检索结果-南通市图书馆

Investigation of wake-induced vibration interference between two staggered wave-cone cylinders at subcritical Reynolds number

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2024年第2期36卷 378-393页

作者： Lin Zou di-wei liu Jian liu Hong-cheng Zuo Yin-huan Zheng Hao Xia School of Mechanical and Electronic Engineering Wuhan University of TechnologyWuhan430070China Department of Aeronautical and Automotive Engineering Loughborough UniversityLoughboroughUK

The wake induced vibration(WIV)of a one-and two-degree-of-freedom(1DOF,2DOF)downstream wave-cone cylinder(WCC)behind a stationary equal-size upstream wave-cone cylinder in the staggered arrangement is numerically investigated at subcritical Reynolds number of 3900 by using shear stressed transfer(SST)k-ωturbulence *** streamwise pitch ratios(P/Dm)vary from 4 to 6 with a fixed incident angleα=8°.Experimental measurements were also performed for the validation of the present numerical *** is found that the largest vibration amplitude in crossflow direction occurred at P/Dm=4,Ur=8 with small difference of streamwise vibration at P/Dm=4,*** from single wavy-cone cylinder(SWCC),the downstream flexible one of a pair staggered WCCs got larger vibration amplitude during phase switching stage instead of in-phase *** upstream wake will suppress the triple frequency of main frequency in the power spectra density(PSD)functions of Cl but stimulate the double one of *** intriguing vibration mechanism happened in all 2DOF cases where the trajectory of downstream WCC is a significant ellipse rather than a figure of *** transformation of phase switching and the variation of the main frequency of drag coefficient(Cd)can be explained by the vortex-shedding modes of downstream WCC.

关键词： Two wave-cone cylinders staggered arrangement wake induced vibration phase switching vortex shedding

One-step post-treatment boosts thermoelectric properties of PEDOT:PSS flexible thin films

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2023年第1期132卷 81-89页

作者： Xingyu liu Xiao-Lei Shi Li Zhang wei-di liu Yanling Yang Zhi-Gang Chen School of Materials Science and Engineering Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic MaterialsShaanxi University of Science and TechnologyXi’an 710021China School of Chemistry and Physics Queensland University of TechnologyBrisbaneQLD 4000Australia Australian Institute for Bioengineering and Nanotechnology The University of QueenslandBrisbaneQLD 4072Australia

Developing high-performance poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate)(PEDOT:PSS)sig-nificantly widens the practical applications of flexible organic thermoelectric devices,while the water-based co-solvent dopants and/or post-treatments are still rarely studied so ***,we develop a one-step post-treatment to improve the power factor of PEDOT:PSS films by using a water-based solution,which is composed of co-solvent(polar solvent dimethylacetamide(DMAC)and deionized water)and organic reducing agent L-ascorbic acid(LAA).The 80 vol.%DMAC solution significantly boosts the room-temperature electrical conductivity of the films from 5 to 964 S cm^(−1),while the Seebeck coefficient can be further enhanced from 18.7 to 25μV K−1 by treating with 0.5 mol L−1 LAA,contributing to a sig-nificantly improved power factor of 55.3μW m^(−1)K^(−2).The boosted electrical conductivity is ascribed to the separated PEDOT and PSS phases triggered by the high dielectric constant and polarity of DMAC;while the improved Seebeck coefficient is attributed to the reduced oxidation degree of PEDOT from the reducing agent LAA,both confirmed by the comprehensive structural and morphological ***,a maximum power factor of 64.4μW m^(−1)K^(−2)can be achieved at 360 K and the observed temperature-dependent electrical transport behavior can be well explained by the Mott variable range hopping ***,a flexible thermoelectric device,assembled by the as-fabricated PEDOT:PSS films,exhibits a maximum output power of∼23 nW at a temperature difference of 25 K,indicating the potential for applying to low-grade wearable electronics.

