检索结果-内蒙古大学图书馆

SSRN 2022年

作者： Kang, Kejia Wang, Xiao Zhou, Weibing Li, Peibo Huang, Zihao Luo, Guoqiang Shen, Qiang Zhang, Lianmeng School of Electromechanical Engineering Henan University of Technology Zhengzhou450001 China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory Hanjiang Laboratory Chaozhou521000 China State Key Lab of Silicate Materials for Architecture Wuhan University of Technology Wuhan430070 China National United Engineering Laboratory for Advanced Bearing Tribology Henan University of Science and Technology Luoyang471000 China

To develop materials with promising utilization future in the extreme environments of aerospace, the MoNbTa(WC) x composites were prepared by vacuum arc melting, of which the crystal structure, microstructure, and compression properties at elevated temperature were investigated. The MoNbTa(WC) x composites had eutectic structures that consisted of body-centered cubic (BCC) phase and eutectoid structures. The lamellar fine eutectoid structures were composed of BCC structured high entropy alloy (HEA) Mo-Nb-Ta-W and FCC structured carbide Mo-Nb-Ta-W-C. It was demonstrated that the ductility and elevated temperature strength was enhanced simultaneously combined with the effect of eutectic structures and WC addition. The optimal true yield strength and true fracture strain reached 1205 MPa and 29.2% in MoNbTa(WC) 0.9 at 1200 ℃, meanwhile, the fracture strain at ambient temperature was 13.96%. Distinct strain hardening was observed at the initial deformation stage of MoNbTa(WC) 0.9 at 1200 ℃. The compression performances of MoNbTa(WC) x were superior in comparison with most refractory high entropy alloys. © 2022, The Authors. All rights reserved.

关键词： Eutectics

来源：评论

学校读者我要写书评

暂无评论

Defect Control Based on Interfacial Passivation Via Post-Treatment of 1-Ethylpyridine Hydrobromide for Achieving Efficient and Stable Perovskite Solar Cells

SSRN

引用

SSRN 2022年

作者： Xia, Tian Jiang, Bo Liu, Weiting Li, Xingyu Dong, Haiyue Tian, Nan Zheng, Guoyuan Peng, Yong Yao, Disheng Long, Fei School of Materials Science and Engineering Guilin University of Technology Guilin541004 China Guangxi Key Laboratory of Optical and Electronic Materials and Devices School of Materials Science and Engineering Guilin University of Technology 12 Jiangan Road Guilin541004 China Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources Guilin University of Technology Guilin541004 China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

The carrier recombination caused by a series of crystal defects in perovskite materials is still the main obstacle to further improve the photoelectric conversion efficiency. Herein, as an agent for interfacial engineering, 1-ethylpyridine hydrobromide (EPB) was employed to treat the FA1-xMAxPbI3-yBry perovskite film using a two-step sequential deposition method. The influence and mechanism of the post-treatment with EPB on the film properties and photovoltaic performance of the relevant perovskite solar cells (PSCs) were studied. The champion EPB-treated perovskite solar cell achieved a remarkable power conversion efficiency (PCE) of 20.71% with an enhanced short current density (Jsc) of 24.14 mA cm-2, which is higher than that (PCE=18.85%, Jsc=23.40 mA cm-2) of the pristine device without EPB. The nitrogen (N) atom in EPB exhibits a strong coordination with lead (Pb) from the perovskite, which reduces defect density and suppresses non-radiative recombination for achieving high-performance PSCs. The UV-vis and UPS results reveal that the effective passivation effect of EPB significantly eliminates the interfacial barrier that inhibits charge transport and improve operational stability of PSCs. As a result, The PCE of the EPB-treated device remains more than 90% of the initial efficiency after 400 hours of unpackaged and about 40% ambient humidity. © 2022, The Authors. All rights reserved.

关键词： Perovskite solar cells

来源：评论

学校读者我要写书评

暂无评论

Hydroxylated high-entropy alloy as highly efficient catalyst for electrochemical oxygen evolution reaction

引用

Science China materials 2020年第12期63卷 2613-2619页

作者： Peiyan Ma Shichao Zhang Mutian Zhang Junfeng Gu Long Zhang Yuchen Sun Wei Ji Zhengyi Fu School of Chemistry Chemical Engineering and Life ScienceWuhan University of TechnologyWuhan 430070China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Oxygen evolution reaction(OER),a half reaction involved in electrochemical water splitting,CO2 reduction,and metal–air batteries,restricts the efficiency of these energy conversion systems due to sluggish reaction kinetics[1,2].To accelerate OER,highly efficient electrocatalysts are ***,large-scale applications of the normally used OER catalysts(***2 and IrO2)are hampered by their instability and low *** is highly desirable to develop earth-abundant catalysts with low cost,high activity and long-term ***(Ni,Fe)(oxy)hydroxides(Co(Ni)-(O)OH)have emerged as promising OER catalysts in recent years[3].

