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Ablation behavior and mechanism of MoSi2/mica/HSM modified CF/BPR composites during prolonged ablation of oxyacetylene flame

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Ceramics International 2025年

作者： Zhang, Shiquan Zhang, Jian Hu, Sheng Zhang, Ruizhi Li, Junguo Shen, Qiang State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Hubei Xiangyang441000 China School of Chemical and Environment Engineering Hubei Minzu University Enshi445000 China

Ablative thermal protection materials are widely used in entry and re-entry vehicles which benefit from their strong adaptability. However, long-term ablation has been a limitation due to the consumption of the matrix of the ablative materials. In this work, the microstructure evolution and ablation properties of the MoSi2/mica-modified CF/BPR composites with and without hollow silicate glass microspheres (HSMs) under protracted ablation have been investigated. The mass ablation rates decreased while the linear ablation rates increased when the ablation times were prolonged. The composites with 30 vol.% HSMs have good insulation properties, shown by a lower backside temperature of 240.9 °C after 100 s of ablation. The decrease in thermal conductivity limited heat transfer in both the axial and horizontal directions. This led to heat concentration and severe ablation at the central surface. The three-dimensional porous and the ladder structure formed in the transfer region, and the features gradually disappeared while extending the ablation times because of the flame erosion and formed liquid phases. The heat diffusion and concentration within the matrix established a gradient temperature field, which determined the ablation behavior and mechanism, providing valuable insights for the development of advanced ablative thermal protection materials. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Silicates

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In-situ surface self-reconstruction in ternary transition metal dichalcogenide nanorod arrays enables efficient electrocatalytic oxygen evolution

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Journal of Energy Chemistry 2021年第4期30卷 10-16页

作者： Qiang Chen Yulu Fu Jialun Jin Wenjie Zang Xiong Liu Xiangyong Zhang Wenzhong Huang Zongkui Kou John Wang Liang Zhou Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina Department of Materials Science and Engineering National University of SingaporeSingapore 117574Singapore Foshan Xianhu Laboratory Foshan 528216GuangdongChina

Water splitting has received more and more attention because of its huge potential to generate clean and renewable *** highly active and durable oxygen evolution reaction(OER)catalysts play a decisive factor in achieving efficient water *** identification of authentic active origin under the service conditions can prompt a more reasonable design of catalysts together with well-confined micro-/nano-structures to boost the efficiency of water ***,Fe,Co,and Ni ternary transition metal dichalcogenide(FCND)nanorod arrays on Ni foam are purposely designed as an active and stable low-cost OER pre-catalyst for the electrolysis of water in alkaline *** optimized FCND catalyst demonstrated a lower overpotential than the binary and unary counterparts,and a 27-fold rise in kinetic current density at the overpotential of 300 m V compared to the nickel dichalcogenide *** spectra and other structural characterizations at different potentials reveal that the in-situ surface self-reconstruction from FCND to ternary transition metal oxyhydroxides(FCNOH)on catalyst surfaces initiated at about 1.5 V,which is identified as the origin of OER *** surface selfreconstruction towards FCNOH also enables excellent stability,without fading upon the test for 50 h.

关键词： Surface self-reconstruction Transition metal dichalcogenide Transition metal oxyhydroxide Oxygen evolution reaction Water splitting

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High-entropy alloy nanoparticles as a promising electrocatalyst to enhance activity and durability for oxygen reduction

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Nano Research 2022年第9期15卷 7868-7876页

作者： Yanan Yu Fanjie Xia Chengjie Wang Jinsong Wu Xianbiao Fu Dongsheng Ma Bencai Lin Jiaao Wang Qin Yue Yijin Kang Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Nanostructure Research CenterWuhan University of TechnologyWuhan 430070China Jiangsu Province Cultivation base for State Key Laboratory of Photovoltaic Science and Technology Changzhou UniversityChangzhou 213164China Department of Chemistry and the Oden Institute for Computational Engineering and Sciences The University of Texas at AustinTX 78712USA

Developing efficient platinum-based electrocatalysts with super durability for the oxygen reduction reaction(ORR)is highly desirable to promote the large-scale commercialization of fuel *** progress has been made in this aspect,the electrochemical kinetics and stability of platinum-based catalysts are still far from the requirements of the practical ***,PtPdFeCoNi high-entropy alloy(HEA)nanoparticles were demonstrated via a high-temperature injection *** HEA nanocatalyst exhibits outstanding catalytic activity and stability towards ORR due to the high entropy,lattice distortion,and sluggish diffusion effects of HEA,and the HEA nanoparticles delivered a mass activity of 1.23 A/mgPt and a specific activity of 1.80 mA/cmPt 2,which enhanced by 6.2 and 4.9 times,respectively,compared with the values of the commercial Pt/C *** importantly,the high durability of PtPdFeCoNi HEA/C was evidenced by only 6 mV negativeshifted half-wave potential after 50,000 cycles of accelerated durability test(ADT).

