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Nano-silica modified lightweight and high-toughness carbon fiber/phenolic ablator with excellent thermal insulation and ablation performance

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Defence Technology（防务技术） 2024年第1期31卷 192-199页

作者： Wenjie Xu Wenda Song Xianfeng Jia Cheng Ma Jitong Wang Wenming Qiao licheng ling State Key Laboratory of Chemical Engineering East China University of Science and TechnologyShanghai 200237China School of Chemical Engineering and Materials Changzhou Institute of TechnologyChangzhou 213032China Key Laboratory of Specially Functional Polymeric Materials and Related Technology(Ministry of Education) School of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China

Lightweight and high-toughness carbon fiber/phenolic ablator(CFPA)is required as the Thermal Protection System(TPS)material of aerospace vehicles for next-generation space *** improve the ablative properties,silica sol with good particle size distribution prepared using tetramethoxysilane(TMOS)was blended with natural rubber latex and deposited onto carbon fiber felt,which was then integrated with phenolic aerogel matrix,introducing nano-silica into the framework of *** modified CFPA with a low density of 0.28—0.31 g/cm3exhibits strain-in-fracture as high as 31.2%and thermal conductivity as low as 0.054 W/(m·K).Furthermore,a trace amount of nano-silica could effectively protect CFPA from erosion of oxidizing atmosphere in different high-temperature *** oxyacetylene ablation test of 3000°C for 20 s shows a mass ablation rate of 0.0225 g/s,a linear ablation rate of 0.209 mm/s for the modified CFPA,which are 9.64%and 24.82%lower than the unmodified ***,the long-time butane ablation test of 1200°C for 200 s shows an insignificant recession with mass and linear ablation rate of 0.079 g/s and 0.039 mm/s,16.84%and 13.33%lower than the unmodified ***,the fixed thermocouple in the test also demonstrates a good thermal insulation performance with a low peak back-face temperature of 207.7°C,12.25%lower than the unmodified ***,the nano-silica modified CFPA with excellent overall performance presents promising prospects in high-temperature aerospace applications.

关键词： Nano-silica Carbonfiber Phenolic aerogel Insulation Ablation

Carbon dioxide capture using polyethylenimine-loaded mesoporous carbons

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Journal of Environmental Sciences 2013年第1期25卷 124-132页

作者： Jitong Wang Huichao Chen Huanhuan Zhou Xiaojun Liu Wenming Qiao Donghui Long licheng ling State Key Laboratory of Chemical Engineering East China University of Science and Technology

A high efficiency sorbent for CO2 capture was developed by loading polyethylenimine （PEI） on mesoporous carbons which possessed well-developed mesoporous structures and large pore volume. The physicochemical properties of the sorbent were characterized by N2 adsorption/desorption, scanning electron microscopy （SEM）, thermal gravimetric analysis （TG） and Fourier transform infrared spectroscopy （FT-IR） techniques followed by testing for CO2 capture. Factors that affected the sorption capacity of the sorbent were studied. The sorbent exhibited extraordinary capture capacity with CO2 concentration ranging from 5% to 80%. The optimal PEI loading was determined to be 65 wt.% with a CO2 sorption capacity of 4.82 mmol-CO2/g-sorbent in 15% CO2/N2 at 75℃, owing to low mass-transfer resistance and a high utilization ratio of the amine compound （63%）. Moisture had a promoting effect on the sorption separation of CO2. In addition, the developed sorbent could be regenerated easily at 100℃, and it exhibited excellent regenerability and stability. These results indicate that this PEI-loaded mesoporous carbon sorbent should have a good potential for CO2 capture in the future.

关键词： carbon dioxide capture polyethylenimine mesoporous carbon amine utilization ratio

Electron delocalization-enhanced sulfur reduction kinetics on an MXene-derived heterostructured electrocatalyst

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Nano Research 2024年第8期17卷 7153-7162页

作者： Yunmeng Li Yinze Zuo Xiang Li Yongzheng Zhang Cheng Ma Xiaomin Cheng Jian Wang Jitong Wang Hongzhen Lin licheng ling State Key Laboratory of Chemical Engineering Key Laboratory of Specially Functional Polymeric Materials and Related Technology(Ministry of Education)East China University of Science and TechnologyShanghai 200237China Institute of New Energy Materials and Engineering College of Materials Science and EngineeringFuzhou UniversityFuzhou 350108China Key Laboratory of Specially Functional Polymeric Materials and Related Technology(Ministry of Education) School of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China i-Lab&CAS Key Laboratory of Nanophotonic Materials and Device Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of SciencesSuzhou 215123China Helmholtz Institute Ulm(HIU) D89081 UlmGermany

