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Au atoms doped in Ti_(3)C_(2)T_(x)MXene:Benefiting recovery of oxygen vacancies towards photocatalytic aerobic oxidation

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Nano Research 2022年第4期15卷 2862-2869页

作者： Kaifu Yu Sanmei Wang Qi Li Tingting Hou Yue Xin Rong He Wenhua Zhang Shuquan Liang Liangbing Wang Wenkun Zhu State Key Laboratory of Environment-friendly Energy Materials National Co-innovation Center for Nuclear Waste Disposal and Environmental SafetySchool of National Defence Science&TechnologySouthwest University of Science and TechnologyMianyang 621010China State Key Laboratory for Powder Metallurgy Key Laboratory of Electronic Packing and Advanced Functional Materials of Hunan ProvinceSchool of Materials Science and EngineeringCentral South UniversityChangsha 410083China Hefei National Laboratory for Physical Sciences at the Microscale Synergetic Innovation Centre of Quantum Information&Quantum PhysicsCAS Key Laboratory of Materials for Energy ConversionUniversity of Science and Technology of ChinaHefei 230026China

Photocatalytic aerobic oxidation by using oxygen molecules(O_(2))as green and low-cost oxidants is of great attraction,where the introduction of irradiation has been proved as an efficient strategy to lower reaction temperature as well as promote catalytic ***,the oxygen vacancies(OVs)of catalyst are highly active sites to adsorb and activate O_(2)during photocatalytic aerobic ***,OVs are easily blocked by oxygen atoms from active oxygen species during the catalytic process,leading to the deactivation of ***,a promising catalyst toward photocatalytic aerobic oxidation was successfully developed by recovering the OVs through doping Au atoms into Ti_(3)C_(2)T_(x)MXene(Au/Ti_(3)C_(2)T_(x)).Impressively,Au/Ti_(3)C_(2)T_(x)exhibited remarkable activity under full-spectrum irradiation towards photooxidation of methyl phenyl sulfide(MPS)and methylene blue(MB),attaining a conversion of>90%at room ***,Au/Ti_(3)C_(2)T_(x)also manifested remarkable stability by maintaining>95%initial activity after 10 successive reaction *** mechanistic studies indicated that the OVs of Au/Ti_(3)C_(2)T_(x)served as the active centers to efficiently adsorb and activate O_(2).More importantly,the doped Au atoms of Au/Ti_(3)C_(2)T_(x)were conducive to the recovery of OVs during photocatalytic process from the results of theoretical and experimental *** recovered OVs of Au/Ti_(3)C_(2)T_(x)continuously and efficiently activated O_(2),directly contributing to the remarkable catalytic activity and stability.

关键词： oxygen vacancies doped Au atoms Ti_(3)C_(2)T_(x)MXene photocatalysis aerobic oxidation

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Recent Developments of Antimony-Based Anodes for Sodiumand Potassium-Ion Batteries

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Transactions of Tianjin University 2022年第1期28卷 6-32页

作者： Bochao Chen Ming Liang Qingzhao Wu Shan Zhu Naiqin Zhao Chunnian He School of Materials Science and Engineering Tianjin Key Laboratory of Composite and Functional MaterialsTianjin UniversityTianjin 300072China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityBinhai New CityFuzhou 350207China Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300072China Key Laboratory of Advanced Ceramics and Machining Technology Ministry of EducationTianjin UniversityTianjin 300072China

The development of sodium-ion(SIBs)and potassium-ion batteries(PIBs)has increased rapidly because of the abundant resources and cost-effectiveness of Na and ***(Sb)plays an important role in SIBs and PIBs because of its high theoretical capacity,proper working voltage,and low ***,Sb-based anodes have the drawbacks of large volume changes and weak charge transfer during the charge and discharge processes,thus leading to poor cycling and rapid capacity *** address such drawbacks,many strategies and a variety of Sb-based materials have been developed in recent *** review systematically introduces the recent research progress of a variety of Sb-based anodes for SIBs and PIBs from the perspective of composition selection,preparation technologies,structural characteristics,and energy storage ***,corresponding examples are presented to illustrate the advantages or disadvantages of these ***,we summarize the challenges of the development of Sb-based materials for Na/K-ion batteries and propose potential research directions for their further development.

