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Dual-salt assisted synergistic synthesis of Prussian white cathode towards high-capacity and long cycle potassium ion battery

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能源化学:英文版 2023年第8期83卷 16-23,I0003页

作者： Rui Ma Zixing Wang Qingfeng Fu Wang Zhou Ying Mo Jian Tu Zhiyong Wang Peng Gao Changling Fan Jilei Liu College of Materials Science and Engineering Hunan Joint International Laboratory of Advanced Materials and Technology for Clean EnergyHunan Province Key Laboratory for Advanced Carbon Materials and Applied TechnologyHunan UniversityChangsha 410082HunanChina LI-FUN technology Corporation Limited Zhuzhou 412000HunanChina Hunan Zhongke Shinzoom technology Co. Ltd.Changsha 410082HunanChina

Prussian blue analogues(PBAs) are considered as superior cathode materials for potassium-ion batteries(PIBs) because of their three-dimensional open framework structure,high stability,and low ***,the intrinsic lattice defects and low potassium content typically results in poor rate and cycling performance,thus limited their practical *** this work,high-quality K1.64FeFe(CN)6(PW-HQ)material with less crystalline water(6.21%) and high potassium content(1.64 mol^(-1)) was successfully synthesized by a novel coprecipitation method with potassium citrate(K-CA) and potassium chloride(KCl) ***,the electrode delivers a reversible capacity of 113.1 mA h g^(-1)at the current rate of 50 mA g^(-1)with~100% coulombic ***,the electrode retained 90% reversible capacity at 500 mA g^(-1)current density after 1000 cycles,indicating only 0.01% capacity decay per ***,we have revealed that the introduction of K-CA controlled the chelating rate of Fe(Ⅱ) and the addition of KCl increased the K+content,hence improving the capacity and stability of the asprepared *** evolution and potassium storage mechanism were further investigated by detailed ex-situ X-ray diffraction and in-situ Raman measurements,which demonstrated reversible potassiation/depotassiation behavior and negligible volume change during the electrochemical *** general,this work provides an efficient strategy to eliminate water contents in Prussian blue cathode and improve its electrochemical performance,which plays a key role in promoting the industrialization of potassium ion batteries.

关键词： Potassium-ionbattery High-qualityK,FeFe(CN)s Potassiumchloride Potassiumcitrate Electrochemical properties

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Evolution of magnetically rotating arc into large area arc plasma

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Chinese Physics B 2015年第6期24卷 429-432页

作者：王城李皖皖张晓宁査俊夏维东 Department of Thermal Science and energy Engineering University of Science and TechnologyHefei Hefei General Machinery research Institute

An arc channel tends to shrink due to its conductivity increasing with the increase of temperature. In this study, to generate large area arc plasma, we construct a magnetically rotating arc plasma generator, which mainly consists of a lanthanide tungsten cathode （13 mm in diameter）, a concentric cylindrical graphite anode chamber （60 nun in diameter） and a solenoid coil for producing an axial magnet field. By controlling the cold gas flow, the magnetically rotating arc evolves from constricted mode to diffuse mode, which almost fills the whole arc chamber cross section. Results show that the diffuse arc plasma has better uniformity and stability. The formation mechanism of large area arc plasma is discussed in this paper.

关键词： magnetically rotating arc diffuse arc dispersed arc

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Online review driven route planning of green cold chain logistics: considering service attribute preference

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Journal of Traffic and Transportation Engineering(English Edition) 2024年

作者： Qubo Yu Xuze Ye Xueying Jiang Shaoquan Ni Kun Liu Xiaowei Liu School of Transportation and Logistics Southwest Jiaotong University New Corridor Logistics Group Co. Ltd.of Sichuan Port and Shipping Investment National Engineering Laboratory of Integrated Transportation Big Data Application technology Southwest Jiaotong University

For the long-distance cold chain transportation， this study focuses on green route planning in the cold chain multimodal transport network， considering the customers’ preferences on transport service attributes. To extract customers' preferences from online reviews， we build the bidirectional gated recurrent units (biGRU) and Logit framework. The coefficients representing the preferences for transport service attributes are calculated and integrated into the route planning model. To enhance the reliability of the routes， we utilize fuzzy set theories to describe travel time， transport cost coefficient， and capacity as trapezoidal fuzzy numbers. Then， we develop a fuzzy route planning model aims to minimize transportation cost， damage cost， refrigeration cost， carbon emission cost， and reliability cost. The numerical experiments are conducted on the new land and sea corridor in southwest China. The proposed method can plan the route which meet the customers’ preferences on transportation cost， travel time， reliability and carbon emission. Moreover， logistics companies can strike a balance between cost and reliability by setting confidence coefficients for travel time and capacity. Furthermore， carbon trading policy implements the significant effect on carbon emission reduction in cold chain logistics， when the trading price is 2 RMB per unit.

