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Oxygen vacancy promising highly reversible phase transition in layered cathodes for sodium-ion batteries

Nano Research 2021年第11期14卷 4100-4106页

作者： Kezhu Jiang Shaohua Guo Wei Kong Pang Xueping Zhang Tiancheng Fang Shao-fei Wang Fangwei Wang Xiaoyu Zhang Ping He Haoshen Zhou center of energy Storage Materials&technology College of Engineering and Applied SciencesNational Laboratory of Solid State MicrostructuresCollaborative Innovation Center of Advanced MicrostructuresJiangsu Key Laboratory of Artificial Functional MaterialsNanjing UniversityNanjing210093China institute for Superconducting&Electronic Materials School of MechanicalMaterials and Mechatronics EngineeringUniversity of WollongongWollongongNSW2522Australia China Spallatoin Neutron Source Institute of High Energy PhysicsChinese Academy of SciencesDongguan523808China School of nuclear Science and technology University of Chinese Academy of SciencesBeijing101408China Beijing National laboratory for Condensed Matter Physics institute of Physics Chinese Academy of SciencesBeijing100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing101408China Songshan Lake Materials laboratory Dongguan523808China School of materials science and engineering Jiangsu UniversityZhenjiang212013China energy technology.Research institute National Institute of Advanced Industrial Science and Technology(AIST)Umezono 1-1-1Tsukuba305-8568Japan

Phase transition is common during (de)-intercalating layered sodium oxides, which directly affects the structural stability and electrochemical performance. However, the artificial control of phase transition to achieve advanced sodium-ion batteries is lacking, since the remarkably little is known about the influencing factor relative to the sliding process of transition-metal slabs upon sodium release and uptake of layered oxides. Herein, we for the first time demonstrate the manipulation of oxygen vacancy concentrations in multinary metallic oxides has a significant impact on the reversibility of phase transition, thereby determining the sodium storage performance of cathode materials. Results show that abundant oxygen vacancies intrigue the return of the already slide transition-metal slabs between O_(3) and P_(3) phase transition, in contrast to the few oxygen vacancies and resulted irreversibility. Additionally, the abundant oxygen vacancies enhance the electronic and ionic conductivity of the Na0.9Ni0.3Co0.15Mn0.05Ti0.5O2 electrode, delivering the high initial Coulombic efficiency of 97.1%, large reversible capacity of 112.7 mAh·g−1, superior rate capability upon 100 C and splendid cycling performance over 1,000 cycles. Our findings open up new horizons for artificially manipulating the structural evolution and electrochemical process of layered cathodes, and pave a way in designing advanced sodium-ion batteries.

关键词： sodium-ion battery layered oxide O_(3)phase oxygen vacancy reversible phase transition

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Germanium isotope effect induced guest rattling and cage distortion in clathrates

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Journal of Materiomics 2018年第4期4卷 338-344页

作者： Ran Ang Zhengshang Wang Shang-Fei Wu Pierre Richard Zhenzhong Yang Lin Gu Gang Mu Jingtao Xu Ning Liu Jun Tang key laboratory of Radiation Physics and technology Ministry of EducationInstitute of Nuclear Science and TechnologySichuan UniversityChengdu610064China institute of new energy and Low-Carbon technology Sichuan UniversityChengdu610065China institute of Physics Chinese Academy of SciencesBeijing100190China collaborative innovation center of Quantum Matter Beijing100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing100190China State key laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai200050China Ningbo institute of Materials technology.and engineering Chinese Academy of SciencesNingbo315201China

Intermetallic clathrates are materials characterized by a large cage structure where guest atoms can move anharmonically,providing these materials exotic thermoelectric ***,the dynamical and atomic nature of the rattling phonons,and their interactions with the electronic structure,are not fully ***,we report that a germanium isotope effect can trigger an inherent guest rattling and cage distortion in clathrate Ba8Ga16Ge30(BGG).Raman-scattering spectroscopy and advanced electron microscopy demonstrate that the atomic germanium isotope effect induces an offcentre rattling at the 6d sites as well as a tetrakaidecahedron deformation which is anisotropic for ntype BGG but isotropic for p-type *** present findings indicate that the large n-type germanium isotope effect arises from the strong electron-phonon coupling,which opens up a novel avenue for manipulating dynamical motions of phonons via atomic isotope engineering.