关键词： Sodium-ion batteries Potassium-ion batteries Sb-based materials Energy storage

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Controllably Growing Topologies in One-shot RAFT Polymerization via Macro-latent Monomer Strategy

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Chinese Journal of Polymer science 2021年第1期39卷 60-69,I0006页

作者： Liu-Qiao Zhang Yang Gao Zhi-Hao Huang Wei Zhang Nian-Chen Zhou Zheng-Biao Zhang Xiu-Lin Zhu State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials Jiangsu Key Laboratory of Advanced Functional Polymer Design and ApplicationCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China Global Institute of Software Technology Suzhou 215163China

The controlled and efficient synthesis of polymers with tailored topologies is challenging but important for exploring structure/property research. Herein, we proposed a concept of macro-latent monomer to achieve the controlled growth of polymer *** macro-latent monomer was installed by a dynamic furan/maleimide covalent bond at the chain terminal. One-shot reversible additionfragmentation chain transfer(RAFT) polymerization of styrene and the macro-latent monomer created controlled growth of polymer *** temperature such as 40 ℃ could not activate the macro-latent monomer and thus the polymerization created the homo-polystyrene. By contrast, high temperature of ~110 ℃ activated the macro-latent monomer, and a maleimide-terminated macro-monomer was released via the retro-Diels Alder reaction. This macro-monomer immediately joined the cross polymerization with styrene and thus produced the side chains. By delicately manipulating the polymerization temperature, the predetermined placement of the macro-latent monomer-derived polymeric sidechains created controllably growing topologies, including star-, π-shaped, and density-variable grafting copolymers. This work paved a new way for creating on-demand topologies and would greatly enrich the topology synthesis.

关键词： Latent monomer Diels-Alder reaction Maleimide Styrene Topologies

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Transient NOE driven signal enhancement of INADEQUATE solid-state NMR spectroscopy for the structural analysis of rubbers

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Magnetic Resonance Letters 2024年第3期4卷 35-41页

作者： Zhiwei Yan Yue-Qi Ye Rongchun Zhang South China Advanced Institute for Soft Matter Science and Technology(AISMST) School of Emergent Soft Matter(SESM)South China University of TechnologyGuangzhou510640China JEOL(Beijing)Co. Ltd.Haidian DistrictBeijing100190China JEOL Ltd. MusashinoAkishimaTokyo196-8558Japan Guangdong Provincial Key Laboratory of Functional and Intelligent Hybrid Materials and Devices South China University of TechnologyGuangzhou510640China

INADEQUATE(Incredible Natural Abundance DoublE QUAntum Transfer Experiment)is one of the most important techniques in revealing the carbon skeleton of organic solids in solid-state NMR ***,its use for structural analysis is quite limited due to the low natural abundance of^(13)C-^(13)C connectivity(~0.01%)and thus low ***,in semi-solids like rubbers,the sensitivity will be further significantly reduced by the inefficient cross polarization from 1H to^(13)C due to molecular motions induced averaging of^(1)H-^(13)C dipolar ***,in this study,we demonstrate that transient nuclear Overhauser effect(NOE)can be used to efficiently enhance^(13)C signals,and thus enable rapid acquisition of two-dimensional(2D)^(13)C INADEQUATE spectra of *** chlorobutyl rubber as the model system,it is found that an overall signalto-noise ratio(SNR)enhancement about 22%can be achieved,leading to significant timesaving by about 33%as compared to the direct polarization-based INADEQUATE *** experimental results on natural rubber and ethylene propylene diene monomer(EPDM)rubber are also shown to demonstrate the robust performance of transient NOE enhanced INADEQUATE experiment.

