Synthesis of Carbon/Carbon Core/Shell Nanofibers by Co-Pyrolysis of Tetrahydrofuran and Ferrocene

2011 ◽  
Vol 306-307 ◽  
pp. 1211-1214
Author(s):  
Wen Jun Kang ◽  
Hai Bo Li ◽  
Yan Yan ◽  
Yi Tai Qian
Keyword(s):  
Carbon Materials ◽  
Reaction System ◽  
Carbon Shell ◽  
Iron Catalysts ◽  
Core Shell ◽  
Solid Carbon ◽  
Carbon Spheres ◽  
Graphene Layers ◽  
Carbon Core ◽  
20 Nm

Carbon/carbon core/shell nanofibers with length up to several micrometres have been prepared by co-pyrolysis of tetrahydrofuran and ferrocene in a stainless steel autoclave at 600 °C. The diameter of carbon core is ~10 nm, and the thickness of carbon shell is ~20 nm. It is found that the graphene layers of carbon core are perpendicular to the ones of carbon shell in stacking orientation. Comparative experiments confirm that the metallic iron catalysts, originating from the decomposition of ferrocene, are responsible for the formation of nanofibers. When the ferrocene is absence, only solid carbon spheres are observed. Moreover, hollow hexapod-like carbon materials can be obtained with water introduced into reaction system.

Nanoconfinement Induced Formation of Core/Shell Structured Mesoporous Carbon Spheres Coated with Solid Carbon Shell

2013 ◽  
Vol 5 (8) ◽  
pp. 3042-3047 ◽  
Author(s):  
Karolina Wenelska ◽  
Krzysztof Kierzek ◽  
Ryszard J. Kaleńczuk ◽  
Xuecheng Chen ◽  
Ewa Mijowska
Keyword(s):  
Mesoporous Carbon ◽  
Carbon Shell ◽  
Core Shell ◽  
Solid Carbon ◽  
Carbon Spheres

Controllable fabrication of a N and B co-doped carbon shell on the surface of TiO2 as a support for boosting the electrochemical performances

2017 ◽  
Vol 5 (4) ◽  
pp. 1672-1678 ◽  
Author(s):  
Ying Chang ◽  
Conghui Yuan ◽  
Yuntong Li ◽  
Cheng Liu ◽  
Tong Wu ◽  
...  
Keyword(s):  
Shell Thickness ◽  
Pt Nanoparticles ◽  
Carbon Shell ◽  
Core Shell ◽  
Electrochemical Performances ◽  
Carbon Core ◽  
Controllable Fabrication ◽  
Co Doped

Pt nanoparticles loaded on TiO2@N,B co-doped carbon core–shell supports with tunable shell thickness possess enhanced electrochemical performances.

Edge-oriented MoS2 supported on nickel/carbon core–shell nanospheres for enhanced hydrogen evolution reaction performance

2019 ◽  
Vol 43 (16) ◽  
pp. 6146-6152 ◽  
Author(s):  
Yin Wang ◽  
Zegao Wang ◽  
Qian Yang ◽  
An Hua ◽  
Song Ma ◽  
...  
Keyword(s):  
Molybdenum Disulfide ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Carbon Shell ◽  
Core Shell ◽  
Reaction Performance ◽  
Carbon Core

Edge-oriented molybdenum disulfide, growing on the surface of carbon shell with a nickel core, exhibits the enhanced performance on hydrogen evolution reaction.

SiC/HfyTa1−yCxN1−x/C ceramic nanocomposites with HfyTa1−yCxN1−x-carbon core–shell nanostructure and the influence of the carbon-shell thickness on electrical properties

2018 ◽  
Vol 6 (4) ◽  
pp. 855-864 ◽  
Author(s):  
Qingbo Wen ◽  
Zhaoju Yu ◽  
Yeping Xu ◽  
Yan Lu ◽  
Claudia Fasel ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Electrical Properties ◽  
Shell Thickness ◽  
Carbon Shell ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Carbon Core ◽  
Core Shell Nanoparticles ◽  
Ceramic Nanocomposites

Thickness of the carbon shell on the HfyTa1−yCxN1−x-carbon core–shell nanoparticles significantly influences the electrical conductivity of the SiC/HfyTa1−yCxN1−x/C ceramic nanocomposites.

