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Microwave Solvothermal Synthesis and Hthp Sintering of Cosb3/Rgo composites:In-Situ Synthesis and Enhanced Thermoelectric Properties

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SSRN 2023年

作者： Wu, Zhangping Yin, Kaili Guan, Chunlong Zhang, Shijie Qian, Yanju Zhao, Xiaomiao Shi, Liping Liu, Junlong Tian, Ye Zhao, Zhiwei Henan University of Technology School of Materials Science and Engineering Zhengzhou China Harbin Institute of Technology National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin China Zhengzhou Research Institute for Abrasives & Grinding Co. Ltd State Key Laboratory for High Performance Tools China Henan University of Technology School of Mechanical and Electrical Engineering Zhengzhou China Henan University of Technology China

The utilization of CoSb3-based thermoelectric materials is currently confined to aviation applications, primarily attributed to their elevated thermal conductivity (κ) values. The incorporation of a nanostructuring approach, coupled with the introduction of a secondary phase, has demonstrated efficacy in diminishing the thermal conductivity (κ) values of CoSb3 materials. Here, the CoSb3/reduced graphene oxide (CoSb3/rGO) composites are obtained by sintering the as-powders, which ultra-fast synthesized in situ via microwave solvothermal method, under the High-temperature and High-Pressure (HTHP) conditions. The influence of reduced graphene oxide (rGO) on the structural and thermoelectric characteristics of CoSb3 composites has been systematically explored. In this study, CoSb3 nanoparticles with an average size of ~33 nm exhibit uniform distribution, being effectively anchored onto the 2D sheets of rGO. With the addition of rGO, the lattice thermal conductivity of CoSb3/rGO composites decreases due to the interfacial scattering occurring at the interfaces formed between CoSb3 nanocrystalline and lamellar rGO. As a result, the CoSb3/rGO composite, containing 2 wt.% graphene, exhibits a significantly enhanced maximum thermoelectric figure of merit (ZT) value, reaching ~0.325 at 700 K. This represents an impressive improvement of approximately 300% compared to the ZT value of the graphene-free CoSb3 bulk counterpart, which is ~0.106. This study demonstrates the microwave solvothermal synthesis and HTHP sintering are in favor for an efficient, economical, and controllable synthesis of CoSb3/rGO composites, which provides a novel strategy for securing better thermoelectric performance. © 2023, The Authors. All rights reserved.

关键词： Nanocrystals

Heterogeneous FASnI3 Absorber with Enhanced Electric Field for High-Performance Lead-Free Perovskite Solar Cells

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Nano-Micro Letters 2022年第6期14卷 234-247页

作者： Tianhao Wu Xiao Liu Xinhui Luo Hiroshi Segawa Guoqing Tong Yiqiang Zhang Luis KOno Yabing Qi Liyuan Han State Key Laboratory of Metal Matrix Composites School of Material Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240People’s Republic of China Special Division of Environmental and Energy Science Komaba Organization for Educational Excellence(KOMEX)College of Arts and SciencesUniversity of TokyoTokyo 153-8902Japan Energy Materials and Surface Sciences Unit(EMSSU) Okinawa Institute of Science and Technology Graduate University(OIST)1919-1 TanchaOnna-sonKunigami-gunOkinawa 904-0495Japan School of Materials Science and Engineering Henan Institute of Advanced TechnologyZhengzhou UniversityZhengzhou 450001People’s Republic of China

Lead-free tin perovskite solar cells(PSCs)have undergone rapid development in recent years and are regarded as a promising ecofriendly photovoltaic ***,a strategy to suppress charge recombination via a built-in electric field inside a tin perovskite crystal is still *** the present study,a formamidinium tin iodide(FASnI;)perovskite absorber with a vertical Sn;gradient was fabricated using a Lewis base-assisted recrystallization method to enhance the built-in electric field and minimize the bulk recombination loss inside the tin ***-dependent X-ray photoelectron spectroscopy revealed that the Fermi level upshifts with an increase in Sn;content from the bottom to the top in this heterogeneous FASnI;film,which generates an additional electric field to prevent the trapping of photo-induced electrons and ***,the Sn;-gradient FASnI;absorber exhibits a promising efficiency of 13.82%for inverted tin PSCs with an open-circuit voltage increase of 130 mV,and the optimized cell maintains over 13%efficiency after continuous operation under 1-sun illumination for 1,000 h.

