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Hierarchical NiFe LDH/N-doped Co/nickel foam as highly active oxygen evolution reaction electrode for anion exchange membrane water electrolysis

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Nano research 2025年第2期18卷 280-289页

作者： Jiansheng Wang Yongsheng Wang Xiaoxuan Guo Mengting Chen Jinjie Fang Xiaojie Li Wei Zhu Zhongbin Zhuang State Key Lab of Organic-Inorganic Composites and Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China Beijing Key Laboratory of Energy Environmental Catalysis Beijing University of Chemical TechnologyBeijing 100029China PetroChina Shenzhen New Energy Research Institute Co. Ltd.Shenzhen 518054China

Anion exchange membrane water electrolyzers(AEMWEs)are emerging as a promising technology due to the high performance and low ***,the development of highly active and stable non-precious metal-based catalysts for the anodic oxygen evolution reaction(OER)remains a great *** this study,we present a top-down construction strategy for anode design,resulting in a hierarchical NiFe layered double hydroxide(LDH)/N-doped Co/nickel foam(NF)electrode synthesized via a hydrothermal-gas phase nitridation–electrodeposition *** electrode features NiFe LDH nanoplates grown on N-doped Co nanowires supported by nickel foam *** NiFe LDH/N-doped Co/NF electrode demonstrates exceptional performance,achieving a current density of 100 mA·cm^(-2) at a low overpotential of 262 mV with minimal attenuation of just 7 mV NiFe LDH/N-doped Co/NF RuO_(2)/NF NiFe LDH/N-doped Co/NF after 100 h of *** assembled into an AEMWE,the system requires only 1.63 V to achieve a current density of 1 A·cm^(-2),surpassing the performance of most reported *** N-doped Co nanowires are shown to enhance both activity and stability by increasing the electrode’s surface area and reinforcing the catalyst–support interaction.

关键词： water electrolysis oxygen evolution reaction hierarchical structure synergistic effect

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Design and optimization of the composition and mechanical properties for non-equiatomic CoCrNi medium-entropy alloys

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Journal of Materials science & technology 2023年第8期139卷 232-244页

作者： J.X.Yan Z.J.Zhang P.Zhang J.H.Liu H.Yu Q.M.Hu J.B.Yang Z.F.Zhang Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering Chongqing Jiaotong UniversityChongqing 400074China chool of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China School of Materials Science and Engineering Northeastern UniversityShenyang 110819China School of Information Science and Engineering Shenyang University of TechnologyShenyang 111003China

The development of multi-principal element alloys(MPEAs,also called as high-or medium-entropy al-loys,HEAs/MEAs)provides tremendous possibilities for materials ***,designing MPEAs with desirable mechanical properties confronts great challenges due to their vast composition *** this work,we provide an essential criterion to efficiently screen the CoCrNi MEAs with outstanding strength-ductility *** negative Gibbs free energy difference△E_(FCC-BCC)between the face-centered cubic(FCC)and body-centered cubic(BCC)phases,the enhancement of shear modulus G and the decline of stacking fault energy(SFE)γ_(isf)are combined as three requisites to improve the FCC phase stability,yield strength,deformation mechanisms,work-hardening ability and ductility in the *** effects of chemical composition on△E_(FCC-BCC),G andγisf were investigated with the first principles calculations for Co_(x)Cr_(33)Ni_(67-x),Co_(33)Cr_(y)Ni_(67-y)and Co_(z)Cr_(66-z)Ni_(34)(0≤x,y≤67 and 0≤z≤66)*** on the essential criterion and the calculation results,the composition space that displays the neg-ative Gibbs free energy difference△E_(FCC-BCC),highest shear modulus G and lowest SFEγ_(isf)was screened with the target on the combination of high strength and excellent *** this context,the optimal composition space of Co-Cr-Ni alloys was predicted as 60 at.%-67 at.%Co,30 at.%-35 at.%Cr and 0 at.%-6 at.%Ni,which coincides well with the previous experimental evidence for Co_(55)Cr_(40)Ni_(5)*** valid-ity of essential criterion is further proved after systematic comparison with numerous experimental data,which demonstrates that the essential criterion can provide significant guidance for the quick exploitation of strong and ductile MEAs and promote the development and application of MPEAs.

