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Ferroelectric engineering:Enhanced thermoelectric performance by local structural heterogeneity

Science China materials 2022年第6期65卷 1615-1622页

作者： Xiangyu Meng Shuo Chen Haoyang Peng Hui Bai Shujun Zhang Xianli Su Gangjian Tan Gustaaf Van Tendeloo Zhigang Sun Qingjie Zhang Xinfeng Tang Jinsong Wu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Nanostructure Research Center Wuhan University of TechnologyWuhan 430070China Institute for Superconducting and Electronic Materials Australian Institute for Innovative MaterialsUniversity of WollongongWollongongNSW 2500Australia EMAT(Electron Microscopy for Materials Science) University of AntwerpBelgium

Although traditional ferroelectric materials are usually dielectric and nonconductive,GeTe is a typical ferroelectric semiconductor,possessing both ferroelectric and semiconducting *** is also a widely studied thermoelectric material,whose performance has been optimized by doping with various ***,the impact of the ferroelectric domains on the thermoelectric properties remains unclear due to the difficulty to directly observe the ferroelectric domains and their evolutions under actual working conditions where the material is exposed to high temperatures and electric ***,based on in-situ investigations of the ferroelectric domains and domain walls in both pure and Sb-doped GeTe crystals,we have been able to analyze the dynamic evolution of the ferroelectric domains and domain walls,exposed to an electric field and *** structural heterogeneities and nano-sized ferroelectric domains are generated due to the interplay of the Sb^(3+)dopant and the Ge-vacancies,leading to the increased number of charged domain walls and a much improved thermoelectric *** work reveals the fundamental mechanism of ferroelectric thermoelectrics and provides insights into the decoupling of previously interdependent properties such as thermo-power and electrical conductivity.

关键词： charged domain walls bound charge local structural heterogeneity high-performance thermoelectric

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Groups-dependent phosphines as the organic redox for point defects elimination in hybrid perovskite solar cells

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Journal of Energy Chemistry 2021年第3期30卷 23-29页

作者： Zhengli Wu Miao Zhang Yifan Liu Yuxi Dou Yinjie Kong Lin Gao Weitao Han Guijie Liang Xiao Li Zhang Fuzhi Huang Yi-Bing Cheng Jie Zhong State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen ValleyFoshan 528200GuangdongChina Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices Hubei University of Arts and ScienceXiangyang 441053HubeiChina School of Materiale Science and Engineering Zhengzhou UniversityZhengzhou 450001HenanChina Department of Materials Science and Engineering Monash UniversityVIC 3800Australia

Lead(Pb)^(0) and iodine(I)^(0) point defects generated during perovskite solar cell(PSC)fabrication and photoconversion form deep band energy levels as the carriers’recombination *** defects not only deteriorate device efficiency,but also facilitate chemical degradation with ion migration,resulting in restricted device ***,we present a novel type of phosphines as the point defects stabilizer for hybrid perovskite solar cells with enhanced *** phosphines with varied side groups of tributyl,trioctyl and triphenyl are exampled as the dopants in perovskite *** group dependent redox properties were observed in the perovskite film,dependent on their molecular weights and steric hinderances of *** partially oxidized tributyl phosphine(TBUP)with additional tributyl phosphine oxides(TBPO)is efficient in reduction of lead(Pb)^(0) and iodine(I)^(0) concentrations during the device fabrication and *** device with TBUP-TBPO pair showed enhanced power conversion efficiency(PCE)to 20.48% and maintain 91.7% of their initial PCEs after 500 h at 65℃ thermal ***,this work presents an efficient route of utilize the phosphine species to reduce point defects in the perovskite film,which promoting further development of novel phosphorous additives with defects stabilization,interface passivation and encapsulation for low-cost solution processed PSCs.

关键词： Redox Perovskite solar cells Phosphine organics Lead defect Stability

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Crystal Structure, Cation Distribution and Electrical Properties in NixAlyMn3-x-yO4 (0 < X < 0.6;0 < Y < 0.3) Spinel-Based Ntc Chip Thermistors

SSRN

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SSRN 2023年

作者： Shao, Gang-Qin Cen, Quan-Jin Chen, Zhi-Hua Zhang, Ji-Wei Xie, Meng-Xiang Li, Qiang Cao, Xiu-Hua Wang, Wen-Hao Wang, Yan-Pei Wu, Hou-Ran Hu, Chun-Yuan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Hubei Wuhan430070 China State Key Laboratory of Advanced Materials and Electronic Components Guangdong Fenghua Advanced Technology Holding Co. Ltd. 18 Fenghua Road Guangdong Zhaoqing526060 China

关键词： Manganites

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Directing Ni/Al Layered Double Hydroxides Nanosheets on Tubular Graphite Carbon Nitride for Promoted Photocatalytic Hydrogen Production

