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Phosphorus modulated porous CeO_(2)nanocrystallines for accelerated polysulfide catalysis in advanced Li-S batteries

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Journal of Materials Science & Technology 2022年第36期131卷 212-220页

作者： Xuefeng Tao Zhao Yang Menghao Cheng Rui Yan Fan Chen Sujiao Cao Shuang Li Tian Ma Chong Cheng Wei Yang College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065China State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of TechnologyLanzhou 730050China Department of Ultrasound National Clinical Research Center for GeriatricsWest China HospitalSichuan UniversityChengdu 610041China

The insulating nature of sulfur species,sluggish reaction kinetics,and uncontrolled dissolution of lithium polysulfide(LiPS)intermediates during the complex and multiphase sulfur redox process,have severely inhibited the applications of Li-S *** this study,we report a rational strategy to accelerate the polysulfide catalysis via constructing phosphorus modulated porous CeO_(2)(P-CeO_(2))for advanced Li-S *** morphology and surface analysis demonstrate that the P-CeO_(2)consists of abundant Pmodulated porous CeO_(2)*** battery performance reveals that the introduction of P will lead to an improved initial capacity of 1027 mA hg^(-1)than that of bare CeO_(2)(895.7 mA hg^(-1))at 0.2 *** addition,the P-CeO_(2)cathode can maintain a low capacity decay ratio of 0.10%per cycle after 500 cycles at 1.0 *** coin battery tests suggest that the P-CeO_(2)cathode presents faster oxidation-reduction kinetics of LiPS and quick diffusion of Li^+***,the studies of redox processes and chemical interactions of LiPS have demonstrated the P-CeO_(2)cathode displays stronger adsorption of Li_(2)S_(6),higher redox peak current,and earlier precipitation of Li_(2)S than the bare CeO_(2).This study demonstrates for the first time that the P-modulation of metal oxide surface can simultaneously promote the catalytic reaction kinetics and chemical interaction of *** anticipate that this P-modulation method can be extended to many other nanostructured metal catalytic sites for developing affordable advanced Li-S batteries.

关键词： Metal oxides P-modulated porous CeO_(2) Polysulfide catalytic materials Shuttle effects Lithium-sulfur batteries

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Microstructure and yield phenomenon of an extruded Mg-Y-Cu alloy with LPSO phase

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Journal of Rare Earths 2023年第3期41卷 454-461,I0005页

作者： Guangli Bi Niuming Zhang Jing Jiang Yuandong Li Tijun Chen Wei Fu Xiaoru Zhang Daqing Fang Xiangdong Ding State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou 730050China School of Material Science and Engineering Lanzhou University of TechnologyLanzhou 730050China State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong UniversityXi'an 710049China

A yield phenomenon was firstly reported in an extruded Mg-6.8Y-2.5Cu alloy and the corresponding microstructure was also investigated in this work,The cast alloy is mainly composed ofα-Mg,18R long period stacking order(LPSO)phase,eutectic phase(Mg_(20)Cu_(4)Y_(1)),and Mg_(2)Cu *** 18R LPSO phase at the dendritic grain boundary transforms into the 14H LPSO phase in the grain interior during *** extrusion,the grain size of the homogenized alloy is remarkably refined to-3.69μm and the second phase is significantly broken and distributed in the extrusion *** testing curves of the extrude alloy at room temperature indicate that the yield strength and ultimate tensile strength increase while the elongation of the alloy decreases with increasing strain ***,a yield plateau fo rms and gradually decreases with increasing strain *** yield phenomenon is related to the dislocation multiplication and the interaction between the movable dislocations and solute atoms.

关键词： Extruded Mg-6.8Y-2.5Cu alloy Long period stacking order phase Microstructure Yield phenomenon Rare earths

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Sol-gel-based porous Ti-doped tungsten oxide films for high-performance dual-band electrochromic smart windows

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Journal of Energy Chemistry 2023年第2期77卷 137-143,I0004页

作者： Qiancheng Meng Sheng Cao Juquan Guo Qingke Wang Ke Wang Tao Yang Ruosheng Zeng Jialong Zhao Bingsuo Zou School of Physical Science and Technology MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and MaterialsGuangxi UniversityNanning 530004GuangxiChina Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China

