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Asymmetric charge distribution boosts hydrogen evolution performance in two-dimensional MoO_(2)/MoS_(2)step heterostructure

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Carbon Energy 2025年第2期7卷 172-182页

作者： Mengke Kang Xiang Zhang Jingyi Wang Wen Li Tianyu Xue Kun Zhai Jianyong Xiang Anmin Nie Yingchun Cheng Zhongyuan Liu Center for High Pressure Science State Key Lab of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdaoChina Key Laboratory of Flexible Electronics&Institute of Advanced Materials Jiangsu National Synergetic Innovation Center for Advanced MaterialsNanjing Tech UniversityNanjingChina Department of Chemistry Illinois Institute of TechnologyChicagoIllinoisUSA

Step heterostructures are predicted to hold a profound catalytic performance because of the rearranged electronic structure at their ***,limitations in the morphology of heterostructures prepared by hydrothermal reactions or molten salt-assisted strategies make it challenging to directly assess charge distribution and evaluate a single interface's hydrogen evolution reaction(HER)***,we prepared two-dimensional MoO_(2)/MoS_(2) step heterostructures with a large specific surface area by the chemical vapor deposition *** Kelvin probe force microscopy and electrical transport measurement verified the asymmetric charge distribution at a single *** fabricating a series of micro on-chip electrocatalytic devices,we investigate the HER performance for a single interface and confirm that the interface is essential for superior catalytic *** experimentally confirmed that the enhancement of the HER performance of step heterostructure is attributed to the asymmetric charge distribution at the *** work lays a foundation for designing highly efficient catalytic systems based on step heterostructures.

关键词： charge distribution chemical vapor deposition hydrogen evolution reaction interface step heterostructure

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Ytterbium-Catalyzed Tandem Diels-Alder/Claisen Rearrangement/Decarboxylation of Hetero-Allenes for the Synthesis of Diarylmethanes

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Chinese Journal of Chemistry 2025年第2期43卷 199-204页

作者： Bin Chen Shan Zhong Huilin Zhan Zhangyu Han Jianwei Sun Hai Huang Jiangsu Key Laboratory of Advanced Catalytic Materials&Technology School of Petrochemical EngineeringChangzhou UniversityChangzhouJiangsu213164 China Department of Chemistry The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongSAR999077 China

A tandem Diels–Alder reaction/Claisen rearrangement/decarboxylation strategy of N-allenamides (or aryloxyallenes) with 3-alkoxycarbonyl-2-pyrones has been developed for the efficient synthesis of diarylmethanes with moderate to good yields. The reaction exhibits good functional group tolerance and can be applied to late-stage modifications of known drug molecules. Mechanistic studies indicate that the ester group at the 3-position of 2-pyrones is essential, and the initial Diels–Alder reaction between the 2-pyrones and the proximal C=C bond of the N-allenamides (or aryloxyallenes) is crucial for the success of the reaction.

关键词： Hetero-allenes 2-Pyrones Diels-Alder reaction Claisen rearrangement Decarboxylation Tandem reaction

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Multi-particles micromanipulation in focused sound field for single-beam acoustic tweezer

Multi-particles micromanipulation in focused sound field for...

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2024 International Conference on Mechatronic Engineering and Artificial Intelligence, MEAI 2024

作者： Zhu, Guolong Li, Bo Xu, Junlei Zhang, Lue Sun, Lining School of Mechanical and Electric Engineering Jiangsu Provincial Key Laboratory of Advanced Robotics Soochow University Suzhou215137 China

ISBN: (纸本)9781510689176

In this paper, for the prediction of sound field distribution, a spherical piezoelectric transducer is designed for focused acoustic field according to piezoelectricity equation and vibration analysis. Based on the predicted acoustic fields distribution, the Acoustic Radiation Force(ARF) of the particles with different material and different sizes are obtained, according to a perturbation expansion of the acoustic fields in fluid. Besides, the trapping and micro-manipulation of particles are realized perpendicular to the acoustic axis through experimental according to the predicted ARF. © 2025 SPIE.

