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Facile synthesis of hierarchically structured manganese oxides as anode for lithium-ion batteries

Journal of Central South University 2019年第6期26卷 1481-1492页

作者： DENG Zhao HUANG Xing ZHAO Xu CHENG Hua WANG Hong-en State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Institute of Chemical Materials China Academy of Engineering PhysicsMianyang 621900China Department of Materials Science and Technology Southern University of Science and TechnologyShenzhen 518055China

Developing high-performance lithium ion batteries(LIBs)using manganese oxides as anodes is attractive due to their high theoretical capacity and abundant ***,we report a facile synthesis of hierarchical spherical MnO2 containing coherent amorphous/crystalline domained by a simple yet effective redox precipitation reaction at room ***,flower-like CoMn2O4 constructed by single-crystalline spinel nanosheets has been fabricated using MnO2 as *** mild methodology avoids undesired particle aggregation and loss of active surface area in conventional hydrothermal or solid-state ***,both MnO2 and CoMn2O4 nanosheets manifest superior lithium-ion storage properties,rendering them promising applications in LIBs and other energy-related fields.

关键词： manganese oxides nanostructures anode materials lithium ion batteries electrochemistry

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Relationship between Temperature and Deformation Behaviours in Aupt20 Nano Polycrystalline Alloys

SSRN

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SSRN 2022年

作者： Li, Pengtao Jin, Na Hu, Rui Liu, Yi Liu, Jinwang Wang, Bowen Yan, Haixue State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi’an710072 China Shaanxi province Key Laboratory for Electrical materials and Infiltration Technology School of Materials Science and Engineering Xi’an University of Technology Xi’an710048 China School of Material Science and Engineering Sichuan University Chengdu610065 China State Key Laboratory of New Technologies for Comprehensive Utilization of Platinum Metals Sino-Platinum Metals Co. LTD Kunming650106 China School of Engineering & Material Science Queen Mary University of London Mile End Road LondonE1 4NS United Kingdom

As a crucial detection material, AuPt20 alloy has become a research hotspot due to its ultra-low magnetic susceptibility, while the expensive cost of preparation restricts the possibility of its in-depth research. The combinative study based on simulation and experiment of AuPt20 noble alloy provides a possibility to reveal the temperature-dependent deformation mechanisms at low cost. Thus, the preparation of AuPt20 alloy at decimetre scale was carried out for the first time, and the analysis of microstructure results showed that substitutional solid solution with equiaxed crystal is the key feature. Next, based on the experimental information, the deformation behaviour of the AuPt20 nano-polycrystalline alloys is investigated at different temperatures by molecular dynamic simulation. For a comprehensive understanding of the processes, mechanical properties of the Au and Pt nano-polycrystalline alloys are explored as well. The results of numerical simulations indicate that temperature has a strong influence on the deformation mechanism of the alloys. When temperature is below 600 K, the critical grain size (∼ 7.59 nm) becomes a dominant factor controlling the deformation process in the Au NPC. In the AuPt20 nano-polycrystalline alloys, the motion of dislocations in the grain size smaller than the critical size dominates the deformation process. Once the strain exceeds 10.0%, the severe plastic deformation began at almost every grains. At higher temperatures (≥ 600 K), in the AuPt20 nano-polycrystalline alloy, the plastic mechanism changes from the plastic deformation to the boundary slip and recrystallization. © 2022, The Authors. All rights reserved.

关键词： Binary alloys

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Building Rapid Charge Transfer Channel Via Engineering Ni Coordinated Flexible Polymer for Efficient Solar Hydrogen Evolution

