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Activating lattice oxygen of two-dimensional MnXn-1O2 MXenes via zero-dimensional graphene quantum dots for water oxidation

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Science China materials 2022年第11期65卷 3053-3061页

作者： Yiyuan Ma Yurong An Zhuo Xu Laifei Cheng Wenyu Yuan Science and Technology on Thermostructural Composite Materials Laboratory School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China State Key Laboratory of Solidification Processing School of Material Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy TechnologyInstitute for Advanced Energy MaterialsSchool of Materials Science and EngineeringShaanxi Normal UniversityXi’an 710119China Key Laboratory of Macromolecular Science of Shaanxi Province Key Laboratory of Applied Surface and Colloid ChemistrySchool of Chemistry&Chemical EngineeringShaanxi Normal UniversityXi’an 710062China

The poor oxygen evolution reaction(OER)activity of two-dimensional(2 D)transition metal carbides(MXenes)is a major obstacle to their application in highperformance water splitting and fuel cells due to the high energy barriers for the absorption of ***,we demonstrate that the lattice oxygen of M_(n)X_(n-1)O_(2)MXenes can be activated by 0 D graphene quantum dots(GQDs),thereby activating the OER via the lattice-oxygen oxidation mechanism(LOM)instead of the conventional adsorbate evolving *** pH-dependent OER activity of M_(n)X_(n-1)O_(2)@GQDs and ^(18)O isotope-lab.lling experiments with time-of-flight secondary-ion mass spectrometry(TOF-SIMS)provide the direct evidence of ***,the activated lattice oxygen amount can be controlled by the *** as-prepared 0 D/2 D Ti_(3)C_(2)O_(2)@GQDs heterostructure delivers a highly reduced overpotential of 390 mV(bare Ti_(3)C_(2)O_(2):530 mV)at a benchmark current density of 10 mA cm^(-2).Through optimizing the thickness and the additional conductive substrate,the overpotential at 10 mA cm^(-2)decreases to 250 mV,while the Tafel slope is reduced to 39 mV dec^(-1);these values indicate the as-prepared heterostructure is superior to the state-of-the-art MXene-based OER *** work provides a new strategy to enhance the OER activity of M_(n)X_(n-1)O_(2)and extends the application of LOM from perovskite to MXenes.

关键词： graphene quantum dots lattice-oxygen activation oxygen evolution reaction water splitting heterostructure

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Effect of pH, milling time, and Isobam content on porous silicon nitride ceramics prepared by gel casting

Advanced Powder Materials

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advanced Powder materials 2023年第1期2卷 100-107页

作者： Hailing Yang Zhi Wang Mengyong Sun Fei Chen Jun Ji Sique Chen Yingying Chen Deli Ma Zhenyu Zhang Baocai Pan Yulin Wei Qinggang Li Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials University of JinanJinan 250022China School of Material Science and Engineering University of JinanJinan 250022China No.52 Institute of China North Industry Group Yantai 264003China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

As a non-toxic copolymer of isobutylene and maleic anhydride,Isobam is successfully used as a dispersant and a gelling agent for fabricating porous Si_(3)N_(4) ceramics by gel *** dispersity and rheological properties of the Si_(3)N_(4) slurry are influenced by the pH,milling time,and Isobam content which varies from 0.1 wt.%to 0.6 wt.%,and these factors are *** slurry with 40 vol.%solid content and milled for 4 h has a high zeta potential at pH 12(adjusted by Tetramethyl ammonium hydroxide(TMAH)),which means that the particles are well *** mechanisms of TMAH are electrostatic repulsion and steric *** viscosity of the slurry increases with the increase of Isobam *** pressureless sintering at 1700℃ for 2 h,a uniform unique interlocking microstructure of rod-like β-Si_(3)N_(4) grains is observed,which may improve the flexural strength of the ceramics by intergranular fracture and particle pullout of β-Si_(3)N_(4) *** density and porosity of the samples fluctuate negligibly with the increase of Isobam content,and the Si_(3)N_(4) ceramic with 0.1 wt.% Isobam exhibits the highest bending strength of 251.6 MPa among all samples.

