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Bonding-unsaturation-dependent superconductivity in P-rich sulfides

Matter and Radiation at Extremes 2022年第4期7卷 81-88页

作者： Xing Li Xiaohua Zhang Yong Liu Guochun Yang State Key Laboratory of Metastable Materials Science and Technology and Key Laboratory for Microstructural Material Physics of Hebei Province School of ScienceYanshan UniversityQinhuangdao 066004China Centre for Advanced Optoelectronic Functional Materials Research and Key Laboratory for UV Light-Emitting Materials and Technology of Northeast Normal University Changchun 130024China

The covalent frameworks found in certain compounds,such as the S–H skeleton in H3S and the H cage in LaH10,play an essential role in their *** compounds have the feature of bonding unsaturation(a deficiency of electrons in their covalent bonding)in *** an understanding of the relationship between superconductivity and bonding unsaturation in these materials can provide new ideas for the design of superconducting *** this work,we explored the high-pressure phase diagram of binary P–S compounds using first-principles swarm structural *** addition to the previously reported P2S and P3S structures,we identified that P5S,P8S,and P11S also have a common structural character of six-coordinated octahedral networks;however,their bonding unsaturation are distinct due to the different valence electron numbers and unequal ratios of P and S *** features provide an ideal model for exploring the bonding-unsaturation dependence of *** estimated the average bonding unsaturation of these P-rich compounds based on the valence electron numbers and the coordination numbers of the central P/S ***,the resultant average bonding unsaturation was found to be proportional to the predicted superconducting transition *** finding was also verified in MH9(M=Y,Th,and Pr)and doped H3S(Si,C,and P)*** work provides an opportunity to gain a deeper understanding of bonding-unsaturation-dependent superconductivity.

关键词： saturation bonding superconductivity

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Sulfur-Doped Enhanced Znmn2o4 Spinel for High-Capacity Zinc-Ion Batteries: Facilitating Charge Transfer

SSRN

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SSRN 2024年

作者： Yuan, Jingjing Xi, Wenyong Qiao, Yifan Li, Yifan He, Junjie Xu, Hui Zhang, Wenyao He, Guangyu Chen, Haiqun Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology Advanced Catalysis and Green Manufacturing Collaborative Innovation Center Changzhou University Changzhou213164 China Key Laboratory for Soft Chemistry and Functional Materials Ministry of Education Nanjing University of Science and Technology Nanjing210094 China

ZnMn2O4 spinel is considered a promising cathode material for zinc-ion batteries due to its superior Zn2+ storage capability. However, the widespread utilization of ZnMn2O4 spinel as a high-capacity cathode material is impeded by challenges such as its insufficient electrical conductivity. To tackle this limitation, we have employed a sulfur doping approach by substituting sulfur for oxygen atoms within the ZnMn2O4 lattice structure. After theoretical calculation, the charge exchange between metal Zn/Mn and surrounding coordinated atoms is enhanced after sulfur doping, the charge transfer increases and the conductivity is improved. As a result, the sulfur-doped ZnMn2O4 spinel effectively enhances the electrical conductivity, improving its electrochemical discharge capacity. Furthermore, the results revealed that a doping level of 20% provided the greatest enhancement in capacitance, achieving a specific capacity of 220.1 mAh g-1. However, when the sulfur doping level is excessively high, an excess of sulfur introduces impurity energy levels and increases charge transfer resistance among other adverse factors, thereby resulting in adverse effects that degrade the electrochemical performance of the material and lead to poorer outcomes. Therefore, when modifying ZnMn2O4 cathode materials, it is crucial to strike a balance between different factors to achieve optimal performance. © 2024, The Authors. All rights reserved.

