Thickness-tunable core–shell Co@Pt nanoparticles encapsulated in sandwich-like carbon sheets as an enhanced electrocatalyst for the oxygen reduction reaction

Xiang, Tao; Fang, Ling; Wan, Jing; Liu, Li; Gao, Jianjun; Xu, Hai Tao; Zhang, Hui Juan; Gu, Xiao; Wang, Yu

doi:10.1039/c8ta05114c

Cited by 23 publications

(12 citation statements)

References 43 publications

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“…6: 182135 magnetization and greater magnetocrystallinity make Co an ideal core material for hybrid nanostructures. Various nanocomposite materials including core-shell structures have been reported using Co as the core material, for example, cobalt -gold (Co@Au), cobalt -copper (Co@Cu), cobalt -platinum (Co@Pt) and cobalt -silver (Co@Ag) nanoparticles [25][26][27]. The prominent advantages of using Co as a core material with other non-ferromagnetic materials such as Ag, Au and Cu include giant magnetoresistance (GMR) and high stability even at higher temperatures, which are desirable properties in multifunctional sensing, media recording and wideband photovoltaic solar cell applications [28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of silver nanoparticle-decorated cobalt nanocomposites (Co@AgNPs) and their density-dependent antibacterial activity

et al. 2019

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Magnetic cores loaded with metallic nanoparticles can be promising nano-carriers for successful drug delivery at infectious sites. We report fabrication, characteristic analysis and in vitro antibacterial performance of nanocomposites comprising cobalt cores (Co-cores) functionalized with a varied concentration of silver nanoparticles (AgNPs). A two-step polyol process synchronized with the transmetalation reduction method was used. Co-cores were synthesized with cobalt acetate, and decoration of AgNPs was carried out with silver acetate. The density of AgNPs was varied by changing the amount of silver content as 0.01, 0.1 and 0.2 g in the synthesis solution. Both AgNPs and Co-cores were spherical having a size range of 30–80 nm and 200 nm to more than 1 µm, respectively, as determined by scanning electron microscopy. The metallic nature and face-centred cubic crystalline phase of prepared nanocomposites were confirmed by X-ray diffraction. Biocompatibility analysis confirmed high cell viability of MCF7 at low concentrations of tested particles. The antibacterial performance of nanocomposites (Co@AgNPs) against Escherichia coli and Bacillus subtilis was found to be AgNPs density-dependent, and nanocomposites with the highest AgNPs density exhibited the maximum bactericidal efficacy. We therefore propose that Co@AgNPs as effective drug containers for various biomedical applications.

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Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of silver nanoparticle-decorated cobalt nanocomposites (Co@AgNPs) and their density-dependent antibacterial activity

et al. 2019

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“…The preparation of Co−Pt NPs with alloy and core−shell structures is possible through the control of Co concentration using the proposed synthesis technique. Controlling of Pt ion and Co ion reduction timing by the Pt−OAm complex and the injection method via alcohol reduction, respectively, the designed synthesis of the Co−Pt core−shell nanoparticle, which possessed higher magnetic properties than any previous reports, [34][35][36][37][38]54 has been achieved. The formation of the core− shell structure is appreciable due to the following advantages: (a) the formation of a Co-rich core could lead to an increase in the magnetization compared to disordered Co−Pt alloy, and (b) the presence of Pt on the surface of the NPs could facilitate Au coating by reducing the lattice mismatch.…”

Section: Acs Applied Nano Materialsmentioning

confidence: 94%

“…Aiming to address the problems discussed above, we propose the use of a Co–Pt alloy as a magnetic core, which is more stable during synthesis and under oxidizing atmosphere than Fe and possesses reasonably high saturation magnetization (e.g., CoPt (Co 50 Pt 50 ) = 28 emu/g) . CoPt NPs have been already considered for magnetic recording and catalyst applications. − In most cases, CoPt NPs have been synthesized using the thermal decomposition technique, which lacked size, shape, and composition control. Here, the alcohol reduction method, which is a nonaqueous solution process using 1-octanol as the solvent, and the reducing agent are used for the synthesis of CoPt nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Magneto-Plasmonic Co@Pt@Au Nanocrystals for Biosensing and Therapeutics

Katagiri

Huaman

Matsumoto

et al. 2019

ACS Appl. Nano Mater.

