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Effect of slow monomer addition on molecular parameters of hyperbranched polymers synthesized in the presence of multifunctional core molecules

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science china {2. 2010年第4期53卷 891-897页

作者： zhou zhiping1, Jia ZhengWei1 & {2. deyue2.1school of materials science and engineering, jiangsu University, zhenjiang 2.2.13, china 2.tate Key Laboratory of Metal Matrix Composites, {12. jiao tong University, shanghai 2.02.0, china 1. school of materials {2. and engineering Jiangsu University Zhenjiang 212013 China2. State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai 200240 China

This study develops the kinetics for the slow monomer addition technique in the synthesis of hyperbranched polymers. Taking the conversion of monomer (x) as a variable, we derived the analytic expressions of molecular size distribution function, average degree of polymerization, polydispersity index and degree of branching. These expressions are not only amenable to the polymerization with high monomer conversion, but also appropriate to describe the whole polymerization process. Comparison with the one-pot polymerization indicates that the slow monomer addition technique improves the molecular weight distribution and increases the degree of branching for the products obtained.

关键词： hyperbranched polymer kinetics molecular weight distribution polydispersity degree of branching

Photo-responsive shape memory polymer composites enabled by doping with biomass-derived carbon nanomaterials

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Nano Research 2022年第2期15卷 1383-1392页

作者： Nina yan Zhiyu Zheng Yunliang Liu Xizhi Jiang Jiamin Wu Min Feng Lei Xu Qingbao Guan Haitao Li Institute of Agricultural Facilities and Equipment Jiangsu Academy of Agricultural SciencesKey Laboratory for Protected Agricultural Engineering in the Middle and Lower Reaches of Yangtze RiverMinistry of Agriculture and Rural AffairsNanjing 210014China Institute for Energy Research School of Chemistry and Chemical EngineeringJiangsu UniversityZhenjiang 212013China State Key Laboratory for Modification of chemical Fibers and Polymer materials International Joint Laboratory for Advanced Fiber and Low-dimension MaterialsCollege of Materials Science and EngineeringDonghua UniversityShanghai 201620China

As photothermal conversion agents,carbon nanomaterials are widely applied in polymers for light-triggered shape memory behaviors on account of their excellent light ***,they are usually derived from non-renewable fossil resources,which go against the demand for sustainable ***-derived carbon nanomaterials are expected as alternatives if they are designed with good dispersibility as well as splendid photothermal *** to date,very few researches focused on this ***,we report a novel light-triggered shape memory composite by incorporating renewable biomass-derived carbon nanomaterials into acrylate polymers without deep purification and *** functionalized carbon nanomaterials not only have stable dispersion in polymers as fillers,but also can endow the polymers with excellent and stable thermal and photothermal responsive properties in biological friendly *** the introduction of biomass-derived carbon nanomaterials,the mechanical properties of the composites are also further enhanced with the formation of hydrogen bonding between the carbon nanomaterials and the ***,the doping of 1%carbon nanomaterials endows the polymer with sufficient hydrogen bonds that not only exhibit excellent thermal and photothermal responsive properties,but also with enough space for the motion of *** properties make such composite a promising and safe candidate for shape memory applications,which provide a new avenue in smart fabrics or intelligent soft robotics.

关键词： biomass carbon nanomaterials shape memory polymers thermal responsive photothermal responsive

Hierarchical polypyrrole@cobalt sulfide-based flexible on-chip microsupercapacitors with ultrahigh energy density for selfcharging system

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Nano Research 2023年第1期16卷 555-563页

作者： yan Zhao Jihua Zheng Jing yang Wenjie Liu Fen Qiao Jiabiao Lian Guochun Li Tao Wang Jiangwei Zhang Limin Wu College of Energy Material and chemistry College of Chemistry and Chemical EngineeringInner Mongolia UniversityHohhot 010021China Institute for Energy Research School of Energy&Power EngineeringJiangsu UniversityZhenjiang 212013China Department of materials science Fudan UniversityShanghai 200433China Key Laboratory of Power Station Energy Transfer Conversion and System Ministry of EducationNorth China Electric Power UniversityBeijing 102206China

