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| 1 | Low-cost, green synthesis of highly porous carbons derived from lotus root shell as superior performance electrode materials in supercapacitor显示文摘Facile production of high quality activated carbons from biomass materials has greatly triggered much attention presently. In this paper, a series of interconnected porous carbon materials from lotus root shells biomass are prepared via simple pyrolysis and followed by a KOH activation process. The prepared carbons exhibit high specific surface areas of up to 2961 m^2/g and large pore volume~1.47 cm3/g. In addition, the resultant porous carbons served as electrode materials in supercapacitor exhibit high specific capacitance and outstanding recycling stability and high energy density. In particular, their specific capacitance retention was almost 100% after 10500 cycles at a current density of 2 A/g. Remarkabely, the impact of the tailored specific surface areas of various carbon samples on their capacitive performances is systematically investigated.Generally, it was believed that the highly-developed porosity features(including surface areas and pore volume and pore size-distributions), together with the good conductivity of activated carbon species, play a key role in effectively improving the storage energy performances of the porous carbon electrode materials in supercapacitor. | Xin Wang Mengjiao Wang Xuemei Zhang Hejun Li Xiaohui Guo | 2016 | Journal of Energy Chemistry2016，25，1： | 6 |
| 2 | Microstructure and flexural properties of carbon/carbon composite with in-situ grown carbon nanotube as secondary reinforcement显示文摘Carbon nanotubes (CNTs) were in-situ grown in carbon felts using ferric chloride as catalyst and natural gas as carbon precursor via thermal gradient chemical vapor infiltration (TGCVI). Subsequently, the carbon felts were densified to obtain CNT reinforced carbon/carbon (C/C) composites in the same furnace. Effects of CNTs on the microstructure and flexural property of C/C composites were investigated by polarized light microscopy, Raman spectroscopy, scanning electron microscopy and universal mechanical testing machine. The results of PLM observation and Raman analysis showed that CNTs have two-sided effects on the microstructure of pyrocarbon: the pyrocarbons in the region without CNTs show medium texture; while, in the region full of CNTs, the microstructure was low-textured or even isotropic though the TGCVD conditions would lead to the deposition of pure low texture pyrocarbons. Analysis based on stress-strain curves demonstrated that the flexural strength increased first and then decreased with the CNT content increasing. When the CNT content was 5.23 wt%, the flexural strength was maximum and had a nearly 35% improvement compared with pure C/C composite. Besides, after adding CNTs, the flexural modulus of the composites decreased and the ductility increased obviously, indicating CNTs can toughen C/C composites. | Hai Zhang Lingjun Guo Qiang Song Qiangang Fu Hejun Li Kezhi Li | 2013 | Progress in Natural Science:Materials International2013，23，2： | 6 |
| 3 | Effect of chemical vapor infiltration treatment on the wave-absorbing performance of carbon fiber/cement composites显示文摘Short carbon fibers were treated at high temperatures around 1100°C through chemical vapor infiltration technology. A thinner layer of pyrocarbon was deposited on the fiber surface. The dispersion of carbon fibers in a cement matrix and the mechanical properties of carbon fiber/cement composites were investigated by scanning electron microscopy (SEM) and other tests. The reflec-tivity of electromagnetic waves by the composites was measured in the frequency range of 8.0-18 GHz for different carbon fiber contents of 0.2wt%, 0.4wt%, 0.6wt%, and 1.0wt%. The results show that the reflectivity tends to increase with the increase of fiber content above 0.4wt%. The minimum reflectivity is -19.3 dB and the composites exhibit wave-absorbing performances. After pyro-carbon is deposited on the fiber, all the reflectivity data are far greater. They are all above -10 dB and display mainly wave-reflecting performances. | Kezhi Li Chuang Wang Hejun Li Lingjun Guo Jihua Lu | 2008 | Journal of University of Science and Technology Beijing2008，15，6： | 4 |