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Multifunctional nanoparticles (NPs) exhibiting high magnetic property and plasmonic resonance are expected to be advanced nanomaterials which enable therapy, detection, and diagnosis simultaneously for medical applications. To achieve the practical performance of the multifunctional NPs, the precise design and synthesis are both required. In this work, considering the chemical stability and controllability, Co−Pt@Au core−shell NPs, which exhibit high magnetic property and plasmonic resonance, were theoretically designed based on calculation and then experimentally synthesized using an alcohol reduction method. Co−Pt NPs were uniformly synthesized using a technique which enables reduction control of Pt through the formation of a Pt−oleylamine complex. Moreover, depending on the Co/Pt ratio, the distribution of Co and Pt in a nanoparticle was precisely controlled, and as a result, Co−Pt alloy and Co@Pt core−shell NPs were individually prepared. In particular, Co@Pt NPs exhibit a high magnetic property and are suitable for Au coating due to a small lattice mismatch. In fact, Au coating onto Co@Pt NPs was successfully performed via inhomogeneous nucleation, which results in Co@Pt@Au NPs exhibiting plasmonic response of Au with high magnetic property and being dispersed in water by ligand exchange for in vivo use. The developed synthetic method enables designed synthesis of complicated multicomponent nanoparticles through tunable reduction reaction and provides highly potential NPs for transport and sensing applications.

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“…Nonprecious metals have attracted enormous interest because of their beneficial strain and ligand effects. So far, core–shell architectures have been fabricated in Fe@Pt, , Fe@Ru, Co@Pt, ,,,,,− Co@Pd, Co@Ir, Co@Au, Ni@Pt, ,,− Ni@Pd, ,,,− Ni@Ru, Cu@Pt, ,,− Cu@Pd, ,, Cu@Ag, Mo@Pd, W@Pd, and so on. However, such core–shell nanoparticles suffer from a more serious leaching problem than dealloyed core–shell catalysts do.…”

Section: Core–shell Electrocatalystsmentioning

confidence: 99%

Recent Advances in Earth-Abundant Core/Noble-Metal Shell Nanoparticles for Electrocatalysis

2020

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Electrocatalysis plays a central role in the development of clean energy technologies. The core–shell nanoparticle, which comprises a thin layer of catalytically active shell over a subsurface core, represents an important class of electrocatalysts. Although the internal core does not participate directly in catalysis, it influences the properties of the shell in terms of activity and stability. Furthermore, the usage of platinum-group metals (PGMs) can be greatly reduced when earth-abundant elements serve as the core materials. Thanks to these advantages, core–shell nanoparticles have attracted ever-increasing research interest. In this Perspective, we focus on recent advances of core–shell electrocatalysts constituted by earth-abundant cores and noble-metal shells. We start by discussing the factors that can influence the electrocatalytic properties of core–shell nanoparticles and move on to briefly summarize their synthetic strategies. We further discuss the core–shell electrocatalysts in terms of different core materials (low-PGM alloys, nonprecious metals, nitrides, carbides, and oxides) and showcase their electrocatalytic properties in reactions involved in water electrolysis and fuel cells. We conclude by discussing the general trends and challenges in this field.

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Thickness-tunable core–shell Co@Pt nanoparticles encapsulated in sandwich-like carbon sheets as an enhanced electrocatalyst for the oxygen reduction reaction

Abstract: Two-dimensional sandwich-like Co/C samples with a series of different thicknesses of Pt layers have been developed for oxygen reduction reaction.

Cited by 23 publications

References 43 publications

Synthesis and characterization of silver nanoparticle-decorated cobalt nanocomposites (Co@AgNPs) and their density-dependent antibacterial activity

Synthesis and characterization of silver nanoparticle-decorated cobalt nanocomposites (Co@AgNPs) and their density-dependent antibacterial activity

Magneto-Plasmonic Co@Pt@Au Nanocrystals for Biosensing and Therapeutics

Recent Advances in Earth-Abundant Core/Noble-Metal Shell Nanoparticles for Electrocatalysis

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