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A Bifunctional-Modulated Conformal Li/Mn-Rich Layered Cathode for Fast-Charging,High Volumetric density and Durable Li-Ion Full Cells

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Nano-Micro Letters 2021年第8期13卷 40-55页

作者： Zedong zhao Minqiang Sun Tianqi Wu Jiajia Zhang Peng Wang Long Zhang Chongyang Yang Chengxin Peng Hongbin lu state key laboratory of molecular Engineering of polymers Department of Macromolecular ScienceCollaborative Innovation Center of Polymers and Polymer CompositesFudan University2005 Songhu RoadShanghai 200438People’s Republic of China School of Materials science&Engineering University of Shanghai for Science and TechnologyShanghai 200093People’s Republic of China National Engineering Research center for Supercapacitor for Vehicles Shanghai Aowei Technology Development Co.LtdShanghai 201203People’s Republic of China key laboratory of Advanced Energy Materials chemistry(Ministry of Education) College of ChemistryNankai UniversityTianjin 300071People’s Republic of China

Lithium-and manganese-rich(LMR)layered cathode materials hold the great promise in designing the next-generation high energy density lithium ion ***,due to the severe surface phase transformation and structure collapse,stabilizing LMR to suppress capacity fade has been a critical ***,a bifunctional strategy that integrates the advantages of surface modification and structural design is proposed to address the above issues.A model compound Li_(1.2)Mn_(0.54)Ni_(0.13)Co_(0.13)O_(2)(MNC)with semi-hollow microsphere structure is synthesized,of which the surface is modified by surface-treated layer and graphene/car-bon nanotube dual *** unique structure design enabled high tap density(2.1 g cm^(−3))and bidirectional ion diffusion *** dual surface coatings covalent bonded with MNC via C-O-M linkage greatly improves charge transfer efficiency and mitigates electrode *** to the synergistic effect,the obtained MNC cathode is highly conformal with durable structure integrity,exhibiting high volumetric energy density(2234 Wh L^(−1))and predominant capacitive *** assembled full cell,with nanograph-ite as the anode,reveals an energy density of 526.5 Wh kg^(−1),good rate performance(70.3%retention at 20 C)and long cycle life(1000 cycles).The strategy presented in this work may shed light on designing other high-performance energy devices.

关键词： Lithium-and manganese-rich layered cathode Semi-hollow microspheres Volumetric energy density Conformal structure Full cell

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Chlorinated Effects of Double-Cable Conjugated polymers on the Photovoltaic Performance in Single-Component Organic Solar Cells

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高分子科学：英文版 2023年第2期41卷 187-193页

作者： Han-Yi Bao zhao-Fan Yang Yan-Jiao zhao Xiang Gao Xin-Zhu Tong Yi-Nuo Wang Feng-Bo Sun Jian-Hong Gao Wei-Wei Li Zhi-Tian Liu Hubei Engineering Technology Research center of Optoelectronic and New Energy Materials Hubei Key Laboratory of Plasma Chemistry and Advanced MaterialsSchool of Materials Science and EngineeringWuhan Institute of TechnologyWuhan430205China beijing Advanced Innovation center for Soft Matter science and Engineering&state key laboratory of Organic-Inorganic Composite Beijing University of Chemical TechnologyBeijing100029China

The recently emerged double-cable conjugated polymers have come into focus due to their significantly improved power conversion efficiencies (PCEs) in single-component organic solar cells (SCOSCs). In this work, the effect of chlorination in double-cable conjugated polymers with linear benzodithiophene backbone and pendant perylene bisimide on the photovoltaic performance in SCOSCs has been studied. After introducing chlorine atoms into conjugated side chains, the highest occupied molecular orbital level of the conjugated polymers is down-shifted, thus resulting in a higher open-circuit voltage. As a result, the chlorinated double-cable conjugated polymer exhibits improved photovoltaic performance from 3.46% to 3.57%.