关键词： Gradient FASnI3 absorber Built-in electric field Bulk charge recombination Lead-free perovskite solar cell

Surface-Enhanced Transparent Conducting P-Type Cui−Ga2o3 Composite Films with High Hole Transport Performance and Stability

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SSRN 2023年

作者： Xue, Ruibin Gao, Gang Yang, Lei Xu, Liangge Zhang, Yumin Zhu, Jiaqi National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China Center of Analysis Measurement Harbin Institute of Technology Harbin150001 China Zhengzhou Research Institute Harbin Institute of Technology Zhengzhou450046 China Key Laboratory of Micro-systems and Micro-structures Manufacturing Ministry of Education Harbin Institute of Technology Harbin150080 China

CuI is a wide bandgap p-type transparent conductor with promising optoelectronic properties. However, conventional CuI films prepared through the iodination of Cu films exhibit rough surface, poor stability and excessively high hole concentration, hindering its application. Herein, we introduce CuI−Ga2O3 composite films as a substitution to overcome the shortcomings of pure CuI. During the iodination process, Ga2O3 hinders the mobility of CuI grain boundaries, resulting in small grain size and low surface roughness. After the charge re-equilibrium between Ga2O3 and CuI, the hole concentration in the films decreased by an order of magnitude. The interface effect of Ga2O3 at the grain boundaries of CuI, increases the hole mobility by 5 times and the conductivity by 53%. The ultra-wide band gap of Ga2O3 enhances the transmittance of CuI films in short wavelength region. Ga2O3 serves to passivate the grain boundaries of CuI, preventing the oxidation of CuI and the loss of iodine, consequently improving the stability of the films. This work deepens the understanding of the failure and hole transport mechanisms of CuI films. © 2023, The Authors. All rights reserved.

关键词： Stability

Origami-Based Bidirectional Self-Locking System for Energy Absorption

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SSRN 2022年

作者： Chen, Zongbing Wei, Xingyu Yang, Lihong Xiong, Jian Center for Composite Materials and Structures Harbin Institute of Technology Harbin150001 China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China Key Laboratory of Advanced Ship Materials and Mechanics Harbin Engineering University Harbin150001 China

When a periodic structure is subjected to loads exceeding the material yield strength, dislocation slip occurs in its internal unit cells, resulting in a sharp decline in macro mechanical properties. Periodic structures with self-locking effect can overcome this inherent defect and achieve distinguished performance including high energy absorption efficiency. In this respect, thin-walled periodic self-locking dissipative structures have been extensively investigated in recent years. These existing self-locking systems belong to two-dimensional structures and can realize self-locking effect only under the specific load. This paper presents a three-dimensional origami-based bidirectional self-locking system, which can realize self-locking effect under the combined action of normal and shear stress. The energy absorption mechanism of the origami-based cell was revealed by the plastic hinge model, and its specific energy absorption is higher than that of other existing self-locking cells. The compression and bending tests of the origami-based system were carried out, which proved its bidirectional self-locking capacity. This proposed origami-based system possesses excellent energy absorption efficiency, and the unique bidirectional self-locking strategy can significantly expand the design space for periodic energy absorption metamaterials. © 2022, The Authors. All rights reserved.

关键词： Energy absorption

Recent progress in perovskite solar cells:from device to commercialization

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science China Chemistry 2022年第12期65卷 2369-2416页

