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SSRN 2023年

作者： Wang, Hong Peng, Haoyang Xiao, Zhitong Yu, Ruohan Liua, Fang Zhua, Zhu Zhou, Liang Wu, Jinsong State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China School of Mathematics and Physics Jingchu University of Technology Jingmen448000 China Wuhan University of Technology Wuhan430070 China Shenzhen Institute of Wuhan University of Technology Guangdong Shenzhen518000 China

Manganese rich oxides with layered structure are now being developed as cathodes for potassium ion batteries (PIBs). Nevertheless, poor cycling stability and sluggish electrochemical kinetics have hindered their practical applications. Here, we construct a thin K3PO4/MnPO4 layer, which has high conductivity of both electron and potassium-ion, on the surface of K0.5Mn0.8Co0.2O2 (KMCO) and achieve improved cycling stability and capacity rate when the composite is used as cathodes in PIBs. Comparing to the pure KMCO, the K3PO4/MnPO4-coated K0.5Mn0.8Co0.2O2 (P-KMCO) has higher electron and K-ion conductivity, less surficial oxygen loss and layered-to-spinel-to-rock salt tri-phase transition, and less internal lattice expansion and contraction in cycling, as studied by aberration-corrected scanning transmission electron microscopy and in-situ X-ray diffraction. The synthesized P-KMCO exhibits a highly reversible specific capacity (101.3 mAh g-1 at 0.1 A g-1), excellent rate performance and stellar capacity retention of 80% after 500 cycles at 1 A g-1 compared to pure KMCO (78.6 mAh g-1 at 0.1 A g-1 with 67.3% capacity retention). The P-KMCO electrode shows also a supreme electrochemical performance when assembled in pouch cells. First-principal calculations imply that the surface modification can effectively prevent TM ions dissolution and oxygen release while cycling. Like those developed in lithium-ion batteries, this work demonstrates the appropriate surface engineering is also an effective approach to development stable cathodes of PIBs. © 2023, The Authors. All rights reserved.

关键词： Cathodes

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Tuning Ferroelectrics to Antiferroelectrics in Multiferroic LaxSr1-xFe12O19 Ceramics

arXiv

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arXiv 2021年

作者： Duan, Cong-Cong Tan, Guo-Long State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

The combination of antiferroelectricity (AFE) and ferromagnetism (FM) in one structure would allow the development of new type of multiferroic candidates, which be applicable not only in magnetoelectric memories but also in novel energy storage devices. Here we propose a novel type of multiferroic candidate LaxSr1-xFe12O19, whose room temperature state could betuned from ferroelectrics (FE) to antiferroelectrics by changing x from 0 to 0.5. The emphasis of this paper will be focused on the La0.5Sr0.5Fe12O19 system, in which full AFE and FM coexist. The pure antiferroelectric behavior in La0.5Sr0.5Fe12O19 ceramics is demonstrated by double polarization-electric field (P-E) hysteresis loops, which are fully separated by a linear antiferroelectric AFE component with zero net polarization. The material of La0.2Sr0.7Fe12O19 with the intermediate composition exhibits a hybrid ferroelectric/antiferroelectric state. The recoverable energy density of the antiferroelectric La0.5Sr0.5Fe12O19 phase reaches Ure∼14.3 J/cm3. This material demonstrates strong magnetoelectric coupling and giant magnetoresistance (GMR) effect. A 1.1T magnetic field generates electronic polarization up to 0.95μC/cm2, reduce the resistance by 117%, enhances dielectric constants by 540% and right shifts the maximum dielectric loss peak by 208 kHz. The combined functional responses provide an opportunity to develop novel multifunctional electric and energy storage devices. © 2021, CC BY.