关键词： Tafel斜率高熵合金电催化剂电化学活性羟基化超电势电化学活化高效催化剂

来源：评论

学校读者我要写书评

暂无评论

Highly sensitive strain sensor from topological-structure modulated dielectric elastic nanocomposites

arXiv

引用

arXiv 2021年

作者： Fan, Youjun Shen, Zhonghui Zhou, Xinchen Dan, Zhenkang Zhou, Le Ren, Weibin Tang, Tongxiang Bao, Shanyong Nan, Cewen Shen, Yang State Key Lab of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing100084 China Center for Flexible Electronics Technology Tsinghua University Beijing100084 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and Devices Wuhan University of Technology Wuhan430070 China

Flexible strain sensors are critical to several potential intelligent applications, such as human-machine interfaces, soft robotics, human motion detection, and safety monitoring of components. Stretchable functional materials are important components of strain sensors, and they are still major challenges for high performance strain sensors. Herein, we demonstrate a novel strategy of designing and optimizing flexible strain sensor by developing topological structure modulated high permittivity elastic nanocomposite. The topological structure with three-phase percolative nano-nanonetworks produces synergistic effects of space charge enhancement and local electric field modulation, and it gives rise to an ultrahigh dielectric permittivity (113.4, at 1 kHz, over 1500% enhancement than that of commercial elastic polyurethane matrix) and excellent comprehensive electromechanical performance, and the optimal comprehensive electromechanical performance reaches to 542.91 MPa-1, which is over 9-fold than that of commercial polyurethane elastic film. An interdigital capacitive strain sensor is designed using the topological structured elastic dielectric nanocomposite. It possesses high initial capacitance density and positive capacitance response with stain, achieving high signal-to-noise ratio, high capacitance response sensitivity, and wide linear range, and it breaks through disadvantages of negative sensitivity and narrow linear range for conventional interdigital strain sensors. The prepared integrated strain sensor arrays are able to measure local strain of convoluted surfaces and monitor the motion of soft actuators in real time, and they would make conditions for intelligent control systems and the study of morphological intelligence. Copyright © 2021, The Authors. All rights reserved.

关键词： Nanocomposites

来源：评论

学校读者我要写书评

暂无评论

Bifunctional Dimethyldichlorosilane Assisted Air-Processed Perovskite Solar Cell with Enhanced Stability and Low Voltage Loss

SSRN

引用

SSRN 2022年

作者： Zhou, Peng Lu, Shaojuan Mo, Yanping Cheng, Jiahao Jiao, Chuanjia Zhang, Xiao-Li Li, Wangnan Liang, Guijie Wang, Jingyang Huang, Fuzhi Cheng, Yi-Bing State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Hubei Institute of Aerospace Chemotechnology Xiangyang441003 China Hubei key Laboratory of Low Dimensional Optoelectronic Materials and Devices Hubei University of Arts and Science Xiangyang441053 China School of Materials Science and Engineering Zhengzhou University Henan Province 450001 China Hubei Longzhong Laboratory Xiangyang441000 China Solar Hydrogen Production Lab Foshan Xianhu Laboratory of the Advanced Energy Science Technology Guangdong Laboratory Foshan China

Perovskite solar cells (PSCs) attract great interest due to high-efficiency and low-cost. However, perovskite materials are sensitive to moisture, causing it cannot be prepared in air, which increase the manufactory cost. To address it, we employ dimethyldichlorosilane (DMDCS) to passivate the grain boundaries and surfaces of MAPbI3 perovskite films, thus inhibiting the erosion of water. Then the preparation of highly efficient PSCs in air atmosphere is realized. The passivation mechanism of DMDCS on the perovskite film and interface is analyzed via investigating photo-excited carrier mobility and ultrafast transient adsorption spectroscopy (TAS). The results of TAS exhibit an improvement of charge carrier diffusion with an enhanced lifetime from 7.62 ps to 11.22 ps by the precursor doping. The charge carrier extraction at the interface is also greatly promoted with the decreased decay time from 0.29 ns to 0.16 ns by surface passivation, consistent well with the carrier mobility via space charge limited current (SCLC). The modified devices demonstrate an excellent efficiency of 20.69%, with a fill factor exceeding 80%. The optimized devices exhibit an excellent long-term environmental stability, retaining more than 80% of the initial efficiency after 1000 h in ambient with a relative humidity of 40 RH % without encapsulation. © 2022, The Authors. All rights reserved.