关键词： Medium-entropy alloys First-principles calculations Phase stability Stacking-fault energy Strength Ductility

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Study on crab-cavity-based longitudinal injection scheme and prototype realization of C-band crab cavity for electron storage rings

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Nuclear science and Techniques 2023年第7期34卷 137-147页

作者： Guan-Hua Wang Bo-Cheng Jiang Jian-Hao Tan Qing-Lei Zhang Wen-Cheng Fang Chang-Liang Li Kun Wang Xiao-Xia Huang Sheng-Li Pu University of Shanghai for Science and Technology Shanghai 200093China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China Laboratory for Ultrafast Transient Facility Chongqing UniversityChongqing 401331China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201204China

A diffraction-limited storage ring with a multi-bend achromat lattice suffers from a small dynamic aperture for conventional off-axis ***,a longitudinal on-axis injection scheme based on a new type of crab cavity is proposed in this *** tracking simulations were performed to study the disturbance of the stored beam and the motion of the injected beam during the injection *** possibility of multi-bunch injections was *** addition,the effect of the long-range wake field induced by the stored beam was analyzed.A C-band standing-wave crab cavity was designed and produced as requested,and its field distribution was *** corresponding results are consistent with the simulation results.

关键词： On-axis injection Crab cavity Bump orbit Wakefield

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Compositional design and phase formation capability of high-entropy rare-earth disilicates from machine learning and decision fusion

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npj Computational Materials 2024年第1期10卷 2257-2271页

作者： Yun Fan Yuelei Bai Qian Li Zhiyao Lu Dong Chen Yuchen Liu Wenxian Li Bin Liu National Key Laboratory of Science and Technology on Advanced Composites in Special Environments and Center for Composite Materials and Structure Harbin Institute of TechnologyHarbin 150080China School of Materials Science and Engineering Shanghai UniversityShanghai 200444China National Engineering Research Center for Magnesium Alloy Chongqing UniversityChongqing 400044China School of Electronics and Information Engineering Harbin Institute of TechnologyHarbin 150080China UNSW Materials&Manufacturing Futures Institute School of Materials Science and EngineeringUniversity of New South WalesSydney NSW 2052Australia Institute of Coating Technology for Hydrogen Gas Turbines Liaoning Academy of MaterialsShenyang 110004China

A key strategy for designing environmental barrier coatings is to incorporate multiple rare-earth(RE)components intoβ-andγ-RE_(2)Si_(2)O_(7)to achieve multifunctional performance ***,the polymorphic phase presents s... 详细信息

关键词： rare earth silicate

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Experimental and numerical efforts to improve oxygen mass transport in porous catalyst layer of proton exchange membrane fuel cells

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Nano research Energy 2023年第4期2卷 23-40页

作者： Zhaojing Ni Kai Han Xianchun Chen Lu Wang Bo Wang Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials Key Laboratory of Cluster ScienceMinistry of EducationFrontiers Science Center for High Energy MaterialAdvanced Technology Research Institute(Jinan)School of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 100081China Beijing Institute of Technology Chongqing Innovation Center Beijing Institute of TechnologyChongqing 401120China

The effective management of oxygen transport resistance(OTR)within the cathode catalyst layer(CCL)is crucial for achieving a high catalyst performance at low platinum(Pt)*** the past two decades,significant advancements have been made in the development of various high active platinum-based catalysts,aiming at enhancing oxygen mass transport and the oxygen reduction reaction(ORR).However,experimental investigations of transport processes in porous media are often computational costs and restrained by limitations in in-situ measurement capabilities,as well as spatial and temporal ***,numerical simulation provides a valuable alternative for unveiling the intricate relationship between local transport properties and overall cell performance that remain unresolved or uncoupled through experimental *** this review,we elucidate the primary experimental and numerical efforts undertaken to improve *** consolidate the available literature on OTR values and perform a quantitative comparison of the effectiveness of different strategies in mitigating ***,we analyze the intrinsic limitations and challenges associated with current experimental and numerical ***,we outline future prospect for advancements in both experimental techniques and modelling methods.

