
Section: Introductionmentioning
confidence: 99%