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Over 18% binary organic solar cells enabled by isomerization of non-fullerene acceptors with alkylthiophene side chains

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Science china chemistry 2022年第9期65卷 1758-1766页

作者： Ao shang Siwei Luo Jianquan Zhang heng Zhao Xinxin Xia Mingao Pan Chao li Yuzhong chen Jicheng Yi Xinhui Lu Wei ma he Yan Huawei Hu State Key Laboratory for Modification of chemical Fibers and Polymer materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China Department of chemistry Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional MaterialsEnergy Institute and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and ReconstructionHong Kong University of Science and TechnologyClear Water BayKowloonHong Kong 999077China State Key Laboratory for Mechanical Behavior of materials Xi’an Jiaotong UniversityXi’an 710049China Department of Physics Chinese University of Hong KongNew TerritoriesHong Kong 999077China Institute of Polymer Optoelectronic materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhou 510640China

Side-chain engineering has been demonstrated as an effective method for fine-tuning the optical,electrical,and morphological properties of organic semiconductors toward efficient organic solar cells(OSCs).In this work,three isomeric non-fullerene small molecule acceptors(Smas),named as BTP-4F-T2C8,BTP-4F-T2EH and BTP-4F-T3EH,with linear and branched alkyl chains substituted on the α or β positions of thiophene as the side chains,were synthesized and systematically *** results demonstrate that the size and substitution position of alkyl side chains can greatly affect the electronic properties,molecular packing as well as crystallinity of the *** blending with donor polymer D18-Cl,the prominent device performance of 18.25% was achieved by the BTP-4F-T3EH-based solar cells,which is higher than those of the BTP-4F-T2EH-based(17.41%)and BTP-4F-T2C8-based(15.92%)*** enhanced performance of the BTP-4F-T3EH-based devices is attributed to its stronger crystallinity,higher electron mobility,suppressed bimolecular recombination,and the appropriate intermolecular interaction with the donor *** work reveals that the side chain isomerization strategy can be a practical way in tuning the molecular packing and blend morphology for improving the performance of organic solar cells.

关键词： organic solar cells non-fullerene acceptors side chain isomerization morphology intermolecular interaction

Preparation of WO_(3) nanorods with high specific surface area using double-walled carbon nanotubes as template

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Rare Metals 2022年第3期41卷 1051-1056页

作者： Yan-Hong Yin Chun-An ma Zi-Ping wu li-Tao chen You-Qun Chu State Key Laboratory Breeding Base for Green chemistry Synthesis Technology International Science and Technology Cooperation Base of Energy Materials and ApplicationCollege of Chemical Engineering and Materials ScienceZhejiang University of TechnologyHangzhou 310032China engineering Research Center of High-Efﬁciency Development and Application Technology of Tungsten Resources(Ministry of Education) School of Materials Science and EngineeringJiangxi University of Science and TechnologyGanzhou 341000China

The preparation of WO_(3) nanorods by double-walled carbon nanotube(DWCNT)template was investi-gated in this *** to that the prepared H_(2)WO_(4)can be isolated by the homogenously dispersed DWCNT bun-dles and secondary accumulation can be avoided effec-tively,the growth of H_(2)WO_(4) can be restrained,and H_(2)WO_(4) nanorods with diameter of 10–50 nm can be *** calcination of the prepared DWCNT/H_(2)WO_(4) com-posite in oxygen,WO_(3) nanorods with diameter of 10–100 nm and high specific surface area of 16.4 m^(2)·g^(-1) can be *** is concluded that the DWCNTs play an im-portant role in the effective mediation of the morphology and size of nano-WO_(3).

关键词： Tungsten oxide Nanorods Double-walled carbon nanotubes Template

An upgraded polymeric composite with interparticle chemical bonding microstructure toward lithium-ion battery separators with enhanced safety and electrochemical performances

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能源化学:英文版 2023年第9期84卷 402-413页

作者： Qian Zhao ling ma Ye Xu Xiulong wu Shuai Jiang Qiaotian Zheng Guang Hong Bin he chen li Wanglai Cen Wenjun Zhou Yan Meng Dan Xiao college of Mechanical engineering Chengdu UniversityChengdu 610106SichuanChina Institute for Advanced Study Chengdu UniversityChengdu 610106SichuanChina Chongqing Academy of Metrology and Quality Inspection Chongqing 401121China Institute of New Energy and Low-Carbon Technology Sichuan UniversityChengdu 610065SichuanChina