关键词： Energy storage

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Controllab.e preparation and microwave absorption properties of shape anisotropic Fe_(3)O_(4) nanobelts

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Journal of Materiomics 2021年第5期7卷 957-966页

作者： Jialiang Pan Rujing Zhang Jun Ling Min Wang Zechen Li Zhen Zhen Limin He Hongwei Zhu State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing100084China The First Scientific Research Institute of Wuxi Wuxi214035JiangsuChina Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material AECC Beijing Institute of Aeronautical MaterialsBeijing100095China

To substantially prevent electromagnetic threatens,microwave absorbing materials(MAMs)are required to eliminate surplus electromagnetic *** a typical MAM,Fe_(3)O_(4) particles with complex permittivity and permeability have been widely applied due to the coexistence of magnetic loss and dielectric ***,the necessary high mass fraction significantly limited its applications,thus Fe_(3)O_(4) nanostructures have been extensively investigated to overcome this *** this work,uniform Fe_(3)O_(4) nanobelts were prepared by electrospinning and two-step thermal *** controlling the composition and viscosity of the electrospinning precursor solution,Fe_(3)O_(4) nanobelts with tunable lateral sizes(200 nme1 mm)were *** samples with low content(only 16.7 wt%)Fe_(3)O_(4) exhibited wide maximum effective absorbing bandwidths(EAB)over 3 GHz,and Fe_(3)O_(4) nanobelts with smaller lateral sizes showed a maximum EAB of 4.93 ***,Fe_(3)O_(4) nanobelts with smaller lateral sizes presented superior reflection loss properties,the lowest reflection loss reached-53.93 dB at 10.10 GHz,while the maximum EAB was up to 2.98 *** excellent microwave reflection loss of Fe_(3)O_(4) nanobelts was contributed to the enhanced synergistic effect of magnetic loss,dielectric loss,and impedance matching,originated from the hierarchically cross-linked networks and shape *** study could broaden the practical applications of magnetic absorbers,and provided an approach for the development of shape anisotropic magnetic materials.

关键词： Fe_(3)O_(4) Nanobelts Shape anisotropy Microwave absorption Reflection loss

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Interfacial Microstructure and Mechanical Behavior of Low-Temperature Diffusion Bonded Mo/SS304 Joints Using Ni xCu 1-x Interlayers

SSRN

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SSRN 2021年

作者： Jia, Mingyong Chen, Fei Zhang, Lei Huang, Zhifeng Shen, Qiang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

To join dissimilar metals with large differences in characteristics, such as molybdenum (Mo) and stainless steels (SS), is essential to take full advantage of their combined performances. In this work, Mo and SS304 have been jointed with Ni interlayer by using a diffusion bonding technique at different bonding temperatures. The results show that a MoNi brittle intermetallic compound is easy to form in the interface of the Mo/SS304 joint with increasing the bonding temperature, which will reduce the shear strength of the joint because a crack is easy to form between Mo and the intermetallic compounds. Meanwhile, Mo/SS304 joints have also been prepared by using NixCu1-x (x=0.45, 0.24, or 0) as an interlayer. The result shows that reducing Ni content can avoid the formation of intermetallic compounds, and the fracture occurs between the interlayer and Mo diffusion zone far away from the Mo side. This work shows that the fracture properties of the Mo/SS304 joint can be modified by changing the composition of the interlayer. The best shear strength of the Mo/SS304 joint is 140 MPa. This work is important for providing an effective approach to join Mo and SS304 using a low-temperature diffusion bonding method. © 2021, The Authors. All rights reserved.

关键词： Intermetallics

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High ammonia sensitive ability of novel Cu12Sb4S13 quantum dots@reduced graphene oxide nanosheet composites at room temperature

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Chinese Chemical Letters 2020年第8期31卷 2109-2114页

作者： Yueli Liu Binghua Sang Haoran Wang Zijing Wu Yuxuan Wang Ziwei Wang Zhuoyin Peng Wen Chen State Key Laboratory of Silicate Materials for Architectures School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China The Key Laboratory of Efficient&Clean Energy Utilization School of Energy and Power EngineeringChangsha University of Science and TechnologyChangsha 410111China

In the work,rGO nanosheet is synthesized using the typical Hummer’s method,then Cu12Sb4 S13 quantum dots@rGO composites are prepared by solvent thermal method,and Cu12Sb4 S13 quantum dots with the average size of 5 nm are densely distributed on the surface of rGO ***3 gas response of Cu12Sb4 S13quantum dots@rGO nanosheet composites at room te mperature of 25℃is enhanced compared with the pure Cu12Sb4 S13 quantum dots and rGO nanosheet,and the composites possess an excellent stability during the humidity range of 45%-80%with a low detection limit of 1 ppm,which is related with the intrinsic hydrophobicity characteristic of Cu12Sb4 S13 quantum *** also proves that Cu12Sb4 S13quantum dots@rGO nanosheet composites have a quite high selectivity towards ammonia compared with ethanol,methanol,acetone,toluene,hydrogen sulfide and nitrogen dioxide at room *** gas sensing mechanism of the composites is discussed primarily.