Herein,we prepare the unique hierarchical polypyrrole@cobalt sulfide(PPy-hs@CoS)hollow sphere-based nanofilms as interdigitated electrodes for flexible on-chip micro-supercapacitors(MSC).Benefiting from the excellent flexibility and high electrical conductivity of PPy-hs combined with the great electrochemical activity of CoS,such PPy-hs@CoS composite material can not only inhibit the volume expansion of PPy but also promote the diffusion of the electrolyte *** PPy-hs@CoS filmbased electrode delivers a greatly improved specific capacitance and small *** functional theory calculations infer that OH−prefers to bind to PPy on CoS@PPy and confirms the synergistic effect of each component for enhanced reaction kinetics.A quasi-solid-state on-chip flexible asymmetric MSC based on PPy-hs@CoS and activated carbon(AC)microelectrodes exhibits large areal-specific capacitance(131.9 mF/cm2.at 0.3 mA/cm2.,ultrahigh energy density(0.041 mWh/cm2.0.2.4 mW/cm2.and 2..6 mWh/cm3@140.6 mW/cm3),and long cycle *** demonstrate the possibility to scale up the PPy-hs@CoS nanofilm microelectrode by arranging two of our asymmetric MSC in series and parallel connections,which respectively increase the output voltage and current.A self-charging system by connecting our asymmetric MSCs with a piece of commercial solar cells is developed as a potential possible mode for future highly durable and high-voltage integrated electronics.

关键词： polypyrrole cobalt sulfide adsorption energy on-chip micro-supercapacitor self-charging device

Thermodynamics and kinetics of hydriding and dehydriding reactions in Mg-based hydrogen storage materials

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Journal of Magnesium and Alloys 2021年第6期9卷 1922-1941页

作者： Qian Li yangfan Lu Qun Luo Xiaohua yang yan yang Jun Tan Zhihua Dong Jie Dang Jianbo Li Yuan Chen Bin Jiang Shuhui Sun Fusheng Pan National engineering Research Center for Magnesium Alloys College of Materials Science and EngineeringChongqing UniversityChongqing 400044China State Key Laboratory of Mechanical Transmissions Chongqing UniversityChongqing 400044China State Key Laboratory of Advanced Special Steels Shanghai Key Laboratory of Advanced FerrometallurgySchool of Materials Science and EngineeringShanghai UniversityShanghai 200444China Institute of Quantum and Sustainable Technology(IQST) School of Chemistry and Chemical EngineeringJiangsu UniversityZhenjiang212013China Institut National de la Recherche Scientifique-énergie Matériaux et Télécommunications J3×1S2QuébecCanada

Mg-based materials are one of the most promising hydrogen storage candidates due to their high hydrogen storage capacity,environmental benignity,and high Clarke number ***,the limited thermodynamics and kinetic properties pose major challenges for their engineering ***,we review the recent progress in improving their thermodynamics and kinetics,with an emphasis on the models and the influence of various parameters in the calculated ***,the impact of alloying,composite,and nanocrystallization on both thermodynamics and dynamics are discussed in *** particular,the correlation between various modification strategies and the hydrogen capacity,dehydrogenation enthalpy and temperature,hydriding/dehydriding rates are *** addition,the mechanism of hydrogen storage processes of Mg-based materials is discussed from the aspect of classical kinetic theories and microscope hydrogen transferring *** review concludes with an outlook on the remaining challenge issues and prospects.

关键词： Magnesium-based hydrogen storage materials Hydriding/dehydriding reactions Thermodynamics Kinetic models Analysis methods

Hierarchically mesoporous carbon spheres coated with a single atomic Fe-N-C layer for balancing activity and mass transfer in fuel cells

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Carbon Energy 2022年第1期4卷 1-11页

