Preparation and modification of high performance porous carbons from petroleum coke for use as supercapacitor electrodes
Publication date: June 2016 Source:New Carbon Materials, Volume 31, Issue 3 Author(s): Ming-hui Tan, Peng Li, Jing-tang Zheng, Tsubaki Noritatsu, Ming-bo Wu As a byproduct of oil refining, petroleum coke with a high carbon content (about 90 wt%) has been shown to be a good raw material for porous carbons (PCs). PCs with high specific surface areas were derived from petroleum coke by KOH activation. The effect of KOH/coke mass ratio on the pore structure of the PCs and their electrochemical performance as electrodes of electric double layer capacitors were investigated. Results showed that the specific surface area a...
Source: New Carbon Materials - August 11, 2016 Category: Chemistry Source Type: research
A hierarchically porous CuCo2S4/graphene composite as an electrode material for supercapacitors
Publication date: June 2016 Source:New Carbon Materials, Volume 31, Issue 3 Author(s): Li-le Liu, K P Annamalai, You-sheng Tao A CuCo2S4/graphene composite was synthesized using a simple hydrothermal method. The sample was characterized by field emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, nitrogen adsorption and electrochemical tests. The composite had a hierarchical porous structure with micropores of 0.7-1.2 nm, mesopores of 2-10 nm and a total pore volume of 0.1 cm3·g−1, and the CuCo2S4 had a nano-belt structure. As the electrode of a supercapacitor the composite s...
Source: New Carbon Materials - August 11, 2016 Category: Chemistry Source Type: research
Electrochemical performance of rod-type ordered mesoporous carbons with different rod lengths for electric double-layer capacitors
Publication date: June 2016 Source:New Carbon Materials, Volume 31, Issue 3 Author(s): Na Liu, Lu-qiang Yu, Xiao-hong Chen, Li-fang Liao, Ji-sheng Zhou, Zao-kun Ma, Huai-he Song Rod-type ordered mesoporous carbons were synthesized by the direct carbonization of sulfuric-acid-treated silica/triblock copolymer composites, followed by etching the silica with a HF solution. The morphologies, microstructures and pore structures of the mesoporous carbons were investigated by scanning electron microscopy, high resolution transmission electron microscopy, X-ray diffraction and nitrogen sorption. Their electrochemical perf...
Source: New Carbon Materials - August 11, 2016 Category: Chemistry Source Type: research
Preparation of graphene nanoscroll/polyaniline composites and their use in high performance supercapacitors
Publication date: June 2016 Source:New Carbon Materials, Volume 31, Issue 3 Author(s): Bing-na Zheng, Chao Gao The graphene nanoscroll is a kind of tubular graphene with an open end and a helical nanostructure. Different amounts of polyaniline were formed on the surface of the nanoscroll by the in-situ polymerization of aniline. SEM observation shows that the polyaniline nanoparticles are evenly distributed on the nanoscrolls and the number of free polyaniline clusters increases with the amount of monomer used. The electrochemical performance of three composites with different polyaniline/graphene nanoscroll ratios was...
Source: New Carbon Materials - August 11, 2016 Category: Chemistry Source Type: research
Effect of the pH of the preparation medium on the microstructure and electrocatalytic activity of carbon nanotubes decorated with PtSn nanoparticles for use in methanol oxidation
Publication date: June 2016 Source:New Carbon Materials, Volume 31, Issue 3 Author(s): Hai-chao Li, Shui-xia Chen, Qi-han Li, Feng-lei Liu Carbon nanotubes (CNTs) decorated with PtSn nanoparticles (PtSn/CNT) were prepared by the microwave-assisted ethylene glycol reduction method and characterized by atomic adsorption spectroscopy, X-ray diffraction and transmission electron microscopy. Results indicated that the loading efficiency of the metal catalyst, and the degree of alloying and morphology of the PtSn nanoparticles were significantly affected by the solution pH value of the metallic ions in the ethylene glycol....
