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Regional characteristic of 7YSZ coatings prepared by plasma spray-physical vapor deposition technique

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Rare Metals 2021年第11期40卷 3308-3315页

作者： Zi-Qian Deng Jie Mao Min Liu Chun-Ming Deng Jing-Tao Ma School of materials and Energy Guangdong University of TechnologyGuangzhou 510006China Guangdong institute of new materials National Engineering Laboratory for Modern Materials Surface Engineering Technology and The Key Lab of Guangdong for Modern Surface Engineering TechnologyGuangzhou 510651China School of materials Science and Engineering Central South UniversityChangsha 410083China

7 YSZ coating was prepared by plasma sprayphysical vapor deposition(PS-PVD) technique based on a specific experimental *** microstructure and deposition properties of 7 YSZ coating along the radius of plasma jet were investigated in *** show that the coating presents regional characteristic in the radial direction,which could be divided into three typical zones:In Zone Ⅰ,the coating is all composed of columnar structures with cauliflower structure,and the coating properties including the surface roughness and deposition efficiency(DE) are almost stable;in Zone Ⅲ,the coating is made up of solid particles,droplet and gas phase mixed without columnar structures;Zone Ⅱ is between Zone Ⅰ and ZoneⅢ, in which there are columns with domed top and small *** on experiment results,a model on the state and distribution of particles in plasma jet was proposed to clarify the regional *** study is helpful to comprehend and control coatings deposition by PS-PVD technique.

关键词： Plasma spray-physical vapor deposition 7YSZ coating Particles distributing Regional characteristic

Complex permittivity-dependent plasma confinement-assisted growth of asymmetric vertical graphene nanofiber membrane for high-performance Li-S full cells

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InfoMat 2022年第7期4卷 129-146页

作者： Yongshang Zhang Zhiheng Wu Shaobin Wang Neng Li S.Ravi P.Silva Guosheng Shao Peng Zhang State Center for International Cooperation on Designer Low-carbon&Environmental materials(CDLCEM) School of Materials Science and EngineeringZhengzhou UniversityZhengzhouChina Zhengzhou materials Genome institute(ZMGI) ZhengzhouChina School of Chemical Engineering and Advanced materials University of AdelaideAdelaideSouth AustraliaAustralia State Key Laboratory of Silicate materials for Architecture Wuhan University of TechnologyWuhanChina Nanoelectronics Center Advanced Technology InstituteUniversity of SurreyGuildfordUK

Vertical graphene(VG),possessing superior chemical,physical,and structural peculiarities,holds great promise as a building block for constructing a high-energy density lithium-sulfur(Li-S)***,it is desirable to develop a new VG growth technique with a novel structure to enable wide ***,we devise a novel complex permittivity-dependent plasma confinement-assisted VG growth technique,via asymmetric growing a VG layer on one side of N-doped carbon nanofibers for the first time,using a unique lab-built high flux plasma-enhanced chemical vapor deposition system,as a bifunctional nanofiber membrane to construct Li-S batteries with low neg-ative/positive(N/P)and electrolyte/sulfur(E/S)*** unique nanofiber membrane could simultaneously protect the cathode and anode,enabling an excellent electrochemical performance with low N/P and E/S ratios in Li-S *** a full cell delivers high gravimetric energy density and volumetric energy density of 340 Wh kg^(-1) and 547 Wh L^(-1),respectively,at low N/P(2:1)and E/S(4:1)***,a pouch cell achieves a high areal capacity of 7.1 mAh cm^(-2) at a sulfur loading of 6 mg cm^(-2).This work put forward a novel pathway for the design of high-energy density Li-S batteries.

关键词： asymmetric complex permittivity electrospinning Li-S batteries vertical graphene

Towards practical lean-electrolyte Li-S batteries:Highly solvating electrolytes or sparingly solvating electrolytes?

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Nano Research Energy 2022年第1期1卷 125-133页

作者： Hualin Ye Yanguang Li institute of Functional Nano&Soft materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and DevicesSoochow UniversitySuzhou 215123China Macao institute of materials Science and Engineering Macao University of Science and TechnologyTaipa 999078Macao SARChina

Lithium-sulfur(Li-S)batteries hold great promise to be the next-generation candidate for high-energy-density secondary batteries but in the prerequisite of using low electrolyte-to-sulfur(E/S)*** solvating electrolytes(HSEs)and sparingly solvating electrolytes(SSEs),with opposite nature towards the dissolution of polysulfides,have recently emerged as two effective solutions to decrease the E/S ratio and increase the overall practical energy density of Li-S *** featuring with high polysulfide solvation ability have the potential to reduce the E/S ratio by dissolving more polysulfides with less electrolyte,while SSEs alter the sulfur reaction pathway from a dissolution-precipitation mechanism to a quasi-solid mechanism,thereby independent on the use of electrolyte *** HSEs and SSEs show respective effectiveness in lean-electrolyte Li-S batteries,but encounter different challenges to bring Li-S batteries into practical *** review aims to present a comparative discussion on their unique features and basic electrochemical reaction mechanisms in practical lean-electrolyte Li-S *** is focused on the current technical challenges and possible solutions for their future development.

