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Enhancing potassium-ion storage of Bi_(2)S_(3) through external–internal dual synergism: Ti_(3)C_(2)T_(x) compositing and Cu^(2+) doping

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Carbon Energy 2024年第9期6卷 39-51页

作者： Dawei Sha Yurong You rongxiang hu Jianxiang Ding Xin Cao Yuan Zhang Long Pan ZhengMing Sun Key Laboratory of Advanced Metallic Materials of Jiangsu Province School of Materials Science and EngineeringSoutheast UniversityNanjingJiangsuChina Institute of Technology for Carbon Neutralization College of ElectricalEnergy and Power EngineeringYangzhou UniversityYangzhouJiangsuChina School of Materials Science and Engineering Anhui University of TechnologyMa'anshanAnhuiChina

Potassium-ion batteries(PIBs)offer a cost-effective and resource-abundant solution for large-scale energy ***,the progress of PIBs is impeded by the lack of high-capacity,long-life,and fast-kinetics anode electrode ***,we propose a dual synergic optimization strategy to enhance the K^(+)storage stability and reaction kinetics of Bi_(2)S_(3) through two-dimensional compositing and cation ***,Bi_(2)S_(3) nanoparticles are loaded onto the surface of three-dimensional interconnected Ti_(3)C_(2)T_(x) nanosheets to stabilize the electrode ***,Cu^(2+)doping acts as active sites to accelerate K^(+)storage *** theoretical simulations and ex situ techniques are used to elucidate the external–internal dual *** discharge,Ti_(3)C_(2)T_(x) and Cu^(2+)collaboratively facilitate K+***,Cu^(2+)doping primarily promotes the fracture of Bi2S3 bonds,facilitating a conversion *** cycling,the Ti_(3)C_(2)T_(x) composite structure and Cu^(2+)doping sustain *** resulting Cu^(2+)-doped Bi2S3 anchored on Ti_(3)C_(2)T_(x)(C-BT)shows excellent rate capability(600 mAh g^(-1) at 0.1 A g^(–1);105 mAh g^(-1) at 5.0 A g^(-1))and cycling performance(91 mAh g^(-1) at 5.0 A g^(-1) after 1000 cycles)in half cells and a high energy density(179 Wh kg–1)in full cells.

关键词： Bi_(2)S_(3) cation doping potassium-ion batteries synergic mechanism Ti_(3)C_(2)T_(x)compositing

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具有三明治结构的MXene/聚酰亚胺复合泡沫用于多尺度微波吸收

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Science China Materials 2024年第1期67卷 272-278页

作者：张亚君韩美康胡荣祥张培根潘龙孙正明 Key Laboratory of Advanced Metallic Materials of Jiangsu Province School of Materials Science and EngineeringSoutheast UniversityNanjing 211189China Institute of Optoelectronics and Shanghai Frontiers Science Research Base of Intelligent Optoelectronics and Perception Fudan UniversityShanghai 200433China

三维多孔结构可促进电磁波在材料内部的多重反射,是提升微波吸收性能的有效方法.然而,传统的三维多孔结构中,多重反射仅发生在孔内.扩大多重反射的范围应能进一步提升材料的吸收性能.因此,本文开发了一种孔壁为三明治结构的三维多孔复... 详细信息

三维多孔结构可促进电磁波在材料内部的多重反射,是提升微波吸收性能的有效方法.然而,传统的三维多孔结构中,多重反射仅发生在孔内.扩大多重反射的范围应能进一步提升材料的吸收性能.因此,本文开发了一种孔壁为三明治结构的三维多孔复合泡沫,在亚毫米尺度孔和亚微米尺度孔壁中同时发生多重反射,实现多尺度微波吸收.本研究采用聚多巴胺修饰的聚酰亚胺泡沫(PDA@PIF)作为三维多孔骨架,在其孔壁表面负载Ti_(3)C_(2)T_(x).所得的Ti_(3)C_(2)T_(x)@PDA@PIF能够在整个X波段吸收超过90%的入射波.这得益于多尺度多重反射、电导损耗和界面极化.同时,该复合泡沫具有优异的柔性和低密度(~30 mg cm^(-3)).该工作为实现轻质、柔性、宽频的吸波材料提供了一种可行的方法,丰富了电磁防护的有效结构.

