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Interfacial reaction behavior and mechanical properties of 5A06 Al alloy soldered with Sn-1Ti-xGa solders at a low temperature

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China Welding 2023年第2期32卷 23-31页

作者：宋立志肖勇奚邦富李佳琪张建 School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Active soldering of 5A06 Al alloy was performed at 300 ℃ by using Sn-1Ti and Sn-1Ti-0.3Ga active solders, respectively. Theeffects of soldering time on the microstructure and mechanical properties of the joints were investigated. The results showed that the Sn-1Tisolder broke the oxide film on the surface of the Al substrate and induced intergranular diffusion in the Al substrate. When Ga was added tothe solder, severe dissolution pits appeared in the Al substrate due to the action of Sn-1Ti-0.3Ga solder, and many Al particles were flakedfrom the matrix into the solder seam. Under thermal stress and the Ti adsorption effect, the oxide film cracked. With increasing solderingtime, the shear strength of 5A06 Al alloy joints soldered with Sn-1Ti and Sn-1Ti-0.3Ga active solders increased. When soldered for 90 min,the joint soldered with Sn-1Ti-0.3Ga solder had a higher shear strength of 22.12 MPa when compared to Sn-1Ti solder.

关键词： 5A06-Al alloy Sn-Ti-Ga solder low-temperature soldering interfacial reaction mechanical properties

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Interface optimization and defects suppression via Na F introduction enable efficient flexible Sb_(2)Se_(3) thin-film solar cells

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Journal of Energy Chemistry 2024年第3期90卷 165-175,I0006页

作者： Mingdong Chen Muhammad Ishaq Donglou Ren Hongli Ma Zhenghua Su Ping Fan David Le Coq Xianghua Zhang Guangxing Liang Shuo Chen Shenzhen Key Laboratory of Advanced Thin Films and Applications Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060GuangdongChina State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures MOE Key Laboratory of New Processing Technology for Nonferrous Metals and MaterialsSchool of ResourcesEnvironment and MaterialsGuangxi UniversityNanning 530004GuangxiChina CNRS ISCR(Institut des Sciences Chimiques de Rennes)UMR 6226Universitéde RennesRennes F-35000France

Sb_(2)Se_(3) with unique one-dimensional(1D) crystal structure exhibits exceptional deformation tolerance,demonstrating great application potential in flexible ***,the power conversion efficiency(PCE) of flexible Sb_(2)Se_(3) photovoltaic devices is temporarily limited by the complicated intrinsic defects and the undesirable contact ***,a high-quality Sb_(2)Se_(3) absorber layer with large crystal grains and benign [hkl] growth orientation can be first prepared on a Mo foil *** NaF intermediate layer is introduced between Mo and Sb_(2)Se_(3),which can further optimize the growth of Sb_(2)Se_(3)thin ***,positive Na ion diffusion enables it to dramatically lower barrier height at the back contact interface and passivate harmful defects at both bulk and *** a result,the champion substrate structured Mo-foil/Mo/NaF/Sb_(2)Se_(3)/CdS/ITO/Ag flexible thin-film solar cell delivers an obviously higher efficiency of 8.03% and a record open-circuit voltage(V_(OC)) of 0.492 *** flexible Sb_(2)Se_(3) device also exhibits excellent stability and flexibility to stand large bending radius and multiple bending times,as well as superior weak light photo-response with derived efficiency of 12.60%.This work presents an effective strategy to enhance the flexible Sb_(2)Se_(3) device performance and expand its potential photovoltaic applications.

关键词： Sb_(2)Se_(3) Flexible solar cells NaF intermediate layer Interface optimization Defects suppression

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Robust architecture of 2D nano Mg-based borohydride on graphene with superior reversible hydrogen storage performance

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Journal of materials Science & technology 2023年第15期146卷 121-130页

作者： Xuancheng Wang Yuxiao Jia Xuezhang Xiao Panpan Zhou Jiapeng Bi Jiacheng Qi Ling Lv Fen Xu Lixian Sun Lixin Chen State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China Guangxi Collaborative Innovation Center of Structure and Property for New Energy and Materials School of Material Science and EngineeringGuilin University of Electronic TechnologyGuilin 541004China Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province Hangzhou 310013China

