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S-scheme photocatalyst Bi2O3/TiO2 nanofiber with improved photocatalytic performance

Journal of materials Science & technology 2020年第17期52卷 145-151页

作者： Rongan He Haijuan Liu Huimin Liu Difa Xu Liuyang Zhang Hunan Province Key Laboratory of Applied Environmental Photocatalysis Changsha UniversityChangsha 410022China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

In this study,a hierarchical Bi2O3/TiO2 fibrous composite was in-situ fabricated on an electrospun TiO2 nanofiber at ambient *** the Bi2O3/TiO2 composite,S-scheme electron migration occurred between Bi2O3 and *** the photocatalytic degradation of phenol under simulated sunlight,the asprepared Bi2O3/TiO2 nanofibers considerably outperformed Bi2O3 nanoparticles and TiO2 *** improvement is contributed by maintaining and effectively utilizing the useful carriers and consuming the useless holes and electrons,realized by the S-scheme heterojunction and hierarchical *** study also provides an alternative design fashion for photocatalysts.

关键词： Electrospinning Bismuth Fiber In-situ synthesis

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Microstructure evolution of 7050 aluminum forgings during surface cumulative plastic deformation

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Transactions of Nonferrous Metals Society of China 2025年第1期35卷 45-59页

作者： Jian-liang HU Ze-xiong ZHANG Cheng XING Xiu-jiang WU Shi-quan HUANG Hong BO Key Laboratory of Advanced Forging&Stamping Technology and Science Ministry of EducationYanshan UniversityQinhuangdao 066004China State Key Laboratory of Precision Manufacturing for Extreme Service Performance Central South UniversityChangsha 410083China College of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China Hebei Engineering Technology Research Center of Metal Precision Plastic Processing Yanshan UniversityQinhuangdao 066004China State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China

To elucidate the mechanisms of regulating the microstructure uniformity in 7050 aluminum forgings through surface cumulative plastic deformation(SCPD),the microstructure under different solution treatments was investigated using metallographic observation(OM),electron backscatter diffraction(EBSD),transmission electron microscopy(TEM),and X-ray diffraction(XRD).The findings demonstrate that the most uniform microstructure in the forgings is achieved with a solution treatment at 470℃for 30 *** SCPD process generates a significant number of needle-shaped precipitates,resulting in a higher dislocation density and stored *** treatments alleviate the pinning effect of second-phase particles and facilitate static recrystallization(SRX)in forgings,leading to a reduction in grain ***,mechanical testing results demonstrate 7%−13%increase in tensile strength and more uniform elongation of the forgings in different directions.

关键词： microstructure homogeneity surface cumulative plastic deformation(SCPD) static recrystallization(SRX) dislocation density

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Passivation of PEA^(+) to MAPbI_(3) (110) surface states by first-principles calculations

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Chinese Physics B 2021年第4期30卷 438-443页

作者： Wei Hu Ying Tian Hong-Tao Xue Wen-Sheng Li Fu-Ling Tang School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou 730050China Department of Materials Engineering Lanzhou Institute of TechnologyLanzhou 730050China

The MAPbI_(3)(110) surface with low indices of crystal face is a stable and highly compatible photosensitive *** the electronic states on the surface can be detrimental to the photovoltaic efficiency of the device,they should be ***(PEA^(+)),as a molecular ligand,has been widely used in continuous degradation and interfacial charge recombination experiments,and has satisfactory performance in improving surface ***,we construct an adsorption model of MAPbI_(3) with small molecules,calculating the lattice structure and electronic properties of PEA^(+)-adsorbed MAPbI_(3)(110) *** is found that PEA^(+) as apassivator can effectively weaken the electronic states and regulate the band gap of the MAPbI_(3)(110) *** and after adding the passivator,the peak value of electronic state densities at MAPbI_(3)(110) surface is reduced by about 50%,and the band gap is apparently ***,by comparing the Bader atomic charge and spatial charge distributions before and after PEA^(+)’s adsorption on the surface of MAPbI_(3),we observe a substantial change of PEA^(+) charges,which suggests the surface states have been passivated by PEA^(+).

