Fabrication of strawberry-like Au@CeO<sub>2</sub> nanoparticles with enhanced catalytic activity by assembly of block copolymer composite micelles

Jiao, Yapei; Li, Na; Huan, Yu; Li, Wenting; Zhao, Jinqi; Li, Xue; Zhang, Xiaokai

doi:10.1039/c6ra25500k

Cited by 10 publications

(3 citation statements)

References 56 publications

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“…Recently, Jiao et al have demonstrated the fabrication of strawberry-like Au–CeO 2 nanoparticles using PS– b –P2VP BCP micelles as templates, as schematically shown in Figure 6 a [ 26 ]. PS– b –P2VP/Ce(NO 3 ) 3 /HAuCl 4 composite micelles were prepared by dissolving PS– b –P2VP block copolymers, Ce(NO 3 ) 3 ·6H 2 O, and HAuCl 4 in a mixture of ethanol and toluene.…”

Section: Bcp Templates For Catalystsmentioning

confidence: 99%

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Block Copolymer Template-Directed Catalytic Systems: Recent Progress and Perspectives

et al. 2021

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Fabrication of block copolymer (BCP) template-assisted nano-catalysts has been a subject of immense interest in the field of catalysis and polymer chemistry for more than two decades now. Different methods, such as colloidal route, on-substrate methods, bulk self-assembly approaches, combined approaches, and many others have been used to prepare such nano-catalysts. The present review focuses on the advances made in this direction using diblock, triblock, and other types of BCP self-assembled structures. It will be shown how interestingly, researchers have exploited the features of tunable periodicity, domain orientation, and degree of lateral orders of self-assembled BCPs by using fundamental approaches, as well as using different combinations of simple methods to fabricate efficient catalysts. These approaches allow for fabricating catalysts that are used for the growth of single- and multi-walled carbon nanotubes (CNTs) on the substrate, size-dependent electrooxidation of the carbon mono oxide, cracking of 1,3,5-triisopropylbenzene (TIPB), methanol oxidation, formic acid oxidation, and for catalytic degradation of dyes and water pollutants, etc. The focus will also be on how efficient and ease-of-use catalysts can be fabricated using different BCP templates, and how these have contributed to the fabrication of different nano-catalysts, such as nanoparticle array catalysts, strawberry and Janus-like nanoparticles catalysts, mesoporous nanoparticles and film catalysts, gyroid-based bicontinuous catalysts, and hollow fiber membrane catalysts.

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Section: Bcp Templates For Catalystsmentioning

confidence: 99%

“…( b ) TEM image of Au–CeO 2 Janus particles, prepared using PS– b –PEO/Ce(NO 3 ) 3 /HAuCl 4 composite micelles underoptimized conditions. Adapted from [ 26 ]. ( c ) Schematic illustration of the process leading to the formation of Au–CeO 2 Janus-like nanoparticles using PS– b –PEO/Ce(NO 3 ) 3 /HAuCl 4 composite micelles.…”

Section: Figurementioning

confidence: 99%

Block Copolymer Template-Directed Catalytic Systems: Recent Progress and Perspectives

et al. 2021

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“…Many published reports have shown that CeO 2 NPs decorated with noble metal NPs contain an increased concentration of Ce 3+ and oxygen defects, thus promoting its superior performance for the above-mentioned applications. − Noble metal NPs undergo a facile charge-transfer interaction with the CeO 2 support. , The other benefit of using noble metals is to maximize visible photons absorption and accumulation by exploiting its surface plasmon resonance (SPR) properties . Because of the SPR effect, noble metal decorated CeO 2 displays excellent photocatalytic dye degradation and H 2 production. − Here, we have shown adsorption–photocatalysis synergy in removing methylene blue (MB) from water with citrate ( cit ) stabilized Au–CeO 2 at different Au NPs precursor concentrations. Colloidal Au NPs deliver comparatively weaker adsorption and photocatalytic performance.…”