关键词： Thermoelectric Clathrate Isotope effect Electron-phonon coupling

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An N/D study of the S_(11)channelπN scattering amplitude

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Chinese Physics C 2022年第2期46卷 35-48页

作者： Qu-Zhi Li Yao Ma Wen-Qi Niu Yu-Fei Wang Han-Qing Zheng Department of Physics and State key laboratory of nuclear Physics and technology Peking UniversityBeijing 100871China institute for advanced Simulation Institut fiir Kemphysik and Julich Center for Hadron PhysicsForschungszentrum JiilichD-52425 JiilichGermany College of Physics Sichuan UniversityChengdu 610065China collaborative innovation center of Quantum Matter Beijing 100871China

Extensive dynamical N/D calculations are conducted in the study of S_(11) channel low energy πN scatterings,based on various phenomenological model inputs of left cuts at the tree *** subtleties of the singular behavior of the partial wave amplitude,at the origin of the complex s plane,are analysed in ***,it is found that the dispersion representation for the phase shift,δ,must be modified in the case of πN *** additional contribution from the dispersion integral exists,which approximately cancels the contribution of the two virtual poles located near the end points of the segment cut,induced by u channel nucleon *** limited reliance on the details of the dynamical inputs,the subthreshold resonance N*(890)survives.

关键词： new baryonic state dispersion relations partial wave analyses

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Ozonation as an efficient pretreatment method to alleviate reverse osmosis membrane fouling caused by complexes of humic acid and calcium ion

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Frontiers of Environmental Science & engineering 2019年第4期13卷 89-100页

作者： Xuehao Zhao Yinhu Wu Xue Zhang Xin Tong Tong Yu Yunhong Wang Nozomu Ikuno Kazuki Ishii Hongying Hu Environmental Simulation and Pollution Control State key Joint laboratory State Environmental Protection Key Laboratory of Microorganism Application and Risk Control (SMARC)School of EnvironmentTsinghua UniversityBeijing 100084China collaborative innovation center for advanced nuclear energy technology Institute of Nuclear and New Energy TechnologyTsinghua UniversityBeijing 100084China Kurita Water Industries Ltd. Nakano-kuTokyo 164-0001Japan Shenzhen Environmental Science and new energy technology.engineering laboratory Tsinghua-Berkeley Shenzhen InstituteShenzhen 518055China

Humic acid has been considered as one of the most significant sources in feed water causing organic fouling of reverse osmosis (RO) membranes, but the relationship between the fouling behavior of humic acid and the change of its molecular structure has not been well developed yet. In this study, the RO membrane fouling behavior of humic acid was studied systematically with ozonation as a pretreatment method to control RO membrane fouling. Furthermore, the effect of ozone on the structure ofhumic acid was also explored to reveal the mechanisms. Humic acid alone (10-90 mg/L, in deionized water) was found not to cause obvious RO membrane fouling in 45-h operation. However, the presence of Ca^2+ aggravated significantly the RO membrane fouling caused by humic acid, with significant flux reduction and denser fouling layer on RO membrane, as it was observed by scanning electron microscope (SEM) and atomic force microscope (AFM). However, after the pretreatment by ozone, the influence of Ca^2+ was almost eliminated. Further analysis revealed that the addition of Ca^2+ increased the particle size of humic acid solution significantly, while ozonation reduced the SUVA254, particle size and molecular weight of the complexes of humic acid and Ca^2+(HA-Ca^2+ complexes). According to these results and literature, the bridge effect of Ca^2+ aggregating humic acid molecules and the cleavage effect of ozone breaking HA-Ca^2+ complexes were summarized. The change of the structure of humic acid under the effect of Ca^2+ and ozone is closely related to the change of its membrane fouling behavior.

关键词： Reverse osmosis Membrane fouling Humic acid Ca^2+ Ozone

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Porous SiC/melamine-derived carbon foam frameworks with excellent electromagnetic wave absorbing capacity

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Journal of advanced Ceramics 2019年第4期8卷 479-488页

作者： Xinli YE Zhaofeng CHEN Sufen AI Bin HOU Junxiong ZHANG Xiaohui LIANG Qianbo ZHOU Hezhou LIU Sheng CUI International laboratory for Insulation and energy Efficiency Materials College of Materials Science and TechnologyNanjing University of Aeronautics and AstronauticsNanjing 211106China Suzhou Superlong Aviation Heat Resistance Material technology.Co. Ltd.Suzhou 215400China Beijing Spacecrafts China Academy of Space TechnologyBeijing 100080China Department of reactor engineering China Institute of Atomic EnergyBeijing 102413China The State key Lab of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai 200240China Jiangsu collaborative innovation center for advanced Inorganic Function Composites Nanjing Tech UniversityNanjing 211800China