关键词： Thermoelectric PEDOT:PSS Post-treatment dimethylacetamide L-ascorbic acid

Texture and Se vacancy optimization induces high thermoelectric performance in Bi_(2)Se_(3) flexible thin films

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2024年第6期43卷 2796-2804页

作者： Dong-wei Ao wei-di liu Yue-Xing Chen Fan Ma Yi-Jie Gu Zhuang-Hao Zheng School of Machinery and Automation Weifang UniversityWeifang 261061China Australian Institute for Bioengineering and Nanotechnology The University of QueenslandBrisbane 4072Australia Shenzhen Key Laboratory of Advanced Thin Films and Applications Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen518060China School of Materials Science and Engineering Inner Mongolia University of TechnologyHohhot 010051China

Bi_(2)Se_(3)-based flexible thin film with high thermoelectric performance is promising for the waste heat recovery *** this work,a novel post-selenization method is employed to prepare n-type Bi_(2)Se_(3)flexible thin films with highly textured *** strengthened texture and Se vacancy optimization can be simultaneously achieved by optimizing the selenization *** highly oriented texture leads to the increased carrier mobility and results in a high electric conductivity of~290.47 S·cm^(-1)at 623 ***,a high Seebeck coefficient(>110μW·K-1)is obtained due to the reduced carrier concentration,induced by optimizing vacancy ***,a high power factor of 3.49μW·cm^(-1)·K^(-2)at 623 K has been achieved in asprepared highly-bendable Bi_(2)Se_(3)flexible thin films selenized at 783 *** study introduces an effective post-selenization method to tune the texture structure and vacancies of Bi_(2)Se_(3)flexible thin films,and correspondingly achieves high thermoelectric performance.

关键词： Thermoelectric Bi_(2)Se_(3) Flexible thin film Post-selenization

Recycle spent graphite to defect-engineered,high-power graphite anode

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第4期16卷 4240-4245页

作者： Jiawei Luo Jingchao Zhang Zhaoxin Guo Zhedong liu Shuming Dou wei-di liu Yanan Chen Wenbin Hu School of Materials Science and Engineering Tianjin UniversityTianjin 300072China Australian Institute for Bioengineering and Nanotechnology The University of QueenslandSt LuciaQLD 4072Australia

Graphite is a dominant anode material for lithium-ion batteries(LIBs)due to its outstanding electrochemical ***,slow lithium ion(Li+)kinetics of graphite anode restricts its further ***,we report that high-temperature shock(HTS)can drive spent graphite(SG)into defect-rich recycled graphite(DRG)which is ideal for high-rate *** DRG exhibits the charging specific capacity of 323 mAh/g at a high current density of 2 C,which outperforms commercial graphite(CG,120 mAh/g).The eminent electrochemical performance of DRG can be attributed to the recovery of layered structure and partial remaining defects of SG during ultrafast heating and cooling process,which can effectively reduce total strain energy,accelerate the phase transition in thermodynamics and improve the Li+*** study provides a facile strategy to guide the re-graphitization of SG and design high performance battery electrode materials by defect engineering from the atomic level.

关键词： ultrafast recycling defect-rich graphite anode high-temperature shock

Progress in electrode materials for the industrialization of sodium-ion batteries

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2023年第1期33卷 1-7页

作者： Zhaoxin Guo Guangdong Qian Chunying Wang Ge Zhang Ruofan Yin wei-di liu Rui liu Yanan Chen School of Materials Science and Engineering Shandong University of Science and Technology School of Materials Science and Engineering Tianjin University Australian Institute for Bioengineering and Nanotechnology The University of Queensland

In recent years, sodium-ion batteries(SIBs) have received renewed attention due to the continued rise in lithium prices. SIBs are promising to replace lithium-ion batteries under various application scenarios, such as large-scale energy storage systems and low-speed electric vehicles. As the core of SIBs, electrode materials are the key factor demining the electrochemical performance. Key drawback, including cycle stability, air stability and energy density, are refraining the development of SIBs off-industrialization. For a systematic understanding on the development of SIBs, in this review, we summarized the progress of SIBs from the industrialization viewpoint,including the fabrication methods suitable for large scale production of electrode materials of SIBs, and the optimization strategies to improve electrochemical performance. Finally, we proposed promising directions for future development of electrode materials for SIBs toward industrialization.

