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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 ...
The construction of hollow mesoporous carbon nanospheres (HMCS) avoiding the use of traditional soft/hard templates is highly desired for nanoscience yet challenging. Herein, we report a simple and straightforward template-free strategy for preparing nitrogen, sulfur dual-doped HMCSs (N/S-HMCSs) as oxygen reduction reaction (ORR) electrocatalysts.
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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 …
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 …
The outstanding activity of the Pt-Co hollow nanospheres for HER is mainly attributed to its highly accessible electron/mass transport path, expose active sites on the ultra-thin shells and strain effect induced by the hollow sphere structure. This hollow nanospheres with ultra-thin shell provides a promising way to develop highly efficient ...
Due to the unique advantages including low density, good chemical stability, and superior dielectric property, carbon-based materials have been exploited as potential microwave absorbers and have become a research hotspot. Herein, a superior microwave absorbent consisting of NiCo2S4 nanosheets anchored on hollow carbon spheres is …
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 …
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Hydrogen peroxide is a widely used and important chemical in industry. A two-electron electrochemical oxygen reduction reaction (2e– ORR) is a clean and on-site method for H2O2 production. Here, we report metal-free catalysts (mesoporous carbon hollow spheres, MCHS) for high-efficiency H2O2 production in neutral electrolytes (0.1 …
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 ...
N-doped hollow carbon spheres with high performance in supercapacitor benefiting from its relative uniform and dispersed spherical morphology, carbon shell with rich mesoporous, high surface area and nitrogen doping are prepared by improved dissolution-capture using 3-aminophenol-formaldehyderesin spheres as carbon …
The wet-chemical synthesis of hollow graphitic spheres, a highly defined model catalyst support for electrocatalytic processes, is laborious and not scalable, which hampers potential applications. Here, we present insights into the chemical vapor deposition (CVD) of ferrocene as a simple, scalable method to synthesize hollow graphitic spheres …
3.1. Composition classification3.1.1. Hollow metal hydroxides heterostructures. MOF-derived hollow hydroxides heterostructured are typically created by chemical etching with chemical reagents in the solution, in which the chemical reagents like acids, bases, and metal salts could easily break the weak coordination bonds between …
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 g Zn −1) and outstanding cycling stability (over 200 h), which are more durable than the commercialized Pt/C+RuO 2-based device.
Surface-nitrogen enriched carbon spheres with core–shell structure were prepared by a facile and general strategy with dopamine and melamine as the precursors. This strategy includes three steps: the polymerization of dopamine to form polydopamine (PDA) spheres, the soaking of spheres in melamine (MA) and the pyrolysis of PDA …
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The FTIR spectrum of the Tb-MOFs is shown in Fig. 3b.The characteristic band 650–900 cm −1 was due to the out-plane bending vibration of C–H in benzene ring of Tb-MOFs. The peak at 918 cm −1 can be attributed to the out-plane bending vibration of hydroxyl group. Peaks at 1626 cm −1 and 1434 cm −1 (or 1568 cm −1 and 1375 cm −1) are attributed to …
The development of nonprecious electrocatalyst with low cost and high efficiency for the oxygen reduction reaction (ORR) is a main challenge for electrochemical energy technology. In this work, a hierarchical hollow core–shell structured N-doped carbon spheres (N-HSCS), in which Fe3O4 nanoparticles are encapsulated (Fe3O4/N-HCSC) has been successfully …
The hydrogenation of CO 2 to CH 4 is attracting growing attention due to the universal energy and climate challenges. In this work, we present the facile synthesis of hierarchical Ni@C spheres composed of dispersed Ni nanoparticles confined in carbon shells as an efficient catalyst for low-temperature CO 2 methanation at ambient pressure. With Ni …
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Unlike hollow sphere structure of 3D-Sp-COF, 3D-SpOH-COF shows a solid sphere structure even with reaction time over 96 h (Supplementary Fig. 20b, 3D-SpOH-COF@96 h).
Furthermore, by adding holes on the surface of the sphere, the porous foams using a hollow sphere exhibit a maximized porosity of 80.69%, remarkably enhanced their insulation properties with low thermal conductivity (0.10 W/m-K), and have sufficient compressive strength to protect the green body (5.7 MPa).
Furthermore, HPCSs-2 was mixed with solid KOH at mass ratio of 1/2. Then the mixtures were heated at 800 °C for 1 h under Ar flow at a heating rate of 5 °C min −1.The resulted carbons were washed with 10 wt.% HCl solution and DI water successively until the PH value of filtrate was neutral.Finally, after dried at 60 °C overnight, the …
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 …
Besides, these materials with 3D sphere hollow structures reported, ... As shown in Fig. 2a,d, the highly uniform NHCNCs with average diameters of 180 ± 10 nm can be observed.
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In terms of the number of the shell layers, MOF-derived hollow structures can be easily divided into two types: Single-shelled and multishelled nanoarchitectures [14].Generally, hollow structures with single shell can be obtained by simply calcining the MOFs precursor at high temperature [15].For example, our group developed a "active …
December 04, 2023
December 09, 2023