| 4 | 'Investigation on Oxidation Products of UDMH under Normal Environmental Conditions' 显示文摘 | Guo Hejun Wang Xuanjun Yang Rong el al | 2003 | AIAA Technical Paper2003，，： | 1 |
| 5 | A New Diesel Oxygenate Additive and Its Effects on Engine Com- bustion and Emissions 显示文摘 | Gong Yarffeng Liu Shenghua Guo Hejun | 2007 | Applied Thermal Engineering2007，，27： | 1 |
| 6 | Development of Di-(2-Ethoxyethyl) carbonate as a clean diesel fuel additive 显示文摘 | Guo Hejun Liu Shenghua Zhou I_ongbao | 2006 | American Chemical Society Division of Fuel Chemistry2006，51，1： | 1 |
| 7 | Study on ethanol and ethylene glycol dimethyl ether blends ether blends as ox- ygenated diesel fuels 显示文摘 | Guo Hejun Zhen Li Liu Shenghua | 2006 | Division of Petroleum Chemistry2006，51，2： | 1 |
| 8 | Study on ethanol and ethylene glycol dimethyl ether blends as oxygenated diesel fuels显示文摘 | Guo Hejun Zhen Li Liu Shenghua | 2006 | American Chemical Society Division of Petroleum Chemistry2006，51，2： | 1 |
| 9 | A new diesel oxygenate additive and its effects on engine combus-- tion and emissions显示文摘 | Gong Yanfeng Liu Shenghua Guo Hejun | 2007 | Applied Thermal Engineering2007，27，1： | 1 |
| 10 | Strain rate - dependent compressive properties of C/C composites显示文摘 | Yuan Qinlu Li Yulong Li Hejun Li Shuping Guo Lingjun | 2008 | Materials Science and Engineering A2008，485，12： | 1 |
| 11 | Study on ethanol and ethylene glycol dimethyl ether blends ether blends as oxygenated diesel fuels显示文摘 | Guo Hejun Zhen Li Liu Shenghua | 2006 | Division of Petroleum Chemistry2006，51，2： | 1 |
| 12 | Study on ethanol and ethylene glycol dimethyl ether blends as oxygenated diesel fuels显示文摘 | Hejun Guo Li Zheng Shenghua Liu | 2006 | Prepr Pap-Am Chem Soc Div Fuel Chem2006，51，2： | 1 |
| 13 | A new diesel oxygenate additive and its effects on engine combustion and emissions显示文摘 | Gong Yanfeng Liu Shenghua Guo Hejun | 2007 | Applied Thermal Engineering2007，27，： | 1 |
| 14 | Research on a new type of oxygenate of 2-methoxy ethyl acetate as a clean diesel fuel additive 显示文摘 | Guo Hejun Huang Xianxiang Wang Xuanjun | 2004 | Preprint Papers-American Chemical Society Division of Petroleum Chemistry2004，49，2： | 1 |
| 15 | Research on a new kind of oxygenate used as a clean diesel fuel additive显示文摘 | Guo Hejun Huang Xianxiang Liu Shenghha | 2005 | Abstracts of Papers of the American Chemical Society2005，229，： | 1 |
| 16 | Development of di-(2-ethoxyethyl) carbonate as a clean diesel fuel additive 显示文摘 | Guo Hejun Liu Shenghua Zhou Longbao | 2006 | Preprint Papers-American Chemical Society Division of Petroleum Chemistry2006，51，1： | 1 |
| 17 | Advancement of a new acetate used as a clean oxygenated fuel for diesel engine 显示文摘 | Guo Hejun Huang Xianxiang Wang Xuanjun | 2006 | Preprint Papers-American Chemical Society Division of Fuel Chemistry2006，51，2： | 1 |
| 18 | Advancement of a new acetate used as a clean oxygenated fuel for diesel engine 显示文摘 | Guo Hejun Huang Xianxiang Wang Xuanjun | 2006 | Prepr Pap-Am Chem Soc Div Fuel Chem2006，51，2： | 1 |
| 19 | Influence of CVI treatment of carbon fibers on the electromagnetic interference of CFRC composites显示文摘 | Chuang Wang Kezhi Li Hejun Li Lingjun Guo Gengsheng Jiao | 2007 | Cement and Concrete Composites2007，，6： | 1 |
| 20 | Micro-and Nano-structure Characterization of Isotropic Pyrocarbon Obtained via Chemical Vapor Deposition in Hot Wall Reactor显示文摘The hot wall reactor was used to deposit isotropic pyrocarbon.The density of the product was measured by Archimedes method.The fracture morphology and texture of the product were investigated by scanning electron microscopy(SEM) and transmission electron microscopy(TEM).Raman spectroscopy was also applied to characterizing the structure of the product.The results show that the density of the product is about 1.31 g/cm3.The pyrocarbon consists of granular particles with the size of about 1.5 μm under SEM images.Under TEM images,the pyrocarbon is composed of irregular grains and onion-like particles are also detected.The orientation angle(180 deg.) of pyrocarbon reveals its isotropic character.The ID/IG ratio in Raman spectrum is about 1.2,indicating the isotropic feature of the product qualitatively. | Kezhi Li,Dongsheng Zhang,Lingjun Guo and Hejun Li State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi an 710072,China | 2010 | Journal of Materials Science & Technology2010，26，12： | 0 |
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