作者： Xinhui Luo Xuesong Lin Feng Gao Yang Zhao Xiaodong Li Liqing Zhan Zexiong Qiu Jin Wang Cong Chen Lei Meng Xiaofeng Gao Yu Zhang Zijian Huang Rundong Fan Huifen Liu Yanrun Chen Xiaoxue Ren Jiahong Tang Chun-Hao Chen Dong Yang Yongguang Tu Xiao Liu Dongxue Liu Qing Zhao Jingbi You Junfeng Fang Yongzhen Wu Hongwei Han Xiaodan Zhang Dewei Zhao Fuzhi Huang Huanping Zhou Yongbo Yuan Qi Chen Zhaokui Wang Shengzhong(Frank)Liu Rui Zhu Jotaro Nakazaki Yongfang Li Liyuan Han State Key Laboratory of Metal Matrix Composites School of Material Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China State Key Lab for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of PhysicsPeking UniversityBeijing 100871China Key Laboratory of Semiconductor Materials Science Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China School of Physics and Electronic Science Engineering Research Center of Nanophotonics&Advanced InstrumentMinistry of EducationEast China Normal UniversityShanghai 200241China Key Laboratory for Advanced Materials and Institute of Fine Chemicals School of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Institute of Photoelectronic Thin Film Devices and Technology Renewable Energy Conversion and Storage CenterSolar Energy Research CenterNankai UniversityTianjin 300350China College of Materials Science and Engineering&Engineering Research Center of Alternative Energy Materials&Devices Ministry of EducationSichuan UniversityChengdu 610065China Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials Key Laboratory of Polymer Chemistry and Physics of Ministry of EducationSchool of Materials Science and EngineeringPeking UniversityBeijing 100871China School of Physics and Electronics Hunan Key Laboratory of Nanophotonics and DevicesCentral South UniversityChangsha 410083China Experimental Center for Advanced Materials School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Jia

Perovskite solar cells(PSCs) are undergoing rapid development and the power conversion efficiency reaches 25.7% which attracts increasing attention on their commercialization *** this review,we summarized the recent progress of PSCs based on device structures,perovskite-based tandem cells,large-area modules,stability,applications and ***,the challenges and perspectives are discussed,aiming at providing a thrust for the commercialization of PSCs in the near future.

关键词： perovskite solar cells device engineering stability application

Influence of Assembly Parameters on Tensile Behavior of Hybrid CMC and Superalloy Bolted Joints by Progressive Damage Analysis

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Journal of Harbin Institute of technology(New Series) 2021年第3期28卷 53-60页

作者： Chao Lv Feng Li Shuyuan Zhao Qian Sun Mingrui Li Xinyang Sun China Academy of Aerospace Aerodynamics Beijing 100074China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China Shenyang Aircraft Design and Research Institute Aviation Industry Corporation of ChinaShenyang 110000China School of Aeronautics and Astronautics Harbin Institute of TechnologyHarbin 150001China

With the considerable applications of ceramic matrix composites(CMC) in aircraft engineering, the design of CMC bolted joint gains paramount attention because of its capacity to to improve load-bearing efficiency of aircraft key structure. In this work, a 3 D finite element model was established to predict tensile performance and failure modes of single-lap, single-bolt 2 D C/SiC composite, and superalloy joint, which considers the progressive damage behavior of 2 D woven C/SiC composites. On the basis of the developed progressive damage model, a parametric study was carried out to illustrate the effects of bolt preload and bolt-hole clearance on mechanical behaviors of the hybrid bolted joint. It was found that the increase in the value of bolt preload made the failure load grow first and then drop, and the optimum value of bolt preload 5.00 kN generated 56.47% rise in the initial failure load and 22.83% rise in the final failure load for the bolted joint in comparison with zero preload case. As the clearance increased from 0 to 2.00%, the initial and final failure loads respectively declined by 45.88% and 24.02% for 2.00% bolt-hole clearance relative to the neat-fit case. The loss in failure loads can be reduced to compressive stress concentration around the fastening hole-edge area, leading to the appearance of earlier damages by the introduction of increasing bolt hole clearance.

关键词： ceramic matrix composite progressive damage analysis tensile performance bolt preload bolt-hole clearance

Investigation on Potential Barrier of Terminal Pinned Schottky Junction

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SSRN 2022年

作者： Zhang, Sen Liu, Kang Liu, Benjian Dai, Bing Zhang, Xiaohui Qiao, Pengfei Zhao, Jiwen Li, Yicun Hao, Xiaobin Yang, Lei Cao, Wenxin Han, Jiecai Zhu, Jiaqi National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China Key Laboratory of Micro-systems and Micro-structures Manufacturing Ministry of Education Harbin150080 China of unmanned Equipment & AI Zhongshan528400 China

The diamond Schottky theory needs to be further improved before exertising its full advantages, especially in terms of the physical properties of the diamond surface and the interface between metals and diamond. In our previous work, we experimentally verified that the oxygen terminal with a ketone bond introduces an acceptor surface state, 2.22 eV above valence band maximum (VBM), into bandgap at a diamond surface. Here, we further investigated the contact band diagram between metals (Au, Ag, Pt, W, and Pd) with different work function and oxygen terminated diamond using X-ray photoelectron spectroscopy. Results showed that the contact Fermi level was at 2.38 eV, 2.33 eV, 2.32 eV, 2.28 eV, and 2.29 eV above VBM, respectively. In addition, the similar symmetrical photocurrent-voltage characteristics under positive and negative bias were observed between Au-Ag and Ag-Pt electrodes deposited on the same oxygen terminated diamond plate. All the data above could be drawn a conclusion that the oxygen-terminal can pin the Schottky barrier height. We believe that the results obtained herein will help in the design and theoretical analysis of diamond Schottky devices. © 2022, The Authors. All rights reserved.