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Cone-beam computed tomography noise reduction method based on U-Net with convolutional block attention module in proton therapy

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Nuclear Science and Techniques 2024年第7期35卷 89-100页

作者： Xing-Yue Ruan Xiu-Fang Li Meng-Ya Guo Mei Chen Ming Lv Rui Li Zhi-Ling Chen Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai201800China University of Chinese Academy of Sciences Beijing100049China Shanghai Advanced research Institute Chinese Academy of SciencesShanghai201210China Department of Radiation Oncology Ruijin HospitalShanghai Jiao Tong University School of MedicineShanghai200025China Shanghai Key Laboratory of Proton therapy Shanghai201801China

Cone-beam computed tomography(CBCT)is mostly used for position verification during thetreatrment ***,severe image artifacts in CBCT hinder its direct use in dosecalculation and adaptive radiation therapy re-planning for proton *** this study,animproved U-Net neural network named CBAM-U-Net was proposed for CBCT noise reductioninproton therapy which is a GBCT denoised U-Net network with convolutional block *** datasets contained 20 groups of head and neck *** CT images wereregistered to CBCT images as ground *** original CBCT denoised U-Net network,sCTU-Net,was trained for model performance *** synthetic CT(SCT)images generated byCBAM-U-Net and the original sCTU-Net are called CBAM-SCT and U-Net-SCT images,*** HU accuracies of the CT,GBCT,and SCT images were compared using fourmetrics:mean absolute error(MAE),root mean square error(RMSE),peak signal-to-noise ratio(PSNR),and structure simila rity index measure(SSIM).The mean values of the MAE,RMSE,PSNR,and SSIM of CBAM-SCT images were 23.80 HU,64.63 HU,52.27 dB,and 09919,respectively,which were superior to those of the U-Net-SCT *** evaluate dosimetricaccuracy,the range accuracy was compared for a single-energy proton *** r-index passrates ofa 4 cm X 4 cm scanned field and simple plan were calculated to compare the effects of thenoise reduction capabilities of the original U-Net and CBAM-U-Net on the dose ***-U-Net reduced noise more effectively than sCTU-Net,particularly in *** proposed a CBAM-U-Net model for CBCT noise reduction in proton *** tothe excellent noise reduction capabilities of CBAM-U-Net,the proposed model provided relativelyexplicit information rega rding patient ***,it maybe be used in dose calculation andadaptive treatment planning in the future.

关键词： Proton therapy Cone-beam CT CBAM-U-Net γ-index

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2D Janus polymer nanosheets for enhancing oil recovery:From material ppreparation to property evaluation

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Petroleum Science 2023年第3期20卷 1584-1597页

作者： Hao Shen Zi-Hao Yang Guan-Zhong Wang Yi-Lin Xiong Qi-Chao Lv Qi Cao Qi-Qi Niu Yi-Bo Wang Zhao-xia Dong Unconventional Petroleum research Institute China University of Petroleum(Beijing)Bejing102249China Sinopec Zhenhai Refining and Chemical Company Ningbo315207ZhejiangChina Shenzhen Institute of Advanced technology Chinese Academy of SciencesShenzhen518055GuangdongChina School of energy Resources China University of Geosciences(Bejing)Bejing100083China

Janus amphiphilic polymer nanosheets(JAPNs)with anisotropic morphology and distinctive perfor-mance have aroused widespread ***,due to the difficulty in synthesis and poor dispersion stability,JAPNs have been scarcely reported in the field of enhancing oil recovery(EOR).Herein,a kind of organic-based flexible JAPNs was prepared by paraffin emulsion *** lateral sizes of JAPNs were ranging from hundreds of nanometers to several micrometers and the thickness was about 3 *** organic-based nanosheets were equipped with remarkably flexible structures,which could improve their injection *** dispersion and interfacial properties of JAPNs were studied *** modification of crosslinking agent containing multiple amino groups,the JAPNs had excellent hydro-philicity and salt resistance compared with conventional inorganic or composite *** settling time of nanosuspension with NaCl and CaCl_(2) at a low salinity of 1000 mg/L was over 240 *** value could also remain 124 h under the salinity of 10,000 mg/L *** the dual functionalities of Janus amphiphilic nature and nanoparticles'Pickering effect,JAPNs could change rock wettability and form emulsions as"colloidal surfactants",In particular,a new technology called optical microrheology was pioneered to explore the destabilization state of nanosuspensions for the first *** precipitation lagged behind aggregation,especially for stable suspension systems,the onset of the unstable behavior was difficult to be detected by conventional methods,which should be the indicator of reduced effec-tiveness for nanofluid *** addition,the oil displacement experiments demonstrated that the JAPNs could enhance oil recovery by 17.14%under an ultra-low concentration of 0.005%and were more suitable for low permeability *** findings can help for a better understanding of the material preparation of polymer *** also hope that this study could shed more light