Source: New Carbon Materials - August 11, 2016 Category: Chemistry Source Type: research
Preparation of porous carbon nanofibers with controllable pore structures for low-concentration NO removal at room temperature
Publication date: June 2016 Source:New Carbon Materials, Volume 31, Issue 3 Author(s): Ming-xi Wang, Ze-yu Guo, Zheng-hong Huang, Fei-yu Kang Porous carbon nanofibers (PCNFs) with controllable pore structures for removing low-concentrations of NO at room temperature were prepared from electrospun polyacrylonitrile nanofibers by oxidative stabilization, carbonization and steam activation. The PCNFs had high surface areas and abundant micropores, which were favorable for the adsorption and catalytic oxidation of NO at ambient temperature. The diameter of the fibers and their pore structure were tailored by adjusting th...
Source: New Carbon Materials - August 11, 2016 Category: Chemistry Source Type: research
Carbon-based cathodes for sodium-air batteries
Publication date: June 2016 Source:New Carbon Materials, Volume 31, Issue 3 Author(s): Shan Liu, Si-si Liu, Jia-yan Luo Sodium-air batteries are considered promising electrochemical devices for energy storage owing to their high theoretical energy density, high discharge voltage and the abundance of sodium in nature. The recent progress, current challenges and developing trends for Na-air batteries are summarized. The use of carbon materials as their cathode is highlighted. (Source: New Carbon Materials)
Source: New Carbon Materials - August 11, 2016 Category: Chemistry Source Type: research
Microwave assisted preparation of expanded graphite/sulfur composites as cathodes for Li-S batteries
Publication date: April 2016 Source:New Carbon Materials, Volume 31, Issue 2 Author(s): Fu-liang Zhu, Zhi Yang, Jin-ping Zhao, Xin Zhao Expanded graphite/sulfur (EG/S) composites were prepared by microwave irradiation of mixtures of sulfur and expanded graphite with S/EG ratios from 4:1 to 12:1. Sulfur was sublimed and entered the EG pores when the mixtures were heated and was condensed to form particles within the pores during cooling. The pores of the EG acted as microcontainers to host the sulfur, and the material, with its interconnected and conductive pore walls, acted as a current collector for the cathod...
Source: New Carbon Materials - May 16, 2016 Category: Chemistry Source Type: research
The oxidation behavior of A3-3 matrix graphite
Publication date: April 2016 Source:New Carbon Materials, Volume 31, Issue 2 Author(s): Xiang-wen Zhou, Zhen-ming Lu, Xin-nan Li, Jie Zhang, Bing Liu, Ya-ping Tang The effects of temperature on the oxidation behavior of the A3-3 matrix graphite (MG) in the temperature range 798-973 K in air with a flow rate of 100 ml/min to burn-offs of 10-15 wt%, were investigated by a home-made thermo-gravimetric experimental setup. The oxidation rate (OR) increases significantly with the temperature. The OR at 973 K is over 70 times faster than at 798 K. The oxidation kinetics of A3-3 MG in air at temperatures up to 973 ...
Source: New Carbon Materials - May 16, 2016 Category: Chemistry Source Type: research
Influence of the microstructure of the carbon matrices on the internal friction behavior of carbon/carbon composites
Publication date: April 2016 Source:New Carbon Materials, Volume 31, Issue 2 Author(s): Wei Yang, Rui-ying Luo, Zhen-hua Hou, You Zhang, Hai-dong Shang, Ming-yang Hao Three carbon/carbon composites with rough laminar, smooth laminar and dual matrix carbon were prepared by chemical vapor infiltration (CVI) using hydrogen-diluted methane, CVI using nitrogen-diluted propane, and two-step CVI using first methane/hydrogen and carbon dioxide and then furan resin impregnation and carbonization. The influence of the microstructure of the carbon matrix on the internal friction behavior of the composites was investig...