关键词： first-principles calculations surface states passivation

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Tuning on passive interfacial cooling of covalent organic framework hydrogel for enhancing freshwater and electricity generation

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SusMat 2024年第5期4卷 139-153页

作者： Jianfei Wu Ziwei Cui Yuxuan Su Dongfang Wu Jundie Hu Jiafu Qu Jianzhang Li Fangyuan Kang Dan Tian Qichun Zhang Yahui Cai Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and EngineeringNanjing Forestry UniversityNanjingChina School of Materials Science and Engineering Suzhou University of Science and TechnologySuzhouChina State Key Laboratory of Efficient Production of Forest Resources Beijing Forestry UniversityBeijingChina Department of Materials Science and Engineering Department of ChemistryCenter of Super-Diamond and Advanced Films&Hong Kong Institute of Clean EnergyCity University of Hong KongHong KongChina

Developing an efficient freshwater and electricity co-generation device(FECGD)can solve the shortage of freshwater and ***,the poor salt resistance and refrigeration properties of the materials for FECGD put big challenges in the efficient and stable operation of these *** address these issues,we propose the covalent organic framework(COF)confined co-polymerization strategy to prepare COF-modified acrylamide cationic hydrogels(ACH-COF),where hydrogen bonding interlocking between negatively charged polymer chains and COF pores can form a salt resistant hydrogel for stabilizing tunable passive interfacial cooling(TPIC).The FECPDs based on the TPIC and salt resistance of ACH-COF display a maximum output power density of 2.28 W m-2,which is 4.3 times higher than that of a commercial thermoelec-tric generator under one solar *** production rate of freshwater can reach 2.74 kg m-2 *** results suggest that the high efficiency and scala-bility of the FECGD can hold the promise of alleviating freshwater and power shortages.

关键词： COF confined co-polymerization environmental sensing freshwater and electricity co-generation passive interfacial cooling salt resistance

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Analytical and numerical study of chirped optical solitons in a spatially inhomogeneous polynomial law fiber with parity-time symmetry potential

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Communications in Theoretical Physics 2023年第2期75卷 28-38页

作者： Yu Zhong Houria Triki Qin Zhou Research Group of Nonlinear Optical Science and Technology School of Mathematical and Physical SciencesWuhan Textile UniversityWuhan 430200China Radiation Physics Laboratory Department of PhysicsFaculty of SciencesBadji Mokhtar UniversityP.O.Box 1223000 AnnabaAlgeria State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile UniversityWuhan 430200China

This work studies the dynamical transmission of chirped optical solitons in a spatially inhomogeneous nonlinear fiber with cubic-quintic-septic nonlinearity,weak nonlocal nonlinearity,self-frequency shift and parity-time(PT)symmetry potential.A generalized variable-coefficient nonlinear Schr?dinger equation that models the dynamical evolution of solitons has been investigated by the analytical method of similarity transformation and the numerical mixed method of split-step Fourier method and Runge–Kutta *** analytical self-similar bright and kink solitons,as well as their associated frequency chirps,are derived for the first *** found that the amplitude of the bright and kink solitons can be controlled by adjusting the imaginary part of the PT-symmetric ***,the influence of the initial chirp parameter on the soliton pulse widths is quantitatively *** is worth emphasizing that we could control the chirp whether it is linear or nonlinear by adjusting optical fiber *** simulation results of bright and kink solitons fit perfectly with the analytical ones,and the stabilities of these soliton solutions against noises are checked by numerical simulation.