关键词： Manganese compounds

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Recent progress of flexible rechargeable batteries

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science Bulletin 2024年第23期69卷 3730-3755页

作者： Xiao Zhu Haoran Zhang Yongxin Huang Er He Yun Shen Gang Huang Shouyi Yuan Xiaoli Dong Ye Zhang Renjie Chen Xinbo Zhang Yonggang Wang Department of Chemistry Shanghai Key Laboratory of Molecular Catalysis and Innovative MaterialsInstitute of Fiber Electronic Materials and DevicesCollaborative Innovation Center of Chemistry for Energy Materials(iChEM)Fudan UniversityShanghai 200433China State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China Beijing Key Laboratory of Environmental Science and Engineering School of Material Science&EngineeringBeijing Institute of TechnologyBeijing 100081China National Laboratory of Solid State Microstructures Jiangsu Key Laboratory of Artificial Functional MaterialsChemistryBiomedicine Innovation CenterCollaborative Innovation Center of Advanced MicrostructuresCollege of Engineering&Applied ScienceNanjing UniversityNanjing 210023China National and Local Joint Engineering Laboratory for Lithium-ion Batteries and Materials Preparation Technology Key Laboratory of Advanced Battery Materials of Yunnan ProvinceFaculty of Metallurgical and Energy EngineeringKunming University of Science and TechnologyKunming 650093China

The rapid popularization of wearable electronics,soft robots and implanted medical devices has stimulated extensive research in flexible batteries,which are bendable,foldable,knittable,wearable,and/or *** from these distinct characteristics,flexible batteries can be seamlessly integrated into various wearable/implantable devices,such as smart home systems,flexible displays,and implantable *** contrast to conventional lithium-ion batteries necessitating the incorporation of stringent current collectors and packaging layers that are typically rigid,flexible batteries require the flexibility of each component to accommodate diverse shapes or ***,significant advancements have been achieved in the development of flexible electrodes,current collectors,electrolytes,and flexible structures to uphold superior electrochemical performance and exceptional *** this review,typical structures of flexible batteries are firstly introduced and classified into mono-dimensional,twodimensional,and three-dimensional structures according to their ***,five distinct types of flexible batteries,including flexible lithium-ion batteries,flexible sodium-ion batteries,flexible zinc-ion batteries,flexible lithium/sodium-air batteries,and flexible zinc/magnesium-air batteries,are discussed in detail according to their configurations,***,related comprehensive analysis is introduced to delve into the fundamental design principles pertaining to electrodes,electrolytes,current collectors,and integrated structures for various flexible ***,the developments and challenges of flexible batteries are summarized,offering viable guidelines to promote the practical applications in the future.

关键词： Typical structure of flexible batteries Flexible lithium-ion batteries Flexible sodium-ion batteries Flexible zinc-ion batteries Flexible lithium/sodium-air batteries Flexible zinc/magnesium-air batteries

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Structural defects in MAX phases and their derivative MXenes:A look forward

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Journal of Materials science & technology 2020年第3期38卷 205-220页

作者： Hui Zhang Tao Hu Xiaohui Wang Yanchun Zhou Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Energy Geoscience Division Lawrence Berkeley National LaboratoryCA 94720USA Institute for Materials Science and Devices Suzhou University of Science and TechnologySuzhou 215009China Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Materials&Processing TechnologyBeijing 100076China

MAX phases and corresponding 2 D derivative MXenes have attracted considerable interests due to not only their fascinating mechanical,physical and chemical properties but also their unique atomically laminated *** the most important way to tailor the materials properties,the structural defects in MAX phases and MXenes have been extensively investigated but lack of systematic survey although six reviews and two books in this field have been *** make the defect-engineering based materials design and exploration more efficient and targeted,this paper provides a review of the recent progress on the nature of different-dimensional structural defects and their influence on the properties,in the hope of facilitating the conversion of established experiment and simulation results into practical guideline for optimizing defects in a broad range of demand-oriented materials development in the ***,unsolved issues on the structural defects of these scientifically and technologically important materials are also highlighted for the future study.

关键词： Crystal defects Carbides TEM MAX phases MXenes

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Visible light-mediated NHCs and photoredox co-catalyzed radical 1,2-dicarbonylation of alkenes for 1,4-diketones

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science China Chemistry 2022年第10期65卷 1938-1944页

作者： Lihong Wang Jiaqiong Sun Jiuli Xia Mingrui Li Lianjin Zhang Ruiyang Ma Guangfan Zheng Qian Zhang Jilin Province Key Laboratory of Organic Functional Molecular Design&Synthesis Department of ChemistryNortheast Normal UniversityChangchun 130024China School of Environment Northeast Normal UniversityChangchun 130117China Department of Chemistry Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Korea State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic ChemistryChinese Academy of Sciences345 Lingling LuShanghai 200032China

