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Single copper sites dispersed on hierarchically porous carbon for improving oxygen reduction reaction towards zinc-air battery

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Nano Research 2021年第4期14卷 998-1003页

作者： Wenjie Wu Yan Liu Dong Liu Wenxing Chen Zhaoyi Song Ximin Wang Yamin Zheng Ning Lu Chunxia Wang Junjie Mao Yadong Li State Key Laboratory of Heavy Oil Processing College of New Energy and MaterialsChina University of PetroleumBeijing 102249China Key Laboratory of Functional Molecular Solids Ministry of EducationAnhui Province Key Laboratory of Optoelectric Materials Science and Technology and Anhui Laboratory of Molecule-Based MaterialsAnhui Normal UniversityWuhu 241002China State key Lab of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Department of Chemistry Tsinghua UniversityBeijing 100084China

The demand for high-performance non-precious-metal electrocatalysts to replace the noble metal-based catalysts for oxygen reduction reaction(ORR)is intensively ***,single-atomic copper sites supported on N-doped three-dimensional hierarchically porous carbon catalyst(Cu_(1)/NC)was prepared by coordination pyrolysis ***,the Cu_(1)/NC-900 catalyst not only exhibits excellent ORR performance with a half-wave potential of 0.894 V(***)in alkaline media,outperforming those of commercial Pt/C(0.851 V)and Cu nanoparticles anchored on N-doped porous carbon(CuNPs/NC-900),but also demonstrates high stability and methanol ***,the Cu_(1)/NC-900 based Zn-air battery exhibits higher power density,rechargeability and cyclic stability than the one based on Pt/*** experimental and theoretical investigations demonstrated that the excellent performance of the as-obtained Cu_(1)/NC-900 could be attributed to the synergistic effect between copper coordinated by three N atoms active sites and the neighbouring carbon defect,resulting in elevated Cu d-band centers of Cu atoms and facilitating intermediate desorption for ORR *** study may lead towards the development of highly efficient non-noble metal catalysts for applications in electrochemical energy conversion.

关键词： single atomic sites catalysts nitrogen-doped carbon materials oxygen reduction reaction carbon defect non-noble metal

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Performance Regulation of Desulfurized Gypsum on Solid Waste-Based Road Base Materials: Hydration Characteristics and Environmental Performance

SSRN

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SSRN 2024年

作者： Wu, Pengfei Wei, Chao Liu, Xiaoming Zhang, Zengqi Liu, Xinyue Ma, Shanliang Xue, Yu State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing Beijing100083 China School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing100083 China

Industrial zones contribute to economic development but also produce substantial amounts of industrial solid waste, which poses significant disposal challenges. These wastes not only impede regional development but also harm the ecological environment. In response to these challenges, this study utilized solid waste from aluminum oxide plants, power plants, coal washing plants, and steel mills—specifically red mud, desulfurization gypsum (DG), fly ash, coal gangue, and blast furnace slag—to prepare solid waste-based road base materials (SWB). The paper reveals the regulatory patterns and mechanisms of DG on the mechanical performance, durability, and environmental properties of SWB. The results indicate that DG not only enhances the hydration exothermic rate and total heat release of SWB but also improves its heavy metal immobilization capacity. When the SO3 content is between 2.06-2.93%, the C/S (mass ratio of Ca to Si) falls within 0.72 to 0.75 and the S/A (mass ratio of Si to Al) ranges from 1.31 to 1.32, SWB exhibits a higher degree of polymerization, accompanied by a compressive strength of 7.1-9.1 MPa at 7 days and heavy metal comprehensive solidification rate exceeding 80%. SWB’s application provides a novel approach for the sustainable development of industrial zones. © 2024, The Authors. All rights reserved.