Efficient technical strategies to synthesize hydrides with high capacity and favorable reversibility are significant for the development of novel energy ***,nano Mg-based borohydride,Mg(BH_(4))_(2),with robust architecture was designed and prepared by confining on graphene through a solution selfconfinement *** Mg(BH_(4))_(2) confined on graphene displays a wrinkled 2D nano layer morphology within 8.8 nm *** 2D nano Mg(BH_(4))_(2) can start dehydrogenation at 67.9℃ with a high capacity of 12.0 wt.%,which is 190.5℃ lower than pristine Mg(BH_(4))_(2).The isothermal dehydrogenation tests and kinetics fitting results indicate the 2D nano Mg(BH_(4))_(2) possesses much-enhanced dehydrogenation kinetics of 31.3 kJ/mol activation energy,which is only half of pristine Mg(BH_(4))_(2).The thermodynamics of the 2D nano Mg(BH_(4))_(2) is also verified by PCT tests,of which Gibbs free energy value for the confined 2D nano Mg(BH_(4))_(2) is estimated to be-18.01 kJ/mol H_(2),lower than-16.36 kJ/mol H_(2) of pristine Mg(BH_(4))_(2).Importantly,the reversibility of the confined 2D nano Mg(BH_(4))_(2) is significantly enhanced to over 90%capacity retention with relatively kinetics stability during 10 *** mechanism analyses manifest that Mg(BH_(4))_(2) exhibits stable 2D nano morphology during 10 cyclic tests,resulting in the greatly reduced H diffusion path and the improved de/rehydrogenation kinetics of the 2D nano Mg(BH_(4))_(2).Based on theoretical calculations of Mg(BH_(4))_(2) and the intermediate MgB12H12 confined on graphene,the charge transfer status of both samples is modified to facilitate de/rehydrogenation,thus leading to the significant thermodynamic improvements of the reversible hydrogen storage performances for 2D nano Mg(BH_(4))_(2).Such investigation of the Mg-based borohydride will illuminate prospective technical research of energy storage materials.

关键词： Mg(BH_(4))_(2) Nano-confinement Kinetics Thermodynamics Reversible hydrogen storage

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Ni Flower/MXene-Melamine Foam Derived 3D Magnetic/Conductive Networks for Ultra-Efficient Microwave Absorption and Infrared Stealth

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Nano-Micro Letters 2022年第4期14卷 142-157页

作者： Haoran Cheng Yamin Pan Xin Wang Chuntai Liu Changyu Shen Dirk W.Schubert Zhanhu Guo Xianhu Liu Key Laboratory of Advanced Material Processing&Mold(Ministry of Education) National Engineering Research Center for Advanced Polymer Processing TechnologyCollege of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450002People’s Republic of China Institute of Polymer Materials Friedrich-Alexander-University Erlangen-NurembergMartensstr.791058 ErlangenGermany Integrated Composites Laboratory(ICL) Department of Chemical&Biomolecular EngineeringUniversity of TennesseeKnoxvilleTN 37996USA

The development of multifunctional and efficient electromagnetic wave absorbing materials is a challenging research ***,the magnetized Ni flower/MXene hybrids are successfully assembled on the surface of melamine foam(MF)through electrostatic self-assembly and dip-coating adsorption process,realizing the integration of microwave absorption,infrared stealth,and flame ***,the Ni/MXene-MF achieves a minimum reflection loss(RLmin)of−62.7 dB with a corresponding effective absorption bandwidth(EAB)of 6.24 GHz at 2 mm and an EAB of 6.88 GHz at 1.8 *** electromagnetic wave absorption is attributed to the three-dimensional magnetic/conductive networks,which provided excellent impedance matching,dielectric loss,magnetic loss,interface polarization,and multiple *** addition,the Ni/MXene-MF endows low density,excellent heat insulation,infrared stealth,and flame-retardant *** work provided a new development strategy for the design of multifunctional and efficient electromagnetic wave absorbing materials.

关键词： Ni-MXene/Melamine foam Microwave absorption Heat insulation Infrared stealth Flame-retardant

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Carbon composite support improving catalytic effect of NbC nanoparticles on the low-temperature hydrogen storage performance of MgH_(2)

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Journal of materials Science & technology 2023年第19期150卷 65-74页

作者： Yuxiao Jia Xuancheng Wang Leijie Hu Xuezhang Xiao Shuoqing Zhang Jiahuan He Jiacheng Qi Ling Lv Fen Xu Lixian Sun Lixin Chen State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province Hangzhou 310013China Guangxi Collaborative Innovation Center of Structure and Property for New Energy and Materials School of Material Science and EngineeringGuilin University of Electronic TechnologyGuilin 541004China

