检索结果-内蒙古大学图书馆

SSRN 2022年

作者： Yu, Xiao Liu, Jiefeng Ru, Changlong Cai, Shiyu Wang, Jinyao Liu, Mengyuan Zhang, Dongpei Shen, Jian Yang, Chaohe Jin, Xin State Key Laboratory of Heavy Oil Processing College of Chemistry and Chemical Engineering China University of Petroleum Shandong Province Qingdao266580 China College of Chemical and Biological Engineering Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology Zhejiang University 38 Zheda Road Hangzhou310027 China College of Environment and Resources Xiangtan University Hunan Province Xiangtan411199 China

Lattice strained metal oxides often display enhanced catalytic activity and selectivity on activation of C-H, C=C, C=O and O-H bonds in bio-oxygenates. However, limited experimental studies have been conducted on the structure-sensitivity for tandem reactions, particularly on complicated surface redox chemical chain reactions over strained oxide materials. In this work, we employed transfer hydrogenation of levulinate as a representative example, to illustrate how lattice strain affects tandem oxidation (dehydrogenation, C-H/O-H bond cleavage) and reduction (hydrogenation, C=O bond saturation) reactions. The key finding is that, lattice strain at MnO x -CuO x boundaries within bimetallic MnCu oxides leads to a highly unsymmetrical strain across the interface and lattice distortion. Such unique behaviors further induce Jahn-Teller effect for electronic reconfiguration and field split for Mn 3d orbitals. Thus tandem H 2 generation and hydrogenation of levulinate to valerolactone can occur much more efficiently with a five-fold enhancement over monometallic oxide catalysts. Additional experimental studies also revealed an important induction period for conversion of ethyl levulinate. Detailed characterization of fresh and sintered catalyst samples further demonstrated the critical role of expansion of Mn-O facet and phase segregation on facilitated chemical chain reactions. The design principles discussed in this work could be potentially applied for other non-noble oxide catalysts in energy and environmental fields. © 2022, The Authors. All rights reserved.

关键词： Metals

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Intermediate phase-enhanced Ostwald ripening for the elimination of phase segregation in efficient inorganic CsPbIBr_(2)perovskite solar cells

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Science China materials 2021年第11期64卷 2655-2666页

作者： Wei Li Benjia Zhu Mathias Uller Rothmann Amelia Liu Weijian Chen Yen Yee Choo Narendra Pai Wenxin Mao Tian Zhang Qiaoliang Bao Xiaoming Wen Udo Bach Joanne Etheridge Yi-Bing Cheng Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu hydrogen ValleyFoshan 528200China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Department of Physics University of OxfordOxford OX13PUUnited Kingdom School of Physics and Astronomy Monash UniversityVictoria 3800Australia Centre for Micro-Photonics Swinburne University of TechnologyHawthorn 3122Australia Australian Research Council Centre of Excellence in Exciton Science Monash UniversityVictoria 3800Australia Department of Materials Science and Engineering Monash UniversityVictoria 3800Australia Department of Chemical Engineering Monash UniversityVictoria 3800Australia Commonwealth Scientific and Industrial Research Organization Manufacturing FlagshipClaytonVictoria 3168Australia Melbourne Centre for Nano fabrication 151 Wellington RoadClaytonVIC 3168Australia Monash Centre for Electron Microscopy Monash UniversityVictoria 3800Australia