关键词： 2D materials Polymer nanosheets Enhance oil recovery Janus nature Amphiphilic property

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Divisia Decomposition Method and Its Application to Changes of Net Oil Import Intensity

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Transactions of Tianjin University 2014年第1期20卷 72-78页

作者：廖华徐照祎王策 School of Management and Economics Beijing Institute of Technology Center for energy and Environmental Policy research Beijing Institute of Technology

The existing oil import dependence index cannot exactly measure the economic cost or scales, and it is difficult to describe the economical aspect of oil security. To measure the foreign dependence of one country's economy and reflect its oil economic security, this paper defines the net oil import intensity as the ratio of net oil import cost to GDP. By using Divisia Index Decomposition, the change of net oil import intensity in five industrialized countries and five newly industrialized countries during 1971—2010 is decomposed into five factors: oil price, oil intensity, oil self-sufficiency, domestic price level and exchange rate. The result shows that the dominating factors are oil price and oil intensity; moreover, the newly industrialized countries have higher net oil import intensity than industrialized countries.

关键词：石油净进口强度变化分解法工业化国家国内生产总值石油进口应用经济成本

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Insights into spin polarization regulated exciton dissociation and charge separation of C_(3)N_(4)for efficient hydrogen evolution and simultaneous benzylamine oxidation

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Nano research 2023年第7期16卷 8845-8852页

作者： Gen Li Xiaomei Sun Peng Chen Meiyang Song Tianxiang Zhao Fei Liu Shuang-Feng Yin Provincial Guizhou Key Laboratory of Green Chemical and Clean energy technology School of Chemistry and Chemical EngineeringGuizhou UniversityGuiyang 550025China College of Chemistry and Chemical Engineering Advanced Catalytic Engineering Research Center of the Ministry of EducationState Key Laboratory of Chemo/Biosensing and ChemometricsHunan UniversityChangsha 410082China

The employment of spin polarization under an external magnetic field holds great potential for the improvements of photocatalytic ***,owing to the huge difference in dielectric properties between ferromagnetic oxide and polymers,the photogenerated excitons with spin states are often limited to the ferromagnetic oxide wells,which leads to unsatisfactory *** this paper,a single-atom Co-doped C_(3)N_(4)photocatalyst is successfully synthesized for photocatalytic water splitting and simultaneous oxidation of *** a tiny external magnetic field(24.5 mT),the hydrogen production rate could reach at 3979.0μmol·g^(-1)·h^(-1),which is about 340 times that of C_(3)N_(4).Experimental results and theoretical calculations indicate that the interaction of Co d and N p orbital changes the symmetry center of C_(3)N_(4),resulting in an increase in dielectric constant and spin ***,magnetic fields further promote parallel electron spin,and the increased number of charges with the parallel spin-down state is likely to dissociate under the action of an external magnetic *** the other hand,the Co-N bond provides a huge built-in electric field and active site for strengthening the charge transfer and surface *** work not only deepens the understanding of spin polarization,but also enriches methods to accelerate electron-hole separation.

关键词： low magnetic field C_(3)N_(4) spin polarization photocatalytic hydrogen evolution benzylamine oxidation

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Practical development and challenges of garnet-structured Li_(7)La_(3)Zr_(2)O_(12) electrolytes for all-solid-state lithium-ion batteries:A review

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International Journal of Minerals,Metallurgy and Materials 2021年第10期28卷 1565-1583页

作者： Zao-hong Zhang Tao Wei Jia-hao Lu Qi-ming Xiong Yue-han Ji Zong-yuan Zhu Liu-ting Zhang School of energy and Power Jiangsu University of Science and TechnologyZhenjiang 212003China Institute of Mechanics and energy National Research Ogarev Mordovia State UniversitySaransk 430000Russia