关键词： porous media catalyst layer mass transport high-performance fuel cells

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research progress of different printing techniques based on Ln3+ ions doped up-conversion fluorescence ink

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Journal of Rare Earths 2025年第7期43卷 1303-1317页

作者： Wang, Keke Fan, Haihan Fan, Lanlan Liu, Jianfeng Yang, Liuyimei Xiong, Shixian Liu, Baixiong School of Materials Science and Engineering Jiangxi University of Science and Technology Ganzhou341000 China Laboratory of Advanced Materials and Manufacturing International Institute for Innovation Jiangxi University of Science and Technology Nanchang330013 China National Engineering and Research Center of Continuous Casting Technology Central Iron and Steel Research Institute Beijing100081 China Xinyu Iron and Steel Group Co. Ltd. Xinyu336600 China Ganjiang Innovation Academy Chinese Academy of Sciences Ganzhou341119 China

Up-conversion (UC) luminescent materials doped with Ln3+ ions possess excellent optical properties and extensive applications in the formulation of multifunctional fluorescence ink. Printing technology offers various methods for the preparation of UC fluorescent inks. This study introduced the optical properties of luminescent materials doped with Ln3+ ions, including luminescence characteristics and spectral characteristics, which provide a basis for the subsequent printing process. We also reviewed different printing techniques, including direct writing, screen printing, laser printing, inkjet printing, and aerosol jet printing (AJP), developed so far in the literature and explored the printing process of ink characteristics. However, the printing process of inks was explored and their potential for various applications was maximized. Therefore, the printing technology of UC fluorescent inks still faces challenges in different aspects. This review also points out the direction for future in-depth research, which is expected to promote further development and innovation in the field. © 2024 Chinese Society of Rare Earths

关键词： Screen printing

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Optimizing Semantic Joinability in Heterogeneous Data: A Triplet-Based Approach with Pre-trained Deep Learning Models

Optimizing Semantic Joinability in Heterogeneous Data: A Tri...

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2024 IEEE International Conference on Big Data, BigData 2024

作者： Pedersen, Magnus Guldberg Fazal, Benjamin Kock Kim, Kyoung-Sook Technical University of Denmark Dtu Compute Kongens Lyngby Denmark National Institute of Advanced Industrial Science and Technology Artificial Intelligence Research Center Tokyo Japan

ISBN: (纸本)9798350362480

This paper presents a novel approach to optimizing semantic joinability in heterogeneous data, leveraging embedding techniques and deep learning in the context of big data environments. We propose two distinct embedding strategies: a text-based approach using DistilBERT and an image-based approach utilizing ResNet50, both fine-tuned using a triplet data structure and circle loss functions to enhance joinability predictions from data lakes. By transforming tabular data into semantic embeddings, our method facilitates more effective integration of large, diverse datasets. Experiments conducted on large-scale datasets show that the fine-tuned models significantly outperform baseline approaches in accuracy and robustness. Furthermore, incorporating computer vision techniques via the image-based method demonstrates the versatility of embedding strategies across different data types. The results suggest that pre-trained models, when fine-tuned for specific joinability tasks, can provide a scalable and efficient solution for extensive data integration. Future work will explore expanding this approach to additional data modalities and optimizing model performance in large-scale applications. © 2024 IEEE.

关键词： big data deep learning feature representation learning fine-tuning tabular data

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First commissioning results of the coherent scattering and imaging endstation at the Shanghai soft X-ray free-electron laser facility

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Nuclear science and Techniques 2022年第9期33卷 48-58页

作者： Jia-Dong Fan Ya-Jun Tong Yong-Gan Nie Zi-Chen Gao Bo He Hui Luan Dong-Hao Lu Jian-Hua Zhang Di-Fei Zhang Xin-Ye Yuan Jia-Hua Chen Zhi Guo Tao Liu Meng Zhang Chao Feng Hai-Xiao Deng Bo Liu Zhen-Tang Zhao Zhi Liu Huai-Dong Jiang Center for Transformative Science ShanghaiTech UniversityShanghai 201210China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China

The Shanghai soft X-ray free-electron laser(SXFEL)user facility project started in 2016 and is expected to be open to users by *** aims to deliver ultra-intense coherent femtosecond X-ray pulses to five endstations covering a range of 100–620 eV for ultrafast X-ray *** undulator lines are designed and constructed,based on different lasing modes:self-amplified spontaneous emission and echo-enabled harmonic *** coherent scattering and imaging(CSI)endstation is the first of five endstations to be commissioned *** focuses on high-resolution single-shot imaging and the study of ultrafast dynamic processes using coherent forward scattering *** the single-shot holograms and coherent diffraction patterns were recorded and reconstructed for nanoscale imaging,indicating the excellent coherence and high peak power of the SXFEL and the possibility of‘‘diffraction before destruction’’experiments at the CSI *** this study,we report the first commissioning results of the CSI endstation.