关键词： Sustainable development

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Rechargeable quasi-solid-state aqueous hybrid Al^(3+)/H^(+) battery with 10,000 ultralong cycle stability and smart switching capability

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Nano Research 2021年第11期14卷 4154-4162页

作者： Hua Wang Panpan Wang Zhenyuan Ji Zhe Chen Jiaqi Wang Wei Ling Jie Liu Mengmeng Hu Chunyi Zhi Yan Huang State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyShenzhen518055China Flexible Printed Electronic Technology Center Harbin Institute of TechnologyShenzhen518055China School of Materials Science and Engineering City University of Hong KongHong Kong999077China School of Materials Science and Engineering Harbin Institute of TechnologyShenzhen518055China

Safe and long lifespan batteries facilitate the development of portable electronics and electric *** to the low-cost,naturally abundance,and trivalent charge carrier of aluminum with the highest theoretical volumetric capacity,rechargeable aqueous aluminum-ion-based batteries are considered as promising next-generation secondary ***,traditional electrolytes and frequent collapse of the host structure of electrode materials greatly jeopardize the cycle stability of the ***,we develop a novel hydrogel-based electrolyte coupled with stable layered intercalation electrodes for the first time to fabricate a highly safe and flexible rechargeable hybrid Al^(3^(+))/H^(+)*** as-fabricated hybrid-ion battery(HIB)delivers a high specific capacity of 125 mAh·g^(−1) at 0.1 A·g^(−1) and exhibits an unprecedented super long-term cycling stability with no capacity fading over 10,000 cycles at 2 A·g^(−1).In addition,the hydrogel-based electrolyte possesses smart function of thermoresponsive switching,which can effectively prevent thermal runaway for the *** unprecedented long cycle stability,highly intrinsic safety as well as low-cost indicate that the flexible aqueous HIBs are promising for applications.

关键词： hybrid-ion batteries hydrogel electrolyte long lifespan safety thermoresponsive

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A novel HfNbTaTiV high-entropy alloy of superior mechanical properties designed on the principle of maximum lattice distortion

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Journal of Materials Science & technology 2021年第20期79卷 109-117页

作者： Zibing An Shengcheng Mao Yinong Liu Li Wang Hao Zhou Bin Gan Ze Zhang Xiaodong Han Beijing Key Lab of Microstructure and Property of Advanced Materials Faculty of Materials and ManufacturingBeijing University of TechnologyBeijing100124China Department of Mechanical Engineering The University of Western AustraliaPerthWA6009Australia Nano and Heterogeneous Structural Materials Center School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing210094China Beijing Key Laboratory of Advanced High Temperature Materials Central Iron and Steel Research InstituteBeijing100081China State Key Laboratory of Silicon Materials Department of Materials Science and EngineeringZhejiang UniversityHangzhou310058China

This paper reports a synergistic design of high-performance BCC high-entropy alloy based on the combined consideration of the principles of intrinsic ductility of elements,maximum atomic size difference for solid solution strengthening and the valence electron concentration criterion for *** single-phase BCC HfNbTaTiV alloy thus designed exhibited a high compressive yield strength of 1350 MPa and a high compressive ductility of>45%at the room *** represents a 50%increase in yield strength relative to a HfNbTaTiZr *** is attributed to the maximized solid solution strengthening effect caused by lattice distortion,which is estimated to be 1094 *** alloy was also able to retain 53%of its yield strength and 77%of its ductility at 700℃.These properties are superior to those of most refractory BCC high-entropy alloys reported in the literature.

关键词： High-entropy alloy Solid solution strengthening Strengthening mechanism Mechanical properties

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Fine Tune or not? Evaluation of Transfer Methods for Power System Transient Stability Analysis

Fine Tune or not? Evaluation of Transfer Methods for Power S...

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International Conference on Power System technology (POWERCON)

作者： Zhouping Li Wei Yao Yanhao Huang Zhongtuo Shi Yong Tang Jinyu Wen State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781665407380

Many methods based on deep learning (DL) have been developed to handle the power system stability analysis problem with satisfactory results. A well-trained DL model on the source domain may encounter the performance reduction problem when applied to a target domain of different distributions. Thus, transfer learning is needed to transfer knowledge learned from the source domain to the target domain which can reduce the cost of collecting more data and labels. As a commonly used scheme, fine-tuning is thought to be able to share the ability to extract high-level features to the target model by reusing the parameters of the pretrained model. Several fine-tune schemes are compared to evaluate the benefits brought by fine-tuning. The results show that freezing the layers of the DL model may restrict the tuning process in terms of convergence speed and test accuracy. A simple but effective mixed dataset training scheme is demonstrated to work better than fine-tune schemes.

关键词： Training Deep learning Analytical models Simulation Transfer learning Power system stability Feature extraction

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Motion Stability Analysis of Grid-connected VSC Systems under Weak Connection Conditions

Motion Stability Analysis of Grid-connected VSC Systems unde...

