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Bromine-Defect Induced High Sensitivity of Cs4pbbr6 Nanocrystals Humidity Sensor

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SSRN 2024年

关键词： Bromine compounds

A promising protective layer towards practical lithium metal batteries

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Science Bulletin 2022年第17期67卷 1732-1734页

作者： Wenyi Liu Jinping Liu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of ChemistryChemical Engineering and Life ScienceWuhan University of TechnologyWuhan 430070China State Center for International Cooperation on Designer Low-carbon&Environmental Materials School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China

Li metal batteries(LMBs)are regarded as promising future high-energy batteries,but their practical application under the conditions of high current density and large areal capacity is impeded by Li dendrite growth and low Coulombic efficiency(CE)[1–4].This is largely due to the structural heterogeneity and mechanical fragility of the native solid-electrolyte interphase(SEI)formed in situ on the Li metal surface,which cannot stabilize and protect the Li anode[5–7].

关键词： electrolyte anode 锂金属

Influence of Lattice Strain on the Mechanical Properties of Cosb3 Skutterudites

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SSRN 2023年

作者： Duan, Bo Li, Jialiang Zhang, Xiaolian Li, Guodong Ma, Yuxi Xu, Hao School of Civil Engineering & Architecture Wuhan Polytechnic University Wuhan430023 China Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics Wuhan University of Technology Wuhan430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

Elemental doping has been widely employed to manipulate the electrical and thermal transport properties of thermoelectric materials, without considering the influence to mechanical properties. In skutterudites, electronegative S-dopants have been found to reduce the lattice thermal conductivity. However, the effect of the covalent S-Sb bond on the mechanical properties of CoSb3 skutterudites remains unexplored. Compressive strength, in particular, exhibits a significant reduction in S-doped skutterudites, measuring only 249 MPa, representing a nearly 50% decrease compared to binary skutterudites. Additionally, there is a noticeable drop in the elastic, bulk and shear modulus. With molecular dynamics calculations, the shear strength of S-doped skutterudites also follows a sharp drop at a small ultimate strain. The evolutions of atomic configurations reveal that the lattice strain induced by S-dopants softens the Sb-Sb bond, ultimately leading to structure collapse under low shear stress conditions. These findings underscore the necessity for a comprehensive approach to elemental doping in thermoelectric community. © 2023, The Authors. All rights reserved.

关键词： Strain

Effect of Additive Content on Texture Evolution and Mechanical Properties of Si3N4 Ceramics Prepared by Hot Pressing

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SSRN 2023年

作者： Shi, Yunwei He, Qianglong Wang, Aiyang Ren, Yichao Wang, Jinghan Wang, Hao Wang, Weimin Fu, Zhengyi State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China Hubei Longzhong Laboratory Hubei Xiangyang441000 China

The purpose of this research is to investigate influence of additive content on sintering behavior, texture evolution and mechanical properties of Si3N4 ceramics systematically. Si3N4 ceramics with different additive contents are prepared by hot pressing at 1750 °C for 1h. XRD analysis confirms that the densification process is dominated by particle rearrangement instead of phase transformation. Grain morphology characterization demonstrates that additive content affects relative amount between textured [[EQUATION]]-Si3N4 grains and [[EQUATION]]-Si3N4 nuclei during initial sintering. During subsequent sintering, [[EQUATION]]-Si3N4 nuclei surrounded by residual liquid phase elongated randomly, and then weaken texture degree of Si3N4 ceramics. The texture degree of Si3N4 ceramics decreases first and then increases as additives increase steadily. Based on the CTE misfit model and the stochastic model of crack propagation, texture degree, residual stress and grain size have a synergistic effect on crack propagation behavior of [[EQUATION]]-Si3N4 ceramics. The outstanding flexural strength (1096 MPa) and fracture toughness (10.61 MPa[[EQUATION]]m1/2) is achieved in hot pressed SN21 with a relatively high texture degree (fL=0.213). © 2023, The Authors. All rights reserved.

关键词： Ductile fracture

The Combined Sol-Gel and Ascorbic Acid Reduction Strategy Enabling Ba2Co2Fe12O22 Hexaferrite/Graphene Composite with Enhanced Microwave Absorption Ability

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SSRN 2023年

作者： He, Yu Wang, Ruoqi Wu, Xiaohan Tang, Chuanhao Qian, Jun Zuo, Peiyuan Zhuang, Qixin Liu, Xing Key Laboratory of Special Functional Polymeric Materials and Related Technology Ministry of Education School of Materials Science and Engineering East China University of Science and Technology Shanghai200237 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China

Graphene featuring low density and high specific surface area, is highly suitable for loading ferrite nanoparticles. However, the current efficient reducing graphene method in fabricating ferrite/graphene composites require high temperatures/pressures, ae well as highly toxic and explosive reducing agents. We herein propose a strategy for synthesizing Ba2Co2Fe12O22 hexaferrite/graphene composite MAMs by mildly reducing graphene oxide using ascorbic acid. This method enables the reduced graphene oxide with comparable C/O ratios and conductivity comparing to that achieved by other reduction methods. The proper mass ratio of graphene oxide to ferrite particles (1:2) and optimized electromagnetic parameters endow the microwave absorbing materials with a minimum reflection loss value of approximately -45.25 dB and an effective bandwidth of around 4.75 GHz. The simulation calculations are further investigated to verify the practical application of this absorber. Accordingly, it is reasonable to conclude this study provides a new synthetic approach on advanced ferrite/graphene composite based MAMs. © 2023, The Authors. All rights reserved.

