Hierarchical nanoscale multi-shell Au/CeO<sub>2</sub> hollow spheres

Xu, Pengfei; Yu, Ranbo; Ren, Hao; Zong, Lingbo; Xing, Xianran

doi:10.1039/c4sc01882f

Cited by 107 publications

(85 citation statements)

References 39 publications

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“…In our original work on the sequential templating approach, we demonstrated that the shell number of multishelled hollow metal oxide spheres is related to the concentration and penetration depth of metal ions within the carbonaceous templates and can be well adjusted by changing the concentration of metal salt solution during the adsorption process. 25,26,31,32,70,137,143,147,150,172 With the sequential templating approach, the size of the outer shell is mainly determined by that of templates adopted and could be well tuned to some extent, 179 while the sizes of inner shells are related to the forming conditions. Moreover additionally acid treatment on carbonaceous templates would result in the quadruple-shelled Co 3 O 4 microspheres ( Fig.…”

Section: Geometric Manipulation Of Multi-shelled Hollow Structure Matmentioning

confidence: 99%

Multi-shelled hollow micro-/nanostructures

et al. 2015

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Great progress has been made in the preparation and application of multi-shelled hollow micro-/nanostructures during the past decade. However, the synthetic methodologies and potential applications of these novel and interesting materials have not been reviewed comprehensively in the literature. In the current review we first describe different synthetic methodologies for multi-shelled hollow micro-/nanostructures as well as their compositional and geometric manipulation and then review their applications in energy conversion and storage, sensors, photocatalysis, and drug delivery. The correlation between the geometric properties of multi-shelled hollow micro-/nanostructures and their specific performance in relevant applications are highlighted. These results demonstrate that the geometry has a direct impact on the properties and potential applications of such materials. Finally, the emerging challenges and future development of multi-shelled hollow micro-/nanostructures are further discussed.

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Section: Geometric Manipulation Of Multi-shelled Hollow Structure Matmentioning

confidence: 99%

Multi-shelled hollow micro-/nanostructures

et al. 2015

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“…Yu et al 15 fabricated hollow spherical CeO 2 supported Au catalyst which showed high activity and a long lifetime in the catalytic reduction of p-nitrophenol because of the nanosized interconnected chambers of the hierarchical support resulting in the large specific surface area and narrow mesopore distribution. Preparing micro-level hierarchical materials is considered as an effective way to solve this problem.…”

Section: Introductionmentioning

confidence: 99%

Flower-like Au/Ni–Al hydrotalcite with hierarchical pore structure as a multifunctional catalyst for catalytic oxidation of alcohol

Jin

Feng

et al. 2015

Catal. Sci. Technol.

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Flower-like hierarchical Au/NiAl-LDH catalysts were synthesized for selective oxidation of alcohols. Abundant hydrogen vacancies at the edge of flowers as the nucleation center made contributions for the uniform dispersion of AuNPs. The confinement effect of the hierarchical pores promoted 60% higher activity than the common Au/NiAl-LDH nanoparticle catalyst in the oxidation of benzyl alcohol by heightening the effective collisions between substrates and active sites. The evolution process of hierarchical pores in support was further proposed. Moreover, the reaction mechanism of the cooperation among Brønsted base sites, Ni III coordinatively unsaturated metal sites and isolated gold cations was concretely proved. In the oxidation of other typical alcoholic substrates, the flower-like catalyst kept higher activity than the common nanoparticle one except for linear alcohols, which could be attributed to the shape selectivity of straight macro-pores.

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“…Recently, extensive research efforts have been devoted to design and fabricate complex hollow structures with multi-shelled architecture and tunable chemical composition, which are expected to realize their optimized physical/chemical properties for specific applications. Until now, many types of metal oxides with multi-shelled structures have been successfully fabricated based on soft-or hard-template methods [20][21][22][23][24][25] . For example, Lou et al 26,27 have previously fabricated double-shelled SnO 2 hollow spheres using silica spheres as templates combining with designed procedures.…”

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Formation of nickel cobalt sulfide ball-in-ball hollow spheres with enhanced electrochemical pseudocapacitive properties

et al. 2015

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While the synthesis of hollow structures of transition metal oxides is well established, it is extremely challenging to fabricate complex hollow structures for mixed transition metal sulfides. Here we report an anion exchange method to synthesize a complex ternary metal sulfides hollow structure, namely nickel cobalt sulfide ball-in-ball hollow spheres. Uniform nickel cobalt glycerate solid spheres are first synthesized as the precursor and subsequently chemically transformed into nickel cobalt sulfide ball-in-ball hollow spheres. When used as electrode materials for electrochemical capacitors, these nickel cobalt sulfide hollow spheres deliver a specific capacitance of 1,036 F g À 1 at a current density of 1.0 A g À 1 . An asymmetric supercapacitor based on these ball-in-ball structures shows long-term cycling performance with a high energy density of 42.3 Wh kg À 1 at a power density of 476 W kg À 1 , suggesting their potential application in high-performance electrochemical capacitors.

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Hierarchical nanoscale multi-shell Au/CeO₂ hollow spheres

Abstract: Hierarchical nanoscale multi-shell Au/CeO2 hollow spheres with interconnected nanochambers and high catalytic activity were synthesized using a controllable approach.

Cited by 107 publications

References 39 publications

Multi-shelled hollow micro-/nanostructures

Multi-shelled hollow micro-/nanostructures

Flower-like Au/Ni–Al hydrotalcite with hierarchical pore structure as a multifunctional catalyst for catalytic oxidation of alcohol

Formation of nickel cobalt sulfide ball-in-ball hollow spheres with enhanced electrochemical pseudocapacitive properties

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