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Novel layered K0.7Mn0.7Ni0.3O2 cathode material with enlarged diffusion channels for high energy density sodium-ion batteries

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Science China Materials 2020年第7期63卷 1163-1170页

作者： Jinghui Chen Zhitong Xiao Jiashen Meng Jinzhi Sheng Yanan Xu Junjun Wang Chunhua Han Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China

As promising,low-cost alternatives of lithiumion batteries for large-scale electric energy storage,sodiumion batteries(SIBs)have been studied by many ***,the relatively large size of Na+leads to sluggish diffusion kinetics and poor cycling stability in most cathode materials,restricting their further *** this work,we demonstrated a novel K+-intercalated Mn/Ni-based layered oxide material(K0.7Mn0.7Ni0.3O2,denoted as KMNO)with stabilized and enlarged diffusion channels for high energy density SIBs.A spontaneous ion exchange behavior in forming K0.1Na0.7Mn0.7Ni0.3O2between the KMNO electrode and the sodium ion electrolyte was clearly revealed by in situ X-ray diffraction and ex situ inductively coupled plasma *** interlayer space varied from 6.90 to 5.76?,larger than that of Na0.7Mn0.7Ni0.3O2(5.63?).The enlarged ionic diffusion channels can effectively increase the ionic diffusion coefficient and simultaneously provide more K+storage sites in the product *** a proof-of-concept application,the SIBs with the as-prepared KMNO as a cathode display a high reversible discharge capacity(161.8 mA h g-1at0.1 A g-1),high energy density(459 W h kg-1)and superior rate capability of 71.1 mA h g-1at 5 A *** work demonstrates that the K+pre-intercalation strategy endows the layered metal oxides with excellent sodium storage performance,which provides new directions for the design of cathode materials for various batteries.

关键词： K0.7Mn0.7Ni0.3O2 K^+pre-intercalation enlarged layered structure high energy density sodium-ion batteries

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Enhanced Thermoelectric Properties of N-Type Cosb3-Based Composites by Incorporating in Particles

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SSRN 2022年

作者： Xie, Wenhao Su, Xanli Zheng, Yun Zhu, Bo Cheng, Xin Wang, Ziyu Key Laboratory of Optoelectronic Chemical Materials and Devices Ministry of Education Jianghan University Wuhan430056 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China The Institute of Technological Sciences Wuhan University Wuhan430072 China

Thermoelectric devices that are made of n-and p-type materials in series has been well known and applied owing to the ability that convert waste heat into electric energy. Among them, environmentally friendly and cheap skutterudite materials have been studied as the main object. In this work, n-type CoSb3 based materials were synthesized via non-filling method. The thermoelectric properties were systematically measured via various method and microstructure and morphology was characterized. Finally, the PF maximum value is 3642.3 μW/mK2 at 723 K for Co0.91Ni0.09Sb3/1wt% In sample and the highest ZT value of 1.01 was attained for the Co0.91Ni0.09Sb3/2wt%In thermoelectric ingot. These results indicate that non-filling method could improve the thermoelectric performance of n-type CoSb3 based materials. © 2022, The Authors. All rights reserved.

关键词： Waste heat

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Preparation of Low Molecular Weight Sodium Alginate with High Biological Activity by Tempo-Mediated Oxidation

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SSRN 2024年

作者： Wang, Wenyuan Zhao, Xinxin Yan, Lisi Yang, Feng Yang, Jing Li, Binbin Wang, Xinyu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong L aboratory Xianhu hydrogen Valley Foshan528200 China Hainan Institute Wuhan University of Technology Sanya572000 China Biomedical Materials and Engineering Research Center of Hubei Province Wuhan University of Technology Wuhan430070 China School of Foreign Languages Wuhan University of Technology Wuhan430070 China Department of Stomatology Zhongnan Hospital of Wuhan University Wuhan430060 China