关键词： Sodium-ion batteries Electrode materials Industrialization

Co-free/Co-poor high-Ni cathode for high energy,stable and low-cost lithium-ion batteries

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2023年第7期42卷 2214-2225页

作者： Zhe-Dong liu Chun-Ying Wang Jing-Chao Zhang Jia-wei Luo Cui-Hua Zeng wei-di liu Rui liu Ya-Nan Chen School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao266590China School of Materials Science and Engineering Tianjin UniversityTianjin300072China Australian Institute for Bioengineering and Nanotechnology The University of QueenslandBrisbaneQLD4072Australia

Advanced cathode materials have been considered as the key to significantly improve the energy density of lithium-ion batteries(LIBs).High-Ni layer-structured cathodes,especially with Ni atomic content above 0.9(LiN1_(x)M_(1-x)O_(2),x≥0.9),exhibit high capacity to be commercially available in electric vehicles(EVs).However,the intrinsic structure instability of high-Ni materials and the negative impacts severely restrict their further applic *** addition,Co has various effective efforts to stabilize the layered ***,due to the high cost of Co,it is required to be ***,modification methods on increasing the stability of high-Ni cathode with the reduction of Co content have been widely *** this review,we summarized various effective research progresses and several potential modification strategies of Cofree/Co-poor layered c athodes with Ni content over *** challenges and development opportunities of high-Ni,Cofree/Co-poor cathodes are further overviewed to meet the future commercial energy demands.

关键词： Lithium-ion batteries(LIBs) Co-free/poor High-Ni Cathode materials

Approaching Ultimate Synthesis Reaction Rate of Ni-Rich Layered Cathodes for Lithium-Ion Batteries

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2024年第10期16卷 392-402页

作者： Zhedong liu Jingchao Zhang Jiawei Luo Zhaoxin Guo Haoran Jiang Zekun Li Yuhang liu Zijing Song Rui liu wei-di liu Wenbin Hu Yanan Chen School of Materials Science and Engineering Tianjin UniversityTianjin 300072People's Republic of China School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590People's Republic of China Australian Institute of Bioengineering and Nanotechnology The University of QueenslandSt LuciaQLD 4072Australia

Nickel-rich layered oxide LiNi_(x)Co_(y)MnzO_(2)(NCM,x+y+z=1)is the most promising cathode material for high-energy lithium-ion ***,conventional synthesis methods are limited by the slow heating rate,sluggish reaction dynamics,high energy consumption,and long reaction *** overcome these chal-lenges,we first employed a high-temperature shock(HTS)strategy for fast synthesis of the NCM,and the approaching ultimate reaction rate of solid phase transition is deeply investigated for the first *** the HTS process,ultrafast average reaction rate of phase transition from Ni_(0.6)Co_(0.2)Mn_(0.2)(OH)_(2) to Li-containing oxides is 66.7(%s^(-1)),that is,taking only 1.5 *** ultrahigh heating rate leads to fast reaction kinetics,which induces the rapid phase transition of NCM *** HTS-synthesized nickel-rich layered oxides perform good cycling performances(94%for NCM523,94%for NCM622,and 80%for NCM811 after 200 cycles at 4.3 V).These findings might also assist to pave the way for preparing effectively Ni-rich layered oxides for lithium-ion batteries.

关键词： Nickel-rich layered oxides High-temperature shock Solid reaction kinetics Phase transition Reaction rate

Se-alloying reducing lattice thermal conductivity of Ge_(0.95)Bi_(0.05)Te

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2022年第11期106卷 249-256页

作者： De-Zhuang Wang wei-di liu Xiao-Lei Shi Han Gao Hao Wu Liang-Cao Yin Yuewen Zhang Yifeng Wang Xueping Wu Qingfeng liu Zhi-Gang Chen State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing211800China Centre for Future Materials University of Southern QueenslandSpringfield CentralQLD 4300Australia School of Mechanical and Mining Engineering The University of QueenslandBrisbaneQLD 4072Australia Key Laboratory of Material Physics of Ministry of Education School of Physics and MicroelectronicsZhengzhou UniversityZhengzhou450052China College of Materials science and engineering Nanjing Tech UniversityNanjing211800China School of Chemistry and Chemical Engineering Hefei University of TechnologyHefei230009China CAS Key Laboratory of Carbon Materials Institute of Coal ChemistryChinese Academy of SciencesTaiyuan030001China

