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Alloy/layer double hydroxide interphasic synergy via nano-heterointerfacing for highly reversible co.(2)redox reaction in Li-co.(2)batteries

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Nano Research 2024年第6期17卷 5206-5215页

作者： Tianzhen Jian Wenqing Ma Jiagang Hou Jianping Ma Xianhong Li Haiyang Gao Caixia Xu Hong Liu Institute for Advanced Interdisciplinary Research(iAIR) Collaborative Innovation Center of Technology and Equipment for Biological Diagnosis and Therapy in Universities of ShandongSchool of Chemistry and Chemical EngineeringUniversity of JinanJinan 250022China Kyiv co.lege at Qilu University of Technology Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100China shandong sacred sun power sources co. Ltd.Qufu 273100China

Li-co.(2)batteries are among the most intriguing techniques for balancing the carbon cycle,but are challenged by the annoyed thermodynamic barrier of the Li_(2)co.(3)deco.position reaction.Herein,we demonstrate the electrocatalytic performances of two-dimensional(2D)co.l-layer double hydroxide(LDH)nanosheets can be significantly improved by trans-dimensional crosslinking with three-dimensional(3D)multilevel nanoporous(MP)-Ruco.l alloy(MP-Ruco.l alloy⊥co.l-LDH).The MP-Ruco.l alloy⊥co.l-LDH with multiscale pore channels and abundant nano-heterointerface is directly prepared by co.trollable etching Al from a Ru-co.Al master alloy along with simultaneous partial oxidization of Al and co.atoms.The MP-Ruco.l is co.posed of various intermetallic co.pounds and Ru with abundant grain boundaries,and forms numerous heterointerface with 2D co.l-LDH nanosheets.The multiscale porous metallic network benefits mass and electron transportation as well as discharge product storage and enables a rich multiphase reaction interface.In situ differential electrochemical mass spectrometry shows that the mass-to-charge ratio in the charging process is~0.733 which is co.sistent with the theoretical value of 3/4,stating that the reversible co.deco.position of Li_(2)co.(3)and C can be achieved with the MP-Ruco.l alloy⊥co.l-LDH.The Ketjen black(KB)/MP-Ruco.l⊥co.l-LDH battery demonstrates a high cyclability for over 2270 h(227 cycles)with a lower voltage gap stabilized at~1.3 V at 200 mA·g^(−1).Our findings here provide useful guidelines for developing high efficiency transition metal based electrocatalysts by co.pling with co.ductive porous substrate for impelling the development of practical Li-co.(2)battery systems.

关键词： heterojunction interface nanoporous Li-co.(2)battery dealloying

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Research on ECMS Based on Segmented Path Braking Energy Reco.ery in a Fuel Cell Vehicle

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Energy Engineering 2024年第1期121卷 95-110页

作者： Wen sun Meijing Li Guoxiang Li Ke sun Shuzhan Bai School of Energy and power Engineering Shandong UniversityJinan250061China Automotive Research Institute China National Heavy Duty Truck Group Co.Ltd.Jinan250061China

Proton exchange membrane fuel cells are widely regarded as having the potential to replace internal co.bustion engines in vehicles.Since fuel cells cannot reco.er energy and have a slow dynamic response,they need to be used with different power sources.Developing efficient energy management strategies to achieve excellent fuel eco.omy is the goal of research.This paper proposes an adaptive equivalent fuel minimum co.sumption strategy(AECMS)to solve the problem of the poor eco.omy of the whole vehicle caused by the wrong selection of equivalent factors(EF)in traditional ECMS.In this method,the kinematics interval is used to update the equivalent factor by co.sidering the penalty term of energy reco.ery on SOC changes.Finally,the optimized equivalent factor is substituted into the optimization objective function to achieve efficient energy regulation.Simulation results under the New European Driving Cycle show that co.pared with the traditional ECMS based on fixed SOC benchmarks,the proposed method improves fuel eco.omy by 1.7%while ensuring vehicle power and increases SOC by 30%.

关键词： Fuel cell PEMFC electric vehicle equivalent co.sumption minimization strategy

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Synthesis,Al^(3+)/Mg^(2+) Intercalation and Structure Study of Graphite-like Carbon Nitride

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Journal of Materials Science & Technology 2011年第3期27卷 245-251页

作者： Xifeng Lu Hongjun Wang Yi Yang Tao Liu Lunan Institute of co.l Chemical Engineering Jining 272000 China National Center for Quality Supervision and hlspection of co.l and co.l Chemical Product Jining 272000 China Shangdong sacred sun power sources co. Ltd. Qufu 237100 China

Graphite-like carbon nitride （g-C3N4） was synthesized in large quantities at 300 ℃ under nitrogen by a solidstate reaction route. Furthermore, Al3＋ and Mg2＋ intercalation of g-CaN4 was performed by an electrochemical method. The starting C3N4 materials and intercalation co.pounds were characterized by X-ray powder diffraction, Fourier transform infrared spectra, thermogravimetry, transmission electron microsco.y, and X-ray photoelectron spectrosco.y. The possible structure model of intercalation co.pounds was proposed. The cation-π interactions and electrostatic interactions were used to explain the changes of microstructure and chemical bonds before and after intercalation.

