scholarly journals Epitaxial Grown Carbon Nanotubes Reinforced Pyrocarbon Matrix in C/C Composites with Improved Mechanical Properties

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6607
Author(s):  
Ningkun Liu ◽  
Gang Kou ◽  
Lingjun Guo ◽  
Yunyu Li ◽  
Xuemin Yin
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Carbon Fibers ◽  
Structural Design ◽  
High Performance ◽  
Rational Design ◽  
Raman Analysis ◽  
Precise Control ◽  
Highly Efficient ◽  
Large Size

In order to achieve the highly efficient preparation of high-performance carbon/carbon (C/C) composites, epitaxial grown carbon nanotubes (CNTs) and a pyrocarbon matrix were simultaneously synthesized to fabricate CNT-reinforced C/C composites (CC/C composites). With precise control of the temperature gradient, CNTs and the pyrocarbon matrix could grow synchronously within a 2D needle-punched carbon fiber preform. Surprisingly, the CNTs remained intact within the pyrocarbon matrix at the nano-level, and the CNT-reinforced nano-pyrocarbon matrix was compact, with virtually no gaps and pores, which were tightly connected with the carbon fibers without cracks. Based on the results of Raman analysis, there is less residual stress in the CNT-reinforced pyrocarbon matrix and carbon fibers, and less of a mismatch between the coefficient and thermal expansion. Additionally, CC/C composites fabricated by this method could achieve a low density, open porosity with a large size, and improved mechanical properties. More importantly, our work provides a rational design strategy for the highly efficient preparation and structural design of high-performance CNT-einforced C/C composites.

Functionalization and Tip-open of Carbon Nanotubes for High-Performance Symmetric Supercapacitor

2021 ◽  
Author(s):  
Yaxiong Zhang ◽  
Erqing Xie
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Aspect Ratio ◽  
Specific Surface ◽  
Surface Area ◽  
Chemical Stability ◽  
High Aspect Ratio ◽  
High Performance ◽  
Large Specific Surface Area ◽  
Symmetric Supercapacitor

Carbon nanotubes (CNTs) have been widely studied as supercapacitor electrodes because of their excellent conductivity, high aspect ratio, excellent mechanical properties, chemical stability, and large specific surface area. However, the...

scholarly journals Impact of Alternative Stabilization Strategies for the Production of PAN-Based Carbon Fibers with High Performance

Fibers ◽  
2020 ◽  
Vol 8 (6) ◽  
pp. 33 ◽  
Author(s):  
Spyridon Soulis ◽  
George Konstantopoulos ◽  
Elias P. Koumoulos ◽  
Costas A. Charitidis
Keyword(s):  
Mechanical Properties ◽  
Carbon Fibers ◽  
Thermal Processing ◽  
High Performance ◽  
Relevant Literature ◽  
Thermomechanical Properties ◽  
Composition Effect ◽  
Ladder Polymer ◽  
Fiber Manufacturing ◽  
Time And Energy

The aim of this work is to review a possible correlation of composition, thermal processing, and recent alternative stabilization technologies to the mechanical properties. The chemical microstructure of polyacrylonitrile (PAN) is discussed in detail to understand the influence in thermomechanical properties during stabilization by observing transformation from thermoplastic to ladder polymer. In addition, relevant literature data are used to understand the comonomer composition effect on mechanical properties. Technologies of direct fiber heating by irradiation have been recently involved and hold promise to enhance performance, reduce processing time and energy consumption. Carbon fiber manufacturing can provide benefits by using higher comonomer ratios, similar to textile grade or melt-spun PAN, in order to cut costs derived from an acrylonitrile precursor, without suffering in regard to mechanical properties. Energy intensive processes of stabilization and carbonization remain a challenging field of research in order to reduce both environmental impact and cost of the wide commercialization of carbon fibers (CFs) to enable their broad application.

Crystal structural design of exposed planes: express channels, high-rate capability cathodes for lithium-ion batteries

Nanoscale ◽  
2018 ◽  
Vol 10 (37) ◽  
pp. 17435-17455 ◽  
Author(s):  
Shiyuan Zhou ◽  
Tao Mei ◽  
Xianbao Wang ◽  
Yitai Qian
Keyword(s):  
Lithium Ion Batteries ◽  
Structural Design ◽  
High Performance ◽  
Rational Design ◽  
Rate Capability ◽  
Lithium Ion ◽  
High Rate ◽  
High Rate Capability ◽  
Crystal Structural

The rational design of crystal planes with express channels is an effective approach to develop the high-performance cathodes for lithium ion batteries.

Highly efficient electro-generation of H2O2 by a nitrogen porous carbon modified carbonaceous cathode during the oxygen reduction reaction

2020 ◽  
Vol 44 (37) ◽  
pp. 15942-15950
Author(s):  
Ling Tao ◽  
Yang Yang ◽  
Fangke Yu
Keyword(s):  
Carbon Nanotubes ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Modified Electrode ◽  
Carbon Fibers ◽  
Active Carbon ◽  
Porous Carbon ◽  
Reduction Reaction ◽  
Nitrogen Doped ◽  
Highly Efficient

In this work, active carbon fibers (ACFs) were modified with nitrogen-doped porous carbon (NPC) and carbon nanotubes (CNTs) to prepare a novel modified electrode as a cathode.

A high-performance flexible and weavable asymmetric fiber-shaped solid-state supercapacitor enhanced by surface modifications of carbon fibers with carbon nanotubes

2016 ◽  
Vol 4 (46) ◽  
pp. 18164-18173 ◽  
Author(s):  
Xiaoyu Lu ◽  
Yang Bai ◽  
Ranran Wang ◽  
Jing Sun
Keyword(s):  
Carbon Nanotubes ◽  
Activated Carbon ◽  
Solid State ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
High Performance ◽  
Negative Electrode ◽  
Surface Modifications ◽  
High Energy ◽  
Power Densities

A carbon fiber-based positive electrode enhanced by CNT modification with NiCo(OH)x and a negative electrode functionalized with activated carbon were prepared. The supercapacitor showed high energy and power densities.

Fex-Co1-x bimetallic catalysts for highly efficient growth of carbon nanotubes on carbon fibers

2020 ◽  
Vol 46 (17) ◽  
pp. 27158-27162
Author(s):  
Zhiqiang Yao ◽  
Chengguo Wang ◽  
Jianjie Qin ◽  
Yanxiang Wang ◽  
Qifen Wang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Fibers ◽  
Bimetallic Catalysts ◽  
Highly Efficient

Constructing a 3D compact sulfur host based on carbon-nanotube threaded defective Prussian blue nanocrystals for high performance lithium–sulfur batteries

2020 ◽  
Vol 8 (3) ◽  
pp. 1154-1163 ◽  
Author(s):  
Guohong Shen ◽  
Zhixiao Liu ◽  
Piao Liu ◽  
Junfei Duan ◽  
Hussein A. Younus ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Prussian Blue ◽  
High Performance ◽  
Host Material ◽  
Highly Efficient ◽  
Lithium Sulfur Batteries ◽  
Sulfur Host ◽  
Lithium Sulfur

Towards practical lithium–sulfur batteries, a highly efficient sulfur host material based on intertwined carbon-nanotubes (CNTs) and defective Prussian blue (PB) nanocrystals is developed.

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