High lattice thermal conductivity of intrinsic GeTe limits the wide application of GeTe-based ***,the optimization of GeTe-based thermoelectric materials has been focusing on reducing lattice thermal conductivity via strengthening phonon *** this study,we systematically studied thermoelectric properties of Se-alloyed Ge_(0.95) Bi_(0.05) Te via theoretical calculations,structural characterizations,and performance *** results indicate that Se-alloying can induce dense point defects with mass/strain-field fluctuations and correspondingly enhance point defect phonon scattering of the Ge_(0.95) Bi_(0.05) Te ***-alloying might also change chemical bonding strength to introduce resonant states in the base frequency of Ge_(0.95) Bi_(0.05) Te matrix,which can strengthen Umklapp phonon ***,a decreased lattice thermal conductivity from∼1.02 W m^(−1) K^(−1) to∼0.65 W m^(−1) K^(−1) at 723 K is obtained in Ge_(0.95) Bi_(0.05) Te_(1-x) Se_(x) pellets with increasing the Se content from 0 to 0.3.A peak figure of merit of∼1.6 at 723 K is achieved in Ge_(0.95) Bi_(0.05) Te_(0.7) Se_(0.3) pellet,which is∼77%higher than that of pristine *** study extends the understanding on the thermoelectric performance of GeTe.

关键词： Thermoelectric GeTe Se-alloying Lattice thermal conductivity

Synergistic band convergence and defect engineering boost thermoelectric performance of SnTe

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2021年第27期86卷 204-209页

作者： Ximeng Dong Wenlin Cui wei-di liu Shuqi Zheng Lei Gao Luo Yue Yue Wu Boyi Wang Zipei Zhang Liqiang Chen Zhi-Gang Chen State Key Laboratory of Heavy Oil Processing College of New Energy and MaterialsChina University of PetroleumBeijing 120049PR China State Key Laboratory of Heavy Oil Processing College of ScienceChina University of PetroleumBeijing 102249PR China Centre for Future Materials University of Southern QueenslandSpringfield CentralQueensland 4300Australia School of Mechanical and Mining Engineering The University of QueenslandBrisbaneQueensland 4072Australia State Key Laboratory of Advanced Power Transmission Technology Global Energy Interconnection Research Institute Co.Ltd.Changping DistrictBeijing 102211PR China Beijing Key Laboratory of Failure Corrosion and Protection of Oil/gas Facilities and Department of Materials Science and EngineeringCollege of New Energy and MaterialsChina University of PetroleumBeijing 102249PR China

As an eco-friendly thermoelectric material,Sn Te has attracted extensive *** this study,we use a stepwise strategy to enhance the thermoelectric performance of Sn ***,Ag Cl is doped into Sn Te to realize band convergence and enlarge the band gap of Ag Cl-doped Sn *** Cl-doping also induces dense point defects,strengthens the phonon scattering,and reduces the lattice thermal ***,Sb is alloyed into Ag Cl-doped Sn Te to further optimize the carrier concentration and simultaneously reduce the lattice thermal conductivity,leading to improved thermoelectric dimensionless figure of merit,***,(Sn_(0.81)Sb_(0.19)Te)_(0.93)(Ag Cl)_(0.07)has approached the ZT value as high as~0.87 at 773 K,which is 272%higher than that of pristine Sn *** study indicates that stepwise Ag Cl-doping and Sb-alloying can significantly improve thermoelectric performance of Sn Te due to synergistic band engineering,carrier concentration optimization and defect engineering.

关键词： Thermoelectric SnTe Stepwise optimize Band structure Lattice thermal conductivity