关键词： high-entropy alloy oxygen reduction reaction electrocatalyst high durability

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Novel smart coaxial electrospinning textiles for efficient thermal interface management and electromagnetic compatibility in electronics

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Chemical Engineering Journal 2023年第1期472卷

作者： Song, Shaokun Ai, Hong Lv, Linda Guo, Yi Han, Ting Dong, Lijie Center for Smart Materials and Devices State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China

Phase change materials (PCMs) have attracted considerable attention for their energy storage and thermoregulatory properties. However, the solid–liquid leakage, low thermal conductivity, and single functionality of PCMs hinder their applications to electronic equipment. In this study, polyvinyl alcohol (PVA) and polyethylene oxide/ferric oxide (PEO/Fe3O4)-based core–sheath textiles are prepared using an eco-friendly coaxial electrospinning technique and simple steam crosslinking. The composite phase change fibers (CPCFs) and magnetic composite phase change fibers (MCPCFs) produced in this way show ultrahigh encapsulation ratios of 78.02 wt% and 69.11 wt%, respectively, and high phase change enthalpies of 106.96 J g−1 and 94.75 J g−1, respectively. The addition of Fe3O4 (20 wt%) introduces a saturation magnetization of 9.5 emu g−1, thereby realizing 3 dB electromagnetic shielding performance. The textiles exhibit excellent flexibility and can be formed into complex shapes. Owing to their core–sheath structure, the CPCFs and MCPCFs exhibit outstanding structural and thermal stabilities during 100 thermal cycles. Furthermore, the mechanical properties of the CPCF and MCPCF textiles can be enhanced by crosslinking. © 2023 Elsevier B.V.

关键词： Phase change materials

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Boosting fast interfacial Li^(+)transport in solid-state Li metal batteries via ultrathin Al buffer layer

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Nano Research 2023年第5期16卷 6825-6832页

作者： Shengnan Zhang Qing Sun Guangmei Hou Jun Cheng Linna Dai Jianwei Li Lijie Ci Key Laboratory for Liquid-Solid Structural Evolution&Processing of Materials(Ministry of Education) Research Center for Carbon NanomaterialsSchool of Materials Science and EngineeringShandong UniversityJinan 250061China School of Light Industry and Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China State Key Lab of Advanced Welding and Joining School of Materials Science and EngineeringHarbin Institute of Technology(Shenzhen)Shenzhen 518055China School of Science Hubei University of TechnologyWuhan 430068China University of Health and Rehabilitation Sciences Qingdao266071China

Na superionic conductor(NASICON)-type Li_(1.5)Al_(0.5)Ge_(0.5)P_(3)O_(12)(LAGP)solid state electrolytes(SSEs)have attracted significant interests thanks to the prominent ionic conductivity(>10^(–4)S·cm^(–1))at room temperature and superb stability in ***,its application has been hindered by the lithium dendrites and the intrinsic interfacial instability of LAGP towards metallic Li,***,by magnetron sputtering(MS),an ultrathin Al film is deposited on the surface of the LAGP pellet(Al-LAGP).By in-situ alloying reaction,the spontaneously formed LiAl buffer layer inhibits the side reaction between LAGP SSEs and Li metal,induces the uniform distribution of interfacial electric field as *** functional theory(DFT)calculations demonstrate that the LiAl alloy surface promotes the diffusion of lithium atoms due to the lower energy barrier,thereby inhibiting the formation of lithium ***,the Li/Al-LAGP-Al/Li symmetric cells show a low resistance of 210Ωand a durable lifespan over 1,200 h at a high current density of 0.1 mA·cm^(-2).Assembled all solid state lithium metal batteries(ASSLMBs)with LiFePO_(4)(LFP)cathode significantly improve cycle stability and rate performance,proving a promising stabilization strategy towards the NASIOCN type electrolyte/anode interface in solid state Li metal batteries.