关键词：三明治结构聚酰亚胺泡沫多重反射微米尺度微波吸收复合泡沫电磁防护吸收性能

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Flame-retardant concentrated electrolyte enabling a Li F-rich solid electrolyte interface to improve cycle performance of wide-temperature lithium–sulfur batteries

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Journal of Energy Chemistry 2020年第12期29卷 154-160页

作者： Zhe Yu Jianjun Zhang Chao Wang rongxiang hu Xiaofan Du Ben Tang Hongtao Qu Han Wu Xin Liu Xinhong Zhou Xiaoyan Yang Guanglei Cui College of Chemistry and Molecular Engineering Qingdao University of Science and TechnologyQingdao 266042ShandongChina Qingdao Industrial Energy Storage Technology Institute Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdao 266101ShandongChina

Lithium–sulfur batteries have been regarded as the most promising high-energy electrochemical energy storage device owing to the high energy density, low cost and environmental friendliness. However, traditional lithium–sulfur batteries using ether-based electrolytes often suffer from severe safety risks(i.e. combustion). Herein, we demonstrated a novel kind of flame-retardant concentrated electrolyte(6.5 M lithium bis(trifluoromethylsulphonyl)imide/fluoroethylene carbonate) for highly-safe and widetemperature lithium–sulfur batteries. It was found that such concentrated electrolyte showed superior flame retardancy, high lithium-ion transference number(0.69) and steady lithium plating/stripping behavior(2.5 m Ah cm^(-2) over 3000 h). Moreover, lithium–sulfur batteries using this flame-retardant concentrated electrolyte delivered outstanding cycle performance in a wide range of temperatures(-10 °C, 25 °C and 90 °C). This superior battery performance is mainly attributed to the LiF-rich solid electrolyte interphase formed on lithium metal anode, which can effectively suppress the continuous growth of lithium dendrites. Above-mentioned fascinating characteristics would endow this flame-retardant concentrated electrolyte a very promising candidate for highly-safe and wide-temperature lithium–sulfur batteries.

关键词： Flame retardancy Concentrated electrolyte LiF-rich solid electrolyte interphase Lithium–sulfur batteries Wide temperature

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Suspended nanomembrane silicon photonic integrated circuits

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Chip 2024年第3期3卷 29-35页

作者： rongxiang Guo Qiyue Lang Zunyue Zhang Haofeng hu Tiegen Liu Jiaqi Wang Zhenzhou Cheng School of Precision Instrument and Opto-electronics Engineering Tianjin UniversityTianjin 300072China Key Laboratory of Opto-electronic Information Technology Ministry of EducationTianjin 300072China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China Georgia Tech-Shenzhen Institute Tianjin UniversityShenzhen 518055China Department of Chemistry The University of TokyoTokyo 113-0033Japan School of Physics and Electronic Engineering Xinjiang Normal UniversityUrumqi 830054China

Leveraging the low linear and nonlinear absorption loss of silicon at mid-infrared(mid-IR)wavelengths,silicon photonic integrated circuits(PICs)have attracted significant attention for mid-IR applications including optical sensing,spectroscopy,and nonlinear ***,mid-IR silicon PICs typically show moderate performance compared to state-of-the-art silicon photonic devices operating in the telecommunication ***,we proposed and demonstrated suspended nanomembrane silicon(SNS)PICs with light-guiding within deep-subwavelength waveguide thickness for operation in the short-wavelength mid-IR *** demonstrated key building components,namely,grating couplers,waveguide arrays,micro-resonators,etc.,which exhibit excellent performances in bandwidths,back reflections,quality factors,and fabrication ***,the results show that the proposed SNS PICs have high compatibility with the multi-project wafer foundry *** study provides an unprecedented platform for mid-IR integrated photonics and applications.

关键词： Silicon photonics Suspended waveguide Mid-infrared Photonic integrated circuits Subwavelength grating

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Built‑In Electric Field‑Driven Ultrahigh‑Rate K‑Ion Storage via Heterostructure Engineering of Dual Tellurides Integrated with Ti_(3)C_(2)T_(x)MXene

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纳微快报:英文版 2023年第12期15卷 127-140页

作者： Long Pan rongxiang hu Yuan Zhang Dawei Sha Xin Cao Zhuoran Li Yonggui Zhao Jiangxiang Ding Yaping Wang ZhengMing Sun Key Laboratory of Advanced Metallic Materials of Jiangsu Province School of Materials Science and EngineeringSoutheast UniversityNanjing 211189People’s Republic of China Department of Chemistry University of ZurichWinterthurerstrasse 190CH‑8057 ZurichSwitzerland School of Materials Science and Engineering Anhui University of TechnologyMa’anshan 243002AnhuiPeople’s Republic of China