Mixed halide perovskites with the ability to tune bandgaps exhibit attractive applications in tandem solar cells,building integrated photovoltaic and wavelength-tunable light-emitting ***,halide demixing under illumination or in the dark with a charge-carrier injection in both hybrid and inorganic perovskites results in bandgap instability and current-density-voltage(J-V)hysteresis,which can significantly hamper their ***,we demonstrate that halide segregation and J-V hysteresis in mixed halide inorganic CsPbIBr_(2)solar cells can be effectively mitigated by introducing an intermediate phase-enhanced Ostwald ripening through the control of the chemical composition in the CsPbIBr_(2)precursor *** amounts of either PbBr_(2)or CsI are incorporated into originally even molar amounts of PbBr_(2)and CsI precursor *** the PbBr_(2)-excess,we observed an enlarged perovskite grain size,no detectable halide phase segregation at the grain boundaries nor the perovskite/TiO2 interface,an increased minority carrier lifetime,a reduced J-V hysteresis,and an improved solar-cell ***,different CsI:PbBr_(2)stoichiometric ratios were found to have different effects on the performance of the perovskite solar *** excessive lead phase is reactive with the dimethyl sulfoxide(DMSO)in the precursor solution to form the Pb(I,Br)2·DMSO complex and the quasi-twodimensional(2D)CsPb_(2)(I,Br)5,which are conducive to Ostwald maturation and defect ***,the CsPbIBr_(2)solar cell with a PbBr_(2)-excess precursor composition reaches a power conversion efficiency(PCE)of 9.37%(stabilized PCE of 8.48%)and a maximum external quantum efficiency of over 90%.

关键词： solar cells phase segregation CsPbIBr_(2) cathodoluminescence transmission electron microscope

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Segregation behavior and microstructure evolution of 2219 aluminum alloy by directed energy deposition-arc

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materials Characterization 2025年 227卷

作者： Yunjun Fei Mingye Dong Quan Li Yue Zhao Fude Wang Chen Chen Aiping Wu State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment Department of Mechanical Engineering Tsinghua University Beijing 100084 China Capital Aerospace Machinery Corporation Limited Beijing 100076 China Key Laboratory for Advanced Materials Processing Technology Ministry of Education Beijing 100084 China Science and Technology on Space Physics Laboratory China Academy of Launch Vehicle Technology Beijing 100076 China

Segregation affects the solute content within the grains, as well as the content and distribution of the secondary phases at grain boundaries, leading to structural and property inhomogeneity. It also influences the microstructure evolution during the remelting and post-heating in directed energy deposition-arc (DED-Arc), ultimately impacting product performance in both as-built and heat-treated states. In this study, a 2219 aluminum alloy wall was fabricated using DED-Arc. Numerical simulation was employed to calculate the temperature field of the additive manufacturing process and solidification parameters. The segregation behavior and microstructure characteristics were analyzed. Both macrosegregation and microsegregation were observed in the as-built wall. Within a single layer, the Cu content is higher at the top where the metal solidifies last, than at the bottom where it solidifies first. The microsegregation is more severe in the first few layers due to the higher cooling rate. As the DED-Arc process progresses, eutectics enriched in the interlayer form a reticular network due to remelting, while a finer grain size is achieved through Cu enrichment and Al 3 Zr nucleants. As the layer-by-layer deposition process continues, the as-built wall alternates between coarse-grained unmelted intralayers, coarse-grained partially remelted intralayers with network-distributed eutectics, fine-grained remelted interlayers with network-distributed eutectics and fine-grained newly deposited interlayers.

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Cover Feature: Free-Standing Pearl-Chains-like MoO2Hierarchical Nanowires with Enhanced Pseudocapacitive Energy Storage (Batteries & Supercaps 9/2022)

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Batteries & Supercaps 2022年第9期5卷

作者： Changwei Shi Shihao Feng Xinyuan Li Jianyong Zhang Prof. Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 P. R. China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu hydrogen Valley Foshan 528200 P. R. China

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Bi-Functional Diaminopropane Additive Enables Stable Li Anodes and Highly Efficient Cathodes for High-Performance Li-Air Batteries

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advanced science (Weinheim, Baden-Wurttemberg, Germany) 2025年 e05539页

作者： Honghao Hu Qingxu Zhang Jiucong Liu Junjie Li Pingli Wu Caicai Li Peipei Du Huiqiao Li Xizheng Liu Key Laboratory of Flexible Optoelectronic Materials and Technology Ministry of Education School of Optoelectronic Materials & Technology Jianghan University Wuhan 430056 China. Institute for New Energy Materials and Low-Carbon Technologies School of Materials Science and Engineering Tianjin University of Technology Tianjin 300384 China. State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China.