作者： Chengyong Shu Qiang Tan Chengwei Deng Wei Du Zhuofan Gan yan Liu Chao Fan Hui Jin Wei Tang Xiao-dong yang Xiaohua yang Yuping Wu school of chemical {2. and Technology Xi'an Jiaotong UniversityXi'anChina State Key Laboratory for Mechanical Behavior of materials School of Material Science and EngineeringXi'an Jiaotong UniversityXi'anChina State Key Laboratory of Space Power-Sources Technology Shanghai Institute of Space Power SourcesShanghaiChina State Key Laboratory of Multiphase Flow in Power engineering Xi'an Jiaotong UniversityXi'anChina College of materials science and {2. Huaqiao UniversityXiamenChina Institute of Quantum and Sustainable Technology(IQST) School of Chemistry and Chemical EngineeringJiangsu UniversityZhenjiangChina State Key Laboratory of materials-Oriented chemical {2. School of Energy Science and Engineering and Institute of Advanced MaterialsNanjing Tech UniversityNanjingChina

Novel cost-effective fuel cells have become more attractive due to the demands for rare and expensive platinum-group metal(PGM)catalysts for mitigating the sluggish kinetics of the oxygen reduction reaction(ORR).The high-cost PGM catalyst in fuel cells can be replaced by earth-abundant transition-metalbased catalysts,that is,an Fe-N-C catalyst,which is considered one of the most promising ***,the performance of the Fe-N-C catalyst is hindered by the low catalytic activity and poor stability,which is caused by insufficient active sites and the lack of optimization of the triple-phase interface for mass ***,a novel Fe–N–C catalyst consisting of mono-dispersed hierarchically mesoporous carbon sphere cores and single Fe atom-dispersed functional shells are *** synergistic effect between highly dispersed Fe-active sites and well-organized porous structures yields the combination of high ORR activity and high mass transfer *** half-wave potential of the catalyst in 0.1M H_(2.SO_(4) is 0.82.V versus reversible hydrogen electrode,and the peak power density is 812.mW·cm^(−2. in H_(2.–O_(2. fuel ***,it shows superior methanol tolerance,which is almost immune to methanol poisoning and generates up to 162.mW·cm^(−2. power density in direct methanol fuel cells.

关键词： fuel cell hierarchically mesoporous carbon spheres oxygen reduction reaction single‐atom catalysts

Perovskite-based tandem solar cells

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science Bulletin 2021年第6期66卷 621-636,M0004页

作者： Zhimin Fang Qiang Zeng Chuantian Zuo Lixiu Zhang Hanrui Xiao Ming Cheng Feng Hao Qinye Bao Lixue Zhang Yongbo Yuan Wu-Qiang Wu Dewei Zhao Yuanhang Cheng Hairen Tan Zuo Xiao Shangfeng yang Fangyang Liu Zhiwen Jin Jinding yan Liming Ding Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China Hefei National Laboratory for Physical sciences at Microscale University of Science and Technology of ChinaHefei 230026China school of Metallurgy and Environment Central South UniversityChangsha 410083China Institute for Energy Research Jiangsu UniversityZhenjiang 212013China school of materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China school of Physics and Electronic science East China Normal UniversityShanghai 200241China school of chemistry and {2. engineering Qingdao UniversityQingdao 266071China school of Physics and Electronics Central South UniversityChangsha 410083China Key Laboratory of Bioinorganic and Synthetic chemistry(Ministry of Education) School of ChemistrySun Yat-sen UniversityGuangzhou 510275China Institute of Solar Energy materials and Devices College of Materials Science and EngineeringSichuan UniversityChengdu 610065China Solar Energy Research Institute of Singapore National University of SingaporeSingapore 117574Singapore College of engineering and Applied sciences Nanjing UniversityNanjing 210093China school of Physical science and Technology Lanzhou UniversityLanzhou 730000China High-Technology Research and Development Center(MoST) Beijing 100044China

The power conversion efficiency for single-junction solar cells is limited by the Shockley-Quiesser *** effective approach to realize high efficiency is to develop multi-junction *** years have witnessed the rapid development of organic–inorganic perovskite solar *** excellent optoelectronic properties and tunable bandgaps of perovskite materials make them potential candidates for developing tandem solar cells,by combining with silicon,Cu(In,Ga)Se_(2.and organic solar *** this review,we present the recent progress of perovskite-based tandem solar cells,including perovskite/silicon,perovskite/perovskite,perovskite/Cu(In,Ga)Se_(2.,and perovskite/organic ***,the challenges and opportunities for perovskite-based tandem solar cells are discussed.

关键词： Tandem solar cells Perovskite Silicon CIGS Organic