关键词： Transient NOE INADEQUATE Carbon skeleton Rubbers

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Structure,electric,and dielectric properties of(Sr_(0.7)Ca_(0.3))_(1.02)(Zr_(0.95−x)Ti_(0.05)Mn_(x))O_(3+δ)ceramics for BME-MLCCs application

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Journal of advanced Ceramics 2024年第9期13卷 1382-1393页

作者： Qingyang Pang Ying Chen Zhixiang Wang Bin Zhou Xin Li Chao Mu Guangping Gu Genshui Wang Key Laboratory of Inorganic Functional Materials and Devices Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China National Key Laboratory of Materials for Integrated Circuits Shanghai Institute of Micro-system and Information TechnologyChinese Academy of SciencesShanghai 200050China Hangzhou Institute for Advanced Study University of Chinese Academy of SciencesHangzhou 310024China School of Chemistry and Materials Science Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou 310024China China Zhenhua Xinyun Electronic Components Co. Ltd.Guiyang 550018China

Zirconate-based dielectric ceramics are potential materials for base metal electrode multilayer ceramic capacitors(BME-MLCCs)due to their exceptional chemical and thermal stability,as well as excellent dielectric *** this work,(Sr_(0.7)Ca_(0.3))1.02(Zr_(0.95−x)Ti_(0.05)Mn_(x))O_(3)+δ(SCZTM,0≤x≤0.05)ceramics with two coexisting phases were prepared using a solidstate reaction method in a reducing *** study investigates the impact of Mn doping on sintering temperature,microstructure,and electrical properties of SCZTM *** doping can reduce the sintering temperature from 1450 to 1300℃.The impact of Mn doping on the structure and phonon vibration is minimal,resulting in a negligible effect on the intrinsic *** valence states of Mn ions and defects were characterized by X-ray photoelectron spectroscopy(XPS)and thermally stimulated depolarization current(TSDC)*** results demonstrate the significant role of Mn doping in nonintrinsic *** to the decrease in the concentration of oxygen vacancies(V_(O)),SCZTM(x=0.01)ceramics exhibit attractive properties:resistivity(ρ)=8.93×10^(14)Ω·cm,dielectric constant(ε_(r))=36.16,dielectric loss(tanδ)=2.43×10^(–4),temperature dependence of dielectric constant(τ_(ε))=15.44 ppm/℃(@−55–200℃,1 MHz),Q×f=30,257 GHz(@6.12 GHz),and temperature coefficient of resonant frequency(τf)=–9.9 ppm/℃.SCZTM(x=0.01)ceramic powders were used to successfully fabricate Ni-based multilayer ceramic capacitors(MLCCs)with a high insulation resistance of IR≥39.6 TΩ,an ultralow dielectric loss of tanδ=0.2×10^(–4),and a wide operating temperature range(temperature coefficient of capacitance(T_(cc))=10.88 ppm/℃,@−55–200℃,1 MHz).SCZTM ceramics exhibit properties that make them suitable for use as BMEMLCC materials with potential market applications.

关键词： dielectric properties reducing atmosphere defects multilayer structure

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Roll-to-roll fabrication of large-scale polyorgansiloxane thin film with high flexibility and ultra-efficient atomic oxygen resistance

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Plasma science and technology 2022年第6期24卷 173-181页

作者： Yi LI Zhonghua LI Detian LI Yanchun HE Shengzhu CAO Hu WANG Hengjiao GAO Hanjun HU Ying HE Yuan WANG Jun ZHU Science and Technology on Vacuum Technology and Physical Laboratory Lanzhou Institute of PhysicsChina Academy of Space TechnologyLanzhou 730000People's Republic of China School/Hospital of Stomatology School/Hospital of Stomatology Lanzhou University(Dental Hospital).Key Laboratory of Dental Maxillofacial Reconstruction and Biological Intelligence Manufacturing Gansu ProvinceSchool of StomatologyLanzhou UniversityLanzhou 730000People's Republic of China State Key Laboratory of Advanced Display Technology Special Display and Imaging Technology Innovation Center of Anhui ProvinceAnhui Provincial Key Laboratory of Advanced Functional Materials and DevicesAcademy of Opto-Electric TechnologyHefei University of TechnologyHefei 230009People's Republic of China