Exploiting high-rate anode materials with fast K+diffusion is intriguing for the development of advanced potassium-ion batteries(KIBs)but remains ***,heterostructure engineering is proposed to construct the dual transition metal tellurides(CoTe_(2)/ZnTe),which are anchored onto two-dimensional(2D)Ti_(3)C_(2)T_(x)MXene *** theoretical modeling and experimental findings reveal that heterostructure engineering can regulate the electronic structures of CoTe_(2)/ZnTe interfaces,improving K+diffusion and *** addition,the different work functions between CoTe_(2)/ZnTe induce a robust built-in electric field at the CoTe_(2)/ZnTe interface,providing a strong driving force to facilitate charge ***,the conductive and elastic Ti_(3)C_(2)T_(x)can effectively promote electrode conductivity and alleviate the volume change of CoTe_(2)/ZnTe heterostructures upon *** to these merits,the resulting CoTe_(2)/ZnTe/Ti_(3)C_(2)T_(x)(CZT)exhibit excellent rate capability(137.0 mAh g^(-1)at 10 A g^(-1))and cycling stability(175.3 mAh g^(-1)after 4000 cycles at 3.0 A g^(-1),with a high capacity retention of 89.4%).More impressively,the CZT-based full cells demonstrate high energy density(220.2 Wh kg^(-1))and power density(837.2 W kg^(-1)).This work provides a general and effective strategy by integrating heterostructure engineering and 2D material nanocompositing for designing advanced high-rate anode materials for next-generation KIBs.

关键词： Transition metal tellurides Heterostructures Built-in electric field Potassium-ion batteries Anode material

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Predicting the strut forces of the steel supporting structure of deep excavation considering various factors by machine learning methods

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Underground Space 2024年第5期18卷 114-129页

作者： Haibo hu Xunjian hu Xiaonan Gong Research Center of Coastal and Urban Geotechnical Engineering Zhejiang UniversityHangzhou 310058China

The application of steel strut force servo systems in deep excavation engineering is not widespread,and there is a notable scarcity of in-situ measured *** presents a significant research gap in the *** this,our study introduces a valuable dataset and application scenarios,serving as a reference point for future *** main objective of this study is to use machine learning(ML)methods for accurately predicting strut forces in steel supporting structures,a crucial aspect for the safety and stability of deep excavation *** employed five different ML methods:radial basis function neural network(RBFNN),back propagation neural network(BPNN),K-Nearest Neighbor(KNN),support vector machine(SVM),and random forest(RF),utilizing a dataset of 2208 measured *** points included one output parameter(strut forces)and seven input parameters(vertical position of strut,plane position of strut,time,temperature,unit weight,cohesion,and internal frictional angle).The effectiveness of these methods was assessed using root mean square error(RMSE),correlation coefficient(R),and mean absolute error(MAE).Our findings indicate that the BPNN method outperforms others,with RMSE,R,and MAE values of 72.1 kN,0.9931,and 57.4 kN,respectively,on the testing *** study underscores the potential of ML methods in precisely predicting strut forces in deep excavation engineering,contributing to enhanced safety measures and project planning.

关键词： Deep excavation Steel supporting structure Strut forces Machine learning Time Temperature

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The super-cycle of the global land-monsoon system

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National Science Review 2024年第05期11卷 107-109页

作者： Yongyun hu Laboratory for Climate and Ocean-Atmosphere Studies Department of Atmospheric and Oceanic Sciences School of Physics Peking University

The modern monsoon system consists of six regional monsoons [1]. These regional monsoons demonstrate coherently annual variations of precipitation and atmospheric circulation patterns, although they have different characteristics. Therefore, these regional monsoons are unified in the context of the global monsoon [1,2], which reflects the dominant mode of coherent annual variations of precipitation and atmospheric circulations in the tropics and subtropics.

