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Semiconductors modified gourd-shaped hollow PtNi and their directional electron and mass transfer effects

Chemical Engineering Journal 2023年 474卷

作者： Fu-Fei Pu Yu-Xuan Xiao Xiong Yang Fei Yu Lei Xia Jiang-Bo Chen Lu Wu Jing-Jing Xie Wen-Ying Zhao Yu Liu Li-Ying Wang Jie Ying Mei-Jing Liao Kenneth I. Ozoemena Ge Tian Fazhou Wang Xiao-Yu Yang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing & State Key Laboratory of Silicate Materials for Architectures & Shenzhen Research Institute & Joint Laboratory for Marine Advanced Materials in National Laboratory for Marine Science and Technology (Qingdao) School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China School of Chemical Engineering and Technology Sun Yat-sen University Zhuhai 519082 China Institute of Precision Measurement Science and Technology Innovation Chinese Academy of Sciences Wuhan 430064 China School of Chemistry and Chemical Hubei University Wuhan 430062 China Molecular Sciences Institute School of Chemistry University of the Witwatersrand Johannesburg 2050 South Africa

Maximization of the utilization of electronic energy and enhancement of mass transfer are important goals in designing high-performance electrocatalytic PtNi nanoalloys. However, realization of such a combination of these properties into Pt based electrocatalysts remains a significant challenge. In an effort targeted at attaining these goals, we prepared several semiconductors (BiVO 4 , CdS and TiO 2 ) modified, gourd-shaped hollow PtNi nanocomposites . We observed that among members of this group, BiVO 4 modified PtNi (denoted as BiVO 4 /PtNi) displays optimal directional electron and mass transfer, which are attributed to the closeness of the work functions of BiVO 4 and PtNi, and a unique gourd-shaped, hollow structure. Moreover, BiVO 4 /PtNi displays remarkable electrocatalytic performance in the hydrogen evolution reaction, in terms of low overpotential of 23 mV to drive the current density of 10 mA cm −2 and a low Tafel slope of 40 mV dec −1 in alkaline natural seawater. Furthermore, this nanocomposite exhibits high stability during a 20-h durability test that greatly exceeds that of commercial Pt/C. The results of this investigation show that new approaches exist for designing novel nanomaterials that have superior performance as electrocatalysts or in other practical applications.

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Triplet Acceptors with a D-A Structure and Twisted Conformation for Efficient Organic Solar Cells

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Angewandte Chemie 2020年第35期132卷 15153-15159页

作者： Qin L. Liu X. Zhang X. Yu J. Yang L. Zhao F. Huang M. Wang K. Wu X. Li Y. Chen H. Xia J. Lu X. Gao F. Yi Y. Huang H. Center of Materials Science and Optoelectronics Engineering College of Materials Science and Opto-Electronic Technology & CAS Center for Excellence in Topological Quantum Computation & CAS Key Laboratory of Vacuum Physics University of Chinese Academy of Sciences Beijing 100049 China Department of Physics Chemistry and Biology (IFM) Linköping University Linköping 58183 Sweden Key Laboratory of Luminescence and Optical Information Ministry of Education School of Science Beijing Jiaotong University Beijing 100044 China Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic Solids CAS Research/Education Center for Excellence in Molecular Sciences Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and Devices School of Chemistry Chemical Engineering and Life Science Wuhan University of Technology Wuhan 430070 China Department of Physics The Chinese University of Hong Kong New Territories Hong Kong

Triplet acceptors have been developed to construct high-performance organic solar cells (OSCs) as the long lifetime and diffusion range of triplet excitons may dissociate into free charges instead of net recombination when the energy levels of the lowest triplet state (T1) are close to those of charge-transfer states (3CT). The current triplet acceptors were designed by introducing heavy atoms to enhance the intersystem crossing, limiting their applications. Herein, two twisted acceptors without heavy atoms, analogues of Y6, constructed with large π-conjugated core and D-A structure, were confirmed to be triplet materials, leading to high-performance OSCs. The mechanism of triplet excitons were investigated to show that the twisted and D-A structures result in large spin–orbit coupling (SOC) and small energy gap between the singlet and triplet states, and thus efficient intersystem crossing. Moreover, the energy level of T1 is close to 3CT, facilitating the split of triplet exciton to free charges. © 2020 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA

关键词： D-A structures long lifetime excitons organic solar cells triplet acceptors twisted conformation

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1T-MoS2 Enriched Hierarchical MoS2/MoO3 Produced by Phase Transformation for the Efficient Hydrogen Evolution Reaction

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Chemistry, an Asian journal 2023年第5期18卷 2023 Jan 25页

作者： Xiao Zhang Yi-Xuan Liu Yi Lu Ge Tian Xiao-Yu Yang Wuhan University of Technology International School of Materials Science and Engineering CHINA. Wuhan University of Technology School of Materials Science and Engineering CHINA. Heinrich-Heine-Universitat Dusseldorf Institut für Anorganische Chemie und Strukturchemie CHINA. Wuhan University of Technology State Key Laboratory of Advanced Technology for Materials Synthesis and Processing CHINA. Wuhan University of Technology 122 Luoshi Road 430070 Wuhan CHINA.