One of the most widely used and well-established atomic oxygen(AO)protection solutions for low Earth orbit(LEO)satellites is the deposition of protective coatings on polymeric ***,manufacturing extensive expanses of these coating materials with good transparency,flexibility,smoothness,ultra-thinness,and exceptional AO resistance remains a critical ***,we successfully deposited a 400 nm thick polyorgansiloxane(SiO_(x)C_(y)H_(z))coating with high optical transparency and uniform good adherence on to a 1.2 m wide polyimide surface,by optimizing the distribution of hexamethyldisiloxane and oxygen as precursors in the roll-to-roll compatible plasmaenhanced chemical vapor deposition *** AO irradiation with the fluence of 7.9×10^(20)atoms·cm^(–2),the erosion yield of the SiO_(x)C_(y)H_(z)-coated Kapton was less than 2.30×10^(–26)cm^3·atom^(–1),which was less than 0.77%of that of the *** indicates that the SiO_(x)C_(y)H_(z)coating can well prevent the erosion of Kapton by *** addition,it was also clarified that a SiO_(2) passivation layer was formed on the surface of the SiO_(x)C_(y)H_(z)coating during AO irradiation,which exhibited a‘self-reinforcing’defense *** entire preparation process of the SiO_(x)C_(y)H_(z)coating was highly efficient and low-cost,and it has shown great potential for applications in LEO.

关键词： plasma-enhanced chemical vapor deposition hexamethyldisiloxane polyorganosiloxane thin film flexibility atomic oxygen

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Deep-red and near-infrared organic lasers based on centrosymmetric molecules with excited-state intramolecular double proton transfer activity

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Opto-Electronic Advances 2023年第7期6卷 19-28页

作者： Chang-Cun Yan Zong-Lu Che Wan-Ying Yang Xue-Dong Wang Liang-Sheng Liao Macao Institute of Materials Science and Engineering Macao University of Science and TechnologyTaipaMacao SAR 999078China Institute of Functional Nano&Soft Materials Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesJoint International Research Laboratory of Carbon-Based Functional Materials and DevicesSoochow UniversitySuzhou 215123China Jiangsu Engineering Laboratory of Novel Functional Polymeric Materials Jiangsu Key Laboratory of Advanced Negative Carbon TechnologiesCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China.

Organic lasers that emit light in the deep-red and near-infrared(NIR)region are of essential importance in laser communication,night vision,bioimaging,and information-secured displays but are still challenging because of the lack of proper gain ***,a new molecular design strategy that operates by merging two excited-state intramolecular proton transfer-active molecules into one excited-state double proton transfer(ESDPT)-active molecule was *** on this new strategy,three new materials were designed and synthesized with two groups of intramolecular resonance-assisted hydrogen bonds,in which the ESDPT process was proven to proceed smoothly based on theoretical calculations and experimental results of steady-state and transient *** from the effective six-level system constructed by the ESDPT process,all newly designed materials showed low threshold laser emissions at approximately 720 nm when doped in PS microspheres,which in turn proved the existence of the second proton transfer *** importantly,our well-developed NIR organic lasers showed high laser stability,which can maintain high laser intensity after 12000 pulse lasing,which is essential in practical *** work provides a simple and effective method for the development of NIR organic gain materials and demonstrates the ESDPT mechanism for NIR lasing.

关键词： excited-state intramolecular proton transfer organic laser near-infrared emission molecular design

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Ion migration in halide perovskite solar cells:Mechanism,characterization,impact and suppression

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Journal of Energy Chemistry 2021年第12期30卷 528-549,I0013页

作者： Huachao Zai Yue Ma Qi Chen Huanping Zhou Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials Key Laboratory of Polymer Chemistry and Physics of Ministry of EducationBIC-ESATSchool of Materials Science and EngineeringPeking UniversityBeijing 100871China Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications Experimental Center of Advanced MaterialsSchool of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China

Metal halide perovskites are emerging as the most promising candidate for the next-generation Photovoltaics(PV)materials,due to their superior optoelectronic properties and low ***,the resulting Perovskite solar cells(PSCs)suffer from poor *** particular,the temperature and light activated ionic defects within the perovskite lattice,as well as electric-field-induced migration of ionic defects,make the PSCs unstable at operating condition,even with device *** is no doubt that the investigation of ion migration is crucial for the development of PSCs with high intrinsic *** this review,we first briefly introduce the origin and pathways of ion migration,and also the essential characterization methods to identify ion ***,we discuss the impact of ion migration on the perovskite films and cells with respect to photoelectric properties and ***,several representative strategies to suppress ion migration are systematically summarized in the context of composition engineering,additive engineering and interface engineering,with an in-depth understanding on the underlying mechanisms which may provide more clues for further fabrication of PSCs with improved ***,a perspective with some suggestion on future research directions and chemical approaches are provided to alleviate ion migration in perovskite materials and the entire devices.