关键词： Double-cable conjugated polymer Chlorination Single-component organic solar cells

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Cyclic oligourea synthesized from CO_(2):Purification,characterization and properties

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Green Energy & Environment 2022年第3期7卷 477-484页

作者： Ruhui Shi Haiyang Cheng Hongxiang Li Peixuan Wu Chao Zhang Masahiko Arai Fengyu zhao state key laboratory of Electroanalytical chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesNo.5625 Renmin Rd.Changchun130022China University of science and Technology of china No.96 Jinzhai Rd.Hefei230026China Jilin Province key laboratory of Green chemistry and Process Changchun Institute of Applied ChemistryChinese Academy of SciencesNo.5625 Renmin Rd.Changchun130022China state key laboratory of polymer physics and chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesNo.5625 Renmin Rd.Changchun130022China

Carbon dioxide(CO_(2)) as a sustainable resource instead of toxic reagents has attracted considerable attention in synthesis of chemicals and polymeric ***,a kind of cyclic oligourea was synthesized via polycondensation of CO_(2) with 4,7,10-trioxa-1,13-tridecanediamine(TTD)followed by effective separation and purification *** developed an efficient separation strategy in which the linear oligourea molecules were selectively transformed to macromolecular polyurea molecules by a reaction of the–NH_(2) end group with 4,4’-diphenylmethane diisocyanate(MDI),followed by separation from cyclic oligourea using selected *** structure and physicochemical properties were confirmed by MALDI-TOF mass spectra,NMR,Cryo-EM,thermal analysis and solubility *** well-defined cyclic oligourea was produced with a high purity(99.4%)and the average-number molecular weight(Mn)of 1040 *** is semi-crystalline in structure with a melting point of 106℃and glass transition point of-10℃.The cyclic oligourea presented characteristically difference to its linear *** work provides a new member to cyclic polymer family.

关键词： materials separation purity

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High-performance and multifunctional organic field-effect transistors

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中国化学快报:英文版 2023年第9期34卷 100-118页

作者： Yujie zhao Wei Wang Zihan He Boyu Peng Chong-An Di Hanying Li MOE key laboratory of Macromolecular Synthesis and Functionalization International Research Center for X PolymersDepartment of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China beijing National laboratory for molecular sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical sciences University of Chinese Academy of SciencesBeijing 100049China

Organic field-effect transistors(OFETs)refer to field-effect transistors that use organic semiconductors as channel *** to the advantages of organic materials such as solution processability and intrinsic flexibility,OFETs are expected to be applicable in emergent technologies including wearable electronics and sensors,flexible displays,internet-of-things,neuromorphic computing,*** the electrical performance and developing multifunctionalities of OFETs are two major and closely relevant aspects for OFETs-related *** former one aims for investigating the device physics and expanding the horizons of OFETs,while the later one is critical for leading OFETs into practical and emergent *** development in each of the two aspects would undoubtfully promote the other and bring more confidence for future development of ***,this review is divided into two parts that respectively summarize the recent progress in high-performance OFETs and multifunctional OFETs.

关键词： Organic filed-effect transistors Organic semiconductors High-performance Multifunctionality Organic electronics

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Ni助剂对Co/AC催化CO加氢制高碳醇性能的影响

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分子科学学报 2024年第1期40卷 33-38页

作者：吴桐赵子昂李怡蕙朱何俊李阳王加升包明丁云杰大连理工大学化工学院精细化工国家重点实验室辽宁大连116024 中国科学院大连化学物理研究所洁净能源国家实验室(筹)辽宁大连116023 中国科学院大学北京100049 中国科学院大连化学物理研究所催化基础国家重点实验室辽宁大连116023

研究了Ni助剂对于调变Co/AC催化剂表面富碳缺氢化学环境的作用,考察了Ni掺杂对CO加氢反应性能的影响。采用物理吸附、程序升温还原、化学吸附、高分辨透射电子显微镜(HRTEM)、X-射线衍射(XRD)和X-射线光电子能谱(XPS)对催化剂进行了表... 详细信息

研究了Ni助剂对于调变Co/AC催化剂表面富碳缺氢化学环境的作用,考察了Ni掺杂对CO加氢反应性能的影响。采用物理吸附、程序升温还原、化学吸附、高分辨透射电子显微镜(HRTEM)、X-射线衍射(XRD)和X-射线光电子能谱(XPS)对催化剂进行了表征。结果表明Co/AC催化剂中掺杂Ni助剂后,随着Ni助剂质量分数由0%增加至3%,C6+高碳醇在醇类产物的分布由31.3%提高至51.7%。Ni掺杂为促进高碳醇的醇分布提供了新思路。

关键词： CO加氢 Co/AC催化剂高碳醇 Ni掺杂

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Stress-induced Solid-Solid Crystal Transition in Trans-1,4-polyisoprene

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chinese Journal of polymer science 2022年第3期40卷 256-265,I0006页

