Multishell hollow CeO2/CuO microbox catalysts for preferential CO oxidation in H2-rich stream

Gao, Meiyi; Zhao, Yonggang; Zeng, Shanghong; Su, Haiquan

doi:10.1016/j.catcom.2015.09.022

Cited by 13 publications

(4 citation statements)

References 26 publications

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“…[38] 2) Hollow spheres, on the other hand, are usually microspheres with centric void composed of nanocrystals with size of a few nanometers. Hollow box, [45][46][47] hollow cubes, [48] hollow dodecahedrons, [49] and hollow cages [50] are fabricated to achieve the combination of orientability and symmetry. [41,42] 4) And multishelled spheres are sets of concentric shells with shrinking diameter placed one inside another.…”

Section: General Strategy For Synthesizing Ceo 2 Hollow Micro/nanostrmentioning

confidence: 99%

“…Hollow polyhedrons (nanobox) CeO 2 Hard template 1) Preparation of Cu 2 O cubes; 2) removal of template by coordinating etching; 3) thermal annealing [70] Pt/CeO 2 Galvanic replacement 1) Preparation of Cu 2 O nanocubes; 2) redox reaction between Cu + and Ce 4+ [46] Multishelled box CeO 2 /CuO Hard templates 1) Preparation of CuO template 2) incipient wetness method; 3) calcination [45] Nanocage CeO 2 −ZrO 2 Solid Solution Kirkendall effect 1) Preparation of CeO 2 clusters as templates; 2) adding ZrOCl 2 solution; hydrothermal treatment [50] Hollow nanobeads CeO 2 Hard templates 1) Particle growth under solvothermal treatment; 2) calcination removal of carbon nanotubes [151b] www.advmat.de www.advancedsciencenews.com…”

Section: General Strategy For Synthesizing Ceo 2 Hollow Micro/nanostrmentioning

confidence: 99%

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Hollow Micro/Nanostructured Ceria‐Based Materials: Synthetic Strategies and Versatile Applications

Wang

2018

Advanced Materials

108

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Hollow micro/nanostructured CeO2‐based materials (HMNCMs) have triggered intensive attention as a result of their unique structural traits, which arise from their hollowness and the fascinating physicochemical properties of CeO2. This attention has led to widespread applications with improved performance. Herein, a comprehensive overview of methodologies applied for the synthesis of various hollow structures, such as hollow spheres, nanotubes, nanoboxes, and multishelled hollow spheres, is provided. The synthetic strategies toward CeO2 hollow structures are classified into three major categories: 1) well‐established template‐assisted (hard‐, soft‐, and in situ template) methods; 2) newly emerging self‐template approaches, including selective etching, Ostwald ripening, the Kirkendall effect, galvanic replacement, etc.; 3) bottom‐up self‐organized formation synthesis (namely, oriented attachment and self‐deformation). Their underlying mechanisms are concisely described and discussed in detail, the differences and similarities of which are compared transversely and longitudinally. Niche applications of HMNCMs in a wide range of fields including catalysis, energy conversion and storage, sensors, absorbents, photoluminescence, and biomedicines are reviewed. Finally, an outlook of future opportunities and challenges in the synthesis and application of CeO2‐based hollow structures is also presented.

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Section: General Strategy For Synthesizing Ceo 2 Hollow Micro/nanostrmentioning

confidence: 99%

Section: General Strategy For Synthesizing Ceo 2 Hollow Micro/nanostrmentioning

confidence: 99%

Hollow Micro/Nanostructured Ceria‐Based Materials: Synthetic Strategies and Versatile Applications

Wang

2018

Advanced Materials

108

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“…Through precise manipulation of precursor enrichment and product conversion during the fabrication process, the compositional and geometrical features of HoMSs can be accurately controlled. As a result, HoMSs with various compositions (oxide, sulfide, carbonate, phosphide, vanadate, or nonmetallic), shapes (sphere, tubes, cubes, polyhedra), building subunits (nanoparticles, nanorods, nanoflakes), and shell architectures (shell number, shell thickness, intershell space, shell porosity) have been developed. − Benefiting from the booming development in HoMSs fabrication, HoMSs have been applied for a wide variety of application areas, achieving remarkable application performance. However, the understanding of the structure–performance correlation is still insufficient, which inevitably slows down the further development and application of HoMSs.…”

Section: Introductionmentioning

confidence: 99%

Hollow Multishelled Structures for Promising Applications: Understanding the Structure–Performance Correlation

