检索结果-南通市图书馆

Reinforcing epoxy resin with nitrogen doped carbon nanotube:A potential lightweight structure material

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2018年第11期34卷 2205-2211页

作者： Qi Wang Guodong Wen Junnan Chen dang sheng su School of Materials Science and Engineering University of Science and Technology of China Institute of Metal Research Chinese Academy of Sciences

The outstanding mechanical properties of nanocarbon materials, especially carbon nanotube（CNT）, make them one of the most promising reinforcing nanofillers for the high-performance lightweight structural material. However, the complicated but not eco-friendly surface functionalization processes（e.g. HNO3 oxidation） are generally necessary to help disperse nanocarbon materials into epoxy or build chemical bonds between them. Herein, nitrogen doped carbon nanotube（NCNT） was used to replace CNT to reinforce the epoxy resin, and the mechanical properties of the NCNT/epoxy nanocomposite showed significant superiorities over the CNT/epoxy nanocomposites. The fabrication process was simple and environmentally friendly, and avoided complicated, polluting and energy intensive surface functionalization processes. Moreover, the NCNT/epoxy suspension exhibited a relative low viscosity, which was favorable for the subsequent application. The reinforcing mechanism of NCNT was also proposed. The present work gives out an easy solution to the preparation of a high-performance nanocomposite as a potential lightweight structure material.

关键词： Epoxy-matric nanocomposite Nitrogen doped carbon nanotube NCNT/epoxy Mechanical properties Toughness

Palladium and carbon synergistically catalyzed room-temperature hydrodeoxygenation(HDO) of vanillyl alcohol–A typical lignin model molecule

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2017年第1期26卷 8-16页

作者： Qi Wang Neeraj Gupta Guodong Wen Sharifah Bee Abd Hamid dang sheng su School of Materials Science and Engineering University of Science and Technology of China Institute of Metal Research Chinese Academy of Sciences Nanotechnology & Catalysis Research Centre (NANOCAT) University of Malaya IPS Building

Vanillyl alcohol, which is made up of an aromatic ring, an alcoholic hydroxyl group, a phenolic hydroxyl group and a methoxy group, was selected as the model molecule of lignin. Various carbon materials supported Pd catalysts were chosen to catalyze the HDO of vanillyl alcohol. The catalysts were characterized via TEM, TPD, XRD, XPS and CO-chemisorption. It was found that different carbon materials could obviously influence the particle sizes, dispersion and distribution of Pd or PdO particles. Palladium and carbon can synergistically catalyze the room-temperature HDO of vanillyl alcohol even at room temperature, and the carboxyl group was found to be the effective active acid site during the reaction. Possible reaction mechanism was also proposed. The existence of the effective active acid sites on the carbon supports could obviously lower the reaction temperature without decreasing the selectivity, as a result, making the production of renewable fuels by HDO much more economically feasible, which is of much importance. © 2016 Science Press

关键词： Bioconversion Carbon Catalysts Dispersions Molecules Palladium

A perspective on carbon materials for future energy application

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2013年第2期22卷 151-173页

作者： dang sheng su Gabriele Centi Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Dipartimento di Ingegneria Elettronica Chimica ed Ingegneria Industriale University of Messina and INSTM/CASPE (Laboratory of Catalysis for Sustainable Production and Energy) V. le F. Stagno D'Alcontres 31 98166 Messina Italy

Nanocarbon materials play a critical role in the development of new or improved technologies and devices for sustainable production and use of renewable energy. This perspective paper defines some of the trends and outlooks in this exciting area, with the effort of evidencing some of the possibilities offered from the growing level of knowledge, as testified from the exponentially rising number of publications, and putting bases for a more rational design of these nanomaterials. The basic members of the new carbon family are fullerene, graphene, and carbon nanotube. Derived from them are carbon quantum dots, nanohorn, nanofiber, nano ribbon, nanocapsulate, nanocage and other nanomorphologies. Second generation nanocarbons are those which have been modified by surface functionalization or doping with heteroatoms to create specific tailored properties. The third generation of nanocarbons is the nanoarchitectured supramolecular hybrids or composites of the first and second genera- tion nanocarbons, or with organic or inorganic species. The advantages of the new carbon materials, relating to the field of sustainable energy, are discussed, evidencing the unique properties that they offer for developing next generation solar devices and energy storage solutions.