Lithium-sulfur(Li-S)batteries mainly rely on the reversible electrochemical reaction of between lithium ions(Li^(+))and sulfur species to achieve energy storage and conversion,therefore,increasing the number of free Li^(+)and improving the Li^(+)diffusion kinetics will effectively enhance the cell ***,Mo-based MXene heterostructure(MoS_(2)@Mo_(2)C)was developed by partial vulcanization of Mo_(2)C MXene,in which the introduction of similar valence S into Mo-based MXene(Mo_(2)C)can create an electron delocalization *** theoretical simulations and electrochemical characterisation,it is demonstrated that the MoS_(2)@Mo_(2)C heterojunction can effectively promote ion desolvation,increase the amount of free Li^(+),and accelerate Li^(+)transport for more efficient polysulfide *** addition,the MoS_(2)@Mo_(2)C material is also capable of accelerating the oxidation and reduction of polysulfides through its sufficient defects and vacancies to further enhance the catalytic ***,the Li-S battery with the designed MoS_(2)@Mo_(2)C electrocatalyst performed for 500 cycles at 1 C and still maintained the ideal capacity(664.7 mAh·g^(−1)),and excellent rate performance(567.6 mAh·g^(−1)at 5 C).Under the extreme conditions of high loading,the cell maintained an excellent capacity of 775.6 mAh·g^(−1)after 100 *** also retained 838.4 mAh·g^(−1)for 70 cycles at a low temperature of 0℃,and demonstrated a low decay rate(0.063%).These results indicate that the delocalized electrons effectively accelerate the catalytic conversion of lithium polysulfide,which is more practical for enhancing the behaviour of Li-S batteries.

关键词： delocalized electron lithium sulfur batteries MXene-based heterostructures catalytic desolvation multi-catalytic sites

Interface engineering of MXene-based heterostructures for lithiumsulfur batteries

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Nano Research 2023年第7期16卷 9158-9178页

作者： Siyu Wu Xiang Li Yongzheng Zhang Qinghua Guan Jian Wang Chunyin Shen Hongzhen Lin Jitong Wang Yanli Wang Liang Zhan licheng ling State Key Laboratory of Chemical Engineering East China University of Science and Technology130 Meilong RoadShanghai 200237China Key Laboratory of Specially Functional Polymeric Materials and Related Technology(Ministry of Education) School of Chemical EngineeringEast China University of Science and Technology130 Meilong RoadShanghai 200237China i-Lab&CAS Key Laboratory of Nanophotonic Materials and Devices Suzhou Institute of Nano-tech and Nano-bionicsChinese Academy of SciencesSuzhou 215123China Helmholtz Institute Ulm(HIU) Ulm D89081Germany

High energy density and low cost make lithium-sulfur(Li-S)batteries as one of the next generation's promising energy storage ***,the following problems need to be solved before commercialization:(i)the shuttling effect and sluggish redox kinetics of lithium polysulfides in sulfur cathode;(ii)the formation of lithium dendrites and the crack of solid electrolyte interphase;(iii)the large volume changes during charge and discharge ***,as newly emerging two-dimensional transition metal carbides/nitrides/carbonitrides,have attracted widespread attention due to their abundant active surface terminals,adjustable vacancies,and high electrical *** MXene-based heterogeneous structures is expected to solve the stacking problem induced by hydrogen bonds or Van der Waals force and to provide other charming physiochemical ***,we generalize the design principles of MXene-based heterostructures and their functions,i.e.,adsorption and catalysis in advanced conversion-based Li-S ***,the physiochemical properties of MXene and MXene-based heterostructures are briefly ***,the catalytic functions of MXene-based heterostructures with the compositional constituents including carbon materials,metal compounds,organic frameworks,polymers,single atoms and special high-entropy MXenes are comprehensively summarized in sulfur cathodes and lithium ***,the challenges of MXene-based heterostructure in current Li-S batteries are pointed out and we also provide some enlightenments for future developments in high-energy-density Li-S batteries.

关键词： MXene heterostructures lithium-sulfur battery shuttle effect interface engineering

外加电压对沥青碳纤维/ABS树脂复合材料导电性的影响

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复合材料学报 2001年第2期18卷 14-17页

作者：梁晓怿凌立成吕春祥刘朗中国科学院山西煤炭化学研究所太原030001 中国科学院山西煤炭化学研究所煤转化国家重点实验室太原030001

通用级沥青碳纤维与 ABS树脂通过单螺杆挤出机共混后模压成型 ,所制复合材料的电阻率随材料中纤维添加量的增多而迅速降低。当复合材料中纤维添加量较少时 ,材料的电流电压关系不满足欧姆定律所描述的线性关系 ,材料电阻随外电压的增大... 详细信息

