Highly Active Nanoreactors: Nanomaterial Encapsulation Based on Confined Catalysis

Sanlés‐Sobrido, Marcos; Pérez‐Lorenzo, Moisés; Rodríguez‐González, Benito; Salgueiriño, Verónica; Correa‐Duarte, Miguel A.

doi:10.1002/anie.201105283

Cited by 100 publications

(88 citation statements)

References 53 publications

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“…From the totally different morphologies even through the essentially same synthesis process, the RGO/CNT structure can be regarded as a critical role in forming the V 2 O 5 microsphere. A local interspace confined by RGO and CNT can be a reason for the assembly structure because the V 2 O 5 nanoparticles in the local interspace grow into microsphere via an Ostwald ripening process29. Figure 1d,e present the morphology of 3D V 2 O 5 /RGO/CNT composite with the ratio of RGO to CNT at 1:2 and 2:1, respectively.…”

Section: Resultsmentioning

confidence: 98%

Porous V2O5/RGO/CNT hierarchical architecture as a cathode material: Emphasis on the contribution of surface lithium storage

Palanisamy

Jeong

et al. 2016

Sci Rep

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A three dimensional vanadium pentoxide/reduced graphene oxide/carbon nanotube (3D V2O5/RGO/CNT) composite is synthesized by microwave-assisted hydrothermal method. The combination of 2D RGO and 1D CNT establishes continuous 3D conductive network, and most notably, the 1D CNT is designed to form hierarchically porous structure by penetrating into V2O5 microsphere assembly constituted of numerous V2O5 nanoparticles. The highly porous V2O5 microsphere enhances electrolyte contact and shortens Li+ diffusion path as a consequence of its developed surface area and mesoporosity. The successive phase transformations of 3D V2O5/RGO/CNT from α-phase to ε-, δ-, γ-, and ω-phase and its structural reversibility upon Li+ intercalation/de-intercalation are investigated by in situ XRD analysis, and the electronic and local structure reversibility around vanadium atom in 3D V2O5/RGO/CNT is observed by in situ XANES analysis. The 3D V2O5/RGO/CNT achieves a high capacity of 220 mAh g−1 at 1 C after 80 cycles and an excellent rate capability of 100 mAh g−1 even at a considerably high rate of 20 C. The porous 3D V2O5/RGO/CNT structure not only provides facile Li+ diffusion into bulk but contributes to surface Li+ storage as well, which enables the design of 3D V2O5/RGO/CNT composite to become a promising cathode architecture for high performance LIBs.

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Section: Resultsmentioning

confidence: 98%

Porous V2O5/RGO/CNT hierarchical architecture as a cathode material: Emphasis on the contribution of surface lithium storage

Palanisamy

Jeong

et al. 2016

Sci Rep

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“…The synthetic strategy followed in this work is based on previously reported approach [20,21] although several modifications have been performed to improve the optical properties (detailed in the Experimental Section). The effective control over the NPs growth and consequently the average NP interdistance was facilitated by the immobilization of the Au NPs used as seeds into the inner walls of the silica capsules.…”

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confidence: 99%

Tunable Black Gold: Controlling the Near‐Field Coupling of Immobilized Au Nanoparticles Embedded in Mesoporous Silica Capsules

ElKabbash

Sousa‐Castillo

Nguyen

et al. 2017

Advanced Optical Materials

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Increasing the efficiency and cost effectiveness of solar energy generators allowed them to compete with traditional carbonbased energy sources in many energy markets worldwide. However, a major problem facing the proliferation of solar energy generation is energy storage. On one hand, photovoltaic generators enjoy relatively high efficiency but suffer from high electric energy storage costs. On the other hand, concentrated solar power plants collect and store heat and dispatch electricity at lower storage costs but with less efficiency compared to photovoltaics. To address these problems, hybrid solar converters were proposed to optimally exploit the high efficiency of photovoltaics and low costs of solar energy storage. [1] To realize such Efficient light-to-heat conversion is central for various applications such as thermo-photovoltaics and solar steam generation. Although metals can strongly absorb light and generate heat, their free electrons shield the electric field before any substantial penetration in the metal. Excitation of surface plasmons can suppress metal reflection and convert it into a black metal, for example, black gold. In this work, mesoporous silica capsules grafted with immobilized Au nanoparticles (NPs) with different sizes via controlled chemical synthesis are synthesized. It is shown that changing the size of immobilized NPs modifies the interparticle coupling strength, thus, modifying the NPs absorption. The broadness of the plasmon resonance is tuned across the visible, near-infrared, and short wavelength infrared regions. The ability to control the broadness of black gold absorption is not possible in other systems based on bottom-up synthesis. The proposed approach broadens the possibilities of utilizing black gold in many applications such as thermo-photovoltaics, and solar energy harvesting especially in hybrid solar converters.

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“…Among diverse particle geometries, hollow capsules have recently received more attention. This interest is primarily fueled up due to their ability to confine the chemicals within their hollow cavities and their controlled release3435, to serve as highly active nanoreactors36 and to keep metal nanoparticle catalysts isolated and avoid their ripening37 or poisoning38. In this regard, fabrication of hollow microporous organic capsules (HMOCs) could be very useful to broaden the scope of MOPs.…”

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confidence: 99%

Hollow Microporous Organic Capsules

Yang

Xia

et al. 2013

Sci Rep

111

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Fabrication of hollow microporous organic capsules (HMOCs) could be very useful because of their hollow and porous morphology, which combines the advantages of both microporous organic polymers and non-porous nanocapsules. They can be used as storage materials or reaction chambers while supplying the necessary path for the design of controlled uptake/release systems. Herein, the synthesis of HMOCs with high surface area through facile emulsion polymerization and hypercrosslinking reactions, is described. Due to their tailored porous structure, these capsules possessed high drug loading efficiency, zero-order drug release kinetics and are also demonstrated to be used as nanoscale reactors for the prepareation of nanoparticles (NPs) without any external stabilizer. Moreover, owing to their intrinsic biocompatibility and fluorescence, these capsules exhibit promising prospect for biomedical applications.

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Highly Active Nanoreactors: Nanomaterial Encapsulation Based on Confined Catalysis

Cited by 100 publications

References 53 publications

Porous V2O5/RGO/CNT hierarchical architecture as a cathode material: Emphasis on the contribution of surface lithium storage

Porous V2O5/RGO/CNT hierarchical architecture as a cathode material: Emphasis on the contribution of surface lithium storage

Tunable Black Gold: Controlling the Near‐Field Coupling of Immobilized Au Nanoparticles Embedded in Mesoporous Silica Capsules

Hollow Microporous Organic Capsules

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