SSRN

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SSRN 2022年

作者： Zhang, Yiming Wang, Xu-Sheng Ren, Xiaohui Luo, Shunqin Huang, Hengming Chen, Rongsheng Shao, Shibo Liu, Dan Gui, Jianzhou Ye, Jinhua State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal School of Materials Science and Engineering Lanzhou University of Technology Lanzhou730050 China 1-1 Namiki Ibaraki Tsukuba305-0044 Japan State Key Laboratory of Separation Membranes and Membrane Processes Tianjin Key Laboratory of Green Chemical Technology and Process Engineering School of Chemical Engineering and Technology Tiangong University Tianjin300387 China School of Materials Science and Engineering Zhejiang Sci-Tech University Hangzhou310018 PR China The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and Technology Wuhan430081 China School of Engineering The University of Edinburgh EdinburghEH9 3BF United Kingdom Graduate School of Chemical Sciences and Engineering Hokkaido University Sapporo060-0814 Japan TJU-NIMS International Collaboration Laboratory School of Material Science and Engineering Tianjin University Tianjin300072 China

Building rapid charge transfer channel from photocatalysts to cocatalysts can greatly improve the photocatalytic performance, yet remains a grand challenge. In this work, a flexible polymer engineering strategy was utilized to fabricate a homogeneous conductive N-doped carbon (NC) layer between CdS photo-absorber and surface NiO cocatalyst. The detailed formation procedure of NC layers was unraveled by a series of in-situ and ex-situ temperature-dependent analysis. Such a bifunctional layer can serve as not only a rapid charge transfer channel for photo-induced charge carriers, but also modulate the adsorption of H on NiO cocatalyst for concertedly boosting solar hydrogen production performance (101.92 mmol h-1 g-1). The DFT calculation together with SI-XPS, PL, TRPL, EIS and photocurrent plots indicated that the generated built-in electric field with the direction from NiO nanoparticles to NC layers could accelerate the excited electrons transfer to active sites. Furthermore, the adsorption and desorption energy of hydrogen on NiO nanoparticles was also optimized by the NC layers, as verified by DFT calculation. This work provides new insights into interfacial engineering between catalysts and cocatalysts for highly efficient photocatalysis. © 2022, The Authors. All rights reserved.

关键词： Charge transfer

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Red mud-derived iron carbon catalyst for the removal of organic pollutants in wastewater

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Chemosphere 2023年第1期337卷 139211页

作者： Fei, Yawen Han, Ning Shi, Junjie Tang, Shiyu Zhuang, Hezhen Wang, Longyu Ran, Jincheng Gao, Enxia Habila, Mohamed A. Chen, Zhijie Tao, Dongping Ni, Bing-Jie Jiang, Man School of Resources and Environmental Engineering Shandong University of Technology Zibo255000 China State Key Laboratory of Mineral Processing Beijing100160 China Department of Materials Engineering KU Leuven Leuven3001 Belgium Shandong Yanggu Huatai Chemical Company Limited Liaocheng252300 China School of Resources and Civil Engineering Northeastern University Shenyang110819 China Department of Chemistry College of Science King Saud University P. O. Box 2455 Riyadh11451 Saudi Arabia Center for Technology in Water and Wastewater School of Civil and Environmental Engineering University of Technology Sydney NSW2007 Australia

In order to reduce the environmental hazards of red mud (RM) and realize its resource utilization, in this study, RM-based iron-carbon micro-electrolysis material (RM-MEM) were prepared by a carbothermal reduction process using RM as raw material. The influence of the preparation conditions on the phase transformation and structural characteristics of the RM-MEM were investigated during the reduction process. The ability of RM-MEM to remove organic pollutants from wastewater was evaluated. The results showed that RM-MEM prepared at a reduction temperature of 1100 °C, a reduction time of 50 min and a coal dosage of 50% had the best removal effect for the degradation of methylene blue (MB). When the initial MB concentration was 20 mg L−1, the amount of RM-MEM material was 4 g L−1, the initial pH was 7, and the degradation efficiency reached 99.75% after 60 min. When RM-MEM is split into carbon free and iron free parts for use, the degradation effect becomes worse. Compared to other materials, RM-MEM has lower cost and better degradation. X-ray diffraction (XRD) analysis showed that hematite was transformed to zero-valent iron with the increase in the roasting temperature. Scanning electron microscopy (SEM) and energy spectroscopy (EDS) analysis showed that micron-sized ZVI particles were formed in the RM-MEM, and increasing the carbon thermal reduction temperature was beneficial to the growth of zero-valent iron particles. © 2023 Elsevier Ltd

