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Journal of Wuhan University of technology(materials Science) 2019年第5期34卷 1220-1227页

作者： WU Jiansheng XIAO Shengqiang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Two novel non-fullerene small molecule acceptors were prepared with the conjugated backbone of 5 H-fluoreno[3, 2-b:6, 7-b’] dithiophene carrying the electron deficient unit of dicyanomethylene indanone(DICTFDT) and rhodanine(TFDTBR), respectively. The two acceptors exhibited excellent thermal stability and strong absorption in the visible region. The LUMO level is estimated to be at-3.89 eV for DICTFDT and-3.77 eV for TFDTBR. When utilized as the acceptor in bulk heterojunction polymer solar cells with the polymer donor of PBT7-Th, the optimized maximum power conversion efficiency of 5.12% and 3.95% was obtained for the device with DICTFDT and TFDTBR, respectively. The research demonstrates that 5 H-fluoreno[3, 2-b:6, 7-b’] dithiophene can be an appealing candidate for constructing small molecular electron acceptor towards efficient polymer:non-fullerene bulk heterojunction solar cells.

关键词： polymer solar cells bulk heterojunction non-fullerene acceptor

Defect and Doping Co‑Engineered Non‑Metal Nanocarbon ORR Electrocatalyst

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Nano-Micro Letters 2021年第4期13卷 178-207页

作者： Jian Zhang Jingjing Zhang Feng He Yijun Chen Jiawei Zhu Deli Wang Shichun Mu Hui Ying Yang Key Laboratory of Material Chemistry for Energy Conversion and Storage Ministry of EducationSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China Pillar of Engineering Product Development Singapore University of Technology and Design8 Somapah RoadSingapore 487372Singapore State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070People’s Republic of China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen ValleyFoshan 528200People’s Republic of China

Exploring low-cost and earth-abundant oxygen reduction reaction(ORR)electrocatalyst is essential for fuel cells and metal–air *** them,non-metal nanocarbon with multiple advantages of low cost,abundance,high conductivity,good durability,and competitive activity has attracted intense interest in recent *** enhanced ORR activities of the nanocarbons are normally thought to originate from heteroatom(e.g.,N,B,P,or S)doping or various induced ***,in practice,carbon-based materials usually contain both dopants and *** this regard,in terms of the co-engineering of heteroatom doping and defect inducing,we present an overview of recent advances in developing non-metal carbon-based electrocatalysts for the *** characteristics,ORR performance,and the related mechanism of these functionalized nanocarbons by heteroatom doping,defect inducing,and in particular their synergistic promotion effect are emphatically analyzed and ***,the current issues and perspectives in developing carbon-based electrocatalysts from both of heteroatom doping and defect engineering are *** review will be beneficial for the rational design and manufacturing of highly efficient carbon-based materials for electrocatalysis.

关键词： Defect Doping Electrocatalyst Oxygen reduction reaction Non-metal nanocarbon

Enhanced the Impact Resistance by Gradient Face-Sheet Design of a Sandwich Structure

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SSRN 2023年

作者： Wei, Jing Luo, Guoqiang Liu, Ao Wei, Qinqin Xia, Zhilin Zhang, Ruizhi Shen, Qiang State Key Lab 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 National Key Laboratory of Shock Wave and Detonation Physics Institute of Fluid Physics China Academy of Engineering Physics Mianyang621900 China

Sandwich structure has been designed to reduce the impact damage of the stress waves. However, the existing work focuses on the optimization of sandwich cores while the important face-sheet structure is seldom improved. Here, we used the impedance matching theory to design a negative gradient face-sheet sandwich structure with excellent stress wave attenuation performance. Owing to stress wave attenuation form a high impedance to a low one, the negative gradient face-sheet sandwich structure shows a low peak stress of 5.51 MPa, and the average transmission peak stress is 2.69 MPa. The gradient face-sheet structure changes the compressive deformation behavior;thus, the energy absorption performance of the negative gradient face-sheet sandwich structure increases to be 1311.8 KJ/m3 and the specific energy absorption reaches 1072 J/kg. Finite-element methods further demonstrate the overall sandwich structures can be enhanced through alleviating the failure of sandwich core by a gradient face-sheet structure. This work provides a paradigm for the design of sandwich structures with high energy absorption performance. © 2023, The Authors. All rights reserved.