作者： Chun-Bo Zhang Lei Wang Bo Yang Hui zhao Guo-Ming Liu Du-Jin Wang Shenzhen key laboratory of polymer science and Technology College of Materials Science and EngineeringShenzhen UniversityShenzhen 518060China CAS key laboratory of Engineering Plastics Beijing National Laboratory for Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China University of chinese academy of sciences Beijing 100049China School of Materials science&Engineering Beijing Institute of Fashion TechnologyBeijing 100029China

The polymorphic transition of trans-1,4-polyisoprene(TPI) during stretching was investigated by in situ wide-angle X-ray diffraction and Fourier transform infrared spectroscopy. The influences of the initial structure, stretching temperature, and strain rate on the contents of different crystal modifications(α, β) were explored. The results confirm that the α-β transition occurs during stretching of TPI that only contains αcrystal(α-TPI). When the stress is relaxed, the β crystal formed during stretching remains, which indicates that the transition is irreversible. On the other hand, stretching of TPI that only contains β crystal(β-TPI) results in orientated β crystal. No β-α transition occurs during stretching. The different structures of stretched α-TPI and β-TPI exclude the previously proposed "melting-recrystallization mechanism". The α-β transition depends significantly on temperature and strain rate, indicating the transition is governed both by thermodynamics and kinetics. Our results support a solid-solid transition mechanism rather than a melting-recrystallization mechanism. The irreversible nature of the transition is attributed to the metastability of the β phase in the unstretched state. Different from the "β phases" that appear in polymers with stress-induced reversible transitions, e.g. poly(butylene terephthalate) and poly(butylene succinate), the stability of β phase in TPI is high that can be *** strain rate dependence of α-β transition hinders the determination of critical stress for the transition. It further indicates that the local stress within the sample is more heterogeneous at higher strain rates.

关键词： Trans-1 4-polyisoprene Crystal transition deformation Crystallization

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High-yield and low-cost separation of high-purity semiconducting single-walled carbon nanotubes with closed-loop recycling of raw materials and solvents

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Nano Research 2021年第11期14卷 4281-4287页

作者： Fang Liu Xingxing Chen Haoming Liu Jie zhao Meiqi Xi Hongshan Xiao Tongkang lu Yu Cao Yan Li Lianmao Peng Xuelei Liang center for Carbon-Based Electronics Peking UniversityBeijing100871China key laboratory for the physics and chemistry of Nanodevices Department of ElectronicsPeking UniversityBeijing100871China College of chemistry and molecular Engineering Peking UniversityBeijing100871China Shanxi institute for Carbon-Based Thin Film Electronics Peking University(SICTFE-PKU)Taiyuan030012China Taiyuan laboratory for Carbon-Based Thin Film Electronics Taiyuan030012China

Semiconducting single-walled carbon nanotubes (s-SWCNTs) are the foundation of CNT-based electronics and optoelectronics. For practical applications, s-SWCNTs should be produced with high purity, high structural quality, low cost, and high yield. Currently conjugated polymer wrapping method shows great potential to fulfill these requirements due to its advantages of simple operation process, high purity separation, and easy scaling-up. However, only a small portion of both CNTs and polymers go into the final solution, and most of them are discarded after a single use, resulting in high cost and low yield. In this paper, we introduce a closed-loop recycling strategy, in which raw materials (CNTs and polymers) and solvents were all recycled and reused for multiple separation cycles. In each cycle, high-purity (> 99.9%) s-SWCNTs were obtained with no significant change of structural quality. After 7 times of recycling and separation, the material cost was reduced to ∼ 1% in comparison with commercially available products, and total yield was increased to 36% in comparison with 2%–5% for single cycle separation. Our proposed closed-loop recycling strategy paves the way for low-cost and high-yield mass production of high-quality s-SWCNTs.

关键词： carbon nanotubes closed-loop recycling high-yield low-cost high purity

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Perylene Diimide-Based Oligomers and polymers for Organic Optoelectronics

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Accounts of Materials Research 2022年第3期3卷 309-318页

作者： Pei Cheng Xingang zhao Xiaowei Zhan key laboratory of polymer chemistry and physics of Ministry of Education School of Materials Science and EngineeringPeking UniversityBeijing 100871China College of polymer science and Engineering State Key Laboratory of Polymer Material and EngineeringSichuan UniversityChengdu 610065China key laboratory of Eco-functional polymer Materials of Ministry of Education College of Chemistry and Chemical EngineeringNorthwest Normal UniversityLanzhou 730070China