Alkenes are ubiquitous,and the difunctionalization of alkenes represents one of the most practical approaches for the construction of value-added *** of alkenes provides direct access to value-added 1,4-dicarbonyl ***,selectivity control for unsymmetric 1,2-dicarbonylation is of great *** herein describe NHCs and photocatalysis co-catalyzed three-component radical 1,2-dicarbonylation of alkenes by distinguishing two carbonyl groups,providing structurally diversified 1,*** properties of acyl radical and NHCs-stabilized ketyl radical contributed to selectivity *** radicals are rapidly added to alkenes delivering alkyl radicals,which undergo subsequent radicalradical cross-coupling with NHCs-stabilized ketyl-type radicals,affording 1,2-dicarbonylation *** transformation features mild reaction conditions,broad substrate scope,and excellent selectivity,providing a general and practical approach for the dicarbonylation of olefins.

关键词： NHCs photocatalysis radical 1,2-dicarbonylation alkenes 1 4-diketones

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Polarity-triggered anti-Kasha system for high-contrast cell imaging and classification

Aggregate

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Aggregate 2023年第2期4卷 216-226页

作者： Junyi Gong Peifa Wei Junkai Liu Yuncong Chen Zheng Zhao Weijun Zhao Huilin Xie Chao Ma Jacky W.Y.Lam Kam Sing Wong Ying Li Ben Zhong Tang Shenzhen Institute of Aggregate Science and Technology School of Science and EngineeringThe Chinese University of Hong KongShenzhenChina Department of Chemistry Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and ReconstructionInstitute for Advanced StudyState Key Laboratory of Molecular NanoscienceDivision of Life Science and Department of Chemical and Biological EngineeringThe Hong Kong University of Science and TechnologyClear Water BayKowloonChina Institutes of Physical Science and Information Technology Anhui UniversityHefeiChina Department of Physics HKUSTKowloonChina Guangzhou Municipal and Guangdong Provincial Key Laboratory of Molecular Target and Clinical Pharmacology The NMPA and State Key Laboratory of Respiratory DiseaseInnovation Research Center for AIE Pharmaceutical BiologySchool of Pharmaceutical Sciences and the Fifth Affiliated HospitalGuangzhou Medical UniversityGuangzhouChina Center for AIE Research Shenzhen Key Laboratory of Polymer Science and TechnologyGuangdong Research Center for Interfacial Engineering of Functional MaterialsCollege of Material Science and EngineeringShenzhen UniversityShenzhenChina Center for Aggregation-Induced Emission SCUT-HKUST Joint Research InstituteState Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhouChina AIE Institute Guangzhou Development DistrictHuangpuChina

Kasha’s rule,which states that all exciton emissions occur from the lowest excited state and are independent of excitation energy,makes high-energy excitons difficult to use and severely hinders the widespread applications of organic photoluminescent materials in the real *** decades,scientists have tried to break this rule to unleash the power of high-energy excitons,but only minimal progress has been achieved,with no rational guiding principles provided,and few applications *** far,breaking Kasha’s rule has remained a purely academic *** this paper,we introduce a design principle for a purely organic anti-Kasha system and synthesise a series of compounds based on the design *** predicted,these compounds all display evident S_(2) emissions in dilute *** addition,we introduce a highly accurate(over 90%)convolutional neural network as an assistant for the classification of cells using anti-Kasha luminogens,thereby providing a new application direction for anti-Kasha systems.

关键词： anti-Kasha cell classification excited-state dynamics fluorescence

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Particle packing theory guided multiscale alumina filled epoxy resin with excellent thermal and dielectric performances

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Journal of Materiomics 2022年第5期8卷 1058-1066页

作者： Qi-Kun Feng Chang Liu Dong-Li Zhang Yan-Hui Song Kai Sun Hai-Ping Xu Zhi-Min Dang State Key Laboratory of Power System Department of Electrical EngineeringTsinghua UniversityBeijing100084China School of Chemistry and Chemical Engineering Xi'an University of Science and TechnologyXi'an710054China Shanghai Engineering Research Center of Advanced Thermal Functional Materials Shanghai Polytechnic UniversityShanghai201209China

