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Single active-site catalysts constructed with nonpolar-bond linked covalent organic frameworks for oxygen reduction reaction

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Science China Materials 2025年第4期68卷 1138-1144页

作者： Fancheng Meng Xuewen Li Qizheng An Shuai Yang Zixing Zhang Qing Xu Bai Xue Xin Jin Fan Zhang School of Chemistry and Chemical Engineering State Key Laboratory of Meal Matrix CompositesShanghai jiao Tong UniversityShanghai 200240China CAS Key Laboratory of Low-Carbon Conversion Science and Engineering Shanghai Advanced Research Institute(SARI)Chinese Academy of Sciences(CAS)Shanghai 201210China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029China

Covalent organic frameworks(COFs)with polar linkages have been employed as metal-free catalysts for the oxygen reduction reaction(ORR).However,it is still a big challenge to precisely design or locate the catalytic sites for such kinds of COFs because their polar linkages always make some catalytic *** addition,the polar linkages are facile to bind with O_(2) and oxygen-contained intermediates in the catalytic process,severely weakening the long-term stability of these *** this work,we demonstrated the single metalfree catalytic sites based on the pyridine-cored COFs with nonpolar linkages(C=C bonds)to catalyze the *** nonpolar linkages excluded their potential roles as catalytic sites and also circumvented the possible decomposition in the process of *** modulating the pyridine N with positive charges,the catalytic performance can be previously improved,because of the enhanced Lewis acidity of the carbon atoms next to the pyridine N,and thus favorable for the electrons transfer to the catalytic *** newly-synthesized charged COF showed high activity of a half-wave potential of 0.74 V with a mass activity of 4.34 A g^(-1),which was 50 mV more positive and 1.63 times higher than those of the neutral *** the nonpolar linkages made the COFs display better long-term stability than other metal-free *** theoretical calculation revealed that the ionization of pyridine promoted the formation of the intermediate OOH*,and thus improved the catalytic *** work gives us a new insight into designing single sites based on COFs.

关键词： covalent organic frameworks charging-tuned nonpolar linkage Lewis acidity oxygen reduction reaction

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A Novel Multiple Modes Resonant Sensor Featuring Blue Sideband Excitation 38

A Novel Multiple Modes Resonant Sensor Featuring Blue Sideba...

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38th IEEE International Conference on Micro Electro Mechanical Systems, MEMS 2025

作者： Xu, Jiao Zheng, Zhuoyue Xi, Jingqian Zhang, Ziqian Liu, Huafeng Zhang, Pan Chen, Jianlin Wang, Chen Kraft, Michael Wang, Yuan Martins, R.P. Mak, Pui-In Huazhong University of Science and Technology Moe Key Laboratory of Fundamental Physical Quantities Measurement Pgmf School of Physics Wuhan430074 China University of Macau Institute of Microelectronics State Key Laboratory of Analog and Mixed-Signal Vlsi 999078 China Peking University National Key Laboratory of Advanced Micro and Nano Manufacture Technology School of Integrated Circuits 100871 China Shanghai University School of Microelectronics 200444 China Ku Leuven Department of Electrical Engineering-MNS Leuven3000 Belgium

ISBN: (纸本)9798331508890

This paper reports a novel MEMS resonant structure functioning as a baseline resonant electrostatic force/temperature sensor, highlighting its substantial potential in sensing applications. The resonator, characterized by a dual-cosine structure, is capable of simultaneous multiple resonant modes actuation within the 300 kHz range, through a sole-source drive approach using the recent emerging Blue Sideband Excitation (BSE) technique. This method enables a distinctive multi-modal response, essential for multi-parameter measurements. The research focuses on the sensor's temperature characteristics, electrostatic perturbation sensitivity, and noise floor. Notably, the study reveals intriguing temperature responses across different modes, where certain modes exhibit a significant frequency rise with increasing temperature, this is counter-intuitive with common MEMS resonator devices, prompting further investigation into the underlying mechanisms. The analysis of electrostatic perturbation sensitivity and noise background further unfolds the resonator's performance under various excitation conditions, laying a foundation for advancing sensor functionality, and providing solid evidence on the viability of the subject. To sum up, this study highlights the resonator's potential as a high-precision sensor, opening new opportunities for MEMS sensor design and multi-parameter measurement applications. © 2025 IEEE.