In this study, low molecular weight sodium alginate was prepared by oxidizing the alginate solution with TEMPO/NaBr/NaClO and explored its potential application in tissue engineering. FTIR, UV-vis and NMR showed that the chemical structure of sodium alginate was not significantly changed by oxidation. The results of GPC and quantitative tests on carboxyl and aldehyde groups showed that the molecular weight of oxidized sodium alginate decreased gradually (2058.97, 544.39, 164.89, 94.92 kDa) with the increase of the ratio of oxidizing agent NaClO to SA (0, 0.25, 1.00, 2.00 mmol/g), and the content of carboxyl groups increased slowly (2.48, 4.27, 4.57, 4.70 mmol/g), no aldehyde group was found in the product, which was consistent with the results of XRD and TGA detection. We speculate that when the TEMPO system oxidizes the non-specific hydroxyl groups on the sugar ring of sodium alginate, it will also destroy the 1-4 glycosidic bonds between the segments, and the aldehyde group only exists as an intermediate product. In addition, preliminary in vitro biodegradation and cell compatibility tests showed that sodium alginate has better degradation properties after oxidation and exhibited a better ability to promote L929 cell proliferation under high oxidation levels and low concentrations. © 2024, The Authors. All rights reserved.

关键词： Aldehydes

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Differentiation of Chemisorption and Physisorption of Carbon Dioxide on Imidazolium-type Poly(ionic liquid)Brushes

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Journal of Wuhan University of technology(Materials Science) 2020年第4期35卷 750-757页

作者： ZHANG Dongyu QU Rong ZHANG Haining ZHANG Fangfang Technology Center China Tobacco Henan Industrial Co.Ltd.Zhengzhou 450000China Non-power Nuclear Technology Collaborative Innovation Center Hubei University of Science and TechnologyXianning 437100China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Amine-functionalized imidazolium-based poly(ionic liquid)brushes on mesoporous silica were synthesized via"grafting through"technique and were applied as model sorbents to understand physisorption and chemisorption of carbon dioxide *** experimental results reveal that the total adsorption capacity of model sorbents derived from temperature programmed desorption(TPD)approach reaches 1.72 mmol·g^-1 that is much higher than the sum of adsorption capacity of bare mesoporous silica and free polymers at 25℃under carbon dioxide partial pressure of 0.2 *** proposed physical adsorption and chemical adsorption of carbon dioxide molecules in TPD response curves were validated by volumetric desorption *** is also observed that physical adsorption is completely reversible and chemical adsorption is *** results demonstrate that the temperature programmed desorption technique is an effective approach to differentiate chemisorption and physisorption of gaseous species on solid sorbents,which is beneficial for understanding of adsorption mechanism and materials design.

关键词： adsorption surface-attachment poly(ionic liquid) grafting through carbon dioxide

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A facile synthesis of hierarchically porous graphene for high-performance lithium storage

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New Journal of Chemistry 2022年第21期46卷 9999-10003页

作者： Chenming Feng Yi Lu Yixuan Liu Xiaoyu Yang Ge Tian State Key Laboratory of Advanced Technology for Materials Synthesis and Processing & Shenzhen Research Institute & Joint Laboratory for Marine Advanced Materials in Pilot National Laboratory for Marine Science and Technology (Qingdao) Wuhan University of Technology Wuhan China Institut für Anorganische Chemie und Strukturchemie Heinrich-Heine-Universität Düsseldorf Universitätsstraße 1 Düsseldorf 40225 Germany

Hierarchically porous graphene with macro-mesopores is highly desired for enhancing lithium storage. However, it is still not easy to construct such materials with hierarchical porosity. Herein, hierarchical porous graphene was successfully fabricated via two-step calcination. The as-prepared sample exhibits an excellent reversible capacity of 545 mA h g⁻¹ at 5 A g⁻¹ after 700 cycles.