Effect of carbon shell thickness on the microwave absorption of magnetite-carbon core-shell nanoparticles

2016 ◽  
Vol 42 (13) ◽  
pp. 14548-14556 ◽  
Author(s):  
Omid Khani ◽  
Morteza Zargar Shoushtari ◽  
Mohammad Jazirehpour ◽  
Mohammad Hossein Shams
Keyword(s):  
Microwave Absorption ◽  
Shell Thickness ◽  
Carbon Shell ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Carbon Core ◽  
Core Shell Nanoparticles

Ion-biosorption induced core–shell Fe2P@carbon nanoparticles decorated on N, P co-doped carbon materials for the oxygen evolution reaction

2021 ◽  
Author(s):  
Min Jiang ◽  
Wei Fan ◽  
Anquan Zhu ◽  
Pengfei Tan ◽  
Jianping Xie ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Carbon Nanoparticles ◽  
Carbon Materials ◽  
Cost Effective ◽  
Core Shell ◽  
Co Doped

This work employs bacteria as precursors and induces a cost-effective biosorption strategy to obtain Fe2P@carbon nanoparticles decorated on N and P co-doped carbon (Fe2P@CNPs/NPC) materials.

scholarly journals High Capacity and Fast Kinetics of Potassium-Ion Batteries Boosted by Nitrogen-Doped Mesoporous Carbon Spheres

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Jiefeng Zheng ◽  
Yuanji Wu ◽  
Yong Tong ◽  
Xi Liu ◽  
Yingjuan Sun ◽  
...  
Keyword(s):  
Mesoporous Carbon ◽  
Active Sites ◽  
Carbon Materials ◽  
Potassium Ion ◽  
High Rate ◽  
Electrochemical Performances ◽  
Carbon Spheres ◽  
Fast Kinetics ◽  
Nitrogen Doped ◽  
Economic Price

AbstractIn view of rich potassium resources and their working potential, potassium-ion batteries (PIBs) are deemed as next generation rechargeable batteries. Owing to carbon materials with the preponderance of durability and economic price, they are widely employed in PIBs anode materials. Currently, porosity design and heteroatom doping as efficacious improvement strategies have been applied to the structural design of carbon materials to improve their electrochemical performances. Herein, nitrogen-doped mesoporous carbon spheres (MCS) are synthesized by a facile hard template method. The MCS demonstrate larger interlayer spacing in a short range, high specific surface area, abundant mesoporous structures and active sites, enhancing K-ion migration and diffusion. Furthermore, we screen out the pyrolysis temperature of 900 °C and the pore diameter of 7 nm as optimized conditions for MCS to improve performances. In detail, the optimized MCS-7-900 electrode achieves high rate capacity (107.9 mAh g−1 at 5000 mA g−1) and stably brings about 3600 cycles at 1000 mA g−1. According to electrochemical kinetic analysis, the capacitive-controlled effects play dominant roles in total storage mechanism. Additionally, the full-cell equipped MCS-7-900 as anode is successfully constructed to evaluate the practicality of MCS.

Formation of Core-Shell Nanoparticles by Laser Ablation of Copper and Brass in Liquids

2005 ◽  
Vol 106 ◽  
pp. 23-26 ◽  
Author(s):  
P.V. Kazakevich ◽  
A.V. Simakin ◽  
V.V. Voronov ◽  
G.A. Shafeev ◽  
D. Starikov ◽  
...  
Keyword(s):  
Core Shell ◽  
Copper Vapour Laser ◽  
Shell Nanoparticles ◽  
Liquid Environment ◽  
Pulsed Nd:Yag Laser ◽  
Plasmon Peak ◽  
Average Size ◽  
Core Shell Nanoparticles ◽  
20 Nm ◽  
Surrounding Liquid

Experimental results are presented on the ablation of copper and brass targets in a liquid environment: ethanol, acetone, or water by irradiation with either a pulsed copper vapour laser (0.51 μm) or a pulsed Nd:YAG laser (1.06 μm). The ablated material was ejected into the surrounding liquid as nanoparticles of average size 20 nm. The nanoparticle composition depends on the nature of the liquid. Ablation of 60%Cu, 40%Zn brass in ethanol results in formation of core-shell nanoparticles. Brass nanoparticles were characterized by a well-defined plasmon peak at 510-520 nm.

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