关键词： Microchannels

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Angle-resolved magneto-chiral anisotropy in a non-centrosymmetric atomic layer superlattice

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Science Bulletin 2025年第9期70卷 1406-1409页

作者： Cheng, Long Bao, Mingrui Zhang, Xue Zhang, Jingxian Yang, Qun Li, Qiang Cao, Hui Qiu, Dawei Li, Hui Cheng, Guanglei Zhou, Hua Zuo, Jian-Min Zhou, Xiaodong Shen, Jian Zhu, Zhifeng Wang, Wenbo Zhai, Xiaofang School of Physical Science and Technology ShanghaiTech University Shanghai201210 China CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences University of Science and Technology of China Hefei230026 China School of Information Science and Technology ShanghaiTech University Shanghai201210 China State Key Laboratory of Surface Physics and Institute for Nanoelectronic Devices and Quantum Computing Fudan University Shanghai200433 China X-ray Science Division Advanced Photon Source Argonne National Laboratory LemontIL60439 United States Institutes of Physical Science and Information Technology Anhui University Hefei230601 China Department of Materials Science and Engineering and Materials Research Laboratory University of Illinois Urbana–Champaign UrbanaIL61801 United States ShanghaiTech Laboratory for Topological Physics ShanghaiTech University Shanghai201210 China

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Shape-dependency activity of Nanostructured α-Mn2O3 in direct synthesis of ethylene urea from CO2

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Journal of Industrial and engineering Chemistry 2025年

作者： Wang, Fei Jin, Yulong Zhang, Yue Liang, Xuan Liu, Na Wei, Xuejiao Ke, Yihu Xu, Jie Xue, Bing Jiangsu Key Laboratory of Advanced Manufacturing for High-end Chemicals Advanced Catalysis and Green Manufacturing Collaborative Innovation Center School of Petrochemical and Engineering Changzhou University Changzhou213164 China School of Chemical Engineering and Materials Changzhou Institute of Technology Changzhou213164 China School of Chemistry and Chemical Engineering Ningxia Key Laboratory of Solar Chemical Conversion Technology Key Laboratory for Chemical Engineering and Technology State Ethnic Affairs Commission North Minzu University Yinchuan750021 China

The direct conversion of CO2 into high-value chemicals presents a sustainable pathway for greenhouse gas mitigation. While morphology-dependent catalytic activity has been widely explored in oxidation reactions, its role in CO2-based urea synthesis remains uncharted. Herein, we systematically investigate the structure–activity relationship of shape-controlled α-Mn2O3 catalysts (nanosheets/NS, nanocubes/NC, nanooctahedrons/NO) for synthesizing ethylene urea (EU) from CO2 and ethylenediamine (EDA). The Mn2O3-NS catalyst achieves record-breaking efficiency (96 % EDA conversion, 95 % EU selectivity in 20 min at 140 °C), surpassing all reported catalysts. Through combined XRD, XPS, CO2/NH3-TPD, and TEM analyses, we establish that the superior performance of Mn2O3-NS originates from its abundant surface oxygen vacancies (22.5 %) and more strong acid-base sites – features critically linked to its nanosheet morphology. This work not only provides fundamental insights into morphology-governed CO2 activation mechanisms but also advances the rational design of manganese-based catalysts for industrial CO2 valorization. © 2025 The Korean Society of Industrial and engineering Chemistry

关键词： Nanosheets

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Unusual twin induced recrystallization and corresponding texture optimization in a cold rolled Mg-Gd-Zr alloy during annealing

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Journal of Magnesium and Alloys 2025年第3期13卷 1099-1115页

作者： Ning Lv Lingyu Zhao Hong Yan Boyu Liu Rongshi Chen Zhiwei Shan Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang 110016China School of Materials Science and Engineering University of Science and Technology of China72 Wenhua RoadShenyang 110016China School of Materials Science and Engineering Shenyang Ligong UniversityShenyang110159China School of Materials Science and Engineering Shandong University of Science and TechnologyQingdaoShandong 266590China Center for Advancing Materials Performance From the Nanoscale(CAMP-Nano)&Hysitron Applied Research Center in China(HARCC) State Key Laboratory for Mechanical Behavior of MaterialsXi’an Jiaotong UniversityXi’an 710049China

Twins play an important role in the texture transition during *** a cold rolled high rare earth content magnesium(Mg)alloys with{10–12}extension twins,{11–21}extension twins,{10–11}compression twins and{10–11}-{10–12}double twins and frequent twin-twin interactions,quasi-in-situ electron backscatter diffraction method was used to observe the twin induced static recrystallization(SRX)and related effect on texture during *** results show that basal component was consumed owing to the SRX occurred in basal oriented{10–12}twins and SRXed grains with several speciﬁc orientations show preferential grain *** widely operated in the{10–12}extension and{11–21}extension twins,but absent in most{10–11}compression and{10–11}-{10–12}double twins,which is different to traditional twin induced *** compression/double twins detwinned while only partial tension twins *** of{11–21}twins and resultant twin-twin interaction facilitate the formation of serrated twin boundaries,which can serve as nucleation *** ofdislocation and related dislocation interaction in high dislocation density areas promote the formation of new grain boundaries and related ***dislocations in basal oriented twins release the strain accumulation in compression/double twins and thus result in the absence of *** twin size difference,storage energy and dislocation-twin interaction commonly functioned to the detwinning during *** near-coincide site lattice boundaries that show high mobility were considered to be the important contributor to the preferential grain growth of SRXed grains.