关键词： Organic pollutants

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High-performance green and blue quantum-dot light-emitting diodes with eliminated charge leakage

arXiv

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arXiv 2021年

作者： Deng, Yunzhou Peng, Feng Lu, Yao Zhu, Xitong Jin, Wangxiao Qiu, Jing Dong, Jiawei Hao, Yanlei Di, Dawei Gao, Yuan Sun, Tulai Wang, Linjun Ying, Lei Huang, Fei Jin, Yizheng Key Laboratory of Excited-State Materials of Zhejiang Province State Key Laboratory of Silicon Materials Department of Chemistry Zhejiang University Hangzhou310027 China Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou510640 China Key Laboratory of Excited-State Materials of Zhejiang Province Department of Chemistry Zhejiang University Hangzhou310027 China State Key Laboratory of Modern Optical Instrumentation College of Optical Science and Engineering International Research Center for Advanced Photonics Zhejiang University Hangzhou310027 China Najing Technology Corporation Ltd Hangzhou310052 China Center for Electron Microscopy State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology College of Chemical Engineering Zhejiang University of Technology Hangzhou310014 China

Quantum-dot light-emitting diodes (QD-LEDs) promise a new generation of efficient, low-cost, large-area, and flexible electroluminescent devices. However, the inferior performance of green and blue QD-LEDs is hindering the commercialization of QD-LEDs in display and solid-state lighting. Here, we demonstrate best-performing green and blue QD-LEDs with ∼100% conversion of the injected charge carriers into emissive excitons. key to this success is eliminating electron leakage at the organic/inorganic interface by using hole-transport polymers with low electron affinity and reduced energetic disorder. Our devices exhibit record-high peak external quantum efficiencies (28.7% for green, 21.9% for blue), exceptionally high efficiencies in wide ranges of luminance, and unprecedented stability (T95 lifetime: 580,000 h for green, 4,400 h for blue). The overall performance surpasses previously reported solution-processed green and blue LEDs. Copyright © 2021, The Authors. All rights reserved.

关键词： Organic light emitting diodes (OLED)

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Molecular-level imaging of hydrogen-bonded organic frameworks by cryogenic low-dose electron microscopy

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Green Chemical Engineering 2025年

作者： Yikuan Liu Yanbin Chen Liwei Xia Shuo Zhang Zhangnan Zhong Liwei Wang Yujie Huang Xinru Jiang Mengru Bu Qunfeng Zhang Xiaonian Li Yihan Zhu Center for Electron Microscopy Zhejiang Key Laboratory of Surface and Interface Science and Engineering for Catalysts China-Saudi Arabia Joint Laboratory on Microscopic Structural Engineering of Advanced Materials State Key Laboratory of Green Technologies for Chemical Synthesis and Conversion and College of Chemical Engineering Zhejiang University of Technology Hangzhou 310014 China

The fundamental problems associated with structural inhomogeneities of hydrogen-bonded organic frameworks (HOFs), such as surface terminations and host-guest heterostructures that govern their functionalities and growth mechanisms, remain a critical gap in knowledge. This arises from the lack of advanced real-space structural characterization tools with molecular precision. By leveraging state-of-the-art cryogenic low-dose electron microscopy, this work overcomes the beam damage limitations of traditional techniques and elucidates the crystal structures, surface terminations, and host-guest structures of HOFs at molecular-level. Real-space observations confirm lateral crystal growth consistent with the terrace-ledge-kink (TLK) model, but deviate from the classical monomer-addition mechanism. Instead, we propose a nonclassical cooperative multisite monomer-addition mechanism, where simultaneous monomer addition at both framework and guest sites eventually drives crystal faceting.