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Achieving Wideband Electromagnetic Wave Absorbing Performance for Pmma-Based Composites Foam by Designing the Alternating Directional (Ad) Microporous Structure

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SSRN 2023年

作者： Zhou, Danfeng Yu, Zirui Yuan, Huan Luo, Guoqiang Hu, Ruofei Jiang, Xueliang Shen, Qiang Hubei Key Laboratory of Plasma Chemistry and New Materials School of Material Science and Engineering Wuhan Institute of Technology Hubei Wuhan430205 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China School of Automotive Engineering Wuhan University of Technology Wuhan430070 China Department of Food Science & Chemical Engineering Hubei University of Arts and Science Xiangyang441053 China

Good impedance matching and attenuation ability of electromagnetic wave absorbing (EMA) materials are required to broaden the effective absorbing bandwidth (EAB) and lower minimum reflection loss (RLmin), achieving high EMA performance. Here we report a PMMA- based composite foam with alternating and directional (AD) microporous structure with broadened EAB of 3.53 GHz (8.49-12.02 GHz) and lowers RLmin of -19.35 dB, was manufactured via the one-step physical constraint foaming technology. Structural studies reveal that the AD microporous structure can induce the CNTs oriented distribution to improve effective concentration of CNTs, achieving excellent impedance matching. Meanwhile, it can also generate a large number of parallel-plate capacitors among the multiple interfaces to promote interfacial polarization, including enhancement of multiple reflection and scattering of electromagnetic wave at the multiple interfaces, endowing composites foam with high attenuation ability. This study lays the foundation for rational design and synthesis of EMA materials for broadband EMA performance. © 2023, The Authors. All rights reserved.

关键词： Electromagnetic wave absorption

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High-throughput data-driven interface design of high-energy-density polymer nanocomposites

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Journal of Materiomics 2020年第3期6卷 573-581页

作者： Zhong-Hui Shen Yang Shen Xiao-Xing Cheng Han-Xing Liu Long-Qing Chen Ce-Wen Nan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and DevicesWuhan University of TechnologyWuhan430070China School of Materials Science and Engineering State Key Lab of New Ceramics and Fine ProcessingTsinghua UniversityBeijing100084China Department of Materials Science and Engineering The Pennsylvania State UniversityUniversity ParkPA16802United States

Understanding the interface effect in dielectric nanocomposites is crucial to the enhancement of their *** this work,a data-driven interface design strategy based on high-throughput phase-field simulations is developed to study the interface effect and then optimize the permittivity and breakdown strength of ***,we use two microscopic features that are closely related to the macroscopic dielectric properties,the thickness and permittivity of the interface phases,to evaluate the role of interfaces in experimental configuration,and thus provide quantitative design schemes for the interfacial *** the polyvinyl difluoride(PVDF)-BaTiO_(3) nanocomposite as an example,the calculation results demonstrate that the interfacial polarization could account for up to 83.6% of the increase in the experimentally measured effective permittivity of the *** on the interface optimized strategy,a maximum enhancement of ~156% in the energy density could be achieved by introducing an interface phase with d/r=0.55 and ε_(interface)/ε_(filler)=0:036,compared to the pristine ***,the present work not only provides fundamental understanding of the interface effect in dielectric nanocomposites,but also establishes a powerful data-driven interface design framework for such materials that could also be easily generalized and applied to study interface issues in other functional nanocomposites,such as solid electrolytes and thermoelectrics.

关键词： Interface Polymer nanocomposites Energy storage Data-driven Phase-field simulation

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Recent advances in g-CN-based heterojunction photocatalysts

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Journal of Materials Science & technology 2020年第21期56卷 1-17页

作者： Yunfeng Li Minghua Zhou Bei Cheng Yan Shao College of Environmental and Chemical Engineering Xi’an Polytechnic UniversityXi’an710000China Hubei Key Laboratory of Wudang Local Chinese Medicine Research Hubei University of MedicineShiyan 442000China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Department of Outpatient Taihe HospitalHubei University of MedicineShiyan 442000China