Porous three-dimensional Si C/melamine-derived carbon foam(3 D-Si C/MDCF)composite with an original open pore structure was fabricated by the heat treatment of the commercial melamine foam(MF),carbonization of the stable MF,and chemical vapor deposition of the ultra-thin Si C *** electron microscopy(SEM)and X-ray diffraction(XRD)were employed to detect the microstructure and morphology of the as-prepared *** results indicated that the 3 D-Si C/MDCF composites with the coating structure were prepared *** obtained minimum reflection loss was–29.50 d B when the frequency and absorption thickness were 11.36 GHz and 1.75 mm,***,a novel strategy was put forward to state that the best microwave absorption property with a thin thickness of 1.65 mm was gained,where the minimum reflection loss was–24.51 d B and the frequency bandwidth was 3.08 *** excellent electromagnetic wave absorption ability resulted from the specific cladding structure,which could change the raw dielectric property to acquire excellent impedance *** present work had a certain extend reference meaning for the potential applications of the lightweight wave absorption materials with target functionalities.

关键词： three-dimensional SiC/melamine-derived carbon foam(3D-SiC/MDCF) chemical vapor deposition coating structure electromagnetic wave absorption characteristic minimum reflection loss

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Static recrystallization behavior of SA508Gr.4N reactor pressure vessel steel during hot compressive deformation

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Journal of Iron and Steel Research International 2021年第5期28卷 604-612页

作者： Shi-bin Qiao Xi-kou He Chang-sheng Xie Zheng-dong Liu institute for Special Steels Central Iron and Steel Research InstituteBeijing 100081China collaborative innovation center of Steel technology University of Science and Technology BeijingBeijing 100083China

The two-pass isothermal hot compression method was used to study the effect of different thermal deformation conditions on static recrystallization behavior in Ni-Cr-Mo series SA508Gr.4N low alloy steel with interval holding time ranging from 1 to 300 s,temperature ranging from 950 to 1150℃,strain rate ranging from 0.01 to 1 s^(-1),true strains ranging from 0.1 to 0.2,and initial austenite grain size ranging from 175 to 552μ*** can be concluded that the static recrystallization volume fraction gradually increases with the increase in the deformation temperature,strain rate,strain and pass interval,and the decrease in the initial grain size,which is mainly due to the increase in the deformation energy storage and ***,strain-induced grain boundary migration is the nucleation mechanism for static recrystallization of SA508Gr.4N low alloy *** on the stress-strain curve,the predicted value obtained from the established static recrystallization kinetics model is in good consistence with the experimental value,and the static recrystallization thermal activation energy of SA508Gr.4N steel was calculated as 264,225.99 J/mol.

关键词： nuclear reactor pressure vessel Two-pass isothermal thermal compression Static recrystallization Kinetics model

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Current development of body-centered cubic high-entropy alloys for nuclear applications

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Tungsten 2021年第2期3卷 197-217页

作者： Tan Shi Peng-Hui Lei Xu Yan Jing Li Yun-Di Zhou Yun-Peng Wang Zheng-Xiong Su Yan-Kun Dou Xin-Fu He Di Yun Wen Yang Chen-Yang Lu Department of nuclear Science and technology Xi’an Jiaotong UniversityXi’an 710049China China institute of Atomic energy Beijing 102413China

High-entropy alloys greatly expand the alloy design range and offer new possibilities for improving material *** on the worldwide research efforts in the last decade,the excellent mechanical properties and promising radiation and corrosion resistance of this group of materials have been ***-entropy alloys with body-centered cubic(BCC)structures,especially refractory high-entropy alloys,are considered as promising materials for high-temperature applications in advanced nuclear ***,the extreme reactor conditions including high temperature,high radiation damage,high stress,and complex corrosive environment require a comprehensive evaluation of the material properties for their actual service in nuclear *** review summarizes the current progress on BCC high-entropy alloys from the aspects of neutron economy and activation,mechanical properties,high-temperature stability,radiation resistance,as well as corrosion *** the current development of BCC high-entropy alloys for nuclear applications is still at an early stage as the large design space of this group of alloys has not been fully explored,the current research findings provide a good basis for the understanding and prediction of material behaviors with different compositions and *** in-depth understanding of the degradation mechanisms and characterization of material properties in response to conditions close to reactor environment are necessary.A critical down-selection of potential candidates is also crucial for further comprehensive evaluation and engineering validation.