关键词： Ion migration Perovskite Solar cell Defect Stability

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Status and challenges facing representative anode materials for rechargeable lithium batteries

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Journal of Energy Chemistry 2022年第3期31卷 260-294,I0008页

作者： Liqiang Zhang Chenxi Zhu Sicheng Yu Daohan Ge Haoshen Zhou Institute of Intelligent Flexible Mechatronics School of Mechanical EngineeringJiangsu UniversityZhenjiang 212013JiangsuChina Center of Energy Storage Materials&Technology College of Engineering and Applied SciencesJiangsu Key Laboratory of Artificial Functional MaterialsNational Laboratory of Solid State Microstructuresand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093JiangsuChina Energy Technology Research Institute National Institute of Advanced Industrial Science and Technology(AIST)Tsukuba 305-8568Japan

Rechargeable lithium batteries have been widely regarded as a revolutionary technology to store renewable energy sources and extensively researched in the recent several *** an indispensable part of lithium batteries,the evolution of anode materials has significantly promoted the development of lithium ***,since conventional lithium batteries with graphite anodes cannot meet the ever-increasing demands in different application scenarios(such as electric vehicles and large-scale power supplies)which require high energy/power density and long cycle life,various improvement strategies and alternative anode materials have been exploited for better electrochemical *** this review,we detailedly introduced the characteristics and challenges of four representative anode materials for rechargeable lithium batteries,including graphite,Li_(4)Ti_(5)O_(12),silicon,and lithium *** some of the latest advances are summarized,which mainly contain the modification strategies of anode materials and partially involve the optimization of electrode/electrolyte ***,we make the conclusive comments and perspectives,and draw a development timeline on the four anode *** review aims to offer a good primer for newcomers in the lithium battery field and benefit the structure and material design of anodes for advanced rechargeable lithium batteries in the future.

关键词： Lithium batteries Anode Graphite Li_(4)Ti_(5)O_(12) Silicon Silicon composite anode Lithium metal

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Molecular confined synthesis of magnetic CoO_(x)/Co/C hybrid catalyst for photocatalytic water oxidation and CO_(2)reduction

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Chinese Chemical Letters 2023年第12期34卷 328-332页

作者： Rui Li Chenchen Zhang Kejia You Bonan Li Wei Bu Xiangyu Meng Baochun Ma Yong Ding State Key Laboratory of Applied Organic Chemistry Key Laboratory of Advanced Catalysis of Gansu ProvinceCollege of Chemistry and Chemical EngineeringLanzhou UniversityLanzhou730000China State Key Laboratory for Oxo Synthesis and Selective Oxidation Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Henan Provincial Key Laboratory of Nanocomposites and Applications Institute of Nanostructured Functional MaterialsHuanghe Science and Technology CollegeZhengzhou450006China

Photosynthesis[6CO_(2)+12H_(2)O→(CH_(2)O)+6O_(2)+6H_(2)O]in nature contains a light reaction process for oxygen evolution and a dark reaction process for carbon dioxide(CO_(2))reduction to carbohydrates,which is of great significance for the survival of living ***,for simulating photosynthesis,it is desirable to design and fabricate a bifunctional catalyst for promoting photocatalytic water oxidation and CO_(2)reduction ***,a molecular confined synthesis strategy is reasonably proposed and applied,that is the bifunctional CoO_(x)/Co/C-T(T=700,800 and 900℃)photocatalysts prepared by the pyrolysis of molecular Co-EDTA under N_(2) and air atmosphere in *** the prepared photocatalysts,the CoOx/Co/C-800 shows the best photocatalytic water oxidation activity with an oxygen yield of 51.2%.In addition,for CO_(2)reduction reaction,the CO evolution rate of 12.6μmol/h and selectivity of 75%can be achieved over this *** improved photocatalytic activities are attributed to the rapid electron transfer between the photosensitizer and the catalyst,which is strongly supported by the current densityvoltage G-V,steady-state and time-resolved photoluminescence spectra(PL).Overall,this work provides a reference for the preparation and optimization of photocatalysts with the capacity for water oxidation and CO_(2)reduction reactions.

关键词： CoO_(x)/Co/C Water oxidation CO_(2)reduction Photocatalyst Photosensitizer

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