Semiconductor heterojunction photocatalysts have received much concern due to their great application prospect in solar energy utilization and *** construction of heterostructure with two or more semiconductor materials can integrate the advantages of multi-components to simultaneously improve the photo-induced charges separation,extend visible light absorption range and retain the high redox ability of ***,constructing of g-C3 N4-based heterostructure has become a hot focus due to the multiple merits of g-C3 N4,such as facile synthesis,high stability,unique optical and electronic *** review tries to give a comprehensive introduction and provide the possible tendency in design and fabrication of g-C3 N4-based heterojunction photocatalysts,especially in rational synthesis of type-II heterojunction,direct Z-scheme heterojunction,new type of S-scheme heterojunction,p-n heterojunction and Schottky ***,the special charges transfer mechanisms of g-C3 N4-based heterojunctions are discussed and their potential applications in photocatalytic water splitting,photo-degradation of contaminants and photo-reduction of CO2 into fuels are also ***,we attempt to propose some crucial issues based on the current research,which should be further investigated and resolved in this interesting research area.

关键词： Photocatalysis g-C3N4 Heterojunction Z-scheme S-scheme

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Improving the Ohmic Polarization of High-Temperature Proton Exchange Membrane Fuel Cells Using Crosslinked Polybenzimidazole Membranes Containing Acidophilic Quaternary Ammonium Groups by One-Step Strategy

SSRN

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SSRN 2023年

作者： Li, Jin Liu, Guoliang Zhang, Fangfang Liao, Jun Tang, Haolin Zhang, Haining State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Nr. 122 Luoshi Rd. Wuhan430070 China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Foshan528200 China Hubei Key Laboratory of Fuel Cell Technology Wuhan University of Technology Wuhan430070 China School of Nuclear Technology and Chemistry & Biology Hubei University of Science and Technology Nr. 88 Xianning Avenue Xianning437100 China Hubei Han-Tech Co. Ltd Nr. 116 Linju Street Yuanan444200 China

Ingenious crosslinked network structure in phosphoric acid doped polybenzimidazole membranes can mitigate the mutual restriction of proton conductivity and mechanical properties. However, the complicated synthesis of tailored macromolecular crosslinker and the time-consuming post-treatment hinder their practical application as high temperature proton exchange membranes. Herein, crosslinked polybenzimidazole membranes are synthesized using small molecular crosslinker containing acidophilic quaternary ammonium groups through a one-step crosslinking strategy. After doping with phosphoric acid, the quaternary ammonium-biphosphate ion-pair coordination and the crosslinked structure result in the improved anhydrous proton conductivity, oxidation stability, and mechanical strength of the formed membranes compared to un-crosslinked sample. Membrane with the optimized degree of crosslinking exhibits an anhydrous conductivity of 72.27 mScm-1 at 160 oC with a tensile strength of 12.14 MPa. Benefiting from the crosslinked structure and the high proton conductivity, the accordingly formed membrane electrode assembly possesses a high open circuit voltage of 1.01 V and an improved Ohmic polarization, delivering a peak power density of 0.66 Wcm-2 using hydrogen as fuel and air as oxidant. © 2023, The Authors. All rights reserved.

关键词： Proton conductivity

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Scaling effect of intermetallic compounds in Al-Cu composites

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Materials Today Communications 2025年 47卷

作者： Peibo Li Guoqiang Luo Guinan Zhao Yi Sun Qiang Shen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Hubei Longzhong Laboratory Xiangyang Hubei 441000 China

The scale effect of intermetallic compounds (IMCs) plays a pivotal role in governing the mechanical behavior of Al-Cu composites. To investigate this, a series of composites incorporating intermetallic compounds (IMCs) of varying dimensions was fabricated. Experimental results reveal that the mismatch in thermal expansion coefficients between the IMCs and the Al matrix induces interfacial strain gradients. At the nanoscale, these gradients facilitate the nucleation of fault networks that effectively impede dislocation motion by reducing the mean free path, thereby surpassing the limitations predicted by the conventional Hall–Petch relationship. Moreover, nanoscale IMCs serve as dislocation pinning sites, thereby activating the Orowan strengthening mechanism. In contrast, micron-scale IMCs demonstrate limited ability to form dislocation loops, and the stacking faults (SFs) generated during stress relaxation become sources of mobile dislocations. The acceleration of dislocation at phase boundaries leads to stress concentration and premature failure. These insights provide valuable guidance for the structural and compositional design of metal matrix composites.

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