A composite separator of SiC/PVDF-HFP was synthesized for lithium-ion batteries with high thermal and mechanical *** from the nanoscale,high hardness,and melting point of SiC,SiC/PVDFHFP with highly uniform microstructure was *** polarization caused by barrier penetration was significantly *** to the Si-F bond between SiC and PVDF-HFP,the structural stability has been obviously enhanced,which could suppress the growth of lithium(li) ***,some 3D reticulated Si nanowires are found on the surface of li anode,which also greatly inhibit li dendrites and result in irregular flakes of li ***,the shrinkage of 6% SiC/PVDF-HFP at 150℃ is only 5%,which is notably lower than those of PVDF-HFP and *** commercial liFePO_(4) cell assembled with 6% SiC/PVDF-HFP possesses a specific capacity of 157.8 ma h g^(-1) and coulomb efficiency of 98% at 80℃.In addition,the tensile strength and modulus of 6% SiC/PVDF-HFP could reach 14.6 and 562 MPa,*** a small deformation(1000 nm) and strong deformation recovery are obtained under a high additional load(2.3 mN).Compared with PVDF-HFP and Celgard2500,the symmetric li cell assembled with 6% SiC/PVDF-HFP has not polarized after 900 cycles due to its excellent mechanical *** strategy provides a feasible solution for the composite separator of high-safety batteries with a high temperature and impact resistance.

关键词： SiC PVDF-HFP Composite separator Thermal stability Mechanical stability High safety battery

A 2D covalent organic framework with ultra-large interlayer distance as high-rate anode material for lithium-ion batteries

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Nano Research 2022年第11期15卷 9779-9784页

作者： manman wu Yang Zhao Hongtao Zhang Jie Zhu Yanfeng ma chenxi li Yamin Zhang Yongsheng chen The Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer materials Institute of Polymer ChemistryCollege of ChemistryNankai UniversityTianjin 300071China State Key Laboratory of Elemento-Organic chemistry Nankai UniversityTianjin 300071China Renewable Energy Conversion and Storage Center(RECAST) Nankai UniversityTianjin 300071China State Key Laboratory of Applied Organic chemistry College of Chemistry and Chemical EngineeringLanzhou UniversityLanzhou 730000China

Covalent organic frameworks(COFs)have been broadly investigated for energy storage ***,many COF-based anode materials suffer from low utilization of redox-active sites and sluggish ions/electrons transport caused by their densely stacked ***,it is still a great challenge to obtain COF-based anode materials with fast ions/electrons transport and thus superior rate ***,a redox-active piperazine-terephthalaldehyde(PA-TA)COF with ultra-large interlayer distance is designed and synthesized for high-rate anode material,which contains piperazine units adopting a chair-shaped conformation with the nonplanar linkages of a tetrahedral *** unique structure renders PA-TA COF an ultra-large interlayer distance of 6.2Å,and further enables it to achieve outstanding rate and cycling *** a high specific capacity of 543 mah·g^(−1) even after 400 cycles at 1.0 A·g^(−1),it still could afford a specific capacity of 207 mah·g^(−1) even at a high current density of 5.0 A·g^(−1).Our study indicates that expanding the interlayer distance of COFs by rational molecular design would be of great importance to develop high-rate electrode materials for lithium-ion batteries.

关键词： lithium-ion batteries high-rate anode material covalent organic frameworks ultra-large interlayer distance

Advanced lanthanide doped upconversion nanomaterials for lasing emission

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Journal of Rare Earths 2022年第5期40卷 687-695,I0001页

作者： Yunfei shang Tong chen Tianhui ma Shuwei Hao Weiqiang Lv Dechang Jia Chunhui Yang School of materials Science and engineering Harbin Institute of TechnologyHarbin 150001China MIIT Key Laboratory of Critical materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001China college of materials and chemical engineering Heilongjiang Institute of TechnologyHarbin 150050China State Key Laboratory of Urban Water Resource and Environment Harbin Institute of TechnologyHarbin 150001China Yangtze Delta Region Institute(Huzhou)&School of Physics University of Electronic Science and Technology of ChinaHuzhou 313001China