In recent years, transition metal sulfides have been widely studied in the context of their use as electrocatalysts. The electrocatalytic propensity of the classical semiconductor MoS2, which exists in the 1T and 2H phase structures, has attracted extensive attention. Therefore, the synthesis of highly active and stable MoS2-based catalysts has become the goal of many research efforts. We recently developed a method that can be utilized to prepare the MoS2/MoO3 heterojunction in a phase-controlled manner. 1T-MoS2 phase enriched MoS2/MoO3 heterojunction can be generated using a simple hydrothermal and acid treatment sequence and that the heterojunction has a unique three-dimensional structure, large active surface area, and therefore achieve a low overpotential and high catalytic current density, as well as the long-term stability for the hydrogen evolution reaction.

关键词： 1T-MoS2 MoS2/MoO3 hierarchical heterojunction phase transformation hydrogen evolution reaction

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Direct observation of the TiO 2 anatase-rutile phase transition by in-situ transmission electron microscopy

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materials Characterization 2025年 227卷

作者： Chao-Fan Li Zhi-Yi Hu Weihua Li Yu Li Bao-Lian Su Henan Academy of Sciences Zhengzhou 450046 PR China Institute of Chemistry Henan Academy of Sciences Zhengzhou 450002 PR China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road 430070 Wuhan Hubei PR China Nanostructure Research Centre (NRC) Wuhan University of Technology 122 Luoshi Road 430070 Wuhan Hubei PR China Laboratory of Inorganic Materials Chemistry (CMI) University of Namur 61 rue de Bruxelles B-5000 Namur Belgium

Hybrid TiO 2 anatase-rutile polymorphs are widely used in commercial photocatalysts because its phase junction effectively separates the photogenerated carriers and improves the photocatalytic performance. However, the dynamic mechanism of anatase-to-rutile phase transition is still unclear due to the limited direct characterization and observation of the phase transition process. Here, we directly reveal the structural and compositional evolution of the TiO 2 anatase-rutile phase junction via in-situ (scanning) transmission electron microscopy ((S)TEM) coupled with a quantitative analysis of electron energy loss spectroscopy (EELS) data. The growth process of rutile nanoparticles and the behavior of the phase transition are visualized in real time as a function of temperature. The results demonstrate that the combination of defect and local strain in the phase junction promote the anatase-to-rutile phase transition across the interface. Our work directly unveils the kinetics of the TiO 2 anatase-rutile phase transition and provides a guidance on the rational design of hybrid materials to tailor the material properties.

关键词： Electron energy loss spectroscopy

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In-situ signal amplification of microneedles in a transistor for allergy molecular detection

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Biosensors and Bioelectronics 2025年 287卷

作者： Mengwei Wang Hongwei Ge Chao Ma Xuanyuan Hu Xiaomeng Li Hanyu Jia Xuying Liu Qingqing Sun School of Materials Science and Engineering State Key Laboratory of Structural Analysis National Engineering Research Center for Advanced Polymer Processing Technology Zhengzhou University Zhengzhou 450001 China National Center for International Joint Research of Micro-nano Molding Technology School of Mechanics and Safety Engineering Zhengzhou University Zhengzhou 450001 China

The rapid and accurate detection of histamine is of great significance for the early diagnosis and precise treatment of allergic diseases. Traditional histamine detection usually is more invasive and limited for the detection of allergic reactions in local areas. In this work, microneedles (MNs) enable of in-situ transdermal detection are employed as the extended gate of the thin-film transistor (TFT). By combing the in-situ signal amplification of TFT, the MN-TFT is integrated for the high-specific and high-sensitive detection of subcutaneous histamine. This approach retains the semi-invasive, real-time detection benefits of MNs while amplifying signals and enhancing sensor sensitivity through the transistor. In addition, the recognition layer on the MN sensing electrode is constructed by the electro-polymerization of molecular imprinted polymers (MIPs), which contains specific cavities designed to bind histamine molecules through hydrogen bonding to ensure the stability and specificity. The results show that the MN-TFT demonstrates good detection sensitivity (18.1 μA/decade) and specificity with the limit of detection (LoD) improved by a factor of ∼10 4 . Further, the subcutaneous detection results demonstrate that the MN-TFT exhibits excellent specificity for histamine in mice, enabling precise monitoring of histamine fluctuations over time in vivo.