关键词： solitons symmetry inhomogeneous

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Enhanced Elastocaloric Effect and Mechanical Properties of Gd-Doped Ni-Co-Mn-Ti-Gd Metamagnetic Shape Memory Alloys

SSRN

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SSRN 2023年

作者： Xu, Feng Zhu, Can Wang, Jian Luo, Feng Zhu, Xinqiang Xu, Jiahui Chen, Shuquan Ma, Guoliang Chen, Fenghua Kuang, Yafei He, Jun Sun, Zhigang School of Materials Science and Engineering Taiyuan University of Science and Technology Taiyuan030024 China State Key Laboratory of Advanced Materials Composite Technology Wuhan University of Technology Wuhan430070 China Central Iron and Steel Research Institute Beijing100081 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing China

Improving elastocaloric effect (eCE) and mechanical properties is the key to developing high-performance eCE cooling materials. In this paper, the metamagnetic shape memory alloys Ni35.5Co13.5Mn35Ti15-x Gdx was successfully prepared by arc melting method, and the effects of Gd substitution for Ti on the martensitic transformation (MT) temperature, phase composition, microstructure, eCE and mechanical properties of the alloys were systematically investigated. With the introduction of Gd elements, transformation temperature shifts to low temperature, and the mechanical properties of the alloy are also enhanced. The maximum compressive strength increased from 980MPa (x=0) to 1142MPa (x=0.9). At room temperature, a large adiabatic temperature change of +13.5/-12.7 K is obtained after loading/unloading, and a constant temperature change of +5.6K/-5.5K is obtained without apparent degradation under the compressive stress of 400 MPa during 61 cycles for Ni36.5Co13.5Mn35Ti14.9Gd0.1 alloy. The underlying mechanism of the enhanced eCE and mechanical properties is also discussed. © 2023, The Authors. All rights reserved.

关键词： Titanium alloys

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Numerical simulation and experimental study of laminated incremental forming process 9

Numerical simulation and experimental study of laminated inc...

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2024 9th International Conference on Mechanical Structures and Smart materials, ICMSSM 2024

作者： Xinhai, Zhao Xuemei, Liu Zhiyuan, Si Chao, Zheng Yongchao, Tan State Key Laboratory of Advanced Equipment and Technology for Metal Forming Shandong University Shandong Jinan250061 China Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education Shandong University Shandong Jinan250061 China Mechanical Materials Mechatronic and Biomedical Engineering University of Wollongong Wollongong2522 Australia Engineer Training Center Shandong University Jinan2500002 China

In order to improve the surface quality of incremental forming parts, this paper is studied. Through numerical simulation, the influence rules of different overlapping materials and overlapping thickness on the forming quality of target parts are obtained, and the optimal forming process parameters are given. Compared with the experimental results, the better forming results were obtained. © Published under licence by IOP Publishing Ltd.

关键词： Digital elevation model

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Recent advances and perspectives of metal/covalent-organic frameworks in metal-air batteries

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Journal of Energy Chemistry 2021年第12期30卷 113-129,I0003页

作者： Ming Zhong Ming Liu Na Li Xian-He Bu School of Materials Science and Engineering Tianjin Key Laboratory of Metal and Molecule-Based Material ChemistryNankai UniversityTianjin 300350China State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou 730050GansuChina College of Chemistry Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education)Nankai UniversityTianjin 300071China

Metal-air batteries(MABs)have attracted considerable attention as a novel energy technology that can alleviate the severe energy crisis and environmental *** primary processes,including oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)occur on the air cathode and dominate the battery performance during battery charging and ***,metal-organic frameworks(MOFs)and covalent-organic frameworks(COFs)emerge as promising cathode catalysts due to their structure and composition *** unique characteristics of MOFs and COFs contribute to improved *** review mainly summarizes the recent applications of MOFs and COFs in a series of MABs,mainly including lithium-and zinc-air ***,some critical issues are emphasized regarding MOFs and COFs used in other MABs limited progress,their fabrication and alternatives to potential problems.