关键词： Li_(1.5)Al_(0.5)Ge_(0.5)P_(3)O_(12) solid-state battery Li+transport interfacial modification Al buffer

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Scalab.e Multilayered Dielectric Polymer Film Exhibiting Significantly Improved High-Temperature Energy Density

SSRN

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SSRN 2024年

作者： Li, Shuxuan Qu, Jie Wang, Jian Li, Xinhui Dai, Xingyao Jiang, Yanda Shen, Zhonghui Li, Bao-Wen Zhang, Xin State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and Devices International School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China

Dielectric polymers, serving as crucial dielectric media in high-power-density energy storage devices, play a pivotal part in modern industries and electrical systems. However, the rapid degradation of breakdown strength and charge-discharge efficiency in elevated temperature environment imposes formidable limitations on the utilization of polymer dielectric under extreme conditions. Here, a series of polyetherimide/polysulfone alternating multilayer composite films are prepared using a non-equilibrium processing method, which effectively blocks the development of breakdown paths by the interface barriers in the multilayer structure. The deep trap sites within the interface capture the charge carriers excited at high temperatures, thus decreasing conduction loss and enhancing the efficiency and breakdown field strength of the dielectric polymer. Consequently, excellent capacitive performances including a high energy density of 5.4 J cm-3 with an efficiency exceeding 90% at 200 °C and cycle stability up to 106 cycles have been obtained. Furthermore, the multilayer polymer capacitors (MLPC) constructed from composite films also exhibit significant flexibility and thermal stability. This work provides valuable insights for the advancement of high-temperature energy storage polymers with commercial application value. © 2024, The Authors. All rights reserved.

关键词： Energy storage

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引入共价型氮化钒来提高氮掺杂碳的亲电性以促进氧还原反应

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Science China materials 2023年第1期66卷 160-168页

作者：李士栋庄泽超夏力学朱杰鑫刘子昂贺汝涵罗雯黄文忠石长玮赵焱周亮 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Department of Chemistry Tsinghua UniversityBeijing 100084China State Key Laboratory of Silicate Materials for Architectures International School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China The Institute of Technological Sciences Wuhan UniversityWuhan 430072China

氮掺杂碳(NC)是一种有潜力的氧还原反应(ORR)电催化剂.氮掺杂碳可直接作为ORR活性位点中心,优化氮原子的电子结构对催化活性具有很大影响.本文通过简单的物理混合和煅烧处理,构建了一种由氮化钒(VN)纳米颗粒为核、“铠甲状”NC作为壳的... 详细信息

氮掺杂碳(NC)是一种有潜力的氧还原反应(ORR)电催化剂.氮掺杂碳可直接作为ORR活性位点中心,优化氮原子的电子结构对催化活性具有很大影响.本文通过简单的物理混合和煅烧处理,构建了一种由氮化钒(VN)纳米颗粒为核、“铠甲状”NC作为壳的新型VN@NC纳米复合材料.得益于纳米线独特的核@壳结构和优化的电子结构,与纯NC和体相VN相比,所制备的VN@NC展现出更优异的ORR活性(起始电位:0.93 V).VN的引入诱导了电荷从NC上的氮原子转移到VN上的钒原子,增加了NC上氮原子的亲电性,从而优化了对含氧中间体的吸附过程.VN@NC也展现出了良好的循环稳定性(四万秒测试后,电流密度保持率为89%).本研究揭示了调节NC中氮原子电子结构的重要性,并为构建NC基复合型电催化剂提供了有效方法.

关键词：亲电性氧还原反应电催化剂氮化钒物理混合氮掺杂碳壳结构循环稳定性

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Microstructuring Conductive Electrospun Mats for Enhanced Electro‑active Biofilm Growth and High‑Performance Bioelectrocatalysis

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advanced Fiber materials 2023年第5期5卷 1699-1711页

作者： Min Li Hao Lu Jiadong Hu Xuemei Xiang Yanling Zheng Wenhu Gao Wei Sun Wei Wang Zhisong Lu Yan Qiao Institute for Clean Energy and Advanced Materials School of Materials and EnergySouthwest UniversityChongqing 400715People’s Republic of China Sino‑Singapore Joint Laboratory of Materials and Technologies for Proactive Health Monitoring School of Materials and EnergySouthwest UniversityChongqing 400715People’s Republic of China Experimental Center for Virtual Simulation of Sports and Health Southwest UniversityChongqing 400715People’s Republic of China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University TechnologyWuhan 430070People’s Republic of China Hubei Longzhong Lab Xiangyang 441000People’s Republic of China Key Laboratory of Laser Technology and Optoelectronic Functional Materials of Hainan Province College of Chemistry and Chemical EngineeringHainan Normal UniversityHaikou 571158People’s Republic of China Singapore Institute of Manufacturing Technology Singapore 138669Singapore