关键词： Acoustic fields

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Effects of different annealing temperatures on microstructure, mechanical properties, and magnetic properties of cold-rolled 20Mn23AlV non-magnetic structural steel

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Journal of Iron and Steel Research International 2025年第4期32卷 961-978页

作者： Xing-chang Tang Gang-hu Cheng Zhi-hui Jia Da-yang Qi Zhi-jian Zhang Ying-ying Shen Wei-lian Zhou Yuan-yuan Hou State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou730050GansuChina College of Materials Science and Engineering Lanzhou University of TechnologyLanzhou730050GansuChina Jiangsu Binxin Steel Group Co. Ltd.Lianyungang222113JiangsuChina

The variations in the mechanical and magnetic properties of cold-rolled 20Mn23AlV non-magnetic structural steel after annealing at different temperatures were *** microstructure and precipitation changes during annealing were studied by optical microscopy,scanning electron microscopy,and transmission electron *** results show that recrystallization completed after annealing at 620℃,resulting in grain sizes of approximately 800 nm and the best combination of strength and *** yield-to-tensile ratio of the non-magnetic structural steel after cold rolling continuously decreases from low to high temperatures after annealing,with the highest value being 0.89 and the lowest value being 0.43,indicating a wide range of yield-to-tensile ratio *** introduction of numerous dislocations during cold rolling provided favorable nucleation sites for precipitation,leading to abundant precipitation of the fine second-phase V(C,N).The phase composition of the samples remained unchanged as single-phase austenite after annealing,and the relative permeability values were calculated to be less than 1.002,meeting the requirements for non-magnetic steel in terms of magnetic properties.

关键词： 20Mn23AlV non-magnetic structural steel Recrystallization V(C,N)precipitation Mechanical property Magnetic property

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RGB-D visual saliency detection of stacked fruits under poor lighting

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International Journal of Agricultural and Biological Engineering 2025年第1期18卷 230-237页

作者： Chunjian Hua Xintong Zou Yi Jiang Jianfeng Yu Ying Chen School of Mechanical Engineering Jiangnan UniversityWuxi 214122JiangsuChina Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment&Technology Jiangnan UniversityWuxi 214122JiangsuChina School of Internet of Things Engineer Jiangnan UniversityWuxi 214122JiangsuChina

The saliency detection of the same kind of stacked fruits can assist robots in completing sorting tasks,which is an important prerequisite for the grading and packing of *** order to accurately obtain saliency targets of fruits in the same kind of stacked state under overexposure,non-uniform illumination,and low illumination,a method for detecting stacked fruits under poor illumination based on RGB-D visual saliency was *** on the Res2Net network,features from each layer of two images were *** realize the complementary advantages between RGB features and depth features,the input RGB images were preprocessed using depth weighting to obtain purified RGB *** increase the information interaction between branches of different scales and better balance the fusion features and modal exclusive features,a multi-scale progressive fusion module was *** minimize the difference between the initial saliency maps generated by different features and improve the accuracy of the final predicted saliency maps,a multi-branch hybrid supervised method was *** comprehensive experiments on the self-made dataset of the same kind of stacked fruits show that the proposed algorithm is superior to five state-of-the-art RGB-D SOD methods in four key indicators:S value,F value,and MAE value,which are 0.979,0.992,and 0.006,respectively,and the P-R curve,which is also closer to the upper right corner of the *** values demonstrate that the proposed algorithm can accurately obtain saliency targets in the same kind of stacked *** results of this study can promote the automatic development of the fruit production and packaging industry.

关键词： RGB-D salient object detection multi-branch fusion depth weighting mixed supervision same kind of stacked fruits

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Tungsten-substituted zeolite-regulated unsaturated cobalt atoms for robust light alkane dehydrogenation

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Journal of Energy Chemistry 2025年第4期103卷 525-534页

作者： Xichen Yin Tianjun Zhang Yanhang Ma Qiming Sun Innovation Center for Chemical Science College of Chemistry Chemical Engineering and Materials Science Jiangsu Key Laboratory of Advanced Negative Carbon Technologies Soochow University State Key Laboratory of New Pharmaceutical Preparations and Excipients College of Chemistry and Materials Science Hebei University Shanghai Key Laboratory of High-resolution Electron Microscopy & School of Physical Science and Technology Shanghai Tech University