关键词： Magnesium alloy {11–21}twin Texture Static recrystallization Detwinning

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Solar-driven H_(2)O_(2)production by S-scheme heterojunction photocatalyst

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Chinese Journal of Catalysis 2025年第5期72卷 24-47页

作者： Han Li Wang Wang Kaiqiang Xu Bei Cheng Jingsan Xu Shaowen Cao School of Automotive Materials Hubei University of Automotive TechnologyShiyan 442020HubeiChina State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina Hubei Technology Innovation Center for Advanced Composites Wuhan University of TechnologyWuhan 430070HubeiChina School of Chemical and Environmental Engineering Shanghai Institute of TechnologyShanghai 201418China School of Chemistry and Physics&Centre for Materials Science Queensland University of TechnologyBrisbaneQueensland 4001Australia

Hydrogen peroxide(H_(2)O_(2)),as an essential and green chemical,is extensively used in energy and environmental ***,the production of H_(2)O_(2)primarily relies on the anthraquinone method,which is an energy-intensive method involving multi-step reactions,producing harmful by-product ***-driven H_(2)O_(2)production,an alternative route for H_(2)O_(2)generation,is a green and sustainable technology since it only utilizes water and oxygen as ***,the rapid recombination of charge carriers as well as insufficient redox capability limit the photocatalytic H_(2)O_(2)production *** step-scheme(S-scheme)heterojunction photocatalysts has been regarded as an effective strategy to address these drawbacks because it not only achieves spatially separated charge carriers,but also preserves redox capability of the photocatalytic *** paper covers the recent advances of S-scheme heterojunction photocatalysts for H_(2)O_(2)production in terms of basic principles,characterization techniques,and preparation ***,the mechanism and advantages of S-scheme heterojunction for photocatalytic H_(2)O_(2)generation are systematically *** recent S-scheme heterojunction designs,including inorganic-organic heterojunction,inorganic-inorganic heterojunction,and organic-organic heterojunction,are ***,the challenges and research directions of S-scheme photocatalysts for H_(2)O_(2)generation are presented.

关键词： Step-scheme heterojunction H_(2)O_(2)photosynthesis Charge migration mechanism Solar conversion

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Metal-incorporated interphases formed between inorganic solid electrolytes and Li metal: beneficial or detrimental?

EES Batteries

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EES Batteries 2025年第2期1卷 242-249页

作者： Han Su Jiamin Fu Sufu Liu Yu Zhong Yang Hu Juner Kuang Minkang Wang Xiuli Wang Xueliang Sun Jiangping Tu State Key Laboratory of Silicon and Advanced Semiconductor Materials Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province School of Materials Science and Engineering Zhejiang University Hangzhou 310027 China Department of Mechanical and Materials Engineering University of Western Ontario London Ontario Canada Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Nankai University Tianjin 300071 China Eastern Institute for Advanced Study Eastern Institute of Technology Ningbo Zhejiang 315020 China

Most inorganic solid electrolytes (ISEs) undergo reduction when in contact with Li metal to form a new interphase. Traditionally, it was suggested that such interphases should ideally be metal-free, since metals with high electronic conductivity may contribute to the generation of mixed conducting interphases, thereby leading to continuous reduction of the ISE and significant consumption of Li metal. However, recent studies challenge this viewpoint, showing that certain metal-incorporated interphases (MIIs) can suppress Li intrusion and improve lithium reversibility compared to metal-free interphases. In this perspective, we aim to address the ongoing debate surrounding the role of metal incorporation at the interphase formed between ISEs and Li metal. We first propose a protocol for critically assessing the MII based on Li asymmetric cells. Throughout the comparative analysis, we discover that the use of conventional Li symmetric cells yields misleading results when evaluating MIIs. In contrast, our proposed Li asymmetric cells can more accurately reflect the impact of MIIs on Li reversibility. Furthermore, we observe that when the metal volume fraction in the MII is sufficiently low, the MII significantly enhances lithium reversibility compared to its metal-free counterparts. We explain this phenomenon through percolation theory. Lastly, we provide insights into future design strategies for MIIs, aiming to offer guidance for the progress of Li/ISE interface design.

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Study on Gas Production Characteristics of Thermally Aged Composite Insulator Core Rods Under Vacuum Conditions 1st

Study on Gas Production Characteristics of Thermally Aged Co...

