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This work reports the preparation of N-doped carbon confined NiCo alloy hollow spheres (NiCo@N-C HS) as bifunctional oxygen electrocatalyst for Zn-air battery with a higher energy density (788.7 mWh gZn-1) and outstanding cycling stability (over 200 h), which are more durable than the commercialized Pt/C+RuO2-based device.
Hollow carbon spheres (HCS) manifest specific merit in achieving large interior void space, high permeability, wide contactable area, and strong stacking ability …
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We prepared porous Fe-doped nickel cobaltate (Fe-NiCo2O4) hollow hierarchical nanospheres through a facile self-templated synthetic strategy. Due to the porous hollow structure and composition, the Fe-NiCo2O4 presented vastly superior electrocatalytic activity for the oxygen evolution reaction (OER), compared with NiCo2O4 …
The synthesis of 2,5-dimethylfuran (DMF) from 5-hydroxymethylfurfural (HMF) is a highly attractive route to a renewable fuel. However, achieving high yields in this reaction is a substantial ...
We report engineered hollow core–shell interlinked carbon spheres that consist of a mesoporous shell, a hollow void, and an anchored carbon core and are expected to be ideal sulfur hosts for overcoming the shortage of Li–S batteries. The hollow core–shell interlinked carbon spheres were obtained through solution synthesis of …
Abstract. Hollow carbon spheres (HCSs) have attracted tremendous interest in recent years due to their intriguing structure-induced physicochemical properties and …
Constructing unique and highly stable structures with plenty of electroactive sites in sodium storage materials is a key factor for achieving improved electrochemical properties through favorable sodium ion diffusion kinetics. An SnS2@carbon hollow nanospheres (SnS2@C) has been designed and fabricated via a facile solvothermal …
To solve the above-mentioned problems, a well-designed hollow carbon sphere framework with embedded Fe 3 O 4 nanoparticles (S/Fe 3 O 4-NC) is reported here as an efficient sulfur host for Li–S batteries. In consequence, S/Fe 3 O 4-NC exhibited a high initial discharge capacity of 1264 mA h g −1 at 0.1 A g −1, ...
We report engineered hollow core-shell interlinked carbon spheres that consist of a mesoporous shell, a hollow void, and an anchored carbon core and are expected to be ideal sulfur hosts for overcoming the shortage of Li-S batteries. The hollow core-shell interlinked carbon spheres were obtained thr …
The slow kinetics at the cathode of oxygen reduction reaction (ORR) seriously limits the efficiencies of fuel cells and metal-air batteries. Pt, the state-of-the-art ORR electrocatalyst, suffers from high cost, low earth abundance, and poor stability. Here a self-templated strategy based on metal-organic frameworks (MOFs) is proposed for the …
The synthesized covalent organic framework hollow spheres are highly porous (surface area ∼ 1,500 m 2 g −1 ), crystalline and chemically stable, due to the …
A detailed time-dependent study reveals the continuous transformation from initial nano sphere-like particles into uniform hollow spherical structures with Ostwald …
This review specifically highlights the recent developments of hollow spheres in NSL for directly fabricating novel nanostructures, CPCs with more advanced functionalities (e.g. lasing, optomicrofluidics, light …
Hollow porous carbon spheres (HPCSs) with micro/mesoporous combination shell and macroporous core are prepared through a facile and efficient hydrothermal method by using silica nanospheres as hard template and furfuryl alcohol (FA) as carbon source. ... highly efficient method of creating and storing energy without disruption to the ...
For example, we have reported the synthesis of uniform multi-shelled LiMn 2 O 4 hollow microspheres with a high purity. 91 Benefiting from the structural features of multi-shelled hollow structures, LiMn 2 O 4 hollow microspheres exhibit a better cycling stability than all the reported results based on uncoated or un-doped LiMn 2 O 4 (the ...