The dehydrogenation of alkanes has emerged as a vital complementary process to address the increasing global demand for olefins.A key challenge remains in the construction of novel active centers that offer superior activity,stability,and ***,tricoordinated cobalt atoms were successfully fabricated through an in-situ ligand-protected synthesis by introducing tungsten atoms into zeolite *** unsaturated Co species efficiently activate C-H bonds while suppressing C-C bond cleavage,resulting in exceptional catalytic activity and olefin selectivity in both propane and ethane dehydrogenation *** optimized Co0.2%@0.01W-S-1 catalyst demonstrated an impressive propylene formation rate of 15.2 molC3H6gcC h-1at 823 K and an ethylene formation rate of 240.3molC2H4gCo-1h-1at 913 K,with propylene and ethylene selectivities of 99.0% and 97.5%,*** results not only significantly surpass conventional tetracoordinated Co catalysts but also rival some Pt-based catalysts under similar ***,the catalyst exhibited excellent stability in dehydrogenation reactions,with no significant loss in catalytic activity after five consecutive regeneration *** work offers valuable insights into the design of zeolite-supported non-precious metal catalysts with high activity and durability for efficient alkane dehydrogenation.

关键词： Ethane dehydrogenation Heterogeneous catalysis Propane dehydrogenation Tricoordinated cobalt Tungsten-substituted zeolite

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Interfacial B-O bonding modulated S-scheme B-doped N-deficient C_(3)N_(4)/O-doped-C_(3)N_(5) for efficient photocatalytic overall water splitting

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Chinese Chemical Letters 2025年第1期36卷 355-361页

作者： Entian Cui Yulian Lu Zhaoxia Li Zhilei Chen Chengyan Ge Jizhou Jiang Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province Yancheng Institute of TechnologyYancheng 224051China School of Environmental Ecology and Biological Engineering Key Laboratory of Green Chemical Engineering Process of Ministry of EducationEngineering Research Center of Phosphorus Resources Development and Utilization of Ministry of EducationWuhan Institute of TechnologyWuhan 430205China

Photocatalytic overall pure water splitting is a promising method for generating green hydrogen energy under mild ***,this process is often hindered by sluggish electron-hole separation and *** address this,a step-scheme(S-scheme)B-doped N-deficient C_(3)N_(4)/O-doped C_(3)N_(5)(BN-C_(3)N_(4)/O-C_(3)N_(5))heterojunction with interfacial B-O bonds has been *** Pt and Co(OH)_(2) as co-catalysts,BN-C_(3)N_(4)/O-C_(3)N_(5) S-scheme heterojunction demonstrates significantly enhanced photocatalytic activity for overall pure water splitting under visible light,achieving H_(2) and O_(2) evolution rates of 40.12 and 19.62μmol/h,*** characterizations and experiments revealed the performance-enhancing effects of the enhanced built-in electric field and the interfacial B-O ***,the strengthened built-in electric field provides sufficient force for rapid interfacial electron ***,by reducing the transport energy barrier and transfer distance,the interfacial B-O bonds facilitate rapid recombination of electrons and holes with relatively low redox potential via the S-scheme charge-transfer route,leaving the high-potential electrons and holes available for H^(+)reduction and OH^(-)oxidation ***,the photocatalytic efficiency of BN-C_(3)N_(4)/O-C_(3)N_(5) S-scheme heterojunction was significantly improved,making it a promising approach for green hydrogen production through overall pure water splitting.

关键词： Interfacial B-O bonds BN-C_(3)N_(4) O-C_(3)N_(5) S-scheme heterojunction Water splitting

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Omnidirectionally impedance-matched phononic crystals for full-parameter transformation acoustics

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Science China(Physics,Mechanics & Astronomy) 2025年第5期68卷 16-21页

作者： Chenkai Liu Jie Luo Xiaozhou Liu Yun Lai MOE Key Laboratory of Modern Acoustics National Laboratory of Solid State MicrostructuresSchool of Physicsand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China School of Physical Science and Technology&Jiangsu Key Laboratory of Frontier Material Physics and Devices Soochow UniversitySuzhou 215006China State Key Laboratory of Acoustics Institute of AcousticsChinese Academy of SciencesBeijing 100190China

In this work,we present an approach to realize full-parameter transformation acoustic media utilizing phononic crystals instead of metamaterials,which has the exceptional advantages of omnidirectional impedance matching and configurable dispersion *** employing a sandwich structure,we demonstrate phononic crystals that exhibit tunable shifted elliptical equal frequency contours and nearly omnidirectional impedance matching *** typical acoustic devices,including a beam shifter and an illusionary scatterer of different size,are demonstrated with the phononic crystal *** work provides a practical platform for implementing full-parameter transformation acoustics,opening avenues for versatile applications such as advanced acoustic imaging and stealth technologies.