关键词： Body-centered cubic high-entropy alloys Refractory high-entropy alloys nuclear materials Radiation damage Tungsten

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Reducing the carbon emissions from Qianxi tomato fruits preservation by cold atmospheric plasma

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International Journal of Agricultural and Biological engineering 2023年第5期16卷 213-220页

作者： Tao Jin Yan Chen Chenwei Dai Jimin Deng Qinghua Xu Zhengwei Wu School of nuclear Science and technology University of Science and Technology of ChinaHefei 230026China Joint laboratory of Plasma Application technology Institute of Advanced TechnologyUniversity of Science and Technology of ChinaHefei 230031China Anhui Academy of Medical Sciences Hefei 230061China Anhui institute for Food and Drug Control Hefei 230051China CAS key laboratory of Geospace Environment University of Science and Technology of ChinaHefei 230026China

China has pledged to reach its dual-carbon goals(i.e.,carbon peak and carbon neutrality)at the end of *** reduce carbon emission in food preservation industry,the preservation effects of cold atmospheric plasma intermittent treatment(1 min/6 h each day,PL4)combined with 15℃ and 4℃ only on Qianxi tomato fruits during 7 d storage were *** indicated that the firmness,L*,sensory taste,glutathione(GSH)content,mineral(Fe,P,K)content,polyphenol oxidase activity of PL4 tomatoes were significantly increased than that in Control during earlier period storage,with worse weight loss,titratable acid,a*,b*,lycopene content,·OH radical scavenging capacity and same moisture content,total soluble solids,polysaccharide content,total phenolics content,total flavonoid content,ascorbic acid content,1,1-diphenyl-2-picrylhydrazyl radical scavenging capacity,pectin methylesterase ***,the power and R134a consumption of PL4 were highly decreased by around 56.4 kW·h and 0.3 g respectively during whole storage as compared to Control,and reduced more than 99.8%carbon emission based on equipment using *** in all,this study illustrated that PL4 treatment can be applied as an ecofriendly,low carbon and sustainable preservation strategy for short-term storage of fruits under 4℃ or higher temperature.

关键词： cold atmospheric plasma carbon reduction Qianxi tomato fruits food preservation

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Magneto-Elastic Coupling in a Sinusoidal Modulated Magnet Cr_(2)GaN

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Chinese Physics Letters 2022年第9期39卷 72-75页

作者： Hui-Can Mao Yu-Feng Li Qing-Yong Ren Mi-Hai Chu Helen E.Maynard-Casely Franz Demmel Devashibhai Adroja Hai-Hu Wen Yin-Guo Xiao Hui-Qian Luo Beijing National laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China university of Chinese Academy of Sciences Beijing 100049China National laboratory of Solid State Microstructures and Department of Physics Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China institute of High energy Physics Chinese Academy of SciencesBeijing 100049China Spallation Neutron Source Science center Dongguan 523803China School of advanced Materials Shenzhen Graduate SchoolPeking UniversityShenzhen 518055China Australian Centre for Neutron Scattering Australian Nuclear Science and Technology OrganisationLucas Heights NSW-2232Australia ISIS Facility Rutherford Appleton LaboratoryChiltonDidcot Oxon OX110QXUnited Kingdom Songshan Lake Materials laboratory Dongguan 523808China

We use neutron powder diffraction to investigate the magnetic and crystalline structure of Cr_(2)GaN.A magnetic phase transition is identified at T≈170 K,whereas no trace of structural transition is observed down to 6 *** Rietveld refinement with irreducible representations,the spin configuration of Cr ions in Cr_(2)GaN is depicted as an incommensurate sinusoidal modulated structure characterized by a propagating vector k=(0.365,0.365,0).Upon warming up to the paramagnetic state,the magnetic order parameter closely resembles to the temperature dependence of c-axis lattice parameter,suggesting strong magneto-elastic coupling in this ***,Cr_(2)Ga N provides a potential platform for exploration of magnetically tuned properties such as magnetoelectric,magnetostrictive and magnetocaloric effects,as well as their applications.

关键词： magnetic Elastic Coupling

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Correction to:Research on manufacture technology.of spherical fuel elements by dry-bag isostatic pressing

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nuclear Science and Techniques 2022年第11期33卷 21-21页

作者： Zhen-Ming Lu Wen-Ke Zhang Jie Zhang Xiang-Wen Zhou Kai-Hong Zhang Ma-Lin Liu Xuan-Ke Li Bing Liu Hubei Province key laboratory of Coal Conversion and new Carbon Materials Wuhan University of Science and TechnologyWuhan 430081China institute of nuclear and new energy technology Collaborative Innovation Center of Advanced Nuclear Energy TechnologyTsinghua UniversityBeijing 100084China

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