Low round-trip efficiency and limited cycle durability remain significant challenges for commercial of Lithium-air batteries (LABs). This study introduces a novel electrolyte additive, diaminopropane (DAP), that simultaneously addresses anode stability and cathode reaction kinetics in ambient LABs. The proposed mechanism involves a bi-function approach: 1) at the anode, DAP spontaneously reacts with metallic Li to form Li-DAP, which subsequently cross-links with ether solvents to create a protective gel layer. This layer effectively mitigates Li dendrite formation and shields the anode from ambient moisture and CO corrosion. 2) At the cathode, DAP modifies the oxygen reduction pathway from surface-mediated to solution-mediated, while simultaneously acting as an efficient redox mediator during charging. This dual functionality results in a remarkable reduction of the initial charging potential from 4.2 to 3.4 V, accompanied by observed singlet oxygen quenching. The implemented DAP additive enables LABs to achieve unprecedented cycling stability, demonstrating continuous operation for 1000 h in ambient air while maintaining energy efficiency exceeding 70%. This work establishes an effective electrolyte additive strategy for developing high-performance ambient LABs through simultaneous anode protection and enhanced cathode reaction reversibility.

关键词： Li‐air batteries bi‐functional additive diaminopropane in situ gel layer redox mediators

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Prominent Josephson tunneling between twisted single copper oxide planes of Bi2Sr2-xLaxCuO6+y

arXiv

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arXiv 2023年

作者： Wang, Heng Zhu, Yuying Bai, Zhonghua Wang, Zechao Hu, Shuxu Xie, Hong-Yi Hu, Xiaopeng Cui, Jian Huang, Miaoling Chen, Jianhao Ding, Ying Zhao, Lin Li, Xinyan Zhang, Qinghua Gu, Lin Zhou, X.J. Zhu, Jing Zhang, Ding Xue, Qi-Kun State Key Laboratory of Low Dimensional Quantum Physics Department of Physics Tsinghua University Beijing100084 China Beijing Academy of Quantum Information Sciences Beijing100193 China Hefei National Laboratory Hefei230088 China The State Key Laboratory of New Ceramics and Fine Processing Tsinghua University Beijing100084 China Ji Hua Laboratory Guangdong Foshan528200 China International Center for Quantum Materials School of Physics Peking University Beijing100091 China Institute of Physics Chinese Academy of Sciences Beijing100190 China Saitama Wako351-0198 Japan Southern University of Science and Technology Shenzhen518055 China

Josephson tunneling in twisted cuprate junctions provides a litmus test for the pairing symmetry, which is fundamental for understanding the microscopic mechanism of high temperature superconductivity. This issue is rekindled by experimental advances in van der Waals stacking and the proposal of an emergent d+id-wave. So far, all experiments have been carried out on Bi2Sr2CaCu2O8+x (Bi-2212) with double CuO2 planes but show controversial results. Here, we investigate junctions made of Bi2Sr2-xLaxCuO6+y (Bi-2201) with single CuO2 planes. Our on-site cold stacking technique ensures uncompromised crystalline quality and stoichiometry at the interface. Junctions with carefully calibrated twist angles around 45°show strong Josephson tunneling and conventional temperature dependence. Furthermore, we observe standard Fraunhofer diffraction patterns and integer Fiske steps in a junction with a twist angle of 45.0±0.2°. Together, these results pose strong constraints on the d or d+id-wave pairing and suggest an indispensable isotropic pairing component. Copyright © 2023, The Authors. All rights reserved.

关键词： Van der Waals forces

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Delocalized Isoelectronic Heterostructured FeCoO_xS_y Catalysts with Tunable Electron Density for Accelerated Sulfur Redox Kinetics in Li-S batteries

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Angewandte Chemie - International Edition 2023年第47期62卷 e202311693-e202311693页

作者： Chen, Peng Wang, Tianyi He, Di Shi, Ting Chen, Manfang Fang, Kan Lin, Hongzhen Wang, Jian Wang, Chengyin Pang, Huan Institute for Innovative Materials and Energy Faculty of Chemistry and Chemical Engineering Yangzhou University Yangzhou 225002 China i-Lab and CAS Key Laboratory of Nanophotonic Materials and Devices Suzhou Institute of Nano-tech and Nano-bionics Chinese Academy of Sciences Suzhou 215123 China Helmholtz Institute Ulm (HIU) Ulm D-89081 Germany State Key Laboratory of Material Processing and Die and Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China National Base for International Science & Technology Cooperation School of Chemistry Xiangtan University Xiangtan 411105 China School of Materials Science and Engineering Harbin Institute of Technology (Shenzhen) Shenzhen 518055 China