关键词： phononic crystals transformation acoustics omnidirectional impedance matching configurable dispersion surfaces

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Spatially confined synthesis of TiNb_(2)O_(7)quantum dots onto mesoporous carbon and Ti_(3)C_(2)T_(X)MXene for boosting lithium storage

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Green Energy & Environment 2025年第2期10卷 358-366页

作者： Daoguang Sun Cheng Tang Haitao Li Xinlin Zhang Guanjia Zhu Zhen-Dong Huang Aijun Du Haijiao Zhang Institute of Nanochemistry and Nanobiology School of Environmental and Chemical EngineeringShanghai UniversityShanghai200444China School of Chemistry and Physics and Centre for Materials Science Queensland University of TechnologyBrisbaneQLD4001Australia State Key Laboratory for Organic Electronics and Information Displays&Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials(IAM)Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)Nanjing University of Posts and Telecommunications9 Wenyuan RoadNanjing210023China

TiNb_(2)O_(7)has been emerged as one of the most promising electrode materials for high-energy lithium-ion ***,limited by the slow electron/ion transport kinetics,and insufficient active sites in the bulk structure,the TiNb_(2)O_(7)electrode still suffers from unsatisfactory lithium storage ***,we demonstrate a spatially confined strategy toward a novel TiNb_(2)O_(7)-NMC/MXene composite through a triblock copolymer-directed one-pot solvothermal route,where TiNb_(2)O_(7)quantum dots with a particle size of 2-3 nm are evenly embedded into N-doped mesoporous carbon(NMC)and Ti_(3)C_(2)T_(X)***,the as-prepared TiNb_(2)O_(7)-NMC/MXene anode exhibits a high reversible capacity(486.2 mAh g^(-1)at 0.1 A g^(-1)after 100 cycles)and long cycle lifespan(363.4 mAh g^(-1)at ss1 A g^(-1)after 500 cycles).Both experimental and theorical results further demonstrate that such a superior lithium storage performance is mainly ascribed to the synergistic effect among 0D TiNb_(2)O_(7)quantum dots,2D Ti_(3)C_(2)T_(X)MXene nanosheets,and N-doped mesoporous *** strategy presented also opens up new horizon for space-confined preparation of high-performance electrode materials.

关键词： TiNb_(2)O_(7)quantum dots Ti_(3)C_(2)T_(X)MXene Mesoporous carbon Confined synthesis Lithium-ion batteries

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15.13%Sr-doped CsPbI_(3) quantum dots with near-unity quantum yield via surface ligand compensation

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Nano Research 2025年第4期18卷 534-543页

作者： Yi Peng Wanzhong Gu Yuhui Dong Yucong Ji Danni Yan Ziyun Lin Li Zhang Yousheng Zou Haibo Zeng MIIT Key Laboratory of Advanced Display Materials and Devices Jiangsu Province Engineering Research Center of Quantum Dot DisplaySchool of Materials Science and EngineeringInstitute of Optoelectronics and NanomaterialsNanjing University of Science and TechnologyNanjing 210094China

Sr-doping of perovskite quantum dots(QDs)is a promising strategy to reduce Pb content and improve optical performance and ***,excessive Sr introduces new defects that degrade photoluminescence quantum yield(PLQY).Therefore,it is a challenge to balance high optical performance with high doping concentration for the preparation of environmentally friendly perovskite *** this study,we report the highest Sr/Pb ratios Sr-doped CsPbI_(3) QDs(15.13%)with a near-unity *** balance between high PLQY and high Sr-doping rate is achieved through the introduction of oleylammonium iodide(OAmI)ligand compensation during the anti-solvent purification process,which can form an iodine-enriched environment and effectively passivates the surface defects of QDs caused by excessive ***,the Sr-doped CsPbI_(3) QDs exhibit superior stability in environments with high temperature and humidity or direct contact with *** strategy provides a novel approach for the preparation of lead-less and lead-free QDs with superior optical performance and stability,offering a potential solution for environmentally friendly applications.

关键词： CsPbI_(3)quantum dots Sr-doping ligand compensation photoluminescence quantum yield environmental stability

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