关键词： Hydrogen-bonded organic framework Low-dose electron microscopy Cryo-EM Surface termination Host-guest structure

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无模板法合成具有增强催化活性的分级纳米孔结构MIL-101(Cr)

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中国科学：材料科学（英文版） 2021年第1期64卷 252-258页

作者：赵田李松贺肖宇轩 Christoph Janiak 常刚刚田歌阳晓宇 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing & School of Materials Science and Engineering & School of Chemistry Chemical Engineering and Life Science Wuhan University of Technology Wuhan 430070 China Key Laboratory of Advanced Packaging Materials and Technology of Hunan Province School of Packaging and Materials Engineering Hunan University of Technology Zhuzhou 412007 China Institut für Anorganische Chemie und Strukturchemie Universität Düsseldorf Universitätsstr. 1 D-40225 Düsseldorf Germany Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) & School of Chemical Engineering and Technology Sun Yat-sen University Zhuhai 519000 China School of Engineering and Applied Sciences Harvard University Cambridge Massachusetts 02138 USA

MIL-101(Cr)是最重要的金属有机框架(MOFs)材料之一,稳定的框架结构和超高的比表面积使其在众多科学领域得到了广泛研究和应用.但是MIL-101(Cr)的合成条件比较苛刻,且稳定性较强,因此,有关于其分级结构的研究报道仍比较少.本文提出了一... 详细信息

MIL-101(Cr)是最重要的金属有机框架(MOFs)材料之一,稳定的框架结构和超高的比表面积使其在众多科学领域得到了广泛研究和应用.但是MIL-101(Cr)的合成条件比较苛刻,且稳定性较强,因此,有关于其分级结构的研究报道仍比较少.本文提出了一种简单制备分级纳米孔结构MIL-101(Cr)的方法,即以乙酸作为调节剂,采用水热合成的方法,一步得到具有微孔-介孔-大孔分级结构的MIL-101(Cr)材料.实验结果表明,该分级结构的MIL-101(Cr)与无分级结构的MIL-101(Cr)相比,其大分子染料吸附能力和催化能力均有显著提高.而且分级结构MIL-101(Cr)负载了磷钨酸催化剂之后,表现出了与均相催化剂(纯磷钨酸)相当的催化能力.进一步研究发现,使用其他短碳链的一元羧酸作为调节剂,如丙酸、丁酸等,也可获得类似分级纳米结构MIL-101(Cr).

关键词： Template-free synthesis micro-meso-macroporous hierarchy MIL-101(Cr)

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On the nature of a peculiar initial yield behavior in metastable β titanium alloy Ti-5Al-5Mo-5V-3Cr-0.5Fe with different initial microstructures

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Journal of materials Science & technology 2020年第3期38卷 135-147页

作者： Jiangkun Fan Zhixin Zhang Puyi Gao Ruimeng Yang Huan Li Bin Tang Hongchao Kou Yudong Zhang Claude Esling Jinshan Li State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an710072China National&Local Joint Engineering Research Center for Precision Thermoforming Technology of Advanced Metal Materials Xi’an710072China School of Mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi’an710129China Laboratoire d’étude des Microstructures et de Mécanique des Matériaux(LEM3) CNRS 7239Universitéde Lorraine57045MetzFrance Laboratory of Excellence on Design of Alloy Metals for low-mAss Structures(DAMAS) Universitéde Lorraine57045MetzFrance

The compressive yielding phenomenon of titanium alloys is not as focused and sufficiently ascertain as the tensile yielding *** the present work,the peculiar compressive yielding behavior and the different dynamic responses of three different initial microstructures(singleβ,clavateβand lamellarβ)were investigated in an attractive metastableβtitanium alloy Ti-5553 using electron microscopes/crystallographic calculation/crystal plastic finite element *** reveal that the distinct compressive yielding behavior,steep peaks of sudden drop in the initial stage(very small true strain 0.03)of stress loading have appeared in the compression stress-strain curves except for the lamellarβinitial *** slip is the essential mechanism of the initial yielding *** multiple-slip bands formed in the singleβinitial microstructure during the warm deformation process.A small quantity of single slip bands was observed in the deformed clavateβinitial *** abundant varied nano/ultrafineβsprecipitates were nucleated dynamically and dispersedly in all the three deformed initial *** multiple-slip bands formation and substantial nanoscaleβsresult in the highest peak of flow stress for singleβinitial *** compressive slip bands are formed early in the elastic–plastic deformation *** the increasing strain,the sample showed a significant compressive bulge,or eventually forming a strong adiabatic shear band or *** results are expected to provide a reference for the study of deformation behavior and mechanical properties of metastableβtitanium alloys.