Dual-band electrochromic smart windows(DESWs)with independent control of the transmittance of near-infrared and visible light show great potential in the application of smart and energy-saving *** current strategy for building DESWs is to screen materials for composite or prepare plasmonic nanocrystal *** rigorous preparation processes seriously limit the further development of ***,we report a facile and effective sol-gel strategy using a foaming agent to achieve porous Ti-doped tungsten oxide film for the high performance of *** introduction of foaming agent polyvinylpyrrolidone during the film preparation can increase the specific surface area and free carrier concentration of the films and enhance their independent regulation ability of near-infrared *** a result,the optimal film shows excellent dual-band electrochromic properties,including high optical modulation(84.9%at 633 nm and 90.3%at 1200 nm),high coloration efficiency(114.9 cm^(2) C^(-1) at 633 nm and 420.3 cm^(2) C^(-1) at 1200 nm),quick switching time,excellent bistability,and good cycle stability(the transmittance modulation losses at 633 and 1200 nm were 11%and 3.5%respectively after 1000 cycles).A demonstrated DESW fabricated by the sol-gel film showed effective management of heat and light of *** study represents a significant advance in the preparation of dual-band electrochromic films,which will shed new light on advancing electrochromic technology for future energy-saving smart buildings.

关键词： Electrochromism Tungsten oxide Smart windows Sol-gel method Dual-band absorption

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Structure stability, electronic property and voltage profile of LiFe_(1-n)NnP_(1-m)M_(m)O_(4) olivine cathode material

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Rare metals 2021年第12期40卷 3512-3519页

作者： Zhi-Hong Cui Xue-Feng Lu Jian-Hua Luo Xin Guo Hong-Tao Xue Fu-Ling Tang State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal Department of Materials Science and EngineeringLanzhou University of TechnologyLanzhou 730050China

First-principles computational studies under density functional theory(DFT) framework were used to investigate the structural stability, conductivity and voltage profile of LiFe_(1-n)NnP_(1-m)M_(m)O_(4)(N, M = Si or S) electrode materials. It is found that the Li FeP_(7/8)Si_(1/8)O_(4) system has the most stable structure. After doping, the band gap values of the systems decrease gradually, and LiFe_(7/8)S_(1/8)PO_(4) system has a minimum band gap of 1.553 e V, attributed to the hybridization of the Fe-d and S-p orbital electrons. The Li Fe P7/8 S1/8 O4 system demonstrates the characteristic of n-type semiconductor, and other doping systems have the feature of p-type semiconductor. Charge density difference maps show that the covalent property of Si-O bond is enhanced in the Li FeP_(7/8)Si_(1/8)O_(4) system. The average distance of Li and O atoms in the S doping systems increases from 0.21026 to 0.21486 and 0.21129 nm, respectively,indicating that doping broadens significantly the channel of Li ion de-intercalation in LiFe_(7/8)S_(1/8)PO_(4) and LiFeP_(7/8)S_(1/8)O_(4). Additionally, the results of lithium intercalation potential imply that the voltages of the doping systems fallinto the range of 2.23-2.86 V.

关键词： Energy storage materials First principles Battery cathode LiFePO_(4) Doping Electronic properties

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Textured CsPbI_(3) nanorods composite fibers for stable high output piezoelectric energy harvester

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eScience 2024年第5期4卷 150-159页

作者： Tao Yang Dengzhou Jia Bing Xu Yongfei Hao Yanglong Hou Kang Wang Enhui Wang Zhentao Du Sheng Cao Kuo-Chih Chou Xinmei Hou Institute for Carbon Neutrality University of Science and Technology BeijingBeijing 100083China Institute of Steel Sustainable Technology Liaoning Academy of MaterialsShenyang 110000China School of Materials Shenzhen Campus of Sun Yat-Sen UniversityShenzhen 518107China MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured MaterialsGuangxi UniversityNanning 530004China Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China

The utilization of piezoelectric nanogenerator(PENG)based on halide perovskite materials has demonstrated significant promise for energy harvesting ***,the challenge of synthesizing halide perovskite materials with both high output performance and stability using a straightforward process persists as a substantial ***,we present the fabrication of CsPbI_(3) nanorods(NRs)exhibiting highly uniform orientation within polyvinylidene fluoride(PVDF)fibers through a simple texture engineering approach,marking the instance of enhancing PENG performance in this *** resultant composite fibers showcase a short-circuit current density(I_(sc))of 0.78μAcm^(-2) and an open-circuit voltage(V_(oc)) of 81V,representing a 2.5 fold increase compared to the previously reported highest value achieved without the electric poling *** outstanding output performance is ascribed to the orientation of CsPbI_(3) NRs facilitated by texture engineering and dipole poling via the self-polarization ***,the PENG exhibits exceptional thermal and water stability,rendering it suitable for deployment in diverse and challenging environmental *** findings underscore the significant potential of textured CsPbI_(3) NRs composite fibers for powering low-power consumer electronics,including commercial LEDs and electronic watches.