Ultrafine carbon-based transition metal compounds have been widely investigated as efficient catalysts for enhancing the hydrogen storage performance of magnesium *** this work,the carbon ther-mal shock method is applied to synthesize the ultrafine carbon-encapsulated NbC nanoparticles with an average grain size of 17.3 *** MgH_(2)-10 wt%NbC/C composites show excellent low-temperature hy-drogen storage performance with the onset dehydrogenation temperature of 196.1℃,which is 92.2℃ and 98℃ lower than that of MgH_(2)-10 wt%NbC and undoped MgH_(2),***,MgH_(2)-10 wt%NbC/C can absorb 6.71 wt%H_(2) at 100℃ within 30 min around and retain almost 100%reversible hydrogen desorption capacity after 10 *** the catalytic mechanism,the electron transfer process between multi-valence Nb cations of in-situ formed NbH x and Mg,H atoms can greatly improve the cyclic de/rehydrogenation kinetics of MgH_(2)-NbC/***,the enhancement of dehydrogenation kinetics can also be ascribed to MgH_(2) particle refinement by NbC nanoparticles,and destabilization of the Mg-H bond caused by carbon *** investigation not only proves that carbon-encapsulated NbC nanoparti-cles can greatly enhance the hydrogen storage performance of MgH_(2) but provides an idea of preparing carbon-based transition metal carbides as effective catalysts for magnesium-based hydrogen storage ma-terials.

关键词： MgH_(2) Carbon-encapsulated Nanoparticles Catalyst Kinetics

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Printing strategies for scaling-up perovskite solar cells

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National Science Review 2021年第8期8卷 69-92页

作者： Yulong Wang Changyu Duan Pin Lv Zhiliang Ku Jianfeng Lu Fuzhi Huang Yi-Bing Cheng Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Department of Materials Science and Engineering Monash University

Photovoltaic technology offers a sustainable solution to the problem of soaring global energy ***, metal halide perovskite solar cells(PSCs) have attracted worldwide interest because of their high power conversion efficiency of 25.5% and great potential in becoming a disruptive technology in the photovoltaic industry. The transition from research to commercialization requires advancements of scalable deposition methods for both perovskite and charge transporting thin films. Herein, we share our view regarding the current challenges to fabrication of PSCs by printing techniques. We focus particularly on ink technologies, and summarize the strategies for printing uniform, pinhole-free perovskite films with good crystallinity. Moreover, the stability of perovskite solar modules is discussed and analyzed. We believe this review will be advantageous in the area of printable electronic devices.

关键词： printing technology perovskite solar cells ink large-area crystallization module stability

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3D-Printed Superhydrophobic and Magnetic Device That Can Self-Powered Sense A Tiny Droplet Impact

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Engineering 2022年第8期8卷 196-205页

作者： Xuan Zhang Qi Wang Ruiping Zou Bo Song Chunze Yan Yusheng Shi Bin Su State Key Laboratory of Material Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China ARC Research Hub for Computational Particle Technology Department of Chemical EngineeringMonash UniversityClayton VIC 3800Australia

Three-dimensional(3D)-printed magnetic soft architectures have attracted extensive attention and research from the engineering and material *** force-driven shape deformation of such architectures causes a change in the magnetic field distribution,indicating the capability to convert mechanical energy to ***,we fabricate a flexible superhydrophobic and magnetic device by integrating two kinds of 3D printing *** 3D-printed magnetic device(3DMD)exhibits a long-term stable mechanoelectrical conversion capacity under consecutive water droplet *** output current of the 3DMD is higher than that of records in the existing *** with Maxwell numerical simulation,the mechanoelectrical conversion mechanism of the 3DMD is investigated,further guiding regulation of the diverse ***,three 3DMDs are integrated to light up a commercial light-emitting diode(LED)by a stream of collected *** a combined design incorporating energy conversion is believed to promisingly motive advances in the 3D printing field.