关键词： Energy absorption

Synergistic Strengthening of Al Matrix Composites by in Situ Pyrolysis of C and Precipitation of Nanophases

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SSRN 2023年

作者： Sun, Yi Li, Junguo Yang, Xuebin Li, Peibo Zhang, Yang Luo, Guoqiang Shen, Qiang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory Chaozhou521000 China Hubei Longzhong Laboratory Hubei Xiangyang441000 China

This study focuses on addressing the dispersibility issue of carbides in Al matrix composites through the in-situ pyrolysis of polymers. Furthermore, the addition of Ag enables Ag-C synergistic reinforcement of Al matrix composites, offering a novel reinforcement approach for Al matrix composites. The Al-16Ag-C composite is fabricated through the in-situ pyrolysis of PVB (Polyvinyl Butyral) followed by hot pressing sintering. Subsequently, the effect of temperature on the microstructural evolution and mechanical properties of the composite is investigated. The underlying strengthening mechanisms are also examined and discussed. Microstructural characterization demonstrates the formation of two alloy phases, namely Ag2Al and Al4C3, within the Al-16Ag-C composite. The formation of Al4C3 is dependent on the temperature utilized during sintering. The alloy phases, distributed at the grain boundaries, enhance the material’s strength by impeding dislocation motion, increasing dislocation density within the matrix, and limiting grain growth. The Al-16Ag-C composite, sintered at 630 °C, exhibits a remarkable ultimate tensile strength of 481 MPa and an elongation of 22.25%, representing a significant enhancement compared to pure aluminum. © 2023, The Authors. All rights reserved.

关键词： Binary alloys

Amino-Functionalized and Na+ Pre-Intercalated Three Dimensional Ti3c2tx Film Aerogel with Excellent Electrochemical Performances for Supercapacitor

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SSRN 2024年

作者： Guo, Xiaohui Jin, Xinhui Mo, Dejie Feng, Lirong Wang, Dong Su, Baolian Key Lab of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education The College of Chemistry and Materials Science Northwest University Xi’an710069 China Department of inorganic chemistry University of Namur 61 rue de Bruxelles NamurB-5000 Belgium Xinjiang University China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing China

Precise modulation of the pore structure and modification of the surface groups (-NH2) of MXene aerogels by the solid foaming method in combination with Na+ pre-intercalation can significantly increase the layer spacing and change the electronic structure of MXene, thereby significantly optimizing its electrochemical performance. The three dimensional (3D) network structure provides numerous active sites on the surface of MXene and provides more ion transfer pathways, and the large layer spacing allows electrolyte ions fast transport, and the surface groups provide more active sites for the pseudocapacitive reaction. As a result, the prepared Na-Ti3C2Tx film aerogel delivers a high mass specific capacity of 560 F g-1 and excellent cycling performance of 94.5% capacity retention after 12,000 cycles in 0.5 M H2SO4. In addition, the flexible all-solid-state supercapacitor (ASC) composed of MXene film electrodes has excellent specific capacitance ~ 277 F g-1 and high energy density ~ 52.8 Wh kg-1 at 1600 W kg-1. Therefore, this work not only proposes a feasible synthetic method that can precisely regulate the pore structure and surface features of film aerogels, but also demonstrates the broad application prospects of aerogel materials in wearable power devices. © 2024, The Authors. All rights reserved.