关键词： Texture engineering CsPbI_(3) Piezoelectric nanogenerator Self-polarization Electrospinning

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Effects of different annealing temperatures on microstructure, mechanical properties, and magnetic properties of cold-rolled 20Mn23AlV non-magnetic structural steel

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Journal of Iron and Steel Research International 2025年第4期32卷 961-978页

作者： Xing-chang Tang Gang-hu Cheng Zhi-hui Jia Da-yang Qi Zhi-jian Zhang Ying-ying Shen Wei-lian Zhou Yuan-yuan Hou State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou730050GansuChina College of Materials Science and Engineering Lanzhou University of TechnologyLanzhou730050GansuChina Jiangsu Binxin Steel Group Co. Ltd.Lianyungang222113JiangsuChina

The variations in the mechanical and magnetic properties of cold-rolled 20Mn23AlV non-magnetic structural steel after annealing at different temperatures were *** microstructure and precipitation changes during annealing were studied by optical microscopy,scanning electron microscopy,and transmission electron *** results show that recrystallization completed after annealing at 620℃,resulting in grain sizes of approximately 800 nm and the best combination of strength and *** yield-to-tensile ratio of the non-magnetic structural steel after cold rolling continuously decreases from low to high temperatures after annealing,with the highest value being 0.89 and the lowest value being 0.43,indicating a wide range of yield-to-tensile ratio *** introduction of numerous dislocations during cold rolling provided favorable nucleation sites for precipitation,leading to abundant precipitation of the fine second-phase V(C,N).The phase composition of the samples remained unchanged as single-phase austenite after annealing,and the relative permeability values were calculated to be less than 1.002,meeting the requirements for non-magnetic steel in terms of magnetic properties.

关键词： 20Mn23AlV non-magnetic structural steel Recrystallization V(C,N)precipitation Mechanical property Magnetic property

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Carrier recombination suppression and transport enhancement enable high-performance self-powered broadband Sb_(2)Se_(3) photodetectors

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InfoMat 2023年第4期5卷 60-76页

作者： Shuo Chen Yi Fu Muhammad Ishaq Chuanhao Li Donglou Ren Zhenghua Su Xvsheng Qiao Ping Fan Guangxing Liang Jiang Tang 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 UniversityShenzhenGuangdongthe People's Republic of China MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured MaterialsGuangxi UniversityNanningGuangxithe People's Republic of China State Key Laboratory of Silicon Materials&School of Materials Science and Engineering Zhejiang UniversityHangzhouZhejiangthe People's Republic of China Wuhan National Laboratory for Optoelectronics(WNLO) School of Optical and Electronic InformationHuazhong University of Science and TechnologyWuhanHubeithe People's Republic of China

Antimony selenide(Sb_(2)Se_(3))is a promising candidate for photodetector applications boasting unique material benefits and remarkable optoelectronic *** high-performance self-powered Sb_(2)Se_(3)photodetector through a synergistic regulation of absorber layer and heterojunction interface demonstrates great potential and needs essential *** this study,an effective two-step thermodynamic/kinetic deposition technique containing sputtered and selenized Sb precursor is implemented to induce self-assembled growth of Sb_(2)Se_(3)light absorbing thin film with large crystal grains and desirable[hk1]orientation,presenting considerable thin-film photodetector ***,aluminum(Al^(3+))cation dopant is introduced to modify the optoelectronic properties of CdS buffer layer,and further optimize the Sb_(2)Se_(3)/CdS(Al)heterojunction interface *** to the suppressed carrier recombination and enhanced carrier transport kinetics,the champion Mo/Sb_(2)Se_(3)/CdS(Al)/ITO/Ag photodetector exhibits self-powered and broadband characteristics,accompanied by simultaneously high responsivity of 0.9 A W^(-1)(at 11 nW cm^(-2)),linear dynamic range of 120 dB,impressive ON/OFF switching ratio over 10^(6)and signal-to-noise ratio of 10^(9),record total noise determined realistic detectivity of 4.78×10^(12)Jones,and ultra-fast response speed with rise/decay time of 24/75 ns,representing the top level for Sb_(2)Se_(3)-based *** intriguing work opens up an avenue for its selfpowered broadband photodetector applications.

