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Enhancing energy density of poly(vinylidene fluoride) composite film via addition of N-doped carbon modified boron nitride and sandwich-structural engineering

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Applied Surface Science 2023年第1期640卷

作者： Huang, Huabo Mei, Wentao Wang, Yucong Huang, Juan Li, Liang Ji, Jiayou Xiong, Chuanxi Hubei Key Laboratory of Plasma Chemistry and Advanced Materials Key Laboratory for Green Chemical Process of Ministry of Education School of Materials Science and Engineering Wuhan Institute of Technology Wuhan430205 China Key Laboratory of Green Processing and Functional New Textile Materials of Ministry of Education School of Textile Science and Engineering Wuhan Textile University Wuhan430200 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China

It is a challenge to simultaneously enhance dielectric constant and breakdown strength of dielectrics and achieve a greatly elevated energy density. Herein, polyaniline was first coated onto the surface of boron nitride nanosheets (BN), and then nitrogen-doped carbon (NC) was formed through a carburization process, resulting in BN@NC composite, which was subsequently added to poly(vinylidene fluoride) (PVDF) to prepare a composite film with high dielectric performance. The characterization showed that BN@NC effectively preserved the nanosheet structure of BN and formed strong hydrogen bonding interactions with the PVDF matrix, promoting the β-PVDF formation. This not only improved the compatibility but also enhanced the interfacial polarization between conductive NC and the polymer, leading to a high dielectric constant. Moreover, the electrically insulating BN prevented the formation of leakage current, resulting in a high breakdown strength. Finally, a sandwich-structured film was constructed, and exhibited a dielectric constant of 10.2 (at 1 kHz), a breakdown strength of 380 MV m−1, and an energy density of 6.1 J cm−3, which were 20%, 36%, and 74% higher, respectively, than those of pure PVDF film (8.5, 280 MV m−1, and 3.5 J cm−3). This work highlights significant potential for applications in low-cost and high-energy density dielectric composites. © 2023 Elsevier B.V.

关键词： Boron nitride

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Recent advances for liquid metals:Synthesis,modification and bio-applications

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Journal of materials Science & technology 2023年第12期143卷 153-168页

作者： Zhenhu Guo Xiaohan Gao Jingsong Lu Wanling Xu Jielin Ye Ying Li Wensheng Xie Lingyun Zhao Key Laboratory of Advanced Materials Ministry of Education of ChinaSchool of Materials Science and EngineeringTsinghua UniversityBeijing 100084China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China School of Medicine Tsinghua UniversityBeijing 100084China Department of Neurosurgery Yuquan HospitalSchool of Clinical MedicineTsinghua UniversityBeijing 100084China The Key Laboratory of Bioorganic Phosphorus Chemistry&Chemical Biology(Ministry of Education) Department of ChemistryTsinghua UniversityBeijing 100084China

Considering the application requirements for modern biomedicine,research into novel biomaterials with unusual functions is highly *** an alternative,liquid metals(LMs),a nontraditional family of metal materials,have piqued the interest of biomedical researchers and made significant advances in biomed-ical areas,owing to their shape transformability,self-healing capability,excellent electrical,and thermal *** particular,many functionalized strategies for the preparation and modification of LMs or LMs-based composites to achieve extended biomedical applications have been investigated in recent *** findings provided inspiring while constructive reference for the fabrication and engineering of novel LMs-based ***,in this topic review,we elaborate on the recent advances of LMs-based functional materials,with particular focuses on the synthesis,modification,and bio-applications,especially in antitumor therapy,antibacterial,contrast agent for imaging,bone repair,electronic skin sen-sor,and nerve connection *** on,the current challenges and future prospects of LMs-based composites are carefully discussed.

关键词： Liquid metals Synthesis Composites Antitumor therapy Bio-application

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Structural regulation of single-atomic site catalysts for enhanced electrocatalytic CO_(2)reduction

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Nano Research 2022年第6期15卷 4925-4941页

作者： Minmin Wang Min Li Yunqi Liu Chao Zhang Yuan Pan State Key Laboratory of Heavy Oil Processing China University of Petroleum(East China)Qingdao 266580China MOE International Joint Laboratory of Materials Microstructure Institute for New Energy Materials and Low Carbon TechnologiesSchool of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China

Electrocatalytic CO_(2)reduction reaction(CO_(2)RR)is considered an efficient way to convert CO_(2)into high-value-added chemicals,and thus is of significant social and economic *** single-atomic site catalysts(SASCs)generally have excellent selectivity because of their 100%atomic utilization and uniform structure of active sites,and thus promise a broad range of ***,SASCs still face challenges such as low intrinsic activity and low density of active *** regulation of the microstructures of SASCs is an effective method to improve their CO_(2)RR performance and to obtain deep reduction *** this article,we systematically summarize the current research status of SASCs developed for highly efficient catalysis of CO_(2)RR,discuss the various structural regulation methods for enhanced activity and selectivity of SASCs for CO_(2)RR,and review the application of in-situ characterization technologies in the SASC-catalyzed CO_(2)*** then discuss the problems yet to be solved in this area,and propose the future directions of the research on the design and application of SASCs for CO_(2)RR.