The development of simple and effective strategies to prepare electrocatalysts, which possess unique and stable structures comprised of metal/nonmetallic atoms for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), is currently an urgent issue. Herein, an efficient bifunctional electrocatalyst featured by …
Hollow carbon spheres (HCSs) attract broad interest in the area of electrocatalysis, especially in the oxygen reduction reaction (ORR) owing to their high surface area, abundant accessible active sites, discrete voids, and uniform channel/pore structures. Recently, advances have been made in surface and inte Journal of Materials …
The development of bimetallic transition-metal sulfide and nitrogen-doped carbon composites with unique hollow structure is highly desirable for energy storage applications but is also challenging. In the present work, we demonstrate a facile metal–organic framework engaged strategy for synthesizing bimetallic nickel cobalt …
The successful incorporation of g-C 3 N 4 into MXene in the hollow sphere composite is confirmed by the high-resolution XPS spectra, which reveal the presence of Ti and F elements (Fig. 3 b). Specifically, the Ti 2p spectrum of MXene is characterized by five distinct peaks, with Ti-C assignments at 455.2 and 461.2 eV, Ti-O at 457.1 and 463.2 eV ...
Fig. 6 C shows the BN hollow sphere. BNHSs is a proper alternative for hydrogen storage for their low density, large pore volume, highly defective structure, large hollow cavity, and high specific surface area [107, 145, 146]. Also, theoretical evaluations have shown that bipolar nature of B N bonds and a little buckling emerges on the surface.
The morphologies of the WS 2 –WC–WO 3 NH spheres and WS 2 NFs were carefully observed using FE-SEM, as shown in Fig. 2.The FE-SEM images of the WS 2 –WC–WO 3 NH spheres and WS 2 NFs were obtained at various magnifications to clearly observe their sizes, shapes, and morphologies. Figure 2a and c show the SEM images …
Xi, J. et al. Highly active, selective, and stable Pd single-atom catalyst anchored on N-doped hollow carbon sphere for electrochemical H 2 O 2 synthesis under acidic conditions. J. Catal. 393 ...
The rational design and facile synthesis of metal organic framework (MOF)-derived carbon materials with high oxygen reduction reaction (ORR) activity still remains challenging. Herein, we report on a simple yet robust route to dual-shelled Co, N, and S co-doped hollow carbon nanocages (denoted Co-N/S-DSHCN) with outstanding ORR performance. The …
Abstract. A facile and general method for the controllable synthesis of N-doped hollow mesoporous carbon nanocapsules (NHCNCs) with four different …
The morphology of the prepared HCs and NHCs was observed using the TEM images. With the assistance of TTAB, uniform mesoporous SiO 2 nanospheres with highly uniform size (∼60 nm) were obtained after TEOS hydrolysis (Fig. 1 (a)). Fig. 1 (b) shows PTES-modified mesoporous silica surface was decorated by tiny protrusions …
Benefiting from the mesoporous structure and high specific area (800 m 2 /g) of the hollow carbon nanospheres, fast capacitor-type ion adsorption/de-adsorption on both the cathode and the anode can be achieved, as well as additional battery-type Zn/Zn 2+ electroplating/stripping on the anode. This device thus demonstrates outstanding ...
Abstract. A novel kind of hollow carbon spheres with artificial surface openings is fabricated as highly effective electrode. This kind of carbon sphere …
Herein, we propose a novel low-cost and facile method to prepare TMD-TMC-TMO nano-hollow spheres (WS 2 -WC-WO 3 NH) as an efficient catalyst for the hydrogen evolution reaction (HER). The crystallinity, morphology, chemical bonding, and composition of the composite material were comprehensively investigated using X-ray …
Ceramic hollow spheres are being developed for electronic uses in piezoelectric transducers and low dielectric constant substrates, for structural applications in syntactic and metal foams, for fluid transport uses in filters and radiant burners, and for acoustic insulation. Fabrication of coarse hollow spheres (1–10 mm) is by nozzle or ...
December 04, 2023
December 09, 2023