关键词： Metal-organic frameworks Covalent-organic frameworks Li-air batteries Zn-air batteries Active sites

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Simultaneously healing cracks and strengthening additively manufactured Co_(34)Cr_(32)Ni_(27)Al_(4)Ti_(3) high-entropy alloy by utilizing Fe-based metallic glasses as a glue

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Journal of materials Science & technology 2024年第12期179卷 125-137页

作者： Hao Kang Kaikai Song Leilei Li Xiaoming Liu Yandong Jia Gang Wang Yaocen Wang Si Lan Xin Lin Lai-Chang Zhang Chongde Cao School of Physical Science and Technology Northwestern Polytechnical UniversityXian 710072China School of Mechanical Electrical&Information EngineeringShandong UniversityWeihai 264209China Institute of Materials Shanghai UniversityShanghai 200444China Herbert Gleiter Institute of Nanoscience School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXian 710072China Centre for Advanced Materials and Manufacturing School of EngineeringEdith Cowan University270 Joondalup DriveJoondalupPerthWestern Australia 6027Australia Research and Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 518057China

Solidification cracking issues during additive manufacturing(AM)severely prevent the rapid development and broad application of this *** this work,a representative Co_(34)Cr_(32)Ni_(27)Al_(4)Ti_(3) high-entropy al-loy(HEA)susceptible to crack formation was fabricated by selective laser melting(SLM).As expected,many macroscopic cracks *** crack issues were successfully solved after introducing a certain amount of Fe-based metallic glass(MG)powder as a glue during *** effect of MG addition on the formation and distribution of defects in the SLM-processed HEA was quantitatively *** an increasing mass fraction of the MG,the dominant defects transformed from cracks to lack of fusion(LOF)defects and finally ***,the MG preferred to be segregated to the boundaries of the molten ***,the coarse columnar crystals gradually transformed into equiaxed crystals in the molten pool and fine-equiaxed crystals at the edge of the molten pool,inhibiting the initiation of cracks and providing extra grain boundary ***,multiple precipitates are formed at the boundaries of cellular structures,which contribute significantly to *** to the brit-tle SLM-processed Co_(34)Cr_(32)Ni_(27)Al_(4)Ti_(3) HEA,the SLM-processed HEA composite exhibited a high ultimate tensile strength greater than 1.4 Ga and enhanced *** work demonstrates that adding Fe-based MG powders as glues into SLM-processed HEAs may be an attractive method to heal cracks and simultaneously enhance the mechanical properties of additively manufactured products.

关键词： Selective laser melting High-entropy alloys Crack healing Metallic glasses Mechanical properties

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Benzobisthiazole Polymer with Resonance-assisted Hydrogen Bonds for High-performance Transistor and Solar Cell Applications

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Chinese Journal of Polymer Science 2022年第2期40卷 147-156页

作者： Bing-Yong Liu Cong Xie Cong-Wu Ge Meng-Meng Cui Wei Yang Zai-Fei Ma Xi-Ke Gao Yin-Hua Zhou Qing Zhang Shanghai Key Laboratory of Electrical Insulation and Thermal Aging School of Chemistry and Chemical EngineeringShanghai Jiaotong UniversityShanghai 200240China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules Center for Excellence in Molecular SynthesisShanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai 200032China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Center for Advanced Low-dimension MaterialsDonghua UniversityShanghai 201620China

Benzobisthiazole polymer with resonance-assisted hydrogen bonds(RAHBs)has been synthesized for both organic field-effect transistor and polymer solar cell *** properties of the hydrogen bonded polymer are compared with the reference polymer without ***-crystal X-ray diffraction analyses of the building block reveal that the RAHB interactions are formed between the carbamate hydrogen and imine nitrogen of the *** hydrogen donor and acceptor are connected byπ-conjugated molecular framework and the hydrogen-bridged quasi aromatic rings lock the conformation of the building *** building block adopted a layered sandwich packing in crystal instead of slipped herringbone stacking which was often found in the crystal of benzobisthiazole *** polymer PCBTZ-TT with RAHBs showed deeper HOMO/LUMO energy level(about 0.2 eV)than reference *** PCBTZ-TT demonstrated the hole mobility of0.96 cm^(2)·V^(-1)·s^(-1) in field-effect transistor devices and achieved power conversion efficiency of 13.6%in solar cell devices with Y6 as acceptor without any additive.

关键词： Resonance-assisted hydrogen bonding Benzobisthiazole Thiazole OFET OPV

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