Source: New Carbon Materials - May 16, 2016 Category: Chemistry Source Type: research
Synthesis of carbon nanoparticles from waste rice husk used for the optical sensing of metal ions
Publication date: April 2016 Source:New Carbon Materials, Volume 31, Issue 2 Author(s): Peggy Zhen Zhen Ngu, Stephanie Pei Phing Chia, Jessica Fung Yee Fong, Sing Muk Ng This work reports on a synthesis of carbon nanoparticles (CNPs) from waste rice husk by thermally-assisted carbonization in the presence of concentrated sulfuric acid. The fluorescent emmision characteristics of the CNPs, their quenching effects by metal ions and their use as a sensing material for Sn(II) ions were investigated. Results indicated that the yield of CNPs was optimized at a sulphuric acid concentration of 12 mol/L, heating tempera...
Source: New Carbon Materials - May 16, 2016 Category: Chemistry Source Type: research
Titania nanotube-graphene oxide hybrids with excellent photocatalytic activities
Publication date: April 2016 Source:New Carbon Materials, Volume 31, Issue 2 Author(s): Qi Lai, Xue-ping Luo, Shi-fu Zhu Titania nanotube-graphene oxide (TiO2 NT-GO) hybrids were prepared by a hydrothermal reaction followed by calcination at different temperatures. Results indicate that flat sheets of GO promote the formation of the TiO2 NTs. GO is reduced during the hydrothermal and calcination steps, and is inserted into the TiO2 layers by the interaction between oxygen-containing groups on both the GO and TiO2. The rates of GO decomposition, GO reduction and TiO2 NT formation are temperature dependent. The TiO...
Source: New Carbon Materials - May 16, 2016 Category: Chemistry Source Type: research
Synthesis of hollow carbon nanostructures using a ZnO template method
Publication date: February 2016 Source:New Carbon Materials, Volume 31, Issue 1 Author(s): Hong-yang Liu, Zhen-bao Feng, Jia Wang, Jiang-yong Diao, Dang-sheng Su A ZnO template approach for the large scale synthesis of hollow carbon nanostructures was developed. A diluted ethylbenzene stream was used to form a carbon layer on the template at a high temperature and a dilute HCl solution was used to etch the template. Hollow carbon nanotubes and hollow carbon nanospheres were fabricated using ZnO nanorods and nanospheres as the respective templates. The present process is simple, efficient and low cost, and may...
Source: New Carbon Materials - March 10, 2016 Category: Chemistry Source Type: research
The catalytic role of aluminium trichloride in the polymerization and carbonization of coal tar
Publication date: February 2016 Source:New Carbon Materials, Volume 31, Issue 1 Author(s): Miao Duan, Yong-ming Tian, Si-zhong Li The polymerization and carbonization of coal tar was carried out at different temperatures from 633 to 1873 K using aluminium trichloride as catalyst. The polymerization degree, microstructures and optical texture of samples were analyzed by thermogravimetry, X-ray diffraction, Raman spectroscopy and polarized light microscopy. Results indicated that aluminium trichloride accelerated dehydrogenation during the polymerization of coal tar, and increased the toluene-insoluble fraction and...
Source: New Carbon Materials - March 10, 2016 Category: Chemistry Source Type: research
Recycling of carbon fibers in epoxy resin composites using supercritical 1-propanol
Publication date: February 2016 Source:New Carbon Materials, Volume 31, Issue 1 Author(s): Hua Yan, Chun-xiang Lu, De-qi Jing, Chun-bao Chang, Na-xin Liu, Xiang-lin Hou The effects of degradation temperature, reaction time and additive on the efficiency of the recovery of carbon fibers from their epoxy resin composites by supercritical 1-propanol were investigated. The recycled carbon fibers were characterized using SEM, TGA, XPS, contact angle measurements and single fiber tensile strength tests. Results indicated that the rate of decomposition of the resin increased, but the mechanical properties of the r...
Source: New Carbon Materials - March 10, 2016 Category: Chemistry Source Type: research