All-solid-state Li-ion batteries(ASSLIBs)have been widely studied to achieve Li-ion batteries(LIBs)with high safety and energy *** reviews and experimental papers have focused on methods that improve the ionic conductivity,stabilize the electrochemical performance,and enhance the electrolyte/electrode interfacial compatibility of several solid-state electrolytes(SSEs),including oxides,sulfides,composite and gel electrolytes,and so ***-structured Li_(7)La_(3)Zr_(2)O_(12)(LLZO)is highly regarded an SSE with excellent application ***,this type of electrolyte also possesses a number of disadvantages,such as low ionic conductivity,unstable cubic phase,and poor interfacial compatibility with anodes/*** benefits of LLZO have urged many researchers to explore effective solutions to overcome its inherent ***,we review recent developments on garnet-structured LLZO and provide comprehensive insights to guide the development of garnet-structured LLZO-type *** not only systematically and comprehensively discuss the preparation,element doping,structure,stability,and interfacial improvement of LLZOs but also provide future perspectives for these *** review expands the current understanding on advanced solid garnet electrolytes and provides meaningful guidance for the commercialization of ASSLIBs.

关键词： all solid-state lithium-ion batteries garnet-structured LLZO electrolytes interfacial compatibility polymer-ceramic composite electrolytes

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Performance of personalized ventilation in mitigating short-range airborne transmission under the influence of multiple factors

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Building Simulation 2023年第11期16卷 2077-2092页

作者： Chunwen Xu Yijing Ren Na Li Li Liu Xiong Mei Yanchao Fan College of Pipeline and Civil Engineering China University of PetroleumQingdao266580China Department of Building Science School of ArchitectureTsinghua UniversityBeijing100084China School of energy and Power Engineering Changsha University of Science and TechnologyChangsha410114China East China Architectural Design and research Institute Shanghai200002China

The effectiveness of using personalized ventilation(PV)in mitigating airborne transmission risk was found to be easily affected by multiple *** aim of this study was hereby to evaluate the impacts of several important factors on the performance of PV in airborne disease control for closely ranged *** experiments were designed for CFD simulations under different levels of four selected *** indicated that the order of significance of these four factors affecting the intake fraction(IF)of the exposed occupant was as follows:mode of PV use>relative distance between occupants>PV airflow volume>background *** best combination of the four tested factors was PV of 15 L/s for both the infected source and the exposed occupant,with a relative distance of 2 m between them and mixing ventilation,which would yield an IF of merely 0.0246%.The worst combination was PV of 6 L/s for the exposed occupant only,with a relative distance of 0.86 m under displacement ventilation,indicating an elevated IF of 0.2919%.The increase of PV air volume and relative separation distance both contributed to lower exposure risk,but they were not as influential as the mode of PV *** integrated with mixing ventilation and utilized for both infected and susceptible occupants were *** findings in this study will be helpful to provide guidance for the implementation of PV in indoor environment for airborne infection control.

关键词： personalized ventilation intake fraction airborne transmission orthogonal experiment CFD simulation

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Numerical simulation of impact and solidification of melting dust on spherical bead surface and experimental validation

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Journal of Iron and Steel research(International) 2019年第7期26卷 679-690页

作者： Chuan-ping Liu Bin-jie Li Li Wang Shao-wu Yin Li-ge Tong School of energy and Environment Engineering University of Science and Technology Beijing Beijing 100083 China Beijing Engineering research Centre of energy Saving and Environmental Protection Beijing 100083 China

The impact and solidification processes of single melting tin dust at the micron scale on a spherical bead were numerically studied with hot flue gas flow. The geometrical evolution of dust impacting on hot bead and spreading without solidification involved initial spreading, retraction and oscillation, and stabilizing. The increased impact angle was found to reduce maximum spread area, weaken retraction and oscillation, and raise steady spread area. Dust impacting on cold bead completely solidified after liquid spreading and solidification without retraction and oscillation. Increased impact angle raised solidification sliding distance, whereas it reduced solidification spread area. Then, the effects of bead temperature, dust inlet velocity and size on the sliding and spreading of dust were studied, and the results indicated that increasing bead temperature, dust inlet velocity and size could raise solidification sliding distance and solidification spread area. With the dusts continually impacting on the bed, a dust layer forms at the front of bead, being different from that of solid dust, which becomes thick firstly, and then spreads from bead front to sides.

关键词： Melting dust Collision Solidification Spreading process Numerical simulation

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