SSRN

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SSRN 2024年

作者： Jiang, Ze-Yu Ran, Mao-Jin Liu, Kai Huang, Yi-Fu Li, Zhi-Rong Shen, Ting-Ting Li, Wan-Ying Khojiev, Shokir Hu, Zhi-Yi Liu, Jing Chen, Li-Hua Li, Yu Su, Bao-Lian State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Hubei Wuhan430070 China Wuhan University of Technology 122 Luoshi Road Hubei Wuhan430070 China Center for Advanced Technology under Agency for Innovative Development of the Republic of Uzbekistan The Ministry of Higher Education Science and Innovation University Street 3A Tashkent100174 Uzbekistan University of Namur 61 rue de Bruxelles NamurB-5000 Belgium State Key Laboratory of Advanced Technology for Materials Synthesis and Processing China

Constructing heterojunctions via in-situ growth or mechanical mixing have been widely used for improving the photogenerated carrier separation and photocatalytic activity. However, interface transfer impedance and the charge transfer channels of heterojunction prepared by in-situ method are rarely discussed. In this work, we use tubular g-C3N4 (TCN) as the basic photocatalyst and in-situ growth of nickel/aluminum layered double hydroxide (LDH) nanosheets as co-catalyst on the surface of TCN (TCN@Ni/Al-LDH) to show the advantage of the in-situ constructing heterojunction for highly enhanced photocatalytic hydrogen production. The results show that the TCN@Ni/Al-LDH-60 exhibits the best hydrogen production performance of 1428 μmol h-1 g-1, which is 53.3 and 21.33 times higher than that of TCN and mechanical prepared TCN/Ni/Al-LDH-60. For the first time, we propose a statistics model to reveal that the contact area of the heterojunction TCN@Ni/Al-LDH-60 is 2.88 times that of TCN/Ni/Al-LDH-60. This largely increases the charge transfer channels for the photogenerated carrier transport. In addition, the in-situ growth of TCN@Ni/Al-LDH composites increases the active sites, which improves the utilization efficiency of the photogenerated electrons. This study would shed some light on analyzing the in-situ constructing heterojunction photocatalysts for efficient photocatalytic hydrogen production through photocatalytic water splitting. © 2024, The Authors. All rights reserved.

关键词： Heterojunctions

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Elevating the d-Band Center of Ni3S2Nanosheets by Fe Incorporation to Boost the Oxygen Evolution Reaction

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Langmuir 2023年第15期39卷 5375-5383页

作者： Jie Ying Zhen-Zhao He Jiang-Bo Chen Yu-Xuan Xiao Xiao-Yu Yang School of Chemical Engineering and Technology Sun Yat-sen University Zhuhai 519082 China State Key Laboratory Advanced Technology for Materials Synthesis and Processing & School of Materials Science and Engineering & Shenzhen Research Institute & Joint Laboratory for Marine Advanced Materials in Pilot National Laboratory for Marine Science and Technology (Qingdao) Wuhan University of Technology 122 Luoshi Road Wuhan 430070 China

Many attempts have been made to enhance the relatively poor electrochemical activity of Ni3S2 for the oxygen evolution reaction (OER) by elevating the d-band center. Unfortunately, only limited suc...

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Biomimetic brain-like nanostructures for solid polymer electrolytes with fast ion transport

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Science China materials 2022年第6期65卷 1476-1484页

作者： Ahmed Eissa Abdelmaoula Lulu Du Lin Xu Yu Cheng Amir AMahdy Muhammad Tahir Ziang Liu Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen ValleyFoshan 528200China Mining and Metallurgical Department Faculty of EngineeringAl-Azhar UniversityCairo 11884Egypt

The intrinsic drawbacks of electrolytes and the growth of lithium dendrites limit the development of commercial lithium *** address the aforementioned challenges,a novel biomimetic brain-like nanostructure(BBLN)solid polymer electrolyte was created by manipulating the shape of the incorporated *** designed BBLN solid polymer electrolyte was created by incorporating spherical core-shell(UIO-66@67)fillers into polymer electrolyte,which is significantly different from traditional polymer-based composite ***-66@67 spherical nanoparticles are highly favorable to eliminating polymer electrolyte stress and deformation during solidification,indicating a great potential for fabricating highly uniform BBLN solid polymer electrolytes with a substantial number of continuous ***,spherical nanoparticles can significantly reduce the crystalline structure of polymer electrolytes,improving polymer chain segmental movement and providing continuous pathways for rapid ion *** a result,BBLN solid polymer electrolyte shows excellent ionic conductivity(9.2×10^(−4)S cm^(−1)),a high lithium transference number(0.74),and outstanding cycle stability against lithium electrodes over 6500 h at room *** concept of biomimetic brain-like nanostructures in this work demonstrates a novel strategy to enhance ion transport in polymerbased electrolytes for solid-state batteries.