关键词： Si_(3)N_(4)ceramics Viscosity Zeta potential Gel casting Isobam

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XRD and HRTEM analyses of the ball milled nanocrystalline FeNi alloy

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Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of technology 2006年第5期28卷 4-7页

作者： Wang, Wei Guan, Jian-Guo Wang, Qi Zhang, Qing-Jie State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China School of Materials Science and Engineering University of Jinan Jinan 250022 China

The nanostructure of the ball milled FeNi particles were characterized as functions of the ball milling time (t) using quantitative X-ray diffraction (XRD), high resolution transmission electronic microscopy (HRTEM) analysis techniques. The results showed that the nanocrystalline bcc FeNi particles were availab.e using carbonyl iron and nickel powders as the raw materials during the high-energy ball milling. After 10 h ball milling, the alloy of carbonyl iron and carbonyl nickel began to form, and the sample kept its original bcc and fcc structure;after 100 h ball milling, the sample became a solid solution with bcc structure;after 200 h ball milling, the diffraction peak of Ni almost disappeared and the isotropic grains with Dmin achieved, which was mainly attributed to the dislocations of the nanocrystalline bcc FeNi suffering from severe plastic deformation by ball milling.

关键词： Alloy Carbonyl iron Carbonyl nickel High energy ball milling Nanocrystalline materials

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Influence of the Magnetic Flux on Current-Voltage Characteristics in High Power Pulsed Magnetron Sputtering

Influence of the Magnetic Flux on Current-Voltage Characteri...

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The 11th International Workshop on Plasma-Based Ion Implantation & Deposition(第11届等离子基离子注入与沉积国际会议)

作者： Zhen Shuying Ma Xinxin Tang Guangze Ken Yukimura State Key Lab of Advanced Welding Production Technology Harbin Institute of Technology Harbin 150001 China School of Material Science & Engineering Harbin Institute of Technology Harbin 150001 China National Key Laboratory of Science and Technology on Precision Hot Processing of Metals Harbin Institute of Technology Harbin 150001 China

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Sintering behavior and microwave dielectric properties of Ba1+x(Mg1/3Nb2/3)O3 ceramics

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Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of technology 2008年第8期30卷 27-29页

作者： Tian, Zhong-Qing Zhao, Wei-Lin Yu, Hong-Tao Chen, Wei-Ling School of Materials Science and Engineering Chongqing Institute of Technology Chongqing 400050 China State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Sintering behavior, microstructure and microwave dielectric properties of Ba1+x(Mg1/3Nb2/3)O3 (-0.01 [less-than or equal to] x [less-than or equal to] 0.01) were investigated. An improvement of the degree of 1:2 ordering and sinterability was found in Ba-deficient Ba(Mg1/3 Nb2/3)O3 because there existed Ba vacancies. Excessive Ba inhibits the sintering and the degree of 1:2 ordering. It was proposed that excessive Ba exist in grain boundary and inhibit the movement of grain boundary. Therefore, the sintering was restrained. Ba-deficiency had little effect on dielectric constant of Ba(Mg1/3Nb2/3)O3 ceramics. With Ba-deficiency increasing, Qf value decreased drastically.

关键词： Ba(Mg1/3Nb2/3)O3 Microwave dielectric ceramic Ordering Sinterability

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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

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Iron fibers prepared by electrodepositing in porous alumina template

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Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of technology 2006年第8期28卷 1-4页

作者： Zhao, Su-Ling Lin, Dong Guan, Jian-Guo State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Center for Material Research and Testing Wuhan University of Technology Wuhan 430070 China

The α-Fe fibers were prepared successfully by the method of electrodepositing in porous alumina template. The results indicated that the diameter of the fibers was 300 nm and the length of them increased along with the electrodepositing time increasing. The saturation magnetization per m2 of the iron fibers increased with the increasing of the length/diameter ratio, but the coercive field decreased.

