Facile, general and template-free construction of monodisperse yolk–shell metal@carbon nanospheres

2017 ◽  
Vol 53 (89) ◽  
pp. 12136-12139 ◽  
Author(s):  
Fei Xu ◽  
Yuheng Lu ◽  
Junhao Ma ◽  
Zhike Huang ◽  
Quanfei Su ◽  
...  
Keyword(s):  
Carbon Nanostructures ◽  
Carbon Nanospheres ◽  
Free Construction ◽  
Template Free

A versatile, general and template-free strategy for the construction of well-defined yolk–shell metal@carbon nanostructures is described.

A facile template free synthesis of porous carbon nanospheres with high capacitive performance

2018 ◽  
Vol 61 (5) ◽  
pp. 538-544 ◽  
Author(s):  
Junyu Piao ◽  
Deshan Bin ◽  
Shuyi Duan ◽  
Xijie Lin ◽  
Dong Zhang ◽  
...  
Keyword(s):  
Porous Carbon ◽  
Carbon Nanospheres ◽  
Capacitive Performance ◽  
Template Free ◽  
Porous Carbon Nanospheres

scholarly journals Electrocatalytic Assisted Performance Enhancement for the Na-S Battery in Nitrogen-Doped Carbon Nanospheres Loaded with Fe

Molecules ◽  
2020 ◽  
Vol 25 (7) ◽  
pp. 1585 ◽  
Author(s):  
Jianhui Zhu ◽  
Amr Abdelkader ◽  
Denisa Demko ◽  
Libo Deng ◽  
Peixin Zhang ◽  
...  
Keyword(s):  
Energy Storage ◽  
Carbon Nanostructures ◽  
Room Temperature ◽  
Performance Enhancement ◽  
Energy Storage And Conversion ◽  
Carbon Nanospheres ◽  
Shuttle Effect ◽  
Electrocatalytic Effect ◽  
Sodium Sulfur ◽  
Fe Ions

Room temperature sodium-sulfur batteries have been considered to be potential candidates for future energy storage devices because of their low cost, abundance, and high performance. The sluggish sulfur reaction and the “shuttle effect” are among the main problems that hinder the commercial utilization of room temperature sodium-sulfur batteries. In this study, the performance of a hybrid that was based on nitrogen (N)-doped carbon nanospheres loaded with a meagre amount of Fe ions (0.14 at.%) was investigated in the sodium-sulfur battery. The Fe ions accelerated the conversion of polysulfides and provided a stronger interaction with soluble polysulfides. The Fe-carbon nanospheres hybrid delivered a reversible capacity of 359 mAh·g−1 at a current density of 0.1 A·g−1 and retained a capacity of 180 mAh·g−1 at 1 A·g−1, after 200 cycles. These results, combined with the excellent rate performance, suggest that Fe ions, even at low loading, are able to improve the electrocatalytic effect of carbon nanostructures significantly. In addition to Na-S batteries, the new hybrid is anticipated to be a strong candidate for other energy storage and conversion applications such as other metal-sulfur batteries and metal-air batteries.

Carbon Nanospheres for Biomedical Applications

2007 ◽  
Vol 1064 ◽  
Author(s):  
Courtney Styres ◽  
Inessa Stanishevskaya ◽  
Tahseen Nasti ◽  
Nabiha Yusuf ◽  
Maaike Everts ◽  
...  
Keyword(s):  
Carbon Nanostructures ◽  
Biomedical Applications ◽  
Size Structure ◽  
Spherical Particles ◽  
Epidermal Keratinocytes ◽  
Process Conditions ◽  
Core Shell ◽  
Carbon Nanospheres ◽  
Seed Particles ◽  
Carbon Core