关键词： Perovskite solar cells

来源：评论

学校读者我要写书评

暂无评论

The influence of cooling rates on strain phase diagrams and domain structures of ferroelectric thin films: A case study of PbTiO 3

引用

Acta Materialia 2025年 296卷

作者： Meng-Jun Zhou Peng Zhang Bo Wang Di Yi Ce-Wen Nan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and Devices School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China Materials Science Division Lawrence Livermore National Laboratory Livermore CA 94550 USA School of Materials Science and Engineering State Key Lab of New Ceramics and Fine Processing Tsinghua University Beijing 100084 China

Strain engineering has been established as an effective approach to control phase equilibria, domain configurations, and functional properties of ferroelectric thin films. Temperature-strain phase diagrams have been used as powerful tools for providing insights into strain engineering. However, almost all existing phase diagrams established using the phase-field approach assume quenching conditions without considering actual cooling rates during the post-deposition annealing process of ferroelectric thin films. Within this work, we systematically investigate the influence of cooling rates on domain structures and the strain-phase diagram of ferroelectric thin films using phase-field simulations, taking PbTiO 3 thin films as a model system. We found that both the position of phase boundaries in the strain phase diagrams and the domain morphology are significantly influenced by the cooling rates. It is revealed that while the paraelectric-ferroelectric phase boundary remains invariant, the phase boundaries between single-phase and multi-phase regions tend to shift toward the corresponding multi-phase region as the cool rate reduces. Slow cooling generally leads to more ordered domain structures with increased domain size. Using the obtained equilibrium domain structures, we calculated effective thermal conductivities and found significant variations that can be tuned by the cooling rates. This work reveals an underexplored yet critical impact of cooling rates on phase equilibria and domain structures in ferroelectric thin films, which may inspire further fine-tuning of domains and domain walls in low-dimensional ferroelectrics for multifunctional applications.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Microwave plasma etching of SS304 substrates for improved PVD coating adhesion

引用

Applied Surface Science 2025年 708卷

作者： Wenxin Liu Zhigang Xu Jian Peng Chuanbin Wang Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory Chaozhou 521000 PR China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 PR China Hubei Technology Innovation Center for Advanced Composites Wuhan University of Technology Wuhan 430070 Hubei PR China

Fabricating microstructures on a substrate surface enhances surface roughness, improving the adhesion of physical vapor deposition (PVD) coatings. Currently, plasma etching is widely used to improve substrate surface roughness. However, it suffers from limitations such as low etching efficiency and substrate damage. This study explores microwave plasma etching as an innovative approach to enhance surface roughness, combined with magnetron sputtering to improve coating adhesion. The effects of etching time on substrate morphology, roughness, and wettability are systematically analyzed, along with their influence on chromium (Cr) coating properties. Results show that microwave plasma etching increases surface roughness and wettability without altering the substrate’s phase structure. The crystallographic orientation of Cr coatings is less affected by the substrate surface roughness. Indentation and scratch tests are conducted to evaluate the adhesion strength under dynamic and static conditions. When the etching time is 2 h and the substrate surface roughness is 10.5 nm, the adhesion strength between the coating and the substrate reaches a maximum of 42.7 N, which is nearly a 100 % improvement compared to the adhesion strength of the polished substrate. This study demonstrates an effective method for improving substrate roughness and provides insights into enhancing the coating adhesion.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Intercalation Engineering of Nickle-Cobalt-Layered Double Hydroxide for Long-Lifespan Supercapacitor

SSRN

引用

SSRN 2023年

作者： Hu, Wenxuan Chen, Lu Geng, Biao Song, Yihu Wu, Ziliang Zheng, Qiang Shan, Gurong Du, Miao MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou310058 China Zhejiang Provincial Key Lab for Chemical and Biological Processing Technology of Farm Product School of Biological and Chemical Engineering Zhejiang University of Science and Technology Hangzhou310023 China State Key Laboratory of Chemical Engineering College of Chemical and Biological Engineering Zhejiang University Hangzhou310058 China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan030000 China