关键词： Iron compounds

Preparation and Investigation of Zro2-Based Thermal Control Coatings Doped with Mgo

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SSRN 2023年

作者： Zeng, Xian Wang, Youyuan Wang, Meng Wang, Zheng Long, Ziqiang Li, Bei Cao, Qian Cheng, Xudong School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China Research Center for Materials Genome Engineering Wuhan University of Technology Wuhan430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

In this study, MgO doped ZrO2 thermal control coatings were prepared using atmospheric plasma spraying technology. The phase composition, microstructure, optical properties of the coatings were characterized. The results showed that all the coatings possessed an obvious laminar structure. With the increase of MgO doping content, the chemicals of the coatings showed a trend of transition from monoclinic to cubic phase. Moreover, the solar absorptance (αs) effectively decreased, while the hemispherical emissivity (ΕH) increased. When the doping content reached 20 mol%, the ΕH/αs obtained a minimum value of 0.475, where the αs and ΕH was 0.399and 0.8395 correspondingly. Though the impurity levels introduced by the oxygen vacancies were beneficial to enhancing the intrinsic absorption in the 0.3~0.75 μm wave band, the decrease of free carrier concentration attenuated the free carrier absorption and weakened the emission property in the 0.75~7 μm wave band, resulting in a declining of αs. The enhancement of the hemispherical emissivity ΕH was attributed to the lattice distortion, which strengthen the radiation capability in the 7~25 μm wave band. © 2023, The Authors. All rights reserved.

关键词： Magnesia

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

Binary solvent engineering and CFPy/perovskite interface modification strategy in spray-coating for fabricating large-area high-quality hole transport layer

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materials Today Chemistry 2025年 46卷

作者： Zhao, Xin Ruan, Danlin Zhu, Mingwei Song, Jiawei Cheng, Jiahao Shen, Wenjian Li, Wangnan Liang, Guijie Liang, Ying Peng, Yong Li, Bin Cheng, Yi-Bing Hubei Xiangyang441000 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Machine X Technology Co. Ltd. Zhejiang 314211 China Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices Hubei University of Arts and Science Xiangyang441053 China State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals Lanzhou University of Technology Lanzhou730050 China

The high-quality and coverage of sprayed Spiro-OMeTAD layer on perovskite (PVSK) films is a significant challenge for the state-of-the-art perovskite solar cells (PSCs). In this work, the green mixed solvent system consisting of ethyl acetate (EA) and n-propyl acetate (NPA) was introduced to regulate the Spiro-OMeTAD solution properties. It was found that the rapid evaporation nature of EA/NPA mixed solvents significantly improves the coverage rate of sprayed Spiro-OMeTAD under ambient conditions. Besides, the introduction of 2-chloro-6-trifluoromethyl-3-aminopyridine (CFPy) further enhances the PVSK/Spiro-OMeTAD interface by improving the wettability of Spiro-OMeTAD solution on PVSK films, leading to a notable increase in Spiro-OMeTAD coverage by 39.5 %. With the increased coverage, the charge transport efficiency at PVSK/Spiro-OMeTAD interface was enhanced from 2.07 × 10−3 cm2 V−1 s−1 to 7.32 × 10−3 cm2 V−1 s−1. The CFPy was proved to reduce the migration rates of halide ions from the PVSK films to Spiro-OMeTAD layer, which can be attributed to the formation of hydrogen bonds between the –NH2 group in CFPy and free iodide (I−) and bromide (Br−) ions. Ultimately, it was confirmed that high-quality Spiro-OMeTAD films can be sprayed onto PVSK film under ambient conditions with this interface modification strategy. The PSCs fabricated using the evaporation-spraying technique achieved a power conversion efficiency (PCE) of 19.67 %. Under 1 sun AM 1.5G illumination at 26 °C and 30 %–40 % relative humidity (RH), the devices maintained 80 % of their initial efficiency after 500 h of continuous light exposure. Furthermore, a 10 × 10 cm2 sub-module (with an active area of 63 cm2) fabricated using this technique achieved a PCE of 15.54 %. © 2025 Elsevier Ltd

关键词： Cell engineering

In-situ ZrB2-hBN ceramics with high strength and low elasticity

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Journal of materials Science & technology 2020年第13期47卷 186-193页

作者： Ji Zou Guo-Jun Zhang Zheng-Yi Fu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China School of Metallurgy and Materials University of BirminghamB152TTBirminghamUK State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Institute of Functional MaterialsDonghua UniversityShanghai 201620China

ZrB2 ceramics with various hexagonal BN(hBN)additions up to 37 vol%were reactively densified by spark plasma sintering using powder mixtures containing ZrB2,ZrN and ***-boron based additives effectively promoted the densification process,ZrB2 ceramics reached>99%relative density at 2000℃and an applied pressure of 60 MPa with only 5 vol%in-situ formed hBN,whereas the relative density of pure ZrB2 was only 91.2%at the same *** thehBN contents,the morphology of hBN grains gradually changed from quasi-spherical to flake dominated,which has substantial influence on their mechanical ***-situ ZrB2-10 vol%hBN ceramics demonstrated high flexural strength of 597±22 MPa,relatively low Young’s modulus of 406 GPa and good machinability,especially for the impressively large strain to failure(1.47×10^-3)which is superior to most of their counterparts in the ZrB2 based particulate reinforced ceramics.

关键词： ZrB2 Reactive sintering Spark plasma sintering Boron nitride containing ceramics Mechanical property