关键词： lithium−sulfur batteries lean electrolyte highly solvating electrolytes sparingly solvating electrolytes

Fracture mechanics associated with non-classical heat conduction in thermoelastic media

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Science China(Physics,Mechanics & Astronomy) 2012年第3期55卷 493-504页

作者： WANG BaoLin HAN JieCai Graduate School at Shenzhen and Center for Composite materials Harbin Institute of TechnologyHarbin 150001China School of materials Science and Engineering The University of New South WalesSydneyNSW 2052Australia

This paper studies the thermoelastic fracture in a solid under non-classical Fourier heat *** temperature field and the associated thermal stresses are solved by the dual integral equation *** thermally insulated crack and heated crack are *** is found that the crack tip thermal stress is singular and can be expressed in terms of the thermal stress intensity factor in a *** results show that the crack considerably amplifies the local thermal stresses,confirming the significance of the effect of non-classical heat conduction on the thermoelastic fracture mechanics of materials.

关键词： thermal stresses fracture mechanics non-classical heat conduction

Guest-assisted assembly strategy:boosting solvent-processed organic solar cells toward commercialization

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Science China Chemistry 2022年第4期65卷 645-646页

作者： Yong Cao State Key Laboratory of Luminescent materials and Devices Institute of Polymer Optoelectronic Materials and DevicesInstitute of Optoelectronic Materials and DevicesSouth China University of TechnologyGuangzhou 510640China

In recent years, due to the increasing demand for green energy, organic/polymer heterojunction solar cells have aroused great interest in the academic and industrial ***/polymer solar cells (OSCs) have a series of advantages over their counterparts. The morphology of the active layer and the energy band structure of the device can be adjusted easily by changing the molecular ***-area low-cost modules can be prepared by roll-to-roll solution printing at room temperature.

关键词： temperature structure polymer

Microstructure of fibrils separated from polyacrylonitrile fibers by ultrasonic etching

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Science China(Technological Sciences) 2010年第6期53卷 1489-1494页

作者： WANG QiFen,WANG ChengGuo,YU MeiJie,MA Jie,HU XiuYing & ZHU Bo carbon Fiber Engineering Research Center,Key Laboratory for Liquid-Solid Structural Evolution and Processing of materials (Ministry of Education),Shandong University,Jinan 250061,China carbon Fiber Engineering Research Center Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education) Shandong University Jinan China

Polyacrylonitrile (PAN) fiber is an important precursor fiber for high performance carbon *** properties of the final carbon fiber depend strongly on the nature of the PAN *** PAN fibrils were separated successfully from fibers by ultrasonic etching and were systematically investigated by field emission scanning electron microscopy (FESEM) and high resolution transmission electron microscopy (HRTEM).It is found that in certain ultrasonic etching conditions (at 75±2oC for 6 h with a frequency of 40 kHz) the PAN fibers are dissolved in the 95 wt.% aqueous dimethylsulphoxide (DMSO) solution;the fibrils consisting of numerous periodic lamellae with thickness of 30-45 nm and perpendicular to the fiber axis are separated in the 90 wt.% aqueous DMSO solution;and the fibrils with smooth surface exfoliated from the PAN fibers are obtained in the 70-90 wt.% aqueous DMSO *** periodical structure of fibrils was observed in HRTEM,which indicates that there are different densities and two phases in *** PAN fibers are dissolved layer by layer with increasing ultrasonic etching *** fiber surface experiences ultrasonic cleaning,selective etching,excessive etching and dissolution,and then the sublayer experiences the same *** are numerous periodic lamellae in fibrils of nascent *** means that the fibrils with lamellae are formed by orientation and crystallization in shearing field of spinning pipe and drawing stress field of coagulation bath.

关键词： carbon fibers PAN fibers fibrils microstructure

Edge sulfurized graphene nanoplatelets via vacuum mechano-chemical reaction for lithium–sulfur batteries

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Journal of Energy Chemistry 2017年第3期26卷 522-529页

作者： Longlong Yan Min Xiao Shuanjin Wang Dongmei Han Yuezhong Meng The Key Laboratory of Low-carbon Chemistry&Energy Conservation of Guangdong Province/State Key Laboratory of Optoelectronic materials and Technologies School of Materials Science and EngineeringSun Yat-sen UniversityGuangzhou 510275GuangdongChina Sino-French institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082GuangdongChina