关键词： Electrocatalysis single-atomic site catalyst structure regulation active site carbon dioxide reduction reaction

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Ternary layered boride MoAlB:A novel thermo-regulation microwave absorbing ceramic material

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Journal of advanced Ceramics 2024年第5期13卷 699-710页

作者： Zhangjue Wang Fan Zhang Nannan Wang Wei Li Yongqiang Chen Hailong Wang Rui Zhang Yanqiu Zhu Bingbing Fan School of Material Science and Engineering Zhengzhou UniversityZhengzhou 450001China Henan Academy of Sciences Zhengzhou 450046China State Key Laboratory of Featured Metal Materials and Life Cycle Safety for Composite Structures MOE Key Laboratory of New Processing Technology for Nonferrous Metals MaterialsSchool of ResourcesEnvironment and MaterialsGuangxi UniversityNanning 530004China Department of Materials and Earth Sciences Technical University of DarmstadtDarmstadt 64287Germany School of Material Science and Engineering Luoyang Institute of Science and TechnologyLuoyang 471023China Department of Engineering Faculty of EnvironmentScience and EconomyUniversity of ExeterExeter EX44QFUK

In the context of the fifth-generation(5G)smart era,the demand for electromagnetic wave(EMW)-absorbing materials has become increasingly prominent,so it is necessary to explore promising candidate *** work focuses on the exploration of the material absorbing properties of a MoAlB MAB(MAB represents a promising group of alternatives,where M stands for a transition metal,A typically denotes Al,and B is boron)phase ***,the first-principles calculations were performed to reveal the unique crystal and layered structure of the MoAlB ceramics and to predict their potential for use as an EMW absorption ***,a series of MoAlB ceramics were synthesized at temperatures ranging from 800 to 1300℃,and the influence of temperature on the phase compositions and microstructures of the obtained MoAlB ceramics was characterized and ***,the practical EMW absorption performance of the prepared MoAlB ceramics was evaluated via a combination of experiments and radar cross-sectional *** MoAlB sample synthesized at 900℃ exhibits superior EMW absorption performance,achieving an impressive minimum reflection loss(RL)of−50.33 *** unique layered structure and good electrical conductivity of the MoAlB samples are the main reasons for their enhanced wave absorption performance,which provides interfacial polarization and multiple dielectric loss ***,this study not only contributes to the understanding of the preparation of MoAlB materials but also provides potential guidance for their utilization in the realm of electromagnetic wave absorption.

关键词： MoAlB electronic band structure electromagnetic wave(EMW)absorption layered ternary boride density of states

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Control over the aggregated structure of donor–acceptor conjugated polymerfilms for high-mobility organicfield-effect transistors

Aggregate

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Aggregate 2024年第3期5卷 26-49页

作者： Xinxiu Cao Yanchun Han Hunan Provincial Key Laboratory of Advanced Materials for New Energy Storage and Conversion School of Materials Science and EngineeringHunan University of Science and TechnologyXiangtanP.R.China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchunP.R.China University of Science and Technology of China HefeiP.R.China

Donor–acceptor(D-A)conjugated polymers have demonstrated great potential in organicfield-effect transistors application,and their aggregated structure is a crucial factor for high charge ***,the aggregated structure of D-A conjugated polymerfilms is complex and the structure–property relationship is difficult to *** review provides an overview of recent progress in controlling the aggregated structure of D-A conjugated polymerfilms for higher mobility,including the mechanisms,methods,and *** discuss the multilevel microstructures of D-A conjugated polymerfilms,and then summarize the current understanding of the relationship betweenfilm microstructures and charge transport ***,we review the theory of D-A conjugated polymer *** that,we summarize the common methods to control the aggregated structure of semi-crystalline and near-amorphous D-A conjugated polymerfilms,such as crystallites and aggregates,tie chains,film alignment,and attempt to understand them from the basic theory of polymer ***,we provide the current challenges in controlling the aggregated structure of D-A conjugated polymerfilms and in understanding the structure–property relationship.