关键词： Oxygen

Anomalous thermal response of bulk diamond to uniaxial (100) strain: A first-principles prediction

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Physical Review B 2022年第18期106卷 184303-184303页

作者： Biao Wang Jiwen Zhao Yanwei Hu Yurong He Nikolay Rodionov Jiecai Han Jiaqi Zhu National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin 150080 China School of Energy Science & Engineering Harbin Institute of Technology Harbin 150001 China State Research Center of Russian Federation Troitsk Institute for Innovative and Fusion Research Troitsk Moscow 108840 Russia Key Laboratory of Micro-systems and Micro-structures Manufacturing Ministry of Education Harbin 150080 China

Diamond, a material that exhibits ultrahigh thermal conductivity with a sensitive thermal response to stress, is an ideal heat-sink material in the embedded cooling paradigm. This study uses first-principles calculations with the phonon Boltzmann transport equation to predict the variation rules of the thermal conductivity of diamond along the 〈100〉 crystal direction under strains at three orders of magnitude: 0.1%, 1%, and 10.5%. Density functional theory is used to predict the stress–strain dependence of diamond and the temperature-dependent thermal conductivity of unstrained diamond. The predictions are in good agreement with the experimental results. The calculated uniaxial strain–thermal conductivity dependence results reveal that the thermal conductivity of diamond abnormally increases by approximately 15% under small-scale uniaxial strain because of the weakened anharmonic interatomic force constants. Under large-scale strain, the thermal conductivity considerably decreases because of reduced phonon group velocities and increased numbers of phonon scattering channels. The findings in this study will guide analyses of the dependence of thermal conductivity on strain in other diamondlike structures, such as Group IV element-based materials. The abnormal thermal response at small strain is expected to lead to the realization of an artificial thermal conduction channel.

关键词： Thermal conductivity Diamond Boltzmann theory Density functional theory

Effects of Non-Uniform Needled Microstructure on Failure Mechanisms of 3d Needled C/C-Zrc-Sic composites Thick-Walled Cylinder Under Axial Compression and Internal Pressure

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SSRN 2022年

作者： Wang, Zhangwen Wang, Bing Jiang, Xinyu Wang, Xiaosong Sun, Wei Fang, Guodong Meng, Songhe Science and Technology on Advanced Composites in Special Environments Key Laboratory Harbin Institute of Technology Harbin150001 China National Key Laboratory of Precision Hot Processing of Metals Harbin Institute of Technology Harbin150001 China State Key Laboratory of Powder Metallurgy Central South University Changsha410083 China

Three dimensional (3D) needled ZrC-SiC modified C/C composites (C/C-ZrC-SiC composites) as cutting-edge materials for throat or expansion section of rocket nozzle are mainly subjected to complex loads conditions of internal pressure and axial force. The coupled axial compression and internal pressure experiments of 3D needled C/C-ZrC-SiC composites thick-walled cylinder were carried out to study the damage modes and failure mechanisms combing with the optical microscope and micro computed tomography (Micro-CT). A meso-macro finite element (FE) model considering local needling fiber regions was also established to investigate the failure process of the thick-walled cylinder under the complex loads. The predicted strength, failure strain and ultimate crack morphologies obtained by the proposed model were in good agreement with the experimental results. The effect of needled region distribution on the crack evolution and damage mechanisms was further analyzed. The non-uniform distribution of needled fiber region can induce the stress concentration of no needled regions under circumferential tension, which can trigger crack initiation and deflection. This study can be helpful of establishing the relationship between the structural behavior of ultra-high temperature ceramics modified C/C composites nozzle and the 3D needled composites design. © 2022, The Authors. All rights reserved.

关键词： Finite element method