关键词： photoresponse recombination suppression Sb_(2)Se_(3) self-powered photodetector transport enhancement

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Lightweight flower-like nitrogen-doped carbon materials achieve efficient electromagnetic wave absorption

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Carbon Letters 2025年 1-12页

作者： Xie, Xianfei Wang, Sheng Huang, Danqiang Dai, Jianfeng Wang, Qing State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals School of Materials Science and Engineering Lanzhou University of Technology Lanzhou China School of Science Lanzhou University of Technology Lanzhou China

Structural design and element doping are the research hotspots in the preparation of lightweight absorbers with high absorption performance and low filling rate. This study employs different temperature carbonization and etching techniques to prepare the structure of hollow nitrogen-doped carbon flowers (HNC) and evaluate their microwave absorption performance. At an ultra-low filler loading of 5 wt.%, the microwave absorption intensity of HNC-800 remains stable at -50 dB with a thickness of 3.2 mm. It is noteworthy that the HNC-800 achieved the broadest effective absorption frequency band at a matching thickness of 2 mm, with a bandwidth of 5.36 GHz (ranging from 12.4 to 17.76 GHz). Such remarkable broadband and reflection loss performance can be attributed to the synergistic effects of the hollow porous network structure, interface polarization, and dipole relaxation mechanisms. More significantly, the reduction of the radar cross-section (RCS) amounts to as much as 31.67 dB m2, and it has been attested to possess excellent adsorption efficacy in practical application scenarios. HNC-800, as an absorbing material, holds potential for broad application prospects.

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Mesoporous carbon layer encapsulated SnSe nanosheets via covalent bonds for high-performance sodium ion batteries

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ChemPhysMater 2023年第2期2卷 164-171页

作者： Mengfei Wang Liang Yang Maocheng Liu School of Mechanical and Electrical Engineering Lanzhou University of TechnologyLanzhou 730050China State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of TechnologyLanzhou 730050China School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China

Sodium ion batteries(SIBs)have been widely studied because of their low cost,low standard redox potential,and abundant sodium ***,the structural rupture during the Na+insertion/extraction processes and the poor conductivity of the anode material limit its cycling stability and rate ***,SnSe@C was prepared by high-temperature annealing with dopamine hydrochloride as the carbon source,while SnSe was prepared by a protein reduction *** carbon layer not only works as a protective layer to limit the volume expansion of SnSe and reduce the dissolution of Na 2 Se and poly-selenides generated during the discharge process in the electrolyte,but also as a conductive matrix to expedite electron transfer,thereby boosting the cycling stability and rate capability of SnSe@*** from the above advantages,SnSe@C exhibits a specific capacity of 211.3 mAh g^(−1) at 0.1 A g^(−1) after 110 cycles and outstanging rate capability(210.1 mAh g^(−1) at 5.0 A g^(−1) and capacity retention rate of 63.2%from 0.1 to 1.0 A g^(−1)).This study not only proposes an idea for promoting the cycling stability and rate capability of SnSe,but also paves the way for providing anodic materials with a stable structure for SIBs.

关键词： Sodium ion batteries Protein reduction method SnSe nanosheets High conductivity

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The effect of activating fluxes on the cathode spots in the activating TIG welding

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China Welding 2023年第1期32卷 7-17页

作者：黄勇王伯洋郭建航刘永刚黄健康樊丁余淑荣 School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals Lanzhou University of TechnologyLanzhou 730050China School of Mechanical and Electrical Engineering Lanzhou University of TechnologyLanzhou 730050China

The cathode spots are a common phenomenon in the TIG(tungsten inert gas)welding ***,it is rarely observed in the activating TIG welding *** research is mainly focused on the effect of activating flux on cathode spots in the activating TIG *** characteristics and behaviors of cathode spots were investigated in activating TIG welding by the high-speed camera and the *** kinds of oxide(TiO_(2),SiO_(2),MnO_(2))and two halide(MnCl_(2),CaF_(2))activating fluxes are used in the activating TIG welding *** results show that differ from the TIG welding,the oxide activating flux increases the number of cathode spots and decreases the *** effect is the opposite for the halide activating ***,the number of spots no longer varies with the current except TiO2 activating *** the temperature of the weld pool surface increases the spot moves away from the *** this rule is not valid when silica and manganese compounds activating fluxes are *** variation of cathode spots is caused by the oxide film reformed and the distribution of weld *** formation mechanism of cathode spots might be the impact of ions on the cathode surface and the strong electric field formed near the cathode surface.

关键词： cathode spots behaviors activating tungsten inert gas welding high-speed photography spectrum

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