关键词： aggregated structure charge mobility crystallization D-A conjugated polymers near-amorphous organicfield-effect transistors

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Hierarchical Structured Fabrics with Enhanced Pressure Sensing Performance Based on Orientated Growth of Functional Bacterial Cellulose

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advanced Fiber materials 2024年第5期6卷 1554-1568页

作者： Chong Gao Yingcun Liu Zongxue Gu Juan Li Yue Sun Wei Li Keshuai Liu Duo Xu Bin Yu Weilin Xu College of Textile Science and Engineering Zhejiang Sci-Tech UniversityHangzhou 310018People’s Republic of China State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile UniversityWuhan 430200People’s Republic of China College of Textile and Clothing Engineering Soochow UniversitySuzhou 215123People’s Republic of China

Wearable electronics based on natural biomaterials,such as bacterial cellulose(BC),have shown promise for a variety of healthcare and human-computer interaction ***,current BC-based pressure sensors have an inherent limi-tation,which is the two-dimensional rigid structures and limited compressibility of BC restrict the sensitivity and working range for pressure ***,we propose a strategy for fabricating BC/polypyrrole/spacer fabric(BPSF)pressure sensors with a hierarchical structure constructed by integrating conductive BC nanonetwork into a compressible fabric frame via the in situ biofermentation *** hierarchical structure design includes a cross-scale network from the nanoscale BC sensor networks to the macroscopic three-dimensional compressible fabric sensor network,which significantly improves the working range(0-300 kPa)and sensitivity(40.62 kPa-1)of *** this unique structural design,the sensor also achieves a high fatigue life(~5000 cycles),wearability,and reproducibility even after several washing and abrasion ***,a flexible and wearable electronic textile featuring an n×n sensing matrix was developed by constructing BPSF arrays,allowing for the precise control of machines and weight distribution *** empirical insights are valuable for the biofabrication and textile structure design of wearable devices toward the realization of highly intuitive human-machine interfaces.

关键词： Bacterial cellulose textile In situ biofermentation Hierarchical structure Pressure sensing

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Growth behavior and electronic regulation of Pt on various Mo-based supports for hydrogen evolution electrocatalysis

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Science China Chemistry 2025年第5期68卷 1837-1846页

作者： Lulu Chen Yichao Huang Jiajun Wang Meihong Liao Zhiyuan Liu Meiqi Liu Hanqing Cai Lin Wang Lidong Gao Dawei Hu Lianming Zhao Ning Pu Zhuangjun Fan State Key Laboratory of Chemical Safety School of Materials Science and EngineeringChina University of Petroleum (East China) School of Mechanical and Electronic Engineering Qingdao Binhai University Qingdao Chuangqi New Energy Catalysis Technology Co.Ltd. Sinopec Research Institute of Petroleum Processing Co.Ltd. Institute of Energy Hefei Comprehensive National Science Center

Insight into the growth behavior and electronic regulation of platinum（Pt） on various transition metal supports is paramount in developing high-performing electrocatalysts for hydrogen evolution reactions（HER）.Herein,we studied the influence of molybdenum-based supports（MoX,X=C,N,P,and S） on the growth behavior and electronic regulation of *** found that the formation energy variations between Pt single atom and clusters on MoX supports play a pivotal role in the growth behavior of ***,the electronic regulation of Pt induced by metal-support interaction may reflect the valence changes of Pt in PtMoX/*** Pt-MoC/C catalyst with a moderate valence state of Pt exhibits the best HER activity with an overpotential of 12.0 mV at 10 mA cm-2and a mass activity of 27.1 A mgPt-1,12.3 times as high as that of commercial 20 wt%Pt/*** work provides constructive guidance for the design of high-performance HER catalysts.

关键词： electronic structures single atom clusters electrocatalysis hydrogen evolution reaction

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Boosting Ion Conduction and Moisture Stability Through Zn2+ Substitution of Chloride Electrolytes for All-Solid-state Lithium Batteries

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advanced Energy materials 2025年第0期

作者： Lei, Peng Wu, Gang Liu, Hong Qi, Xiang Wu, Meng Li, Dabing Li, Yang Gao, Lei Nan, Ce-Wen Fan, Li-Zhen Beijing Key Laboratory for Advanced Energy Materials and Technologies Institute of Advanced Materials and Technology University of Science and Technology Beijing Beijing100083 China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing100084 China