Section: Introductionmentioning

confidence: 99%

Synergy of Adsorption and Plasmonic Photocatalysis in the Au–CeO₂ Nanosystem: Experimental Validation and Plasmonic Modeling

et al. 2022

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Adsorption-mediated water treatment leaves adsorbents as secondary pollutants in the environment. However, photocatalysis aids in decomposing the contaminant into its nontoxic forms. In this context, we demonstrate an adsorption−photocatalysis pairing in Au− CeO 2 nanocomposites for a total methylene blue (MB) removal from water. We synthesized Au−CeO 2 through the citrate (cit) reduction method at different Au loading and studied its adsorption capacity with kinetics and thermodynamic models. We observe that the high adsorption capacity of Au−CeO 2 is primarily because of the presence of Ce 3+ states in CeO 2 and citrate ligands on Au NPs. The Ce 3+ states interact and transfer their electrons to supported Au NPs, rendering a negative charge over Au. The negatively charged Au surface and the carboxyl (−COO − ) group of citrate ligands mediate an electrostatic interaction/adsorption of cationic MB. The total removal of MB is expedited under white light and lasers. A control experiment with Au NPs shows less adsorption−photocatalysis. The size of Au NPs and Au−CeO 2 interfacial interaction is responsible for the surface plasmon resonance spectral position at 550−600 nm. Linear sweep voltammetry (LSV) and plasmonic field simulation show surface plasmon-driven photocatalysis in Au−CeO 2 . LSV shows a 3-fold higher photocurrent density in Au− CeO 2 than colloidal Au NPs under white light. The simulated electric field intensity in Au−CeO 2 is maximum at SPR excitation and the closest interfacial separation (d = 0 nm). The plasmon-driven photocatalysis in colloidal Au NPs is mainly due to the interaction of hot electrons with the adsorbed MB molecule. Notably, near-field light concentration, hot electrons, and interfacial charge separation are responsible for excellent MB removal in the Au−CeO 2 nanosystem. The total MB removal through adsorption− photocatalysis pairing is 99.3% (Au−CeO 2 ), 30.7% (Au NPs), and 13% (CeO 2 ).

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Amperometric sensing of hydrazine in environmental and biological samples by using CeO2-encapsulated gold nanoparticles on reduced graphene oxide

Huang

Sun

et al. 2019

Microchim Acta

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Fabrication of strawberry-like Au@CeO₂ nanoparticles with enhanced catalytic activity by assembly of block copolymer composite micelles

Abstract: Novel strawberry-like Au@CeO2 nanoparticles, which show higher photocatalytic activity, were fabricated by assembly of block copolymer composite micelles via a redox reaction between Au(iii) and Ce(iii).

Cited by 10 publications

References 56 publications

Block Copolymer Template-Directed Catalytic Systems: Recent Progress and Perspectives

Block Copolymer Template-Directed Catalytic Systems: Recent Progress and Perspectives

Synergy of Adsorption and Plasmonic Photocatalysis in the Au–CeO₂ Nanosystem: Experimental Validation and Plasmonic Modeling

Amperometric sensing of hydrazine in environmental and biological samples by using CeO2-encapsulated gold nanoparticles on reduced graphene oxide

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Fabrication of strawberry-like Au@CeO2 nanoparticles with enhanced catalytic activity by assembly of block copolymer composite micelles

Abstract: Novel strawberry-like Au@CeO2 nanoparticles, which show higher photocatalytic activity, were fabricated by assembly of block copolymer composite micelles via a redox reaction between Au(iii) and Ce(iii).

Cited by 10 publications

References 56 publications

Block Copolymer Template-Directed Catalytic Systems: Recent Progress and Perspectives

Block Copolymer Template-Directed Catalytic Systems: Recent Progress and Perspectives

Synergy of Adsorption and Plasmonic Photocatalysis in the Au–CeO2 Nanosystem: Experimental Validation and Plasmonic Modeling

Amperometric sensing of hydrazine in environmental and biological samples by using CeO2-encapsulated gold nanoparticles on reduced graphene oxide

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Fabrication of strawberry-like Au@CeO₂ nanoparticles with enhanced catalytic activity by assembly of block copolymer composite micelles

Synergy of Adsorption and Plasmonic Photocatalysis in the Au–CeO₂ Nanosystem: Experimental Validation and Plasmonic Modeling