High interconversion energy barriers, depressive reaction kinetics of sulfur species, and sluggish Li+ transport inhibit the wide development of high-energy-density lithium sulfur (Li−S) batteries. Herein, differing f... 详细信息

High interconversion energy barriers, depressive reaction kinetics of sulfur species, and sluggish Li⁺ transport inhibit the wide development of high-energy-density lithium sulfur (Li−S) batteries. Herein, differing from random mixture of selected catalysts, the composite catalyst with outer delocalized isoelectronic heterostructure (DIHC) is proposed and optimized, enhancing the catalytic efficiency for decreasing related energy barriers. As a proof-of-content, the FeCoO_xS_y composites with different degrees of sulfurization are fabricated by regulating atoms ratio between O and S. The relationship of catalytic efficiency and principal mechanism in DIHCs are deeply understood from electrochemical experiments to in situ/operando spectral spectroscopies i.e., Raman, XRD and UV/Vis. Consequently, the polysulfide conversion and Li₂S precipitation/dissolution experiments strongly demonstrate the volcano-like catalytic efficiency of various DIHCs. Furthermore, the FeCoO_xS_y-decorated cell delivers the high performance (1413 mAh g⁻¹ at 0.1 A g⁻¹). Under the low electrolyte/sulfur ratio, the high loading cell stabilizes the areal capacity of 6.67 mAh cm⁻² at 0.2 A g⁻¹. Impressively, even resting for about 17 days for possible polysulfide shuttling, the high-mass-loading FeCoO_xS_y-decorated cell stabilizes the same capacity, showing the practical application of the DIHCs in improving catalytic efficiency and reaching high electrochemical performance. © 2023 Wiley-VCH GmbH.

关键词： Adsorption and Catalytic Delocalized Isoelectronic Heterostructure Catalyst in-Situ Characterization Iso-e S and O Lithium Sulfur Battery

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A TiSe 2 -Graphite Dual Ion Battery: Fast Na-Ion Insertion and Excellent Stability

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Angewandte Chemie (International ed. in English) 2021年第34期60卷 18430-18437页

作者： Runtian Zheng Haoxiang Yu Xikun Zhang Yang Ding Maoting Xia Kangzhe Cao Jie Shu Alexandru Vlad Bao-Lian Su School of Materials Science and Chemical Engineering Ningbo University Ningbo 315211 Zhejiang China. Laboratory of Inorganic Materials Chemistry (CMI) University of Namur 61 rue de Bruxelles 5000 Namur Belgium. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 Hubei China. Henan Province Key Laboratory of Utilization of Non-Metallic Mineral in the South of Henan Xinyang Normal University Xinyang 464000 Henan China. Institute of Condensed Matter and Nanosciences Université Catholique de Louvain Place Louis Pasteur 1L4.01.02 1348 Louvain-la-Neuve Belgium.

The sodium dual ion battery (Na-DIB) technology is proposed as highly promising alternative over lithium-ion batteries for the stationary electrochemical energy-storage devices. However, the sluggish reaction kinetics of anode materials seriously impedes their practical implementation. Herein, a Na-DIB based on TiSe -graphite is reported. The high diffusion coefficient of Na-ions (3.21×10 -1.20×10 cm s ) and the very low Na-ion diffusion barrier (0.50 eV) lead to very fast electrode kinetics, alike in conventional surface capacitive storage systems. In-situ investigations reveal that the fast Na-ion diffusion involves four insertion stage compositions. A prototype cell shows a reversible capacity of 81.8 mAh g at current density of 100 mA g , excellent stability with 83.52 % capacity retention over 200 cycles and excellent rate performance, suggesting its potential for next-generation large scale high-performance stationary energy storage systems.