The recently emerged chloride solid electrolytes have garnered significant attention due to their superior ionic conductivity, wide electrochemical stability window, and exceptional compatibility with high-voltage oxide cathodes. Nevertheless, the currently cost-effective Zr-based chloride solid electrolytes face significant challenges, including low ionic conductivity and poor moisture stability. Herein, a versatile Zn2+-doped Zr-based chloride electrolyte is presented, designed to meet the aforementioned requirements. The optimized Li2.4Zr0.8Zn0.2Cl6 exhibits an improved ionic conductivity of 1.13 mS cm−1 at 30 °C. Simultaneously, the Li2.4Zr0.8Zn0.2Cl6 also demonstrates impressive moisture stability, maintaining its structural integrity after exposure to humid air. The mechanism underlying the enhanced moisture stability of Li2.4Zr0.8Zn0.2Cl6 is further elucidated by density functional theory calculations. Most notably, whether coupled with LiCoO2 or LiNi0.8Mn0.1Co0.1O2 cathodes, Li2.4Zr0.8Zn0.2Cl6-based all-solid-state batteries demonstrate exceptional cycling stability and rate performance. This high ionic conduction and moisture-resistant chloride electrolyte holds great promise for significantly advancing the commercialization of all-solid-state lithium batteries. © 2025 Wiley-VCH GmbH.

关键词： Solid-state Batteries

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Fabrication and Characterization of Pressure Sensors Based on Xanthan Gum and Pullulan

Fabrication and Characterization of Pressure Sensors Based o...

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作者： Ya-Qi Zhang Shi-Yao Liu Yong-Zhen Tao State Key Laboratory for Textile Materials and Advanced Processing Technology Wuhan Textile University College of Material Science and Engineering Wuhan Textile University

Conductive hydrogels based on biopolymers have potential applications in the field of wearable devices,implantable devices, and human-machine interfaces due to their biocompatibility as well as ***, hydrogels are prone to water loss under dry atmospheres. In this paper, a biopolymer-based pressure sensor with water retention was designed. Xanthan gum(XG) and pullulan(P) were cross-linked with sodium trimetaphosphate(STMP) to prepare XG5-P-STMP, and polyethylene glycol with a molecular weight of 200(PEG200) was added into hydrogels to improve moisture retention. The mechanical properties of the hydrogels were investigated by rheologic measurements such as time sweep, frequency sweep, and strain sweep. The results showed that the addition of PEG200 enhanced strength and moisture retention of the hydrogels, and high PEG200 content hindered the recovery property of the hydrogels. Furthermore, the XG5-P-PEG-STMP hydrogel with ionic conductivity and recoverability was explored as a pressure sensor, and the resistance change ratio exhibited repeatable profile. This work provides some valuable information for further applications of natural polysaccharides as intelligent flexible elections.

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Reactive destabilization and bidirectional catalyzation for reversible hydrogen storage of LiBH_(4) by novel waxberry-like nano-additive assembled from ultrafine Fe_(3)O_(4) particles

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Journal of materials Science & technology 2024年第6期173卷 63-71页

作者： S.Wang M.H.Wu Y.Y.Zhu Z.L.Li Y.X.Yang Y.Z.Li H.F.Liu M.X.Gao Department of Material Science Shenzhen MSU-BIT UniversityShenzhen 518172China State Key Laboratory of Silicon and Advanced Semiconductor Materials&School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027China Institute of Resources Utilization and Rare Earth Development State Key Laboratory of Rare Metals Separation and Comprehensive UtilizationGuangdong Provincial Key Laboratory of Rare Earth Development and ApplicationGuangdong Academy of SciencesGuangzhou 510650China Institute of Science and Technology for New Energy Xi’an Technological UniversityXi’an 710021China National Supercomputing Center in Shenzhen Shenzhen 518055China

LiBH_(4) containing 18.5 wt.%H_(2) is an attractive high-capacity hydrogen storage material,however,it suffers from high operation temperature and poor ***,a novel and low-cost bifunctional additive,waxberry-like Fe_(3)O_(4) secondary nanospheres assembled from ultrafine primary Fe_(3)O_(4) nanoparticles,is synthesized,which exhibits significant destabilization and bidirectional catalyzation towards(de)hydrogenation of LiBH_(4).With an optimized addition of 30 wt.% waxberry-like Fe_(3)O_(4),the system initiated dehydrogenation below 100℃ and released a total of 8.1 wt.%H_(2) to 400℃.After 10 cycles,a capacity retention of 70% was achieved,greatly superior to previously reported oxides-modified *** destabilizing and catalyzing mechanisms of waxberry-like Fe_(3)O_(4) on LiBH_(4) were systematically analyzed by phase and microstructural evolutions during dehydrogenation and hydrogenation cycling as well as density functional theory(DFT)*** present work provides new insights in developing advanced nano-additives with unique structural and multifunctional designs towards LiBH4 hydrogen storage.

关键词： LiBH_(4) Hydrogen storage Waxberry-like Fe_(3)O_(4) Destabilization Catalysis

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