关键词： Electrodepositing in porous alumina template Iron fibers Static magnetism

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Stable[email protected]Core–Shell Nanocubes with Finely Tuned Sizes for the Reduction of Nitroaromatics

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ACS Applied Nano materials 2019年第7期2卷 4584-4593页

作者： Guimin Zhang Ji Feng Shuai Wang Bozhe Xu Wenqiang Ding Weimin Wang Zhengyi Fu School of Chemistry Chemical Engineering and Life Science Wuhan University of Technology Wuhan 430070 P. R. China Department of Chemistry University of California Riverside California CA92521 United States State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 P. R. China

This paper reports a seed-mediated growth of[email protected]core–shell nanocubes with controllab.e edge lengths from 49 to 103 nm in an aqueous system using cetyltrimethylammonium bromide (CTAB) capped Pd nanocubes with sizes of 21 nm as seeds. During the growth, ascorbic acid (AA) was served as the reductant and hexadecylamine (HDA) as the capping agent and ligand to form a coordination complex with Cu2+. The edge lengths of[email protected]nanocubes could be finely tuned by changing the volume of Pd seeds while maintaining the amount of CuCl2precursor. Cu atoms initially nucleated on one or two faces of a Pd seed via localized epitaxial growth. Due to the lattice mismatch between Pd and Cu (7.1%), Pd cores were not located in the center of Cu shells during the initial deposition of Cu. Interestingly, most of Pd cores could transfer to the center of Cu nanocubes by dissolving and regrowing of the boundary to decrease the interfacial strain when a sufficient amount of CuCl2precursor and reaction time were provided. The[email protected]nanocubes exhibited strong LSPR signals and long-term stability which could be a low-cost potential substitute for Au and Ag for applications in sensing, surface-enhanced spectroscopy, optoelectronics, and photocatalysis. By comparison of the rate constant ofp-nitrophenol reduction reaction over[email protected]nanocubes with different sizes as catalyst, 83 nm[email protected]nanocubes showed the highest catalytic activity.

关键词： Palladium Nanocubes Surface plasmon resonance Transmission electron microscopy Epitaxy

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The study of artificial xenon arc lamp ageing on E-glass/vinyl ester composites

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Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica 2013年第SUPPL.期30卷 33-39页

作者： Ni, Aiqing Zhang, Lifeng Ji, Yundong Wang, Jihui State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Department of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China

The effects of artificial xenon arc lamp ageing on E-glass/vinyl ester composite were investigated. The mechanical properties of the composite are investigated by static mechanical tests, the storage and loss moduli, Tg, the peak of tanδ by DMA, the peak location and peak intensity by FTIR for pure resin and the composite, and fracture development and the relationship between fracture density and fatigue stress level by SEM, respectively. It is found out that the most significant ageing factor is ultraviolet radiation, and that the introduction of glass fiber will accelerate the crosslink and degradation of resin.

关键词： Glass fibers

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Enhancement of Energy Storage Performance in Lead-Free Barium Titanate Ceramics Via Band Structure Engineering

SSRN

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SSRN 2022年

作者： Zhang, Ying Zhang, Ganrong Li, Ang Zhang, Jiahan Zheng, Yingqiu Luo, Guoqiang Tu, Rong Zhang, Jian Shen, Qiang Zhang, Lianmeng 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 Chaozhou521000 China Collaborative Innovation Center of Advanced Microstructures School of Electronic Science and Engineering Nanjing University Nanjing210093 China

Dielectric capacitors with excellent energy storage performance (ESP) are in great demand in the power electronics industry due to their high power density. For the dielectric materials, the dielectric breakdown strength (BDS) is the key factor to improve ESP, which is the focus and bottleneck of current research, especially in the relaxor ferroelectric (RFE) materials with already low residual polarization (P r ). Here, we propose an innovative design strategy to stimulate the ESP of the BaTiO3 (BT)-based RFE ceramics by band structure engineering. The Ta element is selected to enhance the band gap of doped ceramics, occupying Ti-site in supercell of BT and optimizing the bonds length of Ti-O bond to increase the energy band of Ti 3d states. In this way, the band gap of the doped ceramics is efficiently enhanced from 1.8 eV to 2.22 eV resulting in the large BDS. Prospectively, the highest recoverable energy storage density (W rec ) of 2.85 J/cm3 is obtained at 350 kV/cm and the ultra-high energy efficiency (ղ) of 95.26% is found at 200 kV/cm. Our work reveals the relationship between elements doping in B-site and band structure, being expected to benefit for designing energy storage materials. © 2022, The Authors. All rights reserved.

关键词： Energy storage

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