关键词： 3D printing Self-powered sensing Magnetic Waterdrops

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Effect of Pr-Ga dual-alloys diffusion on magnetic properties and thermal stability of hot-deformed PrNd-Fe-B magnets

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Journal of Rare Earths 2022年第3期40卷 457-461,I0004页

作者： Longquan Hou Jinyun Ju Wenzong Yin Xu Tang Renjie Chen Ailin Xia Yeyuan Du Ruihua Du Aru Yan Anhui Key Laboratory of Metal Materials and Processing School of Materials Science and EngineeringAnhui University of TechnologyMaanshan 243002China Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Material Technology and EngineeringChinese Academy of SciencesNingbo 315201China University of Chinese Academy of Sciences Beijing 100049China

To investigate the influence of the addition of Pr-Ga alloys on magnetic properties and morphology of materials,the hot-deformed PrNd-Fe-B magnets were prepared by the addition of Pr-Ga alloys using a dual-alloys *** room-temperature coercivity of the hot-deformed PrNd-Fe-B magnets increases substantially from 1.68 to 2.34 T,while the remanence decreases from 1.42 to 1.24 T,by the addition of 5 wt%Pr-Ga ***,the thermal stability of coercivity improves from-0.46%/℃to-0.42%/℃.Two types of grain boundary phases(PrNd-rich and PrNd-Ga-rich)are generated at grain boundaries by microstructural analysis,resulting in the decrease of Fe element concentration from more than 60%to about 10%at grain *** decrease of ferromagnetic element concentration at grain boundaries and the refinement of grain are considered to be the main reasons for the improvement of coercivity and thermal stability.

关键词： Hot-deformed PrNd-Fe-B Dual-alloys diffusion Magnetic properties Rare earths

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高电压高镍三元锂离子电池电解液设计

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Science China materials 2023年第8期66卷 3046-3053页

作者：胡莙程方圆方淳韩建涛 State Key Laboratory of Material Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)因具有高容量和相对低的成本,是高能量密度锂离子电池中最有前途的正极材料之一.然而,在高截止电压下,它仍然存在不可逆的容量衰减问题.主要原因是高电压加速了六氟磷酸锂与微量水的水解反应,... 详细信息

LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)因具有高容量和相对低的成本,是高能量密度锂离子电池中最有前途的正极材料之一.然而,在高截止电压下,它仍然存在不可逆的容量衰减问题.主要原因是高电压加速了六氟磷酸锂与微量水的水解反应,产生副产物,如高腐蚀性HF,导致不稳定的正极-电解液界面和持续的不可逆相变.在这里,我们通过添加钛酸四丁酯和二氟草酸硼酸锂双重添加剂来改善传统的电解液,以形成一个稳定的富含Ti、B和F的界面层,从而消除不利的正极-电解液副反应并抑制有害相变.此外,钛酸四丁酯可以通过去除H_(2)O/HF来稳定电解液.在双重添加剂的协同作用下,NCM811在高电压下的循环稳定性得到明显增强.采用双添加剂的Li||NCM811电池在1 C和4.5 V的高截止电压下循环200次后具有86%的高容量保持率.该方法为设计锂离子电池的高电压电解液提供了参考.

关键词：六氟磷酸锂锂离子电池二氟草酸硼酸锂高电压电解液正极材料容量衰减截止电压高镍

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High-performance thermal interface materials enabled by vertical alignment of lightweight and soft graphene foams

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Nano Research 2024年第11期17卷 9293-9299页

作者： Huaqiang Fu Renqiang Fang Chao Tian Wei Qian Shiya Cao Ziran Zhang Xiaoxi Xu Chuang Yao Zhe Wang Daping He School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China Hubei Engineering Research Center of RF-Microwave Technology and Application School of Science Wuhan University of Technology Wuhan 430070 China School of Materials and Microelectronics Wuhan University of Technology Wuhan 430070 China Shanghai Institute of Satellite Engineering Shanghai 201109 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

High-performance thermal interface materials (TIMs) are highly sought after for modern electronics. Two-dimensional (2D) materials as vertical aligned fillers can optimize the out-plane thermal conductivity (k ⊥), but their excessively high content or intrinsic rigidness deteriorate TIMs softness, leading to worsening for thermal contact resistance (R contact). In this study, 2D graphene materials are fabricated into lightweight and soft graphene foams (GFs) with high-orientation, acting as vertical filler frameworks to optimize the k ⊥ and R contact for vertical GF (VGF) TIMs. The VGF-TIM has a high k ⊥ of 47.9 W·m^(−1)·K^(−1) at a low graphene content of 15.5 wt.%. Due to the softness and low filler contents of GFs, the VGF-TIM exhibits a low compressive module (4.2 MPa), demonstrating excellent compressibility. The resulting TIM exhibit a low contact resistance of 24.4 K·mm2·W^(−1), demonstrating 185.1% higher cooling efficiency in practical heat dissipating scenario compared to commercial advanced TIMs. This work provides guidelines for the design of advanced TIMs and their applications in thermal management.

关键词： graphene foam thermal resistance thermal conductivity thermal interface materials

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