Microlasers are narrow-band and coherent light from small cavities,which have been widely applied in biomedicine,optical interconnection,integration devices,*** doped upconversion materials are potential gain media for microlasers from near infrared(NIR)to visible and UV regimes due to their multi ladder-like metastable energy levels and superior optical frequency conversion *** optical feedback from photon scattering of the porous upconversion nanoparticles clusters has been reported to produce upconversion random *** light bouncing back and forth between two reflective surfaces or internal surface has been utilized to achieve modulated upconversion lasing *** addition,photon lattices and plasmonic cavities with enhanced electromagnetic fields can amplify the upconversion process within the sub-diffraction volumes and produce highly efficient upconverting *** this review,the recent advances on using lanthanide doped upconversion materials for random,whispering gallery mode(WGM)/Fabry-Perot(FP)cavity and photon lattice/plasmonic cavity modulated upconversion microlasers are *** challenges and future directions of the upconverting lasers are also discussed.

关键词： Lanthanide Upconversion Microlaser Microcavity Rare earths

Approaching the uniaxiality of magnetic anisotropy in singlemolecule magnets

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Science china chemistry 2023年第3期66卷 683-702页

作者： chen Wang Yin-Shan Meng shang-Da Jiang Bing-wu Wang Song Gao School of chemistry Chemical Engineering and Life ScienceWuhan University of TechnologyWuhan 430070China Beijing National Laboratory of Molecular Science Beijing Key Laboratory for Magnetoeletric Materials and DevicesCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China State Key Laboratory of Fine chemicals Dalian University of TechnologyDalian 116024China Spin-X Institute School of Chemistry and Chemical EngineeringState Key Laboratory of Luminescent Materials and DevicesGuangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional MaterialsSouth China University of TechnologyGuangzhou 510641China

Single-molecule magnets(SMMs),which can exhibit slow magnetization relaxation and bulk-magnet-like hysteresis of purely molecular origin,are promising candidates for high-density information storage,molecular spintronics,and quantum *** realize their applications,it is crucial to improve the blocking temperature(TB)and the effective relaxation barrier(Ueff).Three decades of multidisciplinary research have yielded distinct SMMs with a state-of-the-art Ueff of up to 2,000 K and a TB of up to the liquid nitrogen *** strategies have been investigated and summarized,which revealed that enhancing the uniaxiality of magnetic anisotropy is critical for constructing high-performance ***,magnetic anisotropy,a key property that connects the molecular structure symmetry and performance of SMMs,plays a fundamental role in dictating magneto-structural *** and employing magnetic anisotropy would be significantly beneficial for rationally designing high-performance *** review focuses on the magnetic anisotropy of *** illustrate the origin and manifestation of magnetic anisotropy in mononuclear 3d-and 4f-block metal *** then introduce developed approaches to investigate magnetic anisotropy both theoretically and *** SMMs by optimizing uniaxial magnetic anisotropy through lanthanide metallocene,symmetry controlling,and low-coordination approaches are ***,the remaining challenges and opportunities in this field will be discussed.

关键词： single-molecule magnets magnetic anisotropy uniaxiality lanthanide

One-Pot Hydrothermal Synthesis and Photocatalytic Hydrogen Evolution of Pyrochlore Type K_(2)Nb_(2)O_(6)

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Chinese Journal of chemistry 2014年第6期32卷 485-490页

作者： Jingjing wu Chao Zhou Yufei Zhao Lu shang Tong Bian Lei Shao Feng Shi li-Zhu wu chen-Ho Tung Tierui Zhang college of chemical engineering Research Center of the Ministry of Education for High Gravity Engineering&TechnologyBeijing University of Chemical TechnologyBeijing 100029China Key Laboratory of Photochemical Conversion and Optoelectronic materials Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China State Key Laboratory of chemical Resource engineering and Key Laboratory of Carbon Fibers and Functional Polymers Ministry of EducationBeijing University of Chemical TechnologyBeijing 100029China

A novel K_(2)Nb_(2)O_(6)photocatalyst with pyrochlore structure has been synthesized via a facile one-pot hydrother-mal route with no aid of *** as-prepared samples were characterized by powder X-ray diffraction,ultra-violet-visible spectroscopy and field emission scanning electron *** photocatalytic H_(2)evolution was performed in an aqueous methanol solution under UV light *** as-prepared K_(2)Nb_(2)O_(6)photocatalyst with pyrochlore structure showed higher H_(2)production activity than that of perovskite KNbO_(3)and commercial Nb2O5 powders in the absence of cocatalysts,due mainly to its unique crystal and energy band *** rate of H_(2)evolution can be significantly enhanced by loading of Pt *** highest H_(2)evolution rate of 121μmol/h was reached when 0.7 wt%Pt nanoparticles were used,which was about 20 times higher than that of pristine K_(2)Nb_(2)O_(6).