ABSTRACTCarbon nanostructures, e.g., nanotubes, fullerenes, carbon blacks, etc., are being extensively explored for numerous biomedical applications. The most of such studies, however, deal with carbon nanotubes, and comparatively less is known on the biomedical potential of other nanosize carbon particles. In the present work, carbon and metal/carbon core/shell spherical nanoparticles have been prepared using the decomposition of monosaccharide-based compositions under hydrothermal conditions with or without the presence of metal seed particles. The effects of different process conditions on the particle size, structure, and composition have been examined using TEM, XRD, UV-Vis, FTIR and Raman spectroscopies. The nearly perfect spherical particles with the dimensions in the range of 20 – 100 nm have been obtained depending on the process parameters such as precursor concentration, presence of seed particles and polymeric additives, process temperature and time. The particles prepared with 5 – 20 nm gold seeds clearly showed the core/shell structure with the thickness of carbon shell in the range of 10 – 50 nm. The FTIR experiments have indicated a strong effect of the processing conditions on the chemical activity of nanoparticle surfaces in the attachment of the additional surface functional groups and organic molecules. It has been found that the both hydrothermally prepared carbon and metal/carbon core/shell nanoparticles possess very good dispersibility and stability in the both water and simulated body fluids in the most of experiments. The particles have been successfully functionalized with several molecules such as polyethyleneglucol and biotin. Selected samples of well-dispersed carbon nanospheres with different concentrations have been tested for their interaction with several cultured cell lines including epidermal keratinocytes, fibroblasts, and dog macrophages.

Spherical Carbon Nanostructures - A Versatile Material for Sensing and Energy Storage

2006 ◽  
Vol 951 ◽  
Author(s):  
Bettina Friedel ◽  
Siegmund Greulich-Weber
Keyword(s):  
Carbon Nanostructures ◽  
Photonic Bandgap ◽  
Catalyst Support ◽  
Lithium Ion ◽  
Spherical Shape ◽  
Infrared Region ◽  
Carbon Spheres ◽  
Separation And Purification ◽  
Carbon Nanospheres ◽  
Wide Range

ABSTRACTMonodisperse smooth carbon nanospheres were synthesized via preparation and complex subsequent multistage pyrolysis of spherical melamine formaldehyde copolymer microparticles. The diameters of optained carbon spheres were located between several tens to several hundreds nanometers depending on the size of used initial copolymer particles. During the conversion of copolymer to carbon, the spheres pass strong shrinking of more than 80 % without any deformation. They meet the high quality standards of common prepared and used polymer and silica spheres and are therefore a promising material with great potential. Carbon nanoparticles could be used in a wide range of applications, such as for gas storage, fuel cells, sensing, catalyst support, separation and purification, supercapacitors or lithium-ion batteries, and photonic bandgap materials. Especially for the last mentioned usage monodispersity and a perfect spherical shape are very important. So-called synthetic opals from carbon spheres have been grown by sonic-supported sedimentation and a photonic bandgap in the infrared region has been found. Due to their high thermal resistance under non-oxidizing conditions carbon opals are also suitable as template for inverse opals. The structure of the spheres has been studied during different stages of carbonization by scanning electron microscopy, nuclear magnetic resonance and fourier transform infrared spectroscopy.

scholarly journals Template-free construction of hollow ZnFe2O4 nanotubes coated with a nano-carbon layer as a competitive anode for Li-ion batteries

2020 ◽  
Vol 2 (6) ◽  
pp. 2284-2287
Author(s):  
Senyang Xu ◽  
Li Qin ◽  
Fakhr uz Zaman ◽  
Jinyang Zhang ◽  
Linrui Hou ◽  
...  
Keyword(s):  
Carbon Layer ◽  
Li Ion Batteries ◽  
Free Construction ◽  
Li Ion ◽  
Template Free ◽  
Nano Carbon

1D hollow ZnFe2O4 nanotubes coated with an ultrathin nano-carbon layer are delicately constructed via an efficient template-free strategy and exhibited superior rate behaviors and a long lifespan as a competitive anode for Li-ion batteries.

Template‐Free Construction of Self‐Supported Sb Prisms with Stable Sodium Storage

2019 ◽  
Vol 9 (24) ◽  
pp. 1901096 ◽  
Author(s):  
Xinyan Li ◽  
Menglei Sun ◽  
Jiangfeng Ni ◽  
Liang Li
Keyword(s):  
Free Construction ◽  
Construction Of Self ◽  
Template Free ◽  
Sodium Storage
Sign in / Sign up

Export Citation Format

Share Document