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Energy, Electrical and Power engineering (CEEPE), International Conference on

作者： Yuxi Liu Feng Ji Jie Du Chang Lin Lu Gao Heming Yan School of Electric Power Engineering South China University of Technology Guangzhou China State Key Laboratory of Advanced Transmission Technology Beijing China School of Electrical Engineering Xi'an Jiaotong University Xi’an China

ISBN: (数字)9798350375794

ISBN: (纸本)9798350375800

A grid-connected voltage source converter (VSC) system may suffer from instability problem when the connection is weak. In order to ensure the safety and stability of the power grid, it is necessary to analyze the stability of grid-connected VSC system under weak connection conditions. This paper first establishes a dynamic model of grid-connected VSC system based on Lagrange dynamics, which can be numerically calculated and analyzed. Secondly, the stability of the grid-connected VSC system is analyzed by using the Lyapunov first stability criterion. Finally, the Simlink simulation is used to verify the motion stability analysis results. The results show that the method of this paper can effectively calculate the oscillation frequency of the grid-connected VSC system, and is suitable for the stability analysis when the operating point changes.

关键词： Analytical models Stability criteria Power system dynamics Dynamics Power system stability Mathematical models Numerical models

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A Platinum Complex-Based Dimerized Electron Acceptor for Efficient Organic Solar Cells

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advanced Energy Materials 2025年第0期15卷

作者： Cheng, Yang Jiang, Dongcheng Xiao, Chengyi Li, Mengdi Lin, Yi Zhao, Chaowei Tang, Zheng Yin, Hang Li, Weiwei Beijing Advanced Innovation Center for Soft Matter Science and Engineering & State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical Technology Beijing100029 China School of Physics State Key Laboratory of Crystal Materials Shandong University Jinan250100 China Institute of Applied Chemistry Jiangxi Academy of Sciences Nanchang330096 China State Key Laboratory for Medication of Chemical Fibers and Polymer Materials Center for Advanced Low-dimension Materials College of Materials Science and Engineering Donghua University Shanghai201620 China

Metal–organic complexes have demonstrated excellent performance in organic light-emitting diodes, yet their potential in organic solar cells (OSCs) remains underexplored. In this study, a novel metal–organic complex, Pt-Y, which features a platinum core connected to Y-acceptor arms, for application in OSCs is designed and synthesized. The dimerized Pt-Y acceptor is prepared through straightforward reactions, with the key precursor linking the platinum metal and Y-acceptors synthesized through Sonogashira coupling. Steady-state and transient photoluminescence measurements revealed that Pt-Y exhibits distinct singlet and triplet states with microsecond lifetimes—significantly longer than the nanosecond lifetimes of Y-acceptors without the metal. Incorporating Pt-Y as a third component in ternary OSCs has resulted in a remarkable efficiency of 19.2%. Further morphological analysis and transient absorption measurements indicate that the dimerized Pt-Y displays excellent miscibility with the Y-acceptor, leading to minimal phase separation and the formation of fibrillar structures. These structures enhance charge separation and transport while reducing charge recombination. This work presents a facile approach to developing metal–organic complexes with exceptional photovoltaic performance in OSCs. © 2025 Wiley-VCH GmbH.

关键词： Organic light emitting diodes (OLED)

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Investigation on microstructure and mechanical properties of Al-Zn-Mg-Cu alloys with various Zn/Mg ratios

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Journal of Materials Science & technology 2021年第26期85卷 106-117页

作者： Yan Zou Xiaodong Wu Songbai Tang Qianqian Zhu Hui Song Mingxing Guo Lingfei Cao International Joint Laboratory for Light Alloys(Ministry of Education) College of Materials Science and EngineeringChongqing UniversityChongqing400044China State Key Laboratory for Advanced Metals and Materials University of Science and TechnologyBeijing100083China Shenyang National Laboratory for Materials Science Chongqing UniversityChongqing400044China

The effects of Zn/Mg ratios on microstructure and mechanical properties of Al-Zn-Mg-Cu alloys aged at 150℃have been investigated by using tensile tests,optical metallography,scanning electron microscopy,transmission electron microscopy and atom probe tomography *** increasing Zn/Mg ratios,the ageing process is significantly accelerated and the time to peak ageing is reduced.T’phase predominates in alloys of lower Zn/Mg ratios whileη’phase predominates in alloys with a Zn/Mg ratio over ***-existence of T’phase andη’phase with a large number density is beneficial to the high strength of *** precipitates together with narrow precipitate free zones cause a brittle intergranular fracture.A strength model has been established to predict the co-strengthening effect of T’phase andη’phase in Al-Zn-Mg-Cu alloys,including the factors of the grain boundary,solid solution and precipitation.