关键词： nanocarbon CNT graphene hybrid carbon materials sustainable energy energy storage and conversion solar cells Li-batteries supercapac-itors

Preface to Special Issue on Carbon Materials for Energy Application

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2013年第2期22卷 I0001-I0001页

The rising cost and limited availability of fossil fuels, and the increasing concerns related to their role on global pollution and greenhouse effect have pushed considerably the need to accelerate the transition to a more sustainable use of energy based largely on renewable energy sources. Nanocarbon materials play a critical role in this transition, as they are the key materials for components of different devices necessary in enabling this transition （batteries, fuel cells, solar cells, etc.）. This issue collects 22 contributions, including one perspective and six review papers on the topic of carbon materials for energy applications, written by well-known experts in this field. It is really an exciting special issue that gives a very updated view of this topic, as well as trends and outlooks in this breakthrough research area. The initial perspective paper introduces the different possibilities offered from the growing level of knowledge in this area, testified from the exponentially rising number of publications. It also discusses the basie concepts for a rational design of these nanomaterials. The lk）llowing six reviews address different specific aspects of synthesis, characterization and use of carbon nanomaterials, from fuel cells to composite electrodes, supercapacitors and photoelectrochemical devices for CO2 conversion. These reviews represent an unique opportunity for the readers to be updated on the latest developments of new carbon families such as fullerene, grapbene, and carbon nanotube, and their derived nanocarbon materials （from carbon quantum dots to nanohorn, nanofiber, nano ribbon, etc.）. Second generation nanocarbons, including modification of these nanocarbons by surface functionalization or doping with heteroatoms to create specific tailored properties, and nanoarchitectured supramolecular hybrids, are also discussed. Finally, 1 communication and 14 full articles discuss several aspects of the use of these nanocarbon materials to develop

关键词： Preface to Special Issue on Carbon Materials for Energy Application

Carboxyl groups trigger the activity of carbon nanotube catalysts for the oxygen reduction reaction and agar conversion

在线全文

学校读者我要写书评

暂无评论

Nano Research 2015年第2期8卷 502-511页

作者： Yexin Zhang Chunlin Chen Lixia Peng Zhongsen Ma Yajie Zhang Hengheng Xia Aili Yang Lei Wang dang sheng su Jian Zhang Ningbo Institute of Materials Technology & Engineering Chinese Academy of Sciences Ningbo 315201 China Science and Technology on surface Physics and Chemistry Laboratory Mianyang 621907 China Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

Ozone treatment is a common way to functionalize commercial multi-walled carbon nanotubes （CNTs） with various oxygen functionalities like carboxyl, phenol and lactone groups, in order to enhance their textural properties and chemical activity. In order to detail the effect of each functional group, we correlated the activity with the surface density of each group, and found that the carboxyl groups play a pivotal role in two important catalytic reactions, namely the electrochemical oxygen reduction reaction （ORR） and agar conversion to 5-hydroxymethylfurfural （HMF）. During the processes, the hydrophilic surface provides a strong affinity for reaction substrates while the improved porosity allows the efficient diffusion of reactants and products. Furthermore, the activity of functionalized CNTs for agar conversion remained almost unchanged during nine cycles of reaction. This work highlights a strategy for improving the activity of CNTs for electrochemical ORR and agar conversion reactions, as well a promising application of carboxyl-rich CNTs as a solid acid catalyst to produce high-purity HMF--an important chemical intermediate.