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Ultra-High Proportion of Grain Boundaries in Zinc Metal Anode Spontaneously Inhibiting Dendrites Growth

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Angewandte Chemie 2024年第32期136卷

作者： Sitian Lian Zhijun Cai Prof. Mengyu Yan Prof. Congli Sun Nianyao Chai Bomian Zhang Kesong Yu Ming Xu Dr. Jiexin Zhu Dr. Xuelei Pan Dr. Yuhang Dai Jiazhao Huang Bo Mai Ling Qin Wenchao Shi Qiqi Xin Xiangyu Chen Dr. Kai Fu Prof. Qinyou An Dr. Qiang Yu Prof. Liang Zhou Dr. Wen Luo Dr. Kangning Zhao Prof. Xuewen Wang Prof. Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 P. R. China Department of Physics The Chinese University of Hong Kong Shatin New Territories Hong Kong 999077 P. R. China Advanced Technology Institute University of Surrey Guildford Surrey GU2 7XH UK State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan Hubei 430074 P. R. China Minhang Hospital Shanghai Medical College of Fudan University Shanghai 201199 P. R. China Laoshan Laboratory Qingdao 266237 P. R. China School of Physical Sciences Great Bay University Dongguan 523808 P. R. China

Aqueous Zn-ion batteries are an attractive electrochemical energy storage solution for their budget and safe properties. However, dendrites and uncontrolled side reactions in anodes detract the cycle life and energy density of the batteries. Grain boundaries in metals are generally considered as the source of the above problems but we present a diverse result. This study introduces an ultra-high proportion of grain boundaries on zinc electrodes through femtosecond laser bombardment to enhance stability of zinc metal/electrolyte interface. The ultra-high proportion of grain boundaries promotes the homogenization of zinc growth potential, to achieve uniform nucleation and growth, thereby suppressing dendrite formation. Additionally, the abundant active sites mitigate the side reactions during the electrochemical process. Consequently, the 15 μm Fs−Zn||MnO 2 pouch cell achieves an energy density of 249.4 Wh kg −1 and operates for over 60 cycles at a depth-of-discharge of 23 %. The recognition of the favorable influence exerted by UP-GBs paves a new way for other metal batteries.

关键词： zinc anode grain boundary femtosecond laser aqueous battery nucleation mode

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Characterization of Complex Arranged Rolling Contact Fatigue (Rcf) Cracks in Railway Rails Using Acfm Sensor

SSRN

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SSRN 2022年

作者： Hou, Yanping Shen, Jialong Fang, Jie Meng, Zhengbing Liu, Guangmu Zhou, Lei Key Laboratory of New Processing Technology for Nonferrous Metal & Materials Ministry of Education/Guangxi Guilin University of Technology Guilin541004 China Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources Guilin University of Technology Guilin541004 China Research and Design Department Guangxi Shenglong Metallurgical Co. Ltd Fangchenggang538000 China Advanced Manufacturing and Materials Centre WMG University of Warwick CoventryCV4 7AL United Kingdom

Rolling contact fatigue (RCF) cracks are threatening to the security of passenger and heavy-haul railways. Complex arranged RCF cracks such as intersecting cracks and bifurcating cracks, etc. are difficult to be identified and characterization using non-destructive methods in railway maintenances. The alternating current field measurement (ACFM) is an electromagnetic non-destructive measurement that is sensitive to small size defects at metallic surfaces and is used to detect and sizing RCF cracks in railway rails. In this paper, the development of ACFM modelling capability to consider non-uniform RCF cracks clusters and intersecting/bifurcating cracks are presented. A novel ACFM signal-By signal is proposed and used to identify intersecting and bifurcating cracks. Results show that the By signal is beneficial to detect complex arranged RCF cracks and is sensitive to variations of intersecting/bifurcating angles and positions. Modelling results can be incorporated into the ACFM sizing algorithm to improve dimension characterization of RCF cracks. © 2022, The Authors. All rights reserved.

关键词： Railroads

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Reasonable design of high-capacity MnO2/MXene/CF flexible cathodes for quasi-solid-state aqueous zinc-ion batteries

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Journal of Alloys and Compounds 2025年 1031卷

作者： Pang, Xinyu Liu, Qifan Li, Maokun Fan, Zhanhui Yang, Chao Qiu, Jianhui He, Minhua Zang, Limin MOE Key Laboratory of New Processing Technology for Nonferrous Metal and Materials Guangxi Key Laboratory of Optical and Electronic Materials and Devices Guangxi Colleges and Universities Key Laboratory of Natural and Biomedical Polymer Materials College of Materials Science and Engineering Guilin University of Technology Guilin541004 China Guangxi Key Laboratory of Advanced Structural Materials and Carbon Neutralization Guangxi Minzu University Nanning530006 China Department of Machine Intelligence and Systems Engineering Faculty of Systems Science and Technology Akita Prefectural University Yurihonjo015-0055 Japan Guangxi Huazheng New Energy Technology Co. Ltd. Chongzuo532299 China