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外加磁场对等离子熔覆Fe313合金涂层组织性能的影响

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材料导报 2020年第24期34卷 24127-24131页

作者：时运胡荣祥马骏杜培松陈曦杜晓东合肥工业大学材料科学与工程学院合肥230009

利用外加磁场辅助等离子熔覆技术在45钢表面制备了Fe313合金涂层。利用OM、SEM、EDS和XRD等表征手段对涂层进行了显微组织和物相组成分析。采用维氏硬度计测试了涂层的显微硬度,通过摩擦磨损实验研究了涂层的磨损性能。结果表明:外加磁... 详细信息

利用外加磁场辅助等离子熔覆技术在45钢表面制备了Fe313合金涂层。利用OM、SEM、EDS和XRD等表征手段对涂层进行了显微组织和物相组成分析。采用维氏硬度计测试了涂层的显微硬度,通过摩擦磨损实验研究了涂层的磨损性能。结果表明:外加磁场后,在电磁搅拌的作用下,涂层中粗大的柱状晶转变为细小的等轴晶,晶粒细化效果明显。涂层显微组织为亚共晶组织,包含初生过饱和(Fe,Cr)固溶体相以及枝间共晶碳化物相(M 7C 3型碳化物),外加磁场使得共晶碳化物更为细小均匀地分布在涂层中。此外,外加磁场后制得的涂层的显微硬度明显大于未外加磁场时制得的涂层的显微硬度,耐磨性也得到明显改善。在载荷为50 N时,外加磁场电流为0 A和5 A制得的涂层的磨损机制为粘着磨损,外加电流为7 A和9 A制得的涂层的磨损机制为磨粒磨损和轻微粘着磨损混合磨损机制;当载荷为100 N和150 N时,外加磁场电流为0 A和5 A制得的涂层粘着磨损加剧,外加电流为7 A和9 A制得的涂层磨损机制由混合磨损机制转变为粘着磨损机制。

关键词：等离子熔覆技术磁场辅助组织细化表面改性摩擦磨损

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R-matrix for the 8-Dimensional Spin Representation of Uq(so7)

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Acta Mathematica Sinica,English Series 2024年第2期40卷 485-497页

作者： Hong Mei hu Nai Hong hu School of Mathematical Sciences Suzhou University of Science and TechnologySuzhou 215009P.R.China School of Mathematical Sciences MOE Key Laboratory of Mathematics and Engineering Applications&Shanghai Key Laboratory of PMMPEast China Normal UniversityShanghai 200241P.R.China

The purpose of the paper is to describe the solution to the quantum Yang-Baxter equation associated with the 8-dimensional spin representation Tsp of Uq(so7).The self-duality of Tsp and the symmetry of the corresponding braiding matrix are ***,the minimal polynomial of the braiding R-matrix of Tsp is presented explicitly in an ingenious method by taking advantage of nice features of the spin representation Tsp.

关键词： Braiding R-matrix spin module minimal polynomial

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Investigation of mechanical and electrical characteristics of selfsensing pneumatic torsional actuators

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Science China(Technological Sciences) 2024年第1期67卷 130-142页

作者： XIAO Wei hu DeAn hu GuoLiang XIAO Yihua Key Laboratory of Conveyance and Equipment Ministry of EducationEast China Jiaotong UniversityNanchang 330013China Key Laboratory of Advanced Design and Simulation Techniques for Special Equipment Ministry of EducationHunan UniversityChangsha 410082China

Soft pneumatic actuators are one of the most promising actuation for soft robots,and great achievements have been *** it remains challenging to endow sensing capabilities to pneumatic actuators,especially for the sensing ability originating directly from the actuator ***,a self-sensing pneumatic torsional actuator(SPTA)is designed based on the electromagnetic induction effect and magnetically responsive *** SPTA can generate feedback voltage and current with the deformation,in which the sensing function comes from its inherent *** investigate the mechanical and electrical characteristics,an experimental platform and a finite element model are established,*** find that the torsion angle and output torque increase in nonlinear with the actuating *** maximum torsion angle is 66.35°,which is 84.34%of that for the actuator fabricated by pure *** maximum output torque(24.9 N mm)improves by 23.19%compared with the actuator made by pure *** regards the electrical characteristics,the maximum feedback voltage and current are 2.90μV and 29.50 nA when the SPTA is actuated by a pressure of−40 *** also demonstrate that the relationship between the torsion angle and the magnetic flux change is approximately ***,the number of turns of wires,magnetic powders contents,and magnetic direction on the feedback voltage and current are *** show that the feedback voltage and current can be enhanced by increasing the number of turns and magnetic powders *** envision that the SPTA would be promising for soft robots to realize their accuracy control and intelligentization.

关键词： pneumatic torsional actuators self-sensing feedback voltage finite element modeling soft robots

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