关键词： Supercapacitor

Comprehensive Performance Evaluation of Air-Assisted Atomization Humidification for High-Power Fuel Cell Systems

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SSRN 2024年

作者： Huang, Yiyuan Luo, Maji Jiang, Kun Wang, Chuan Tu, Faping Huang, Miaohua School of Automotive Engineering Wuhan University of Technology Wuhan430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Luoshi Road 122# Wuhan430070 China Wuhan HydraV Fuel Cell Tech Co. Ltd. Hubei 430090 China

Membrane humidification is the most prevalent method used to humidify the fuel cell system of commercial vehicles. However, this passive approach meets only the humidity requirements. In order to simultaneously address the issues of humidification and cooling associated with high-power fuel cell systems，air-assisted atomization humidification (AAAH) is proposed as an active technology. However, there are not enough experiments to analyze the adaptation of AAAH. In this study, the sensitivity of AAAH is evaluated under high-power load conditions and then compared with that of membrane humidification (MH) under various operating scenarios. Experimental results show a positive correlation between the relative humidity of inlet air and the pressure of spray with AAAH. Moreover, this technology achieves higher relative humidity of inlet air and water recovery rate than those obtained by MH, enhancing the stack performance and system efficiency and reducing system thermal load. At the rated current of 540A, the system efficiency can reach up to 44.8%, reducing the thermal load ratio to 87.4%. Although the humidity fluctuates in the range of 26.3% to 53.2% under variable load conditions, with a response time of 41 seconds, which is longer than that of MH, the fluctuations are within an acceptable limit considering the stack performance. Finally, a control strategy based on the proportion of liquid water is applied to satisfy the self-circulation of humidified water. © 2024, The Authors. All rights reserved.

关键词： Thermal load

Chemical adsorption on 2D dielectric nanosheets for matrix free nanocomposites with ultrahigh electrical energy storage

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Science Bulletin 2022年第6期67卷 609-618,M0004页

作者： Jie Chen Zhonghui Shen Qi Kang Xiaoshi Qian Shengtao Li Pingkai Jiang Xingyi Huang Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing Department of Polymer Science and EngineeringThe State Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and DevicesWuhan University of TechnologyWuhan 430070China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong UniversityXi'an 710054China

Relaxor ferroelectric polymers display great potential in capacitor dielectric applications because of their excellent flexibility,light weight,and high dielectric ***,their electrical energy storage capacity is limited by their high conduction losses and low dielectric strength,which primarily originates from the impact-ionization-induced electron multiplication,low mechanical modulus,and low thermal conductivity of the dielectric *** a matrix free strategy is developed to effectively suppress electron multiplication effects and to enhance mechanical modulus and thermal conductivity of a dielectric polymer,which involves the chemical adsorption of an electron barrier layer on boron nitride nanosheet surfaces by chemically adsorbing an amino-containing polymer.A dramatic decrease of leakage current(from 2.4×10^(-6)to 1.1×10^(-7)A cm^(-2)at 100 MV m^(-1))and a substantial increase of breakdown strength(from 340 to 742 MV m^(-1))were achieved in the nanocompostes,which result in a remarkable increase of discharge energy density(from 5.2 to 31.8 J cm^(-3)).Moreover,the dielectric strength of the nanocomposites suffering an electrical breakdown could be restored to 88%of the original *** study demonstrates a rational design for fabricating dielectric polymer nanocomposites with greatly enhanced electric energy storage capacity.

关键词： Boron nitride nanosheets Electron barrier layer Relaxor ferroelectric polymers Nanocomposites Electrical energy storage

The Enhanced Cohesive Performance of Magnetron Sputtered Cr Coatings on Steel Substrate via Controlling Columnar Grain Structures

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SSRN 2024年

作者： Liu, Wenxin Xu, Zhigang Geng, Xuehao Liu, Long Peng, Jian Shen, Qiang Wang, Chuanbin State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Chaozhou Branch Chemistry and Chemical Engineering Guangdong Laboratory Chaozhou521000 China Inner Mongolia North Heavy Industries Group Limited Company Nanjing Institute Nanjing210049 China