CONSPECTUS:Perylene diimide(PDI)as a classical dye has some advantages,such as structural diversity,tunable optical and electronic properties,strong light absorption,high electron affinity,and good electron-transporting properties and *** PDI-based oligomers and polymers are good candidates for n-type semiconductors in organic electronics and photonic devices.A polymer solar cell(PSC)that converts sunlight into electricity is a promising renewable and clean energy technology and has some superiorities,such as simple preparation and being lightweight,low cost,semitransparent,and *** a long time,fullerene derivatives(e.g.,PCBM)have been the most important electron acceptors used in the active layer of ***,PCBM suffers from some disadvantages,for example,weak absorption,a large amount of energy loss,and unstable *** to PCBM,PDI-based materials present some advantages:intense visible-light absorption;lowest unoccupied molecular orbital(luMO)energy levels can be modulated to achieve a suitable charge separation driving force and high open-circuit voltage(V_(OC));and the molecular configuration can be adjusted to achieve morphology ***,PDI-based oligomers and polymers are widely used as electron acceptors in the active layer of *** addition,PDI-based oligomers and polymers are widely used as n-type semiconductors in other electronic and photonic devices,such as organic field-effect transistors(OFETs),light-emitting diodes,lasers,optical switches,and photodetectors.

关键词： stability absorption separation

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Bulk growth and separation of single-walled carbon nanotubes from rhenium catalyst

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Nano Research 2022年第7期15卷 5775-5780页

作者： Chen Ma Yumin Liu Lili Zhang Liu Qian Yiming zhao Ying Tian Qianru Wu Dong Li Nan zhao Xueting Zhang Liantao Xin Huaping Liu Pengxiang Hou Chang Liu Maoshuai He Jin Zhang state key laboratory of Eco-Chemical Engineering Ministry of EducationTaishan Scholar Advantage and Characteristic Discipline Team of EcoChemical Process and TechnologyCollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China beijing National laboratory for Condensed Matter physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Shenyang National laboratory for Materials science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China center for Nanochemistry Beijing Science and Engineering Center for NanocarbonsBeijing National Laboratory for Molecular SciencesCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China School of science Dalian Maritime UniversityDalian 116026China

Bulk synthesis of single-walled carbon nanotubes(SWNTs)using solid catalyst has been challenging,despite of recent breakthrough in the chirality-specific growth on the flat substrate *** this work,we propose a porous magnesia support rhenium catalyst for bulk synthesis of *** is found that the well-dispersed catalyst with a high melting point and the optimal chemical vapor deposition reaction conditions account for the growth of *** characterizations reveal the produced SWNTs are dominant in(n,n−1)and(n,n−2)***,by using a multicolumn chromatography post-growth separation method,SWNTs with three defined diameter ranges were *** work guides the design of porous oxide supported catalyst for bulk synthesis and diameter-dependent sorting of SWNTs,which will ultimately help harness the extraordinary properties of SWNTs.

关键词： single-walled carbon nanotube rhenium catalyst bulk growth gel chromatography diameter separation

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Chemoselective polymerization of Fully Biorenewableα-Methylene-γ-Butyrolactone Using Organophosphazene/Urea Binary Catalysts Toward Sustainable Polyesters

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CCS chemistry 2021年第1期3卷 620-630页

作者： Yong Shen Wei Xiong Yongzheng Li Zhichao zhao Hua lu Zhibo Li state key laboratory Base of Eco-Chemical Engineering College of Chemical EngineeringQingdao University of Science and TechnologyQingdao 266042 key laboratory of Biobased polymer Materials Shandong Provincial Education DepartmentCollege of Polymer Science and EngineeringQingdao University of Science and TechnologyQingdao 266042 beijing National laboratory for molecular sciences Center for Soft Matter Science and EngineeringKey Laboratory of Polymer Chemistry and Physics of Ministry of EducationCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871

despite the great potential of biorenewableα-methylene-γ-butyrolactone(MBL)to produce functional,recyclable polyester,the ring-opening polymerization(ROP)of MBL remains a challenge due to the competing polymerization of the highly reactive exocyclic double bond and low-strained five-membered *** this contribution,we present the first organocatalytic chemoselective ROP of MBL to exclusively produce functional unsaturated polyester by utilizing a phosphazene base/urea binary *** show that delicate chemoselectivity can be realized by controlling the temperature and using selected urea *** obtained polyester can be completely recycled back to its monomer by chemolysis under mild *** and theoretical calculations provide mechanistic insights and indicate that the ROP pathway is kinetically favored by using urea with stronger acidity at low temperatures.

关键词： organocatalyst ring-opening polymerization polyester sustainable polymer recyclability

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