Layered double hydroxides (LDHs), a class of 2D lamellar intercalating materials, is a promising candidate for high-performance supercapacitors, while its poor cycling stability has always been its Achille’s heel. Although doping metal ions into the host layer is proved to be an effective way to improve the weakness, the effects of intercalated anions on cycling performance have been rarely studied and highly underestimated. In this paper, we prepared a group of NiCo-LDHs with different intercalated anions, including NO3-, Cl-, SO42-, MoO42- and WO42-, which expand the interlayer spacing from 0.73 to 1.07 nm. Interestingly, although expanding the interlayer spacing could increase the specific capacity by providing more electrochemical active sites, it could not guarantee the improvement in cycling performance and rate capability. The correlation between interlayer spacing and cycling performance exhibits a "volcano" plot. The MoO42- intercalated NiCo-LDH with a 0.96 nm interlayer spacing delivers a high specific capacity of 795 C g-1 and the best cycling stability with 80% capacity retention after 20000 cycles, which is better than NiCo-LDH-NO3 (0.73 nm, 50% after 3000 cycles) and NiCo-LDH-WO4 (1.07 nm, 64% after 20000 cycles). By combining the results with the DFT method, the effects of intercalated anion on cycling performance are illustrated. In addition, the asymmetric supercapacitor also exhibits an excellent cycling stability with ~100% capacity retention after 10000 cycles. This study provides new insight to the compositional design of LDH-based electrodes for long-lifespan supercapacitors. © 2023, The Authors. All rights reserved.

关键词： Cobalt compounds

来源：评论

学校读者我要写书评

暂无评论

A C156 Molecular Nanocarbon: Planar/Rippled Nanosheets Hybridization

引用

Angewandte Chemie 2024年第6期137卷

作者： Ruihua Fu Xingyu Chen Fei Qiu Xinyue Liu Prof. Jianlong Xia Prof. Lei Zhang Beijing Advanced Innovation Center for Soft Matter Science and Engineering State Key Lab of Organic-Inorganic Composites Beijing University of Chemical Technology 100029 Beijing P. R. China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and Devices Wuhan University of Technology 430070 Wuhan P. R. China

A novel hybrid nanocarbon consisting of one rippled and two planar nanosheets has been synthesized and characterized. Two meso pairs of [5]helicenes are formed along the long molecular axis of the hybrid to connect rippled and planar subunits, leading to a stable conformation. It is shown that the hybrid possesses the individual electronic properties of the rippled and planar subunits. Compared to the rippled subunit, such hybrid has a better geometric match to C 60 and complexes with C 60 in a 1 : 1 stoichiometry, with the association constant on the order of 10 5 M −1 . The hybrid displays unusual anti -Kasha fluorescence emission. The transient absorption spectroscopy revealed that the singlet fission (SF) from higher level singlet excited states (S n ) is operative in the film of the hybrid.

关键词： nanocarbon hybridization nanosheet supramolecular complexation transient absorption

来源：评论

学校读者我要写书评

暂无评论

Research on the stability of organic/inorganic hybrid perovskite materials for IEC61215 purpose

Research on the stability of organic/inorganic hybrid perovs...

引用

第六届新型太阳能电池材料科学与技术学术研讨会

作者： Jiang He Zhiliang Ku Yong Peng State key lab of advanced technology for materials synthesis and processing Wuhan University of Technology

Organi/Inorganic perovskite materials behavior differently under a testing condition of IEC61215. In this research, the behavior of series of perovskite materials with varied A cations under the thermal cycling testing standards were studied. We analyzed the defeating mechanisms of those materials through temperature depended XRD, SEM and AFM ***. Finally, we draw a conclusion that FACsPb（I/Br） perovskite materials could the most stable one under thermal cycling testing condition. This perovskite materials can be stable because the phase change related materials decomposition under frequent temperature change does not happen in this material, however other perovskite materials will decompose. A device with an architecture of FTO/TiO/FACsPbI/graphite electrode was then encapsulated and tested under a condition of -30℃-85℃ for 200 times. After testing, the device finally kept about 83% of its initial power conversion efficiency.

关键词： Standard stability tests Perovskite solar cells thermal cycling tests

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：