关键词： hydrothermal synthesis photolysis water splitting K_(2)Nb_(2)O_(6) pyrochlore

注水开发中悬浮物粒径与储层孔隙结构匹配关系

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西安石油大学学报（自然科学版） 2024年第2期39卷 47-54页

作者：秦立峰吴绍伟马雪琼卢辰白玉震苏碧云中海石油(中国)有限公司湛江分公司广东湛江524057 西安石油大学化学化工学院陕西西安710065

为了完善注水开发中悬浮物粒径中值指标制定方法,以南海西部涠洲油田群为例,在统计大量数据的基础上,分析主力生产层位岩石孔隙结构参数与渗透率之间的关系(R_(c)-K);通过室内岩心驱替实验对油田群原有注水指标进行优化,得出渗透率与粒... 详细信息

为了完善注水开发中悬浮物粒径中值指标制定方法,以南海西部涠洲油田群为例,在统计大量数据的基础上,分析主力生产层位岩石孔隙结构参数与渗透率之间的关系(R_(c)-K);通过室内岩心驱替实验对油田群原有注水指标进行优化,得出渗透率与粒径中值的关系(K-d);关联R_(c)-K方程以及K-d关系后,得到不同岩心级别下注入水悬浮物粒径中值与喉道直径的匹配关系(d/2Rc)。结果表明:以渗透率保留率80%为标准,K=(10~50)×10^(-3)μm^(2)时颗粒粒径中值与喉道直径比d/2R_(c)=1/6;K=(50~100)×10^(-3)μm^(2)时d/2R_(c)=1/5;K=(100~300)×10^(-3)μm^(2)时d/2R_(c)=1/5。

关键词：匹配关系悬浮物粒径中值储层孔隙结构岩心渗透率注水水质

Synergistic effect of V and Fe in Ni/Fe/V ternary layered double hydroxides for efficient and durable oxygen evolution reaction

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Frontiers of chemical Science and engineering 2023年第1期17卷 102-115页

作者： lihong chen Ruxin Deng Shaoshi Guo Zihuan Yu Huiqin Yao Zhenglong wu Keren Shi Huifeng li Shulan ma Beijing Key Laboratory of Energy Conversion and Storage materials College of ChemistryBeijing Normal UniversityBeijing 100875China School of Basic Medical Sciences Ningxia Medical UniversityYinchuan 750004China Analytical and Testing Center Beijing Normal UniversityBeijing 100875China State Key Laboratory of High-efficiency Utilization of Coal and Green chemical engineering Ningxia UniversityYinchuan 750021China

High-performance and stable electrocatalysts are vital for the oxygen evolution reaction(OER).herein,via a one-pot hydrothermal method,Ni/Fe/V ternary layered double hydroxides(NiFeV-LDH)derived from Ni foam are fabricated to work as highly active and durable electrocatalysts for *** changing the feeding ratio of Fe and V salts,the prepared ternary hydroxides were *** an Fe:V ratio of 0.5:0.5,NiFeV-LDH exhibits outstanding OER activity superior to that of the binary hydroxides,requiring overpotentials of 269 and 274 mV at 50 ma·cm^(−2)in the linear sweep voltammetry and sampled current voltammetry measurements,***,NiFeV-LDH shows extraordinary long-term stability(≥75 h)at an extremely high current density of 200 ma·cm^(−2).In contrast,the binary hydroxides present quick decay at 200 ma·cm^(−2)or even reduced current densities(150 and 100 ma·cm^(−2)).The outstanding OER performance of NiFeV-LDH benefits from the synergistic effect of V and Fe while doping the third metal into bimetallic hydroxide layers:(a)Fe plays a crucial role as the active site;(b)electron-withdrawing V stabilizes the high valence state of Fe,thus accelerating the OER process;(c)V further offers great stabilization for the formed intermediate of FeOOH,thus achieving superior durability.

关键词： oxygen evolution reaction electrocatalysts ternary layered double hydroxides long-term stability