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1st Electrical Artificial Intelligence Conference, EAIC 2024

作者： Xiaogang, Li Dandan, Zhang Ji, Wang Kexin, Shi Zhao, Chen Xiang, Cai Gaoli, Song Zhiyu, Wan Henan Jiuyu EPRI Electric Power Technology Co. Ltd. Zhengzhou450052 China School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China Ministry of Education Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology Wuhan430074 China Disaster Prevention and Reduction Center State Grid Hunan Electric Power Company Limited Changsha410000 China

ISBN: (纸本)9789819640669

Given the extensive utilization of composite insulators in electricity systems, the unresolved decay-like fragmentation of the composite insulator is of paramount importance in the preservation of the system’s functionality in daily life. The core rod’s gas production during the thermal aging process has been verified, which may result in the silicone rubber sheath deforming and potentially rupturing. This study has created an innovative vacuum thermal aging experiment platform that enables the conduct of thermal aging tests under vacuum conditions, thereby further elucidating the process of gas generation and its consequential impact. In addition, this platform is capable of accurately monitoring and recording the gas pressure value in the heating chamber in real time, as well as gathering the gases generated by the thermal degradation of composite insulator core rods. The experimental results elucidate the characteristics of gas production, with a particular emphasis on the thermal press. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Gas fuel manufacture

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Wideband Channel Measurement and Characterization Based on 5G Passive Sounding in Railway Scenarios

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China Communications 2025年第4期22卷 13-26页

作者： Zheng Peng Fei Dan Chen Chen Chen Haoran Huang Yanyan Ai Bo School of Electronic and Information Engineering Beijing Jiaotong UniversityBeijing 100044China State Key Laboratory of Advanced Rail Autonomous Operation Beijing Jiaotong UniversityBeijing 100044China Nanjing Rongcai Transportation Technology Research Institute Co. LtdNanjing 211121China Frontiers Science Center for Smart High-Speed Railway System Beijing Jiaotong UniversityBeijing 100044China

With the development of wireless communication,the fifth generation mobile communication technology(5G)has emerged as a hot topic in highspeed railway communication system and has moved towards industrial *** the radio propagation characteristics in 5G high-speed train(HST)scenarios is essential for enhancing wireless coverage and overall system *** propose a novel 5G passive sounding scheme to extract channel impulse responses(CIRs)using channel state information reference signals(CSI-RS)from the target 5G base station(BS).Detailed procedures for timefrequency synchronization,CSI-RS detection and extraction are presented through *** the laboratory work involving absolute power calibration,phase coherence calibration and power delay profile(PDP)validation,we validate the accuracy and performance of the developed ***,a measurement campaign was conducted in HST scenarios encompassing both residential and undeveloped *** path loss(PL)model and the channel characteristics including stationarity interval(SI),multipath components(MPCs),shadow fading(SF),Rician K-factor,root mean square(RMS)delay spread and received correlation coefficients are analyzed and *** estimated channel characteristics and the statistical model presented in this paper will contribute to the research on HST radio propagation and the development of 5G railway communication systems.

关键词： 5G channel characterization channel measurement high-speed train passive sounding

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An Investigation into the Products of Thermally Aged Composite Insulator Core Rods 1st

An Investigation into the Products of Thermally Aged Composi...

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1st Electrical Artificial Intelligence Conference, EAIC 2024

ISBN: (纸本)9789819640669

Chinese regions exhibit a highly uneven distribution of substantial energy re-serves and significant electrical energy loads. The actual situation necessitates the electricity system to depend increasingly significantly on transmission lines, in which composite insulators play a vital role. Historically, conventional fractures have been well treated, but the more recent type of fracture known as decay-like fracture is currently being investigated. In the event of a fracture, mishaps such as transmission line dropping may arise, leading to the termination of power supply and failure to restore it promptly. In order to effectively prevent the occurrence of decay-like fractures, researchers are currently endeavoring to understand the mechanism of this fracture, including its specific initiation point and the process of degradation. Drawing from prior research, heat has been identified as a reliable indicator of fracture occurrence. The objective of this work is to determine the impact of thermal stress by examining products during the process of thermal aging. Experimental trials are conducted at various temperatures for a duration of 5 h. Following testing, samples and products obtained from studies are subjected to additional observation and analysis using Fourier Transform Infrared spectroscopy (FTIR) and Gas Chromatography Mass Spectrometry (GC-MS). This work quantifies the chemical composition of the related gaseous products and compares the FTIR results of samples before and after trials to determine the changes in functional groups. Analytical findings can serve as the foundation for further investigation of the decay-like fracture mechanism, namely the process of fracture intensification. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Gas chromatography

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