关键词： Al-Zn-Mg-Cu alloys Zn/Mg ratio Microstructure Strength model

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Scalable Multilayered Dielectric Polymer Film Exhibiting Significantly Improved High-Temperature Energy Density

SSRN

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SSRN 2024年

作者： Li, Shuxuan Qu, Jie Wang, Jian Li, Xinhui Dai, Xingyao Jiang, Yanda Shen, Zhonghui Li, Bao-Wen Zhang, Xin State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and Devices International School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China

Dielectric polymers, serving as crucial dielectric media in high-power-density energy storage devices, play a pivotal part in modern industries and electrical systems. However, the rapid degradation of breakdown strength and charge-discharge efficiency in elevated temperature environment imposes formidable limitations on the utilization of polymer dielectric under extreme conditions. Here, a series of polyetherimide/polysulfone alternating multilayer composite films are prepared using a non-equilibrium processing method, which effectively blocks the development of breakdown paths by the interface barriers in the multilayer structure. The deep trap sites within the interface capture the charge carriers excited at high temperatures, thus decreasing conduction loss and enhancing the efficiency and breakdown field strength of the dielectric polymer. Consequently, excellent capacitive performances including a high energy density of 5.4 J cm-3 with an efficiency exceeding 90% at 200 °C and cycle stability up to 106 cycles have been obtained. Furthermore, the multilayer polymer capacitors (MLPC) constructed from composite films also exhibit significant flexibility and thermal stability. This work provides valuable insights for the advancement of high-temperature energy storage polymers with commercial application value. © 2024, The Authors. All rights reserved.

关键词： Energy storage

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From a design strategy for metamaterial sensors to interdigitated metamaterial sensors

From a design strategy for metamaterial sensors to interdigi...

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International Conference on Infrared and Millimeter Waves

作者： Lei Cao Fanqi Meng Yannik Loth Merle Richter Anna Katharina Wigger Maira Pérez Sosa Alaa Jabbar Jumaah Shihab Al-Daffaie Peter Haring Bolívar Hartmut G. Roskos State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology Wuhan China Physikalisches Institute Goethe-Universität Frankfurt Frankfurt am Main Germany Institute for High Frequencies and Quantum Electronics University of Siegen Siegen Germany Department of Electrical Engineering Eindhoven University of Technology AE Eindhoven Netherlands

ISBN: (数字)9798350370324

ISBN: (纸本)9798350370331

We present a strategy for the design of metamaterial sensors to be used for detecting small amounts of dielectric materials by the shift of the metamaterial’s resonance frequency. The amount of frequency shift depends on intrinsic properties (electric field distribution, Q-factor, and mode volume) of the metamaterial’s bare resonators, as well as the overlap volume of its high-electric-field zone(s) and the analyte. Guided by the simplified dielectric perturbation theory, interdigitated electric split-ring resonators (ID-eSRR) are devised to significantly enhance the detection sensitivity compared to eSRRs without interdigitated fingers. The ID-eSRR's fingers redistribute the electric field, creating strongly localized field enhancement which boosts interaction with the analyte. Furthermore, the periodic change of field direction in the region of the interdigitated fingers significantly reduces radiation loss, leading to a higher Q-factor. Experiments with ID-eSRR sensors operating at around 300 GHz demonstrate a remarkable 33.5-GHz frequency shift upon deposition of a 150-nm-thick SiO 2 layer as an analyte simulant, with a figure of merit (FOM) improvement of over 50 times compared to structures without interdigitated fingers. This rational design offers a promising avenue for the development of highly sensitive detectors of thin dielectric films and trace amounts of biomolecules.

关键词： Q-factor Silicon compounds Time-frequency analysis Sensitivity Fingers Resonant frequency Metamaterials Sensors Resonators Electric fields

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