Lithium–sulfur batteries have great potential for high energy applications due to their high capacities,low cost and eco-friendliness. However, the particularly rapid capacity decay owing to the dissolution and diffusion of polysulfide intermediate into the electrolyte still hamper their practical *** the reported preparation procedures to sulfur based cathode materials are often complex, and hence are rather difficult to produce at large scale. Here, we report a simple mechano-chemical sulfurization methodology in vacuum environment applying ball-milling method combined both the chemical and physical interaction for the one-pot synthesis of edge-sulfurized grapheme nanoplatelets with 3D porous foam structure as cathode materials. The optimal sample of 70%S–Gn Ps-48 h(ball-milled 48 h) obtains 13.2 wt% sulfur that chemically bonded onto the edge of Gn Ps. And the assembled batteries exhibit high initial discharge capacities of 1089 mAh/g at 0.1 C and 950 mAh/g at 0.5 C, and retain a stable discharge capacity of 776 mAh/g after 250 cycles at 0.5 C with a high Coulombic efficiency of over 98%. The excellent performance is mainly attributed to the mechano-chemical interaction between sulfur and grapheme nanoplatelets. This definitely triggers the currently extensive research in lithium–sulfur battery area.

关键词： Lithium sulfur batteries Graphene nanoplatelets Edge-functionalized with sulfur 3D porous foam structure Mechano-chemical interaction

Self-doped Br in Bi_(5)O_(7)Br ultrathin nanotubes:Efficient photocatalytic NO purification and mechanism investigation

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Chinese Chemical Letters 2022年第6期33卷 3161-3166页

作者： Ping Yan Qin Ren Fengyi Zhong Jieyuan Li Fusheng Wei Jianjun Li Xian Shi Fan Dong College of Architecture and Environment Sichuan UniversityChengdu 610065China Yangtze Delta Region institute(Huzhou)&institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaHuzhou 313001China State Centre for International Cooperation on Designer Low carbon and Environmental materials(CDLCEM) School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001 China

Bismuth-rich Bi_(5)O_(7)Br is a promising photocatalyst for pollutant removal owing to its stability and appropriate band structure in comparison with bismuth ***,bulk-phase Bi_(5)O_(7)Br suffers from poor light absorption and high charge recombination rates resulting in poor *** doping is a powerful strategy to enhance photocatalytic *** this study,we prepared a series of Br autodoped ultrathin Bi_(5)O_(7)Br nanotubes and explored the effect of Br doping on photocatalytic NO *** optimal doping content was determined via a photocatalytic NO removal experiment,which revealed the optimal ratio of Bi and Br was approximately 3:*** situ diffuse reflectance infrared Fourier transform spectroscopy(In situ DRIFT)and density functional theory(DFT)studies revealed that NO removal mechanism catalyzed by Br doped Bi_(5)O_(7)*** work presents a new strategy for the enhancement of photocatalytic pollutant degradation by bismuth oxyhalide photocatalysts.

关键词： Bi_(5)O_(7)Br Br auto-doped Photocatalytic no removal DFT In situ DRIFT

Stretchable, self‐healable, and breathable biomimetic iontronics with superior humidity‐sensing performance for wireless respiration monitoring

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SmartMat 2023年第2期4卷 88-105页

作者： Qiongling Ding Hao Wang Zijing Zhou Zixuan Wu Kai Tao Xuchun Gui Chuan Liu Wenxiong Shi Jin Wu State Key Laboratory of Optoelectronic materials and Technologies the Guangdong Province Key Laboratory of Display Material and TechnologySchool of Electronics and Information TechnologySun Yat‐sen UniversityGuangzhouChina Ministry of Education Key Laboratory of Micro and Nano Systems for Aerospace Northwestern Polytechnical UniversityXi'anChina institute for new Energy materials and Low carbon Technologies School of Materials Science and EngineeringTianjin University of TechnologyTianjinChina

Stretchable,self‐healing,and breathable skin‐biomimetic‐sensing iontronics play an important role in human physiological signal monitoring and human–computer ***,previous studies have focused on the mimicking of skin tactile sensing(pressure,strain,and temperature),and the development of more functionalities is *** this end,a superior humidity‐sensitive ionic skin is developed based on a self‐healing,stretchable,breathable,and biocompatible polyvinyl alcohol–cellulose nanofibers organohydrogel film,showing a pronounced thickness‐dependent humidity‐sensing *** as‐prepared 62.47‐μm‐thick organohydrogel film exhibits a high response(25,000%)to 98%RH,excellent repeatability,and long‐term stability(120 days).Moreover,this ionic skin has excellent resistance to large mechanical deformation and damage,and the worn‐out material can still retain its humidity‐sensing capabilities after self‐***‐sensing mechanism studies show that the induced response is mainly related to the increase of proton mobility and interfacial charge transport efficiency after water *** superior humidity responsiveness is attributed to the reduced thickness and the increased specific surface area of the organohydrogel film,allowing real‐time recording of physiological ***,by combining with a self‐designed printed circuit board,a continuous and wireless respiration monitoring system is developed,presenting its great potential in wearable and biomedical electronics.

关键词： biomimetic iontronics humidity sensor organohydrogel film self‐healable and breathable wireless respiration monitoring