关键词： TiSe2 dual-ion batteries graphite cathodes reaction mechanisms sodium

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Single crystal metal-organic framework constructed by vertically self-pillared nanosheets and its derivative for oriented lithium plating

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Chinese Journal of Catalysis 2021年第9期42卷 1553-1560页

作者： Xiaomin Jia Shaowen Li Tu Sun Yanzhi Wang Yaqi Fan Chaochao Zhang Yang Xu Zuozhong Liang Haitao Lei Wei Zhang Yuye Zhou Yanhang Ma Haoquan Zheng Yue Ma Rui Cao Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationSchool of Chemistry and Chemical EngineeringShaanxi Normal UniversityXi’an 710119ShaanxiChina Center for Nano Energy Materials State Key Laboratory of Solidification ProcessingSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi'an 710072ShaanxiChina School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China School of Engineering Sciences in Chemistry Biotechnology and HealthDepartment of ChemistryDivision of Applied Physical ChemistryAnalytical ChemistryKTH Royal Institute of TechnologySE‐10691StockholmSweden

This vertically self‐pillared(VSP)structure extends the application range of traditional porous materials with facile mass/ion transport and enhanced reaction ***,we prepare a single crystal metal‐organic framework(MOF),employing the ZIF‐67 structure as a proof of concept,which is constructed by vertically self‐pillared nanosheets(VSP‐MOF).We further converted VSP‐MOF into VSP‐cobalt sulfide(VSP‐CoS2)through a sulfidation *** plays an important role in almost all battery technologies;for metallic batteries,lithium anodes exhibit a high theoretical specific capacity,low density,and low redox ***,during the half‐cell reaction(Li++e=Li),uncontrolled dendritic Li penetrates the separator and solid electrolyte interphase *** employed as a composite scaffold for lithium metal deposition,there are many advantage to using this framework:1)the VSP‐CoS2 substrate provides a high specific surface area to dissipate the ion flux and mass transfer and acts as a pre‐catalyst,2)the catalytic Co center favors the charge transfer process and preferentially binds the Li+with the enhanced electrical fields,and 3)the VSP structure guides the metallic propagation along the nanosheet 2D orientation without the protrusive *** these features enable the VSP structure in metallic batteries with encouraging performances.

关键词： Vertically self‐pillared structure Metal organic framework Pre‐catalyst preparation Lithium plating orientation Metallic battery

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Enhanced elastocaloric effect in Sc-doped TiNi shape memory alloys

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Scripta Materialia 2025年 265卷

作者： Zhao, Shuangshuang Zhang, Le Liang, Qianglong Liang, Chuanxin Wang, Lu He, Xiangwen Wang, Dong Frontier Institute of Science and Technology State Key Laboratory for Mechanical Behavior of Materials and Interdisciplinary Research Center of Frontier science and Technology Xi'an Jiaotong University Xi'an710049 China School of Physics MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter Xi'an Jiaotong University Xi'an710049 China China Nonferrous Metals Processing Technology Co. Ltd. Luoyang471039 China

We report a giant elastocaloric effect in Sc-doped TiNi shape memory alloys, demonstrating their potential for solid-state cooling applications. The solution-treated (Ti49.2Ni50.8)99.8Sc0.2 alloy achieves a high entropy change of ∼74 J/kg·K and a adiabatic temperature change (∆Tad) of 37.41 K, though it suffers from poor thermal cycling stability. However, after ageing at 623 K for 10 hours, the alloy retains a high ∆Tad of −31.56 K with coefficient of performance (COPmaterials) of 21. Furthermore, it demonstrates a stable ∆Tad of −15.05 K and a high COPmaterials of 32 under reduced stress after 100 loading cycles. Microstructural analysis reveals that the two-step B2-R-B19′ martensitic transformation, combined with the formation of Ni4Ti3 precipitates and Sc2O3/ScO particles, strengthens the matrix and enhances the cycling stability of the elastocaloric effect. This study demonstrates a pathway to achieve a giant elastocaloric effect in Sc-doped TiNi alloys, underscoring their promise for practical solid-state cooling technologies. © 2025 Acta Materialia Inc.

关键词： Thermal cycling

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