Manganese-based aqueous zinc-ion batteries (AZIBs) have garnered growing interest in the area of adaptable and wearable devices because of their properties of simple manufacturing, superior safety, and ecological compatibility. Nevertheless, the actual implementation of Mn-based cathodes has faced challenges due to their inadequate conductivity and poor cycling performance. In this study, a chemical synthesis approach was employed to directly grow MnO2 on the surface and within the interlayer spaces of MXene. Subsequently, the composite was coated onto carbon felt (CF) using the impregnation method to fabricate binder-free MnO2/MXene/CF cathodes for AZIBs. The excellent conductivity and structural stability of MXene effectively enhance ion/electron transport kinetics and mitigate irreversible volume changes of MnO2 during charge and discharge processes. CF with excellent electrical conductivity and flexibility serves as an ideal current collector and substrate material for loading active materials. Moreover, its distinctive three-dimensional porous structure facilitates optimal interaction between the electrode material and the electrolyte. Consequently, the flexible quasi-solid-state AZIB, consisting of the optimized MnO2/MXene/CF cathode and zinc foil anode, exhibits high charge storage performance (a specific capacity of 429.1 mAh g−1 at 0.1 A g−1 and an excellent energy density of 343.2 Wh kg−1 at 79.9 W kg−1). Density functional theory analysis reveals that the incorporation of MXene enhances electron adsorption on MnO2 and significantly alters the density of states of MnO2, thus markedly improving its conductivity. These encouraging findings suggest that manganese-based materials hold great potential for application as cathodes in flexible quasi-solid-state AZIBs. © 2025 Elsevier B.V.

关键词： Carbon carbon composites

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Effect of vacuum on porosity and mechanical properties of high-pressure die-cast pure copper

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China Foundry 2019年第4期16卷 232-237页

作者： Hong-mei Yang Zhi-peng Guo Hua-zhong Yang Zhi-hua Fu Zhou-meng Pu Shou-mei Xiong School of Materials Science and Engineering Tsinghua University Beijing 100084 China Key Laboratory for Advanced Materials Processing Technology Ministry of Education Beijing 100084 China Yunnan Copper Die-casting Technology Co. Ltd. Kunming 650001 China

Pure copper tensile bars were produced by conventional die casting(HPDC) and vacuum-assist die casting(VADC) processes. Porosity and mechanical properties were investigated by using optical microscopy(OM), scanning electron microscopy(SEM), energy dispersive spectroscopy(EDS), X-ray computed tomography(XCT) and tensile tester. Results show that porosities including gas porosity and shrinkage porosity could be observed in copper castings. Since the application of vacuum could reduce filling related gas entrapment and facilitate solidification due to the increased heat transfer between metal and die, both number and size of the entrapped gases, as well as shrinkage porosities were significantly reduced in vacuum-assist die castings of pure copper. The porosity fraction decreased from 2.243% to 0.875% compared with that of the conventional die casting. Besides, mechanical properties were improved significantly, i.e., by 15% for ultimate tensile strength and three times for elongation.

关键词： vacuum copper high pressure die casting (HPDC) mechanical properties porosity

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Probing the degenerate pattern growth of {100}<011> orientation in a directionally solidified Al-4.5 wt% Cu alloy

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Journal of materials Science & technology 2019年第7期35卷 1309-1314页

作者： Yumin Wang Shuangming Li Zhenpeng Liu Hong Zhong Lei Xu Hui Xing State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an710072China College of Materials Science and Engineering Qingdao University of Science and TechnologyQingdao266000China MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Shaanxi Key Laboratory of Condensed Matter Structure and PropertiesNorthwestern Polytechnical UniversityXi'an710129China

Degenerate pattern is a seemingly disordered morphology but it exhibits the inherently ordered crystal connected with tip-splitting and limited stability which makes it difficult to observe in the metallic system. Here we employ(100)[011] orientated planar-front seeds using directional solidification and reveal the fundamental origins of the degenerate pattern growth in an Al-4.5 wt% Cu alloy. We find that the spacing of the tip-splitting(λ) in the degenerate of the alloys followed a power law,λ∝V^-0.5, and the frequency(f) of the splitting was related to the growth velocity(V) by f ∝V^1.5. The dimensionless growth direction(θ/θ0) increased monotonously and approached 0.6 with faster velocity, attributed to its anisotropy in the interface kinetics. Once growth velocity exceeded a threshold, two types of pattern transitions from degenerate to regular dendrites were proposed. One of them exhibited a random and chaotic mode and the other underwent a rotation in growth direction.

关键词： Al-Cu alloy Anisotropy Direction solidification Degenerate pattern

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