关键词： Carbon nitride materials Solid state reactions Intercalation Microstructure

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Blue LED-pumped intense short-wave infrared luminescence based on Cr^(3+)-Yb^(3+)-co.doped phosphors

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Light(Science & Applications) 2022年第6期11卷 1194-1205页

作者： Yan Zhang Shihai Miao Yanjie Liang Chao Liang Dongxun Chen Xihui Shan Kangning sun Xiao-Jun Wang Key Laboratory for Liquid-Solid Structure Evolution and Processing of Materials Ministry of EducationShandong UniversityJinan 250061China Jiangsu Bree Optronics co. LtdNanjing 211103China Department of Physics Georgia Southern UniversityStatesboroGA 30460USA

The growing demand for spectrosco.y applications in the areas of agriculture,retail and healthcare has led to extensive research on infrared light sources.The ability of phosphors to absorb blue light from co.mercial LED and co.vert the excitation energy into long-wavelength infrared luminescence is crucial for the design of co.t-effective and high-performance phosphor-co.verted infrared LEDs.However,the lack of ideal blue-pumped short-wave infrared(SWIR)phosphors with an emission peak longer than 900 nm greatly limits the development of SWIR LEDs using light co.verter technology.Here we have developed a series of SWIR-emitting materials with high luminescence efficiency and excellent thermal stability by co.doping Cr^(3+)-Yb^(3+) ion pairs into Lu_(0.2)Sc_(0.8)BO_(3) host materials.Benefitting from strong light absorption of Cr^(3+) in the blue waveband and very efficient Cr^(3+)→Yb^(3+) energy transfer,the as-synthesized Lu_(0.2)Sc_(0.8)BO_(3):Cr^(3+),Yb^(3+) phosphor emits intense SWIR light in the 900-1200 nm from Yb^(3+) under excitation with blue light at~460 nm.The optimized phosphor presents an internal quantum yield of 73.6%and the SWIR luminescence intensity at 100℃can still keep 88.4%of the starting value at 25℃.SWIR LED prototype device based on Lu0.2Sc0.8BO3∶Cr^(3+)Yb^(3+) phosphor exhibits exceptional luminescence performance,delivering SWIR radiant power of 18.4 mW with 9.3%of blue-to-SWIR power co.version efficiency and 5.0%of electricity-to-SWIR light energy co.version efficiency at 120 mA driving current.Moreover,under the illumination of high-power SWIR LED,co.ert information identification and night vision lighting have been realized,demonstrating a very bright prospect for practical applications.

关键词： luminescence intense wave

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Analysis of Non-Sinusoidal Steady Electric Field of ±500 kV co.verter Transformer

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Energy and power Engineering 2017年第4期9卷 53-62页

作者： Gang Liu Cheng Chi Yanjiao Jin Yongqiang Ma Lipeng sun Lin Li Youliang sun Hebei Provincial Key Laboratory of power Transmission Equipment Security Defense North China Electric Power Universi-ty Baoding China State Key Laboratory of Alternate Electrical power System with Renewable Energy sources North China Electric Power University Beijing China shandong power Equipment co. Ltd. Jinan China

The line side winding is under the fundamental frequency AC voltage, while the valve side winding co.tains not only fundamental AC voltage co.ponent, but also the DC voltage co.ponent, fundamental AC voltage co.ponent, and higher harmonic voltage co.ponents when the co.verter transformer is at its normal operating co.dition, and the electric field of co.verter transformer is a non-sinusoidal steady one. To analyze the non-sinusoidal steady electric field co.taining the DC co.ponent, fundamental AC and higher harmonic co.ponents, the voltage spectrum of the valve winding in a ±500 kV co.verter transformer is firstly analyzed, and the non-sinusoidal periodic steady electric field is obtained by the fast discrete Fourier transform. Different resistivity of the oil and oil-immersed paper is adopted to simulate the aging of oil paper insulation at operation, and get the non-sinusoidal steady electric field.

关键词： co.verter Transformer AC-DC Hybrid Non-Sinusoidal Periodic Electric Field

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