关键词： Cu12Sb4S13 quantum dots@rGO nanosheet Composites NH3 Room temperature Gas response

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Printed aerogels: Chemistry, processing, and applications

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Chemical Society Reviews 2021年第6期50卷 3842-3888页

作者： Feng, Junzong Su, Bao-Lian Xia, Hesheng Zhao, Shanyu Gao, Chao Wang, Lukai Ogbeide, Osarenkhoe Feng, Jian Hasan, Tawfique Cambridge Graphene Centre University of Cambridge CambridgeCB3 0FA United Kingdom Science and Technology on Advanced Ceramic Fibers and Composites Laboratory National University of Defense Technology Changsha Hunan410073 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Loushi Road 122 Wuhan430070 China Laboratory of Inorganic Materials Chemistry Department of Chemistry University of Namur 61 rue de Bruxelles NamurB-5000 Belgium State Key Laboratory of Polymer Materials Engineering Polymer Research Institute Sichuan University Chengdu610065 China Laboratory for Building Energy Materials and Components Swiss Federal Laboratories for Materials Science and Technology EmpaCH-8600 Cyprus MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University 38 Zheda Road Hangzhou310027 China

As an extraordinarily lightweight and porous functional nanomaterial family, aerogels have attracted considerable interest in academia and industry in recent decades. Despite the application scopes, the modest mechanical durability of aerogels makes their processing and operation challenging, in particular, for situations demanding intricate physical structures. "Bottom-up"additive manufacturing technology has the potential to address this drawback. Indeed, since the first report of 3D printed aerogels in 2015, a new interdisciplinary research area combining aerogel and printing technology has emerged to push the boundaries of structure and performance, further broadening their application scope. This review summarizes the state-of-the-art of printed aerogels and presents a comprehensive view of their developments in the past 5 years, and highlights the key near- and mid-term challenges. This journal is © The Royal Society of Chemistry.

关键词： Aerogels

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Experimental Probing of the Effect of Nafion Poisoning at Different Pt Loadings in a Pemfc

SSRN

引用

SSRN 2022年

作者： Zhou, Fen Zhang, Hui Guan, Shumeng Li, Guangfu Xia, Lei Pan, Mu Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen Valley Foshan528200 China State Key Laboratory of Advanced Technology for Materials Synthesis Processing Wuhan University of Technology Wuhan430070 China

The charge-transfer resistance ( R ct ) in electrochemical impedance spectroscopy (EIS) was applied as an activity indicator to study the suppression of a rotating disk electrode (RDE) and membrane electrode assembly (MEA) by Nafion with different Pt loadings. Use of the R ct avoids uncertainty in activity characterization;such uncertainty is caused by mass transfer in highly loaded catalyst agglomerates. It was found that Nafion had a stronger poisoning effect at lower Pt loadings. The simultaneous reduction in the working voltage further aggravates the poisoning, especially under low-Pt conditions. After poisoning, the normalized R ct at 20 µg/cm 2 increased from 8 times at 0.9 V to 21 times at 0.82 V. When the Nafion adsorption coverage on the surface of Pt remained constant, the suppressed activity increased as the Pt loading decreased. Therefore, it is critical to consider Nafion poisoning when constructing MEAs with low platinum and take appropriate strategies to alleviate poisoning and achieve high-performance output. © 2022, The Authors. All rights reserved.

关键词： Proton exchange membrane fuel cells (PEMFC)

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3D-bioprinted vascular scaffold with tunable mechanical properties for simulating and promoting neo-vascularization

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Smart materials in Medicine 2022年 3卷 199-208页

作者： Zhou, Xin Gao, Qiang Yu, Dan Shao, Yichun Wang, Zhaohui Liu, Xiao Wang, Wenwu Chang, Likun Ma, Tianxiang Mok, Hsiaopei Cen, Jianzheng Chen, Jimei Tahchi, Mario El Zhuang, Jian Mou, Fangzhi Zhang, Jin Yin, Yixia State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Department of Cardiac Surgery Guangdong Cardiovascular Institute Guangdong Provincial People's Hospital Guangdong Academy of Medical Sciences Guangzhou510100 China Key Laboratory for Biomechanics and Mechanobiology of the Ministry of Education Beijing Advanced Innovation Centre for Biomedical Engineering School of Biological Science and Medical Engineering Beihang University Beijing100083 China LBMI Department of Physics Faculty of Sciences 2 Lebanese University P.O. Box 90656 Jdeidet Lebanon Qingyuan Innovation Laboratory College of Chemical Engineering Fuzhou University 2 Xueyuan Road Fuzhou350108 China