通用级沥青碳纤维与 ABS树脂通过单螺杆挤出机共混后模压成型 ,所制复合材料的电阻率随材料中纤维添加量的增多而迅速降低。当复合材料中纤维添加量较少时 ,材料的电流电压关系不满足欧姆定律所描述的线性关系 ,材料电阻随外电压的增大而减小。随着纤维含量的增加 ,材料电流电压关系的线性度逐渐增大。当纤维含量达到 40 wt%时 ,材料电阻不随外电压的增大而变化 ,材料满足欧姆定律。经外加高电压处理后 ,材料电阻率发生永久性降低 ,其电流电压关系的线性度提高。

关键词： ABS树脂复合材料导电性外加电压沥青碳纤维隧道跃迁理论

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乙烯渣油结构解析及其热解行为

石油学报（石油加工） 2014年第6期30卷 1052-1058页

作者：葛传长龙东辉乔文明凌立成华东理工大学化学工程联合国家重点实验室上海200237

以乙烯渣油为原料,采用1 H-NMR、13 C-NMR表征渣油组分中各类型H、C的分布,并联合基质辅助激光解吸电离飞行时间质谱、元素分析设计了乙烯渣油的平均分子结构模型,同时采用热重技术研究了其热稳定和热反应性,利用管弹式反应器研究了乙... 详细信息

以乙烯渣油为原料,采用1 H-NMR、13 C-NMR表征渣油组分中各类型H、C的分布,并联合基质辅助激光解吸电离飞行时间质谱、元素分析设计了乙烯渣油的平均分子结构模型,同时采用热重技术研究了其热稳定和热反应性,利用管弹式反应器研究了乙烯渣油在320℃、350℃和420℃N2保护下的热转化反应特征。结果表明,乙烯渣油的平均相对分子质量约为247,芳香度为0.76,平均分子结构中烷基侧链与环烷结构并存;当温度为320℃和350℃时,乙烯渣油的热转化以裂解反应为主,产物主要为轻质油和气体,无焦生成,且液相产物芳香度随温度升高逐渐增大;而温度为420℃时,缩聚反应加剧并有固体焦生成,液相产物芳香H(C)与脂肪H(C)的原子比也随之升高。

关键词：乙烯渣油平均分子结构热稳定热解行为机理

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超级活性炭的制备和结构及其性能研究进展

煤炭转化 2001年第2期24卷 27-31页

作者：宋燕凌立成等中国科学院山西煤炭化学研究所煤转化国家重点实验室，太原030001

超级活性炭是一种新型高效吸附功能材料，由于它具有比表面积高、微孔分布集中且吸附性能优良等特点，正越来越广泛地受到重视并在许多领域推广,概述了超级活性炭的制备、结构及其性能研究进展。

关键词：超级活性炭比表面积化学活化法孔结构表面化学结构吸附性能

二茂铁的添加对酚醛树脂基球形活性炭活化特性以及孔径分布的影响

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离子交换与吸附 2000年第2期16卷 155-161页

作者：杨骏兵凌立成吕春祥刘朗煤转化国家重点实验室!太原030001 中国科学院山西煤炭化学研究所!太原030001

通过在酚醛树脂中添加有机金属二茂铁的方法，制备出含有大量中孔的酚醛树脂基球形活性炭（ＰＨＳＡＣ）。结果表明，添加二茂铁有助于酚醛树脂基球形炭的均匀活化和提高其活化速率．不添加二茂铁的酚醛树脂基球形活性炭是典型的微孔活... 详细信息

通过在酚醛树脂中添加有机金属二茂铁的方法，制备出含有大量中孔的酚醛树脂基球形活性炭（ＰＨＳＡＣ）。结果表明，添加二茂铁有助于酚醛树脂基球形炭的均匀活化和提高其活化速率．不添加二茂铁的酚醛树脂基球形活性炭是典型的微孔活性炭，而添加了二茂铁的酚醛树脂基球形活性炭不但含有微孔，而且含有３～５ｎｍ和１０～９０ｎｍ的中孔。

关键词：酚醛树脂基球形活性炭二茂铁孔径分布

利用聚合物共混法对活性炭材料的孔径分布进行控制的原理和方法

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材料导报 2000年第4期14卷 48-50,29页

作者：杨骏兵凌立成刘朗中国科学院山西煤炭化学研究所太原030001 中国科学院山西煤炭化学研究所煤转化国家重点实验室太原030001

在母体聚合物中引入的作为造孔剂的聚合物在碳化期间完全分解,从而在碳基体中留下大量的孔隙。通过添加不同种类的聚合物,可以控制活性炭材料的孔径分布。综述了利用这种方法对活性炭材料的孔径分布进行控制的原理和方法,并介绍了这方... 详细信息

在母体聚合物中引入的作为造孔剂的聚合物在碳化期间完全分解,从而在碳基体中留下大量的孔隙。通过添加不同种类的聚合物,可以控制活性炭材料的孔径分布。综述了利用这种方法对活性炭材料的孔径分布进行控制的原理和方法,并介绍了这方面的研究进展。

关键词：聚合物共混法活性炭材料孔径分布控制