关键词： brain structure spherical nanoparticles continuous interphase nanophase separation MOF-in-MOF

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Accelerated Solid-Liquid Interdiffusion Bonding of Cu Joint Using a Cu10ni Alloy Mesh Reinforced Sac305 Composite Solder

SSRN

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SSRN 2023年

作者： Liu, Jiajun Xiao, Yong Li, Dan Liu, Bowen Yan, Fei Zhang, Jian School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

Highly reliable packaging interlayer materials are essential for utilizing the benefits of wide band-gap power devices. In this study, a two-dimensional mesh structure of Cu-10Ni (wt.%) alloy skeleton-reinforced SAC305 (Sn-3.0Ag-0.5Cu, wt.%) solder was employed to create solid-liquid interdiffusion (SLID) bonding connections on a Cu substrate at 250 °C and 0.03 MPa auxiliary pressure. The microstructural evolution and the mechanical property strengthening mechanisms of bonded joints with different composite solders were investigated. Due to the addition of Cu-10Ni alloy skeleton, the Cu-Ni atoms diffused into the Sn melt and acted as heterogeneous nucleation sites, contributing to the rapid nucleation and growth of (Cu,Ni)6Sn5 grains. The incorporation of Ni inhibited the merging and coarsening of intermetallic compound (IMC) grains, and the joint was composed of fine-grained (Cu,Ni)6Sn5 phase and interspersed Cu10Ni skeleton. Shear strength of the joint at soldering time 210 s reached 47.75 MPa, marking a 104.58% enhancement compared to the pristine SAC305 solder joint. The influence of grain refinement on the mechanical properties of the joint was discussed based on the Hall–Petch relationship. The grain boundary strengthening effect synergized with the toughening effect of the alloy skeleton, ultimately achieving highly reliable joints. © 2023, The Authors. All rights reserved.

关键词： Nucleation

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AI-driven material discovery for energy, catalysis and sustainability

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National Science Review 2025年第5期 77-78页

作者： Ning Han Bao-Lian Su Department of Electrical and Computer Engineering University of Toronto Laboratory of Inorganic Materials Chemistry(CMI) University of Namur State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Artificial intelligence (AI) is revolutionizing various sectors, including science,technology, industry and daily life [1,2].One key area where AI can make a significant impact is in material design, crucial for advan...

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S-scheme photocatalyst Bi2O3/TiO2 nanofiber with improved photocatalytic performance

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Journal of materials Science & technology 2020年第17期52卷 145-151页

作者： Rongan He Haijuan Liu Huimin Liu Difa Xu Liuyang Zhang Hunan Province Key Laboratory of Applied Environmental Photocatalysis Changsha UniversityChangsha 410022China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

In this study,a hierarchical Bi2O3/TiO2 fibrous composite was in-situ fabricated on an electrospun TiO2 nanofiber at ambient *** the Bi2O3/TiO2 composite,S-scheme electron migration occurred between Bi2O3 and *** the photocatalytic degradation of phenol under simulated sunlight,the asprepared Bi2O3/TiO2 nanofibers considerably outperformed Bi2O3 nanoparticles and TiO2 *** improvement is contributed by maintaining and effectively utilizing the useful carriers and consuming the useless holes and electrons,realized by the S-scheme heterojunction and hierarchical *** study also provides an alternative design fashion for photocatalysts.

关键词： Electrospinning Bismuth Fiber In-situ synthesis

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Predictive Damage Evolution and Fracture Behavior in High-Carbon Steel Via Multiscale Simulation and Experiments

SSRN

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SSRN 2024年

作者： Wang, Huiling Wang, Feng Qian, Dongsheng Dong, Zhaohua Tian, Han Hua, Lin Chen, Jiancheng School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Hubei Engineering Research Center for Green Precision Material Forming Wuhan430070 China Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan430070 China

High-carbon steel consisting of soft ferrite and hard cementite is susceptible to micro-defects owing to the mismatched deformation between the ferrite and cementite during cold forming, which seriously deteriorates the fatigue life. However, the investigation of the damage and failure behavior in high-carbon steel during cold deformation remains largely undisclosed, which hinders further control of the microstructure and forming process. The current work investigates the damage evolution and fracture behavior related to the microstructural characteristics of spheroidized ferrite-cementite steel. A multiscale modeling framework is presented by coupling macroscale finite element (FE) simulation, mesoscale representative volume element (RVE) modeling, and nanoscale molecular dynamics (MD) simulation to analyze largescale plastic deformation and damage characteristics. In particular, the Gurson-Tvergaard-Needleman (GTN) damage model is used to predict the fracture behavior of the macroscale FE model. The uncoupled Rice-Tracy law and the maximum principal stress criterion are utilized to simulate the mesoscale damage behavior. The cohesive zone model (CZM) in the form of B-K constitutive law is utilized to simulate the interfacial decohesion. The GTN model parameters are evaluated by the response surface method (RSM). The nanoscale molecular dynamics simulations are conducted to obtain matrix-particle interface strength properties under the mixed loading. The mechanical property of ferrite phase was calibrated by the inverse analysis method based on genetic algorithm (GA). The failure model parameters of two phases are identified by DIC test results. The macroscale simulations accurately predict damage and fracture behavior of high-carbon steel. The results show that the voids preferentially initiate at the two-phase interface with the smallest spacing between particles. Subsequently, voids grow along the boundary of the cementite particles and then coalesce to form a c

关键词： Ferrite

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