Alternative artificial vessels with tissue-matching mechanical and biological performance have been continuously taking great attention in bioengineering. However, it is challenging to take into account both mechanical and biological properties in formulating a hydrogel material. In the current study, a composite hydrogel ink based on geltain-methacryloyl (GelMA) and sodium alginate (SA) was prepared by a two-step polymerization process, and its fast shaping was realized by stabilizing the alginate fraction in calcium ion bath as well as the photo-crosslinking of GelMA. Mechanical properties of the transparent 3D printing GelMA/Gelatin/SA blood vessels were determined by testing their stretching and resilience performance. Based on Von Mise stress simulation using Ansys, strain of the artificial blood vessels reached 147% and the elastic Young's modulus reached approximately 224 kPa in the optimal hydrogel formulation, matching well with capability of enduring certain blood pressure encountered in real tissue. A selective and uniform permeability of hydrogel tubes was presented by using small molecules and human red blood cells, meanwhile excellent hemolysis, cell viability, and proliferation ability were also verified. Based on the results of in vitro assessment and the in vivo transplantation in SD rats, our proposed GelMA/Gelatin/SA vessels, with tissue-matching mechanical properties and their ideal biodegradation behavior, promoted neo-vascularization capacity and showed promising potential in producing an artificial blood vessel. © 2022 The Authors

关键词： Blood

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Hard Carbon with Embedded Graphitic Nanofibers for Fast-Charge Sodium-Ion Batteries

SSRN

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SSRN 2024年

作者： Wang, Ke Li, Mengjun Zhu, Zhu Ai, Wei Wu, Han Wang, Bingwu He, Pan Xie, Dong Wu, Jinsong Huang, Wei Frontiers Science Center for Flexible Electronics Shaanxi Institute of Flexible Electronics Northwestern Polytechnical University Xi’an710072 China Nanostructure Research Center State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Hubei Wuhan430070 China Nanjing University of Posts and Telecommunications China

关键词： Diffusion

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Hierarchical ZrO2@N-doped carbon nano-networks anchored ultrafine Pd nanoparticles for highly efficient catalytic hydrogenation

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Science China Chemistry 2022年第8期65卷 1661-1669页

作者： Pu, Chun Li, Rui-Dong Chang, Gang-Gang Chen, Min-Jie Yao, Yao Li, Jun-Sheng Zhao, Bo Wu, Lu Zhang, Yue-Xing Yang, Xiao-Yu School of Chemistry Chemical Engineering and Life Science & State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China School of Power Engineering Naval University of Engineering Wuhan China Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials Key Laboratory for the Synthesis and Application of Organic Functional Molecules of Ministry of Education College of Chemistry and Chemical Engineering Hubei University Wuhan China

Carbon supported metal catalysts have received considerable interest due to their widespread applications in heterogeneous catalysis. However, the controllab.e synthesis of carbon support with defined morphology and composition still represents great challenging. Herein, we reported the synthesis of a well-defined hierarchically nanosized H-ZrO2/NC (nitrogen-doped carbon) network via an inheritable carbonization strategy. When immobilizing the palladium clusters into the support, the N-doped sites and oxygen vacancy of the carbon composite can effectively stabilize and activate Pd through strong metal-support interaction which was also confirmed by density functional theory (DFT) calculations. Moreover, the hierarchically nanosized network can contribute to the exposure of active sites and facilitate the mass transfer during the catalytic process. As a result, benefiting from the hierarchical structure, composition and hydrolytic nature, Pd@H-ZrO2/NC exhibited excellent catalytic activity and stability towards the hydrogenation of furfural in mild reaction conditions, as well as good universality toward the hydrogenation of a series of unsaturated hydrocarbons.

关键词： hierarchical carbon nanosized networks composites metal-support interaction catalytic hydrogenation

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