Polymers and composites with high thermal conductivity are promising yet challenging for the growing demand of thermal management in electrical and electronic *** by the closest packing model,a multiscale filling Al_(2)O_(3) strategy was designed and incorporated with epoxy resin(EP)to form high thermal conductive composites in this *** composites with single filler loading were also *** microstructures,thermal,rheological,and dielectric characteristics of the multiscale filling Al_(2)O_(3)/EP composites have been *** with single-scale Al_(2)O_(3) filled epoxy based composites,it is found that the multiscale filling Al_(2)O_(3)/EP composites exhibit higher thermal conductivity under the same filler loading of 50 vol%,which is attributed to the efficient heat conduction paths formed by appropriate multiscale ***,a remarkably improved thermal conductivity of 2.707 W m^(-1) K^(-1) was acquired in Al_(2)O_(3)/EP composites at filler loading of 50 vol%(5 mm Al_(2)O_(3)(26.67 vol%),30 mm Al_(2)O_(3)(27.41 vol%)and 70 mm Al_(2)O_(3)(45.92 vol%)),which is about 1300%higher than that of the pure epoxy *** addition,the dielectric constant of the Al_(2)O_(3)/EP composites were significantly improved while keeping the dielectric loss almost *** finite element simulation further verified the effectiveness of improving the thermal conductivity of materials in the heat dissipation of electrical ***,this research provides a simple strategy for manufacturing high thermal conductive composite materials with a wide range of potential applications as packaging materials.

关键词： Closest packing model Epoxy composites Alumina Thermal conductivity Dielectric property

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Temperature‑Regulating Phase Change Fiber Scaffold Toward Mild Photothermal–Chemotherapy

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advanced Fiber Materials 2022年第6期4卷 1669-1684页

作者： Lei Chen Xiaoqing Sun Kai Cheng Paul D.Topham Mengmeng Xu Yifan Jia Donghua Dong Shuo Wang Yuan Liu Linge Wang Qianqian Yu South China Advanced Institute for Soft Matter Science and Technology School of Emergent Soft MatterGuangdong Provincial Key Laboratory of Functional and Intelligent Hybrid Materials and DevicesSouth China University of TechnologyGuangzhou 510640China Chemical Engineering and Applied Chemistry School of Infrastructure and Sustainable EngineeringCollege of Engineering and Physical SciencesAston UniversityBirmingham B47ETUK

Photothermal therapy(PTT)is a treatment that increases the temperature of tumors to 42–48℃,or even higher for tumor *** has sparked a lot of attention due to its ability to induce apoptosis or increase sensitivity to *** heat not only kills the tumor cells,but also damages the surrounding healthy tissue,reducing therapeutic accuracy and increasing the possible side ***,a phase change fiber(PCF)scaffold serving as a thermal trigger in mild photothermal–chemo tumor therapy is developed to regulate temperature and control drug *** prepared PCFs,comprised of hollow carbon fibers(HCFs)loaded with lauric acid as a phase change material(PCM),can effectively store and release any excess heat generated by irradiating with a near-infrared(NIR)laser through the reversible solid–liquid transition process of the *** this feature,the optimal PTT temperature of implanted PCF-based composite scaffolds was identified for tumor therapy with minimal normal tissue *** addition,controlled release of chemotherapeutic drugs and heat shock protein(HSP)inhibitors from the PCF-based composite scaffolds have been shown to improve the efficacy of mild *** developed PCF-based scaffold sheds light on the development of a new generation of therapeutic scaffolds for thermal therapy.

关键词： Phase change fiber Temperature regulation Controlled drug release Heat shock protein Mild photothermal-chemotherapy

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Roadmap for rechargeable batteries:present and beyond

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science China Chemistry 2024年第1期67卷 13-42页

