Diffusion through the Shells of Yolk–Shell and Core–Shell Nanostructures in the Liquid Phase

Liang, Xiaoliang; Li, Jie; Joo, Ji Bong; Gutiérrez, Alejandro; Tillekaratne, Aashani; Lee, Ilkeun; Yin, Yadong; Zaera, Francisco

doi:10.1002/anie.201203456

Cited by 73 publications

(55 citation statements)

References 36 publications

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“…However, preparation of non-siliceous porous oxide shells is still challenging, because the calcination process for crystallization causes the loss of porosity. For the creation of high crystalline oxide shells, an alternative method was developed by silica-protected calcinations [24,27]. Figure 3b shows Pt/TiO 2 core/shell structures synthesized by the growth of a TiO 2 layer on top of the given Pt/SiO 2 core/ shells.…”

Section: Core/shell Nanoparticlesmentioning

confidence: 99%

Nanocatalysis I: Synthesis of Metal and Bimetallic Nanoparticles and Porous Oxides and Their Catalytic Reaction Studies

Somorjai

2014

Catal Lett

132

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In recent heterogeneous catalysis, much effort has been made in understanding how the size, shape, and composition of nanoparticles and oxide-metal interfaces affect catalytic performance at the molecular level. Recent advances in colloidal synthetic techniques enable preparing diverse metallic or bimetallic nanoparticles with welldefined size, shape, and composition and porous oxides as a high surface support. As nanoparticles become smaller, new chemical, physical, and catalytic properties emerge. Geometrically, as the smaller the nanoparticle the greater the relative number of edge and corner sites per unit surface of the nanoparticle. When the nanoparticles are smaller than a critical size (2.7 nm), finite-size effects such as a change of adsorption strength or oxidation state are revealed by changes in their electronic structures. By alloying two metals, the formation of heteroatom bonds and geometric effects such as strain due to the change of metal-metal bond lengths cause new electronic structures to appear in bimetallic nanoparticles. Ceaseless catalytic reaction studies have been discovered that the highest reaction yields, product selectivity, and process stability were achieved by determining the critical size, shape, and composition of nanoparticles and by choosing the appropriate oxide support. Depending on the pore size, various kinds of micro-, meso-, and macro-porous materials are fabricated by the aid of structure-directing agents or hardtemplates. Recent achievements for the preparation of versatile core/shell nanostructures composing mesoporous oxides, zeolites, and metal organic frameworks provide new insights toward nanocatalysis with novel ideas.

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Section: Core/shell Nanoparticlesmentioning

confidence: 99%

Nanocatalysis I: Synthesis of Metal and Bimetallic Nanoparticles and Porous Oxides and Their Catalytic Reaction Studies

Somorjai

2014

Catal Lett

132

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“…To this end, core-shell 74 nanostructures have been very widely studied in the production of functional 75 nanomaterials, including those for biomedical applications [4][5][6]. [19][20][21][22].…”

Section: Introduction 71mentioning

confidence: 99%

Electrospun pH-sensitive core–shell polymer nanocomposites fabricated using a tri-axial process

et al. 2016

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“…6 Also when the cavity is not hosting any active species, it is generally believed that it may improve the diffusion of reactants and products through the catalyst bed or electrode. 7,8 The second component, the mesoporous shell, can play an important role by acting as a physical separation between the nano-reactors and thus improving the catalyst stability, [9][10][11] but it can also be used to encapsulate metallic nanoparticles. 12,13 Hence, the functional multiplicity of HMCS makes such structures a very versatile platform for many applications.…”

Section: Introductionmentioning

confidence: 99%

General Method for the Synthesis of Hollow Mesoporous Carbon Spheres with Tunable Textural Properties

Mezzavilla

Baldizzone

Mayrhofer

et al. 2015

ACS Appl. Mater. Interfaces

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A versatile synthetic procedure to prepare hollow mesoporous carbon spheres (HMCS) is presented here. This approach is based on the deposition of a homogeneous hybrid polymer/silica composite shell on the outer surface of silica spheres through the surfactant-assisted simultaneous polycondensation of silica and polymer precursors in a colloidal suspension. Such composite materials can be further processed to give hollow mesoporous carbon spheres. The flexibility of this method allows for independent control of the morphological (i.e., core diameter and shell thickness) and textural features of the carbon spheres. In particular, it is demonstrated that the size of the pores within the mesoporous shell can be precisely tailored over an extended range (2-20 nm) by simply adjusting the reaction conditions. In a similar fashion, also the specific carbon surface area as well as the total shell porosity can be tuned. Most importantly, the textural features can be adjusted without affecting the dimension or the morphology of the spheres. The possibility to directly modify the shell textural properties by varying the synthetic parameters in a scalable process represents a distinct asset over the multistep hard-templating (nanocasting) routes. As an exemplary application, Pt nanoparticles were encapsulated in the mesoporous shell of HMCS. The resulting Pt@HMCS catalyst showed an enhanced stability during the oxygen reduction reaction, one of the most important reactions in electrocatalysis. This new synthetic procedure could allow the expansion, perhaps even beyond the lab-scale, of advanced carbon nanostructured supports for applications in catalysis.

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Diffusion through the Shells of Yolk–Shell and Core–Shell Nanostructures in the Liquid Phase

Cited by 73 publications

References 36 publications

Nanocatalysis I: Synthesis of Metal and Bimetallic Nanoparticles and Porous Oxides and Their Catalytic Reaction Studies

Nanocatalysis I: Synthesis of Metal and Bimetallic Nanoparticles and Porous Oxides and Their Catalytic Reaction Studies

Electrospun pH-sensitive core–shell polymer nanocomposites fabricated using a tri-axial process

General Method for the Synthesis of Hollow Mesoporous Carbon Spheres with Tunable Textural Properties

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