Enhancing the cohesion of Cr coatings is essential for preventing cracking and prolonging their durability in service. This study focuses on investigating the impact of columnar grain structures on the cohesive strength of the Cr coating on steel substrate. The systematic variation in deposition time during the magnetron sputtering process significantly affected the columnar grain structures, surface roughness, residual stress, and cohesive strength of Cr coatings. The results revealed that all Cr coatings exhibited preferred orientations along the (211) plane. As the deposition time increased from 1 to 4 h, the columnar grain size and surface roughness of Cr coatings progressively increased, while the residual compressive stress demonstrated a gradual decline. The cohesion strengths of the coating initially rose and then declined. Notably, the columnar grain size of approximately 700 nm achieved the best cohesion for Cr coatings on stainless steel, attributed to the combined effects of residual stress and surface roughness. This study underscores the significance of adjusting coating columnar grain structures to improve cohesion and offers valuable insights for the development of advanced hard coatings. © 2024, The Authors. All rights reserved.

关键词： Surface roughness

Effect of calcination temperatures on photocatalytic H_(2)O_(2)-production activity of ZnO nanorods

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Chinese Journal of Catalysis 2022年第2期43卷 226-233页

作者： Zicong Jiang Yong Zhang Liuyang Zhang Bei Cheng Linxi Wang 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 College of Chemistry and Chemical Engineering Hubei Polytechnic UniversityHuangshi435003HubeiChina Laboratory of Solar Fuel Faculty of Materials Science and ChemistryChina University of GeosciencesWuhan 430074HubeiChina

Photocatalytic hydrogen peroxide(H_(2)O_(2))production from O_(2) and H2O is an ideal process for solar‐to‐chemical energy ***,ZnO nanorods are prepared via a simple hydrothermal method for photocatalytic H_(2)O_(2) *** ZnO nanorods exhibit varied performance with different calcination *** from calcination,the separation efficiency of photo‐induced carriers is significantly improved,leading to the superior photocatalytic activity for H_(2)O_(2) *** H_(2)O_(2) produced by ZnO calcined at 300℃ is 285μmol L^(−1),which is over 5 times larger than that produced by untreated *** work provides an insight into photocatalytic H2O2 production mechanism by ZnO nanorods,and presents a promising strategy to H2O2 production.

关键词： Photocatalysis Hydrogen peroxide production ZnO nanorod Calcination temperature Oxygen reduction

Ultraviolet and Thermal Dual-Curing Assisted Extrusion-Based Additive Manufacturing of Lunar Regolith Simulant for In-Site Construction on the Moon

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SSRN 2023年

作者： Cui, Qianshun Wang, Tongcai Gu, Guangshuai Zhang, Rihan Zhao, Tingting Huang, Zhifeng Wang, Gong Chen, Fei Technology and Engineering Center of Space Utilization Chinese Academy of Sciences Beijing100094 China University of Chinese Academy of Sciences Beijing100049 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China

The establishment of a lunar base is crucial for lunar studies, resource extraction, and advancement in deep space exploration. Considering the limitations of rocket capacity and Earth-Moon transportation costs, lunar regolith is regarded as the most practical material for lunar base construction. Consequently, the in-situ additive manufacturing technology for simulated lunar regolith has been widely studied in recent years. This paper proposes a novel additive manufacturing approach for lunar regolith simulants. The simulants and several resins were mixed into a high-solid-loading paste, which was suitable for extrusion-based additive manufacturing process. To fully leverage the lunar environment, the feasibility of the ultraviolet (UV) and thermal curing of the resins was first verified, which was followed by the validation of the lunar regolith paste with the solid content of 86 wt.%. After the characterization of the ultraviolet and heat curing properties, the paste was further 3D printed via the extrusion-based device. The extruded paste underwent preliminary curing in a UV environment and was then heated to approximate the daytime lunar conditions, achieving complete curing of the printed component. The cured parts exhibited a compressive strength of 9.83 ± 1.07 MPa, meeting the requirements for infrastructure construction in the low-gravity lunar environment. This work offers significant implications for future in-situ construction on the Moon using extrusion-based lunar regolith additive manufacturing. © 2023, The Authors. All rights reserved.

关键词： 3D printing