关键词： X-ray free electron laser Coherent diffraction imaging Fourier transform holography Single-shot imaging Phase retrieval

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Scenario Generation Based on a Gaussian Mixture Model for the Stochastic Optimization of Crowd Control 27

Scenario Generation Based on a Gaussian Mixture Model for th...

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27th IEEE International Conference on Intelligent Transportation Systems, ITSC 2024

作者： Niwa, Ryo Takami, Shunki Shigenaka, Shusuke Onishi, Masaki University of Tsukuba Ibaraki305-0005 Japan National Institute of Advanced Industrial Science and Technology Artificial Intelligence Research Center Tsukuba305-8568 Japan

ISBN: (纸本)9798331505929

Several people moving simultaneously after a large-scale event can cause massive congestion, and thus far, crowd control methods such as route guidance and allocation to the destination have been employed as valid countermeasures to relieve the massive congestion. Onsite guides aid in crowd-control operations, and previous studies reported that incorporating crowd simulation and stochastic optimizations for considering uncertainty can help achieve crowd control adaptable to any scenario. Increasing the number of measured scenarios used for stochastic optimization can improve the robustness of the optimal solutions;however, the high cost of measuring scenarios, such as crowd flow, prevents securing a sufficient number of measured scenarios. Although various scenario-generation methods have been proposed to duplicate the measured scenarios, adapting stochastic optimization is impossible because of the specialized development of scenario generation required for each field. Therefore, a scenario generation based on a Gaussian mixture model is proposed in this paper for the stochastic optimization of crowd control. The proposed method achieves robust crowd control with a small number of measured scenarios, which was previously impossible without a sufficient number of measured scenarios. Experiments validated the performance of robust control in stochastic optimization with and without the proposed method. © 2024 IEEE.

关键词： Stochastic control systems

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A facile and green strategy to obtain organic room-temperature phosphorescence from natural lignin

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science China Chemistry 2022年第6期65卷 1100-1104页

作者： Ruihong Liu Tao Jiang Dongzhi Liu Xiang Ma School of Chemical Engineering and Technology Collaborative Innovation Center of Chemical Science and EngineeringTianjin Engineering Research Center of Functional Fine ChemicalsTianjin UniversityTianjin300354China Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center Frontiers Science Center for Materiobiology and Dynamic ChemistrySchool of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai200237China

Seeking pure organic functional luminescent materials that are processed from green, low-cost, and sustainable resources remains a challenging but beneficial task. As an abundant natural polymer composed of crosslinked phenol ether units, lignin is a potential source of organic luminescent material because of the presence of extensive aromatic fragments. In the present work, a remarkable afterglow involving room-temperature phosphorescence(RTP) was achieved via simply embedding alkalized lignin into polyvinyl alcohol(PVA) matrix, and an ultralong luminescence lifetime of more than 160 ms was observed. More importantly, our study revealed that small fragments of hydrolyzed lignin(named LA-H) bearing extensive phenolic oxygen anions were the effective luminescent species. When embedded into a PVA matrix, LA-H showed remarkably high luminescence quantum yield and long lifetime of RTP emission compared with those of unprocessed lignin. Additionally, the various phenol oxygen anion moieties endowed LA-H with an excitation-dependent characteristic: the color-tunable RTP could be simply tuned from a maximum emission wavelength of 434–532 nm via altering the excitation wavelength. Thus, the color-tunable afterglow of emissive LA-H could be facilely obtained with a yield up to 38.4% using simple acid hydrolysis of lignin without other complex synthesis procedures. This work opens new avenues in the large-scale preparation of low-cost and sustainable pure organic RTP materials.

关键词： room-temperature phosphorescence color-tunable lignin afterglow

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