作者： Sen Xin Xu Zhang Lin Wang Haijun Yu Xin Chang Yu-Ming Zhao Qinghai Meng Pan Xu Chen-Zi Zhao Jiahang Chen Huichao Lu Xirui Kong Jiulin Wang Kai Chen Gang Huang Xinbo Zhang Yu Su Yao Xiao Shu-Lei Chou Shilin Zhang Zaiping Guo Aobing Du Guanglei Cui Gaojing Yang Qing Zhao Liubing Dong Dong Zhou Feiyu Kang Hu Hong Chunyi Zhi Zhizhang Yuan Xianfeng Li Yifei Mo Yizhou Zhu Dongfang Yu Xincheng Lei Jianxiong Zhao Jiayi Wang Dong Su Yu-Guo Guo Qiang Zhang Jun Chen Li-Jun Wan CAS Key Laboratory of Molecular Nanostructure and Nanotechnology CAS Research/Education Center for Excellence in Molecular SciencesBeijing National Laboratory for Molecular Sciences(BNLMS)Institute of ChemistryChinese Academy of Sciences(CAS)Beijing 100190China University of Chinese Academy of Sciences.Beijing 100049 China Institute of Advanced Battery Materials and Devices Faculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China Key Laboratory of Advanced Functional Materials Ministry of EducationBeijing University of TechnologyBeijing 100124China Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China State Key Laboratory of Chemistry and Utilization of Carbon-Based Energy Resources College of ChemistryXinjiang UniversityUrumqi 830046China Department of Chemical Engineering Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChangchun 130022China Institute for Carbon Neutralization College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035China School of Chemical Engineering and Advanced Materials The University of AdelaideAdelaide 5000Australia Qingdao Industrial Energy Storage Research Institute Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdao 266101China Frontiers Science Center for New Organic Matter Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education)College of ChemistryNankai UniversityTianjin 300071China College of Chemistry and Materials Science Jinan UniversityGuangzhou 511443China Tsinghua Shenzhen International Graduate School Tsinghua UniversityShenzhen 518055China Department of Materials Science and Engineering City University of Hong KongHong Kong 999077China Division of Energy Storage Dalian National Laboratory for Clean Energy(DNL)Dalian Institute of Chem

Rechargeable batteries currently hold the largest share of the electrochemical energy storage market,and they play a major role in the sustainable energy transition and industrial decarbonization to respond to global climate *** to the increased popularity of consumer electronics and electric vehicles,lithium-ion batteries have quickly become the most successful rechargeable batteries in the past three decades,yet growing demands in diversified application scenarios call for new types of rechargeable *** efforts are made to developing the next-generation post-Li-ion rechargeable batteries,which include,but are not limited to solid-state batteries,lithium–sulfur batteries,sodium-/potassium-ion batteries,organic batteries,magnesium-/zinc-ion batteries,aqueous batteries and flow *** the great achievements,challenges persist in precise understandings about the electrochemical reaction and charge transfer process,and optimal design of key materials and interfaces in a *** roadmap tends to provide an overview about the current research progress,key challenges and future prospects of various types of rechargeable *** computational methods for materials development,and characterization techniques will also be discussed as they play an important role in battery research.

关键词： energy storage rechargeable batteries battery materials electrochemistry

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Microstructure and Ablation Behaviour of C/C-Sic-Zrc-Cu composites Prepared by Reactive Melt Infiltration

SSRN

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SSRN 2024年

作者： Wang, Shuai Yin, Jian Xiefeng, Minyu Tang, Lei Xiong, Xiang Zhang, Hongbo Wen, Qingbo Ma, Denghao Tianshan, Jinglv Zuo, Jinglv State Key Laboratory of Powder Metallurgy Central South University Changsha410083 China Aerospace Research Institute of Materials & Processing Technology Key Laboratory of Advanced Functional Composite Materials Technology Beijing100076 China Hunan Boyun New Materials CO.LTD Changsha410083 China

To satisfy the requirements for the new generation solid rocket motors on highly ablation-resistant throat materials, an idea of merging passive and active thermal protection was applied to modify carbon/carbon composites. In this study, SiC and ZrC were used as passive thermal protection materials along with the active thermal protection material Cu to modify the C/C composites. C/C-SiC-ZrC-Cu composites were prepared by two-step reactive melt infiltration, which involved the infiltration of Si/Zr followed by Cu/Ti. The Cu content of the C/C-SiC-ZrC composites was controlled by controlling the open porosity of the porous C/C-SiC-ZrC composites. Microstructure, composition and ablation resistance of the C/C-SiC-ZrC-Cu composites were investigated. The results showed that the composites with high Cu content and density exhibited excellent short-term ablation resistance under the 42kW plasma flame, with a negative linear ablation rate after 20s of ablation. The active heat dissipation of Cu during the ablation process results in a significant reduction of the thermal response temperature on the composite surface. Moreover, the generated Si-Ti-Zr-O layer could form an effective barrier to protect the matrix. © 2024, The Authors. All rights reserved.

关键词： Microstructure

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