关键词： Titanium alloy Initial yield Deformation mechanism Slip band Phase transformation Ti-5553

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Effects of high pressure on fe-rich phases and mechanical properties of al-14si alloys with rheo-squeeze casting 15th

Effects of high pressure on fe-rich phases and mechanical pr...

引用

15th International conference on Semi-Solid processing of Alloys and Composites, S2P 2018

作者： Lin, Chong Wu, Shu Sen Lü, Shu Lin School of Mechanical & Electrical Engineering Wuhan Institute of Technology Wuhan China State Key Laboratory of Materials Processing and Die & Mould Technology Huazhong University of Science and Technology Wuhan China State Key Laboratory of Materials Processing and Die & Mould Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9783035713732

The influence of high pressure and manganese on Fe-rich phases (FRPs) and mechanical properties of Al-14Si-2Fe alloy with rheo-squeeze casting (RSC) were investigated. The semi-solid alloy melt was prepared using ultrasonic vibration (UV), then formed by squeeze casting (SC). Results shows that the FRPs in as-cast Al-14Si-2Fe-(0.4,0.8)Mn alloys with SC are composed of coarse plate-shaped δ-Al4(Fe,Mn)Si2, long needle-shaped β-Al5(Fe,Mn)Si and bone-shaped α-Al15(Fe,Mn)3Si2 phases when the pressure is 0 MPa. During the solidification of the alloys with RSC, the FRPs are first refined by UV, then furtherly refined as the pressure increases. With RSC, the FRPs in Al-14Si-2Fe-0.8Mn alloy are finer and rounder than that of the Al-14Si-2Fe-0.4Mn alloy under the same pressure. The FRPs in RSC Al-14Si-2Fe-0.8Mn alloy are mainly granular particles with an average diameter of about 12 μm under 300 MPa. For the alloy with the same composition, the ultimate tensile strength (UTS) of RSC sample is higher than that of the SC sample. Under the same forming process, the UTS of Al-14Si-2Fe-0.8Mn alloy is higher than that of the Al-14Si-2Fe-0.4Mn alloy. © 2019 Trans Tech Publications, Switzerland.

关键词： Silicon alloys

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Preparation of Al matrix nanocomposites by diluting the composite granules containing nano-SiCp under ultrasonic vibaration

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Journal of materials Science & technology 2018年第9期34卷 1609-1617页

作者： Shulin Lü Pan Xiao Du Yuan Kun Hu Shusen Wu State Key Laboratory of Materials Processing and Die & Mould Technology Huazhong University of Science and Technology

In this work, an efficient process by diluting the nano-SiCp/Al composite granules in the molten matrix under ultrasonic vibration（UV） was developed to prepare metal matrix nano-composites（MMNCs）.Millimeter-sized composite granules with high content of SiC particle（8 wt%） were specially fabricated by dry high-energy ball milling（HBM） without process control agent, and then remelted and diluted in molten Al alloy under UV. The MMNCs melt was finally squeeze cast under a squeeze pressure of 200 MPa, Microstructure of the composite granules during dry HBM was investigated, and the effect of UV on microstructure and mechanical properties of the MMNCs was discussed. The results indicate that nano-SiC particles are uniformly distributed in the nano-SiCp/Al composite granules, which are covered by vestures of pure Al. During diluting, nano-SiC particles released from the composite granules are quickly dispersed in the molten matrix by UV within 4 min. Microstructure of MMNCs is significantly refined under UV and squeeze casting, eutectic Si phase modified to fine islands with an average length of 1.4 μm. Tensile strength of the squeeze cast MMNCs with 1 wt% of nano-SiC particles is 269 MPa, which is improved by 25% compared with the A356 alloy matrix.

关键词： Al matrix nano-composites Dry high-energy ball milling Ultrasonic vibration Composite granules Microstructure

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