Electrospun materials have attracted considerable attention in microbial fuel cells(MFC)owing to their porous structures,which facilitate the growth of electro-active biofilms(EABs).However,the impact of fiber diameter-controlled porous architectures on EAB growth and MFC performance has not been extensively ***,a highly conductive polypyrrole-modified electrospun polyacrylonitrile(PAN)mat was prepared as an electrode material for Shewanella putrefaciens CN32-based *** dominant pore size of the corresponding mat increases from 1 to around 20μm as the fiber diameter increases from 720 to 3770 *** variation affects the adhesion and growth behaviors of electrochemically active bacteria on the mat-based *** electrodes with poresranging from 2 to 10μm allow bacterial penetration into the interior,leading to significant biofilm loading and effective ***,the tight lamination of the electrospun fibers restricts bacterial growth in the deep interior *** developed a friction-induced triboelectric expanding approach to rendering the mats with layered structures to overcome this *** inter-layer spaces of the expanded conductive mat can facilitate bacterial loading from both sides of each layer and serve as channels to accelerate the catalysis of organic ***,the expanded conductive mat with appropriate pore sizes delivers superior bioelectrocatalytic performance in MFCs and dye *** on the findings,a mechanism for the porous structure-controlled EAB formation and bioelectrocatalytic performance was *** work may provide helpful guidance and insights for designing microfiber-based electrodes for microbial fuel cells.

关键词： Electrospun mat Porous structure Bioelectrocatalysis Microbial fuel cells Polypyrrole

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Enhanced performance of crystalline argyrodite Ag8SnSe6 based thermoelectric materials via one-step plasma activated sintering

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Journal of Alloys and Compounds 2025年 1031卷

作者： Melzi, Bachir Yang, Dongwang Zhang, Mingqi Jianan, Lyu Cui, Jingjing Gou, Weijie Zhong, Shenlong Yan, Yonggao Tang, Xinfeng Hubei Longzhong Laboratory Wuhan University of Technology Xiangyang Demonstration Zone Xiangyang441000 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

AgSnSe-based materials are currently becoming prominent as thermoelectric materials with advantageous characteristics at room and medium temperatures. These materials are generally obtained through standard techniques such as melting, annealing, and sintering, which require substantial amounts of energy and time. In this study, we produced Ag8SnSe6 bulks by using a non-equilibrium technique called one-step plasma-activated sintering, using raw elemental powders as starting materials. We achieved the formation of the orthorhombic Ag8SnSe6 phase in polycrystalline form at 873 K, which allowed us to investigate the influence of sintering temperature on the microstructural characteristics. Higher sintering temperatures resulted in an increase in phase purity and a decrease in the presence of secondary phase. In addition, we conducted a study on Ag8-x Sn1+xSe6 (x = 0, 0.1, 0.2, 0.3, 0.4, 0.5) to investigate the influence of the fraction of Ag/Sn on the phase and thermoelectric properties. The samples exhibited excellent purity with minimal presence of Ag2Se precipitates, and the maximum thermoelectric figure of merit (zT) attained was 1.2. This accelerated synthesis method offers a significant advantage for large-scale manufacturing. © 2025 Elsevier B.V.

关键词： Polycrystalline materials

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Band convergence boosted high thermoelectric performance of Zintl compound Mg_(3)Sb_(2) achieved by biaxial strains

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Journal of Materiomics 2022年第5期8卷 1086-1094页

作者： Suiting Ning Shan Huang Ziye Zhang Ning Qi Man Jiang Zhiquan Chen Xinfeng Tang Hubei Nuclear Solid Physics Key Laboratory Department of PhysicsWuhan UniversityWuhan430072China Department of Nuclear Engineering and Technology School of Energy and Power EngineeringHuazhong University of Science and TechnologyWuhan430073China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China

Mg_(3)Sb_(2) as a Zintl compound is a promising thermoelectric material with the intrinsically low lattice thermal conductivity and excellent n-type electrical properties,but its p-type electrical transport properties are ***,the thermoelectric performance of Mg_(3)Sb_(2) under the effect of biaxial strain is investigated by using first-principles method and Boltzmann transport *** application of biaxial strain enables tuning the band structure of Mg_(3)Sb_(2) in such a way that the band degeneracy of both the conduction band and valence band *** the biaxial strain increases,the Seebeck coefficient of ptype Mg_(3)Sb_(2) has a remarkable increase,leading to a significant improvement in power *** is mainly ascribed to the achievement of valence band orbital ***,the lattice thermal conductivity exhibits very slight biaxial strain dependence within the strain range considered in this work,which increases from 1.28 to 1.62 W m^(-1) K^(-1) at 300 ***,the highest ZT of p-type Mg_(3)Sb_(2) at 700 K can be up to 2.6 along the in-plane direction under-2.5%biaxial strain,which is almost three times that of the unstrained *** realization of high thermoelectric performance of p-type Mg_(3)Sb_(2) will promote its practical applications as thermoelectric generators.

关键词： Thermoelectric First-principles Crystal field splitting energy Band convergence

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