关键词： carbon nanotubes functionalization carboxyl group oxygen reduction reaction biomass conversion

Carbon Catalysis: Potential and Challenges

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Carbon Catalysis: Potential and Challenges

Porous V_2O_5-SnO_2 /CNTs composites as high performance cathode materials for lithium-ion batteries

第十四届全国催化学术会议

作者： dang sheng su Fritz Haber Institute of the Max Planck Society

＜正＞Carbon is traditionally used as catalyst-support in catalysis,but new more research works have been performed to use carbon materials as（metal-free）*** this presentation,we discuss the applications of nanocarbon as high-performance catalyst for dehydrogenation and selective oxidation *** of ethylbenzene to form styrene is an important industrial processes and it has recently been demonstrated that various sp2 based carbon such as mesoporous carbons,nanofilaments,carbon nanotubes and onion like carbon materials are active as catalysts for this *** carbon based catalysts represent an environmentally friendly alternative

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2013年第2期22卷 347-355页

作者： Qi Guo Zhenhua sun Man Gao Zhi Tan Bingsen Zhang dang sheng su Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences

Vanadium pentoxide （V205） exhibits high theoretical capacities when used as a cathode in lithium ion batteries （LIBs）, but its application is limited by its structural instability as well as its low lithium and electronic conductivities. A porous composite of V2Os-SnO2/carbon nanotubes （CNTs） was prepared by a hydrothermal method and followed by thermal treatment. The small particles of V205, their porous structure and the coexistence of SnO2 and CNTs can all facilitate the diffusion rates of the electrons and lithium ions. Electrochemical impedance spectra indicated higher ionic and electric conductivities, as compared to commercial V205. The VzOs-SnOz/CNTs composite gave a reversible discharge capacity of 198 mAh.g- 1 at the voltage range of 2.05-4.0 V, measured at a current rate of 200 mA.g-1, while that of the commercial V205 was only 88 mAh.g-1, demonstrating that the porous V2Os-SnOz/CNTs composite is a promising candidate for high-performance lithium secondary batteries.

关键词： lithium-ion battery cathode vanadium oxide carbon nanotube electrochemical energy storage

Ru/FeO_x catalyst performance design: Highly dispersed Ru species for selective carbon dioxide hydrogenation

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Catalysis 2018年第1期39卷 157-166页

作者： Di Zhang Jingjie Luo Jiajie Wang Xin Xiao Yuefeng Liu Wei Qi dang sheng su Wei Chu Department of Chemical Engineering & Institute of New Energy and Low Carbon Technology Sichuan University Chengdu 610065 Sichuang China Shenyang National Laboratory for Materials Science (SYNL) Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 LiaoningChina Dalian National Laboratory for Clean Energy (DNL) Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 Liaoning China

A series of Ru/FeOx catalysts were synthesized for the selective hydrogenation of CO2to *** characterizations of the catalysts through X‐ray diffraction,X‐ray photoelectron spectroscopy,transmission electron microscopy,and temperature‐programmed techniques were performed to directly monitor the surface chemical properties and the catalytic performance to elucidate the reaction *** dispersed Ru species were observed on the surface of FeOx regardless of the initial Ru *** the Ru loading resulted in changes to the Ru coverage over the FeOx surface,which had a significant impact on the interaction between Ru and adsorbed H,and concomitantly,the H2activation capacity via the ability for *** having0.01%of Ru loading exhibited100%selectivity toward CO resulting from the very strong interaction between Ru and adsorbed H,which limits the desorption of the activated H species and hinders over‐reduction of CO to *** increasing the Ru loading of the catalysts to above0.01%resulted in the adsorbed H to be easily dissociated,as a result of a weaker interaction with Ru,which allowed excessive CO reduction to produce *** how to selectively design the catalyst by tuning the initial loading of the active phase has broader implications on the design of supported metal catalysts toward preparing liquid fuels from CO2.?2018,Dalian Institute of Chemical Physics,Chinese Academy of Sciences toward preparing liquid fuels from CO2.?2018,Dalian Institute of Chemical Physics,Chinese Academy of *** by Elsevier *** rights reserved.

关键词： Highly dispersed Ru/FeOx catalyst Temperature‐programmed surface reaction CO2 selective hydrogenation Product selectivity Hydrogen adsorption

延展适用于电化学氧还原反应的旋转环盘电极的分析方法（英文）

在线全文

学校读者我要写书评

暂无评论

延展适用于电化学氧还原反应的旋转环盘电极的分析方法（英文）