2019

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Conspectus The unique structural features of hollow multishelled structures (HoMSs) endow them with abundant beneficial physicochemical properties including high surface-to-volume ratio, low density, short mass transport length, and high loading capacity. As a result, HoMSs have been considered as promising candidates for various application areas including energy storage, electromagnetic wave (EW) absorption, catalysis, sensors, drug delivery, etc. However, for a long time, the general and controllable synthesis of HoMSs has remained a great challenge using conventional soft-templating or hierarchical self-assembly methods, which severely limits the development of HoMSs. Fortunately, the sequential templating approach (STA), which was first reported by our group and further developed by others, has been proven to be a versatile method for HoMS fabrication. By using the STA and through accurate physical and chemical manipulation of the synthesis conditions, the diversity of the HoMS family has been enriched in both compositional and geometrical aspects. Benefiting from the flourishing of synthetic methodology, various HoMSs have been fabricated and showed application prospect in diverse areas. However, the structure–performance correlation remained obscure, which hinders the design of optimal HoMSs to achieve the best application performance. This Account aims to explore the correlation between HoMS structural characteristics and their application performance. We first briefly summarize the achievements in the compositional and geometrical manipulation of HoMSs by physically and chemically tuning the synthesis process. Then, we systematically discuss the effect of structural engineering on optimizing performance in various application areas, especially for energy storage, EW absorption, catalysis, sensors, and drug delivery. Specifically, HoMSs with multiple thin shells can provide numerous active sites for energy storage, leading to a higher volumetric energy density than their single-shelled counterparts. The high shell porosity permits electrolyte access to the interior of HoMSs, along with shortened mass transport path through the thin shells, resulting in a high power density. The adequate inner cavity effectively buffers the ion-insertion strain, leading to prolonged cycling stability. For EW absorption, HoMSs with high surface-to-volume ratio can provide many sites for EW-sensitive material loading. The multiple separated shells with small intershell space enable multiple EW reflection and scattering, thus improving EW absorption efficiency. For catalysis and sensors, the increased reaction sites along with the facilitated transport of reactants and products can enhance the activity and sensitivity. The selectivity can be improved by optimizing the pore structure and hydrophobic or hydrophilic properties of the shells. Also the stability is improved with inner shells being protected by exterior ones. For drug delivery, the increased exposed sites and the inner cavity improve the drug loading capacity. The ...

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“…To improve the advantages of the hollow structure, multishell hollow-structured materials have recently been considered to be a promising structure owning to their unique properties, such as large surface area, multiple components, and outstanding light-scattering effect [28][29][30][31]. The light scattering was enhanced through repeated reflection and scattering events between the inner and outer shells in the multishell structure.…”

Section: Introductionmentioning

confidence: 99%

Controllable Architecture of Mesoporous Double-Nanoshell SiO2/TiO2 Hollow Tube Based on Layer by Layer Method

Chen

Zhang

et al. 2021

Journal of Nanomaterials

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Double-shell tubular on-dimensional structure can be fabricated through a layer by layer method, in which the core template was removed to create the tubular shape. In this paper, we report, for the first time, the double nanoshell SiO2/TiO2 hollow tubes prepared through a layer-by-layer deposition method involving the sol-gel process for the SiO2 and TiO2 generation. During TEOS and TEOT hydrolysis/condensation for the SiO2 and TiO2 shell layer formation, cetyltrimethylammonium bromide (CTAB) is adopted both as the structure-directing template and as the mesopore-channel template distributing around the shell. The obtained double-nanoshell hollow tubes illustrate a large surface area and high pore volume. Also, mesoporous double-nanoshell SiO2/TiO2 hollow tubes have the inner and outer shell thickness of about 80 nm and 120 nm, respectively. Plus, the shell thickness of SiO2 and TiO2 is controllable depending on the used concentration of TEOS and TEOT during their sol-gel process. Therefore, the technique for the preparation of SiO2/TiO2 mesoporous double-nanoshell hollow tubes could provide new insights into the construction of mesoporous double-shell and hollow structure for other multicomponent and hierarchical hybrid systems.

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Multishell hollow CeO2/CuO microbox catalysts for preferential CO oxidation in H2-rich stream

Cited by 13 publications

References 26 publications

Hollow Micro/Nanostructured Ceria‐Based Materials: Synthetic Strategies and Versatile Applications

Hollow Micro/Nanostructured Ceria‐Based Materials: Synthetic Strategies and Versatile Applications

Hollow Multishelled Structures for Promising Applications: Understanding the Structure–Performance Correlation

Controllable Architecture of Mesoporous Double-Nanoshell SiO2/TiO2 Hollow Tube Based on Layer by Layer Method

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