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Recent Developments of Transition Metal Compounds-Carbon Hybrid Electrodes for High Energy/Power Supercapacitors

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Nano-Micro Letters 2021年第8期13卷 231-262页

作者： kang ren Zheng Liu Tong Wei Zhuangjun Fan State Key Laboratory of Heavy Oil Processing School of Materials Science and EngineeringChina University of Petroleum(East China)Qingdao 266580People’s Republic of China

Due to their rapid power delivery,fast charging,and long cycle life,supercapacitors have become an important energy storage technology ***,to meet the continuously increasing demands in the fields of portable electronics,transportation,and future robotic technologies,supercapacitors with higher energy densities without sacrificing high power densities and cycle stabilities are still *** metal compounds(TMCs)possessing high theoretical capacitance are always used as electrode materials to improve the energy densities of ***,the power densities and cycle lives of such TMCs-based electrodes are still inferior due to their low intrinsic conductivity and large volume expansion during the charge/discharge process,which greatly impede their large-scale *** recently,the ideal integrating of TMCs and conductive carbon skeletons is considered as an effective solution to solve the above ***,we summarize the recent developments of TMCs/carbon hybrid electrodes which exhibit both high energy/power densities from the aspects of structural design strategies,including conductive carbon skeleton,interface engineering,and electronic ***,the remaining challenges and future perspectives are also highlighted so as to provide strategies for the high energy/power TMCs/carbon-based supercapacitors.

关键词： TMCs/carbon hybrid Supercapacitors High power density Carbon skeleton Interfacial engineering Transition metal electronic structure

Effects of electromagnetic vibration on the structure and mechanical properties of Al-6%Si alloy during directional solidification

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Acta Metallurgica Sinica(English Letters) 2009年第1期22卷 35-39页

作者： Jianbo YU Zhongming ren Weili ren kang DENG Yunbo ZHONG Department of Materials Science and Engineering Shanghai University Shanghai 200072 China

The effects of electromagnetic vibration on the grain refinement in directional solid- ification were investigated. It was found that the electromagnetic vibration applied in the melt not only can refine grains remarkably but also can enhance both tensile strength and ductility values of Al-6%Si alloy. SEM graphs show that coarse dendrite structure was broken up into a somewhat globular structure, and the morphology of eutectic silicon was changed from flaky to fibrous under electromagnetic vibration treatment. The refine mechanism under electromagnetic vibration was discussed.

关键词： Electromagnetic vibration Grain refinement Directional solidification Mechanical property

Primary and secondary control in DC microgrids: a review

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Journal of Modern Power Systems and Clean Energy 2019年第2期7卷 227-242页

作者： Fei GAO ren kang Jun CAO Tao YANG Department of Engineering Science University of OxfordOxfordUK Mixergy OxfordUK School of Geography Geology and the EnvironmentKeele UniversityKeeleUK Department of Electric and Electronic Engineering The University of NottinghamNottinghamUK

With the rapid development of power electronics technology, microgrid(MG) concept has been widely accepted in the field of electrical engineering. Due to the advantages of direct current(DC)distribution systems such as reduced losses and easy integration with energy storage resources, DC MGs have drawn increasing attentions nowadays. With the increase of distributed generation, a DC MG consisting of multiple sources is a hot research topic. The challenge in such a multi-source DC MG is to provide voltage support and good power sharing performance. As the control strategy plays an important role in ensuring MG’s power quality and efficiency, a comprehensive review of the state-of-art control approaches in DC MGs is necessary. This paper provides an overview of the primary and secondary control methods under the hierarchical control architecture for DC MGs. Specifically,inner loop and droop control approaches in primary control are reviewed. Centralized, distributed and decentralized approach based secondary control is discussed in *** findings and future trends are also presented at last.

关键词： Primary control Secondary control DC microgrids Droop control Power sharing

A long term calibration and verification of a submerged aquatic vegetation model for Lake Okeechobee

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Ecological Processes 2013年第1期2卷 232-244页

作者： kang-ren Jin Zhen-Gang Ji South Florida Water Management District P.O.Box 24680West Palm BeachFL 334164680USA Department of Civil Engineering Catholic University of AmericaPangborn HallRoom G12WashingtonDC 20064USA

Introduction:Submerged aquatic vegetation(SAV)has multiple functions in Lake *** provides critical habitat for fish and wildlife,stabilizes sediments,reduces phosphorus(P)concentration in the water column by preventing re-suspension of P-rich sediments,and provides a substrate for attached algae,which also helps to remove P from the water *** year water quality and SAV growth simulations are presented and compared with observed SAV and water quality data collected in the nearshore zone in Lake ***:The SAV theory and approach used in the LOEM are modified from the Chesapeake Bay model and incorporate three state variables:shoots(above the bed sediment),roots(in the bed sediment),and epiphytes(attached to the shoots).The SAV model has direct linkages with the water quality model,including(1)a link between the growth and decay of SAV and the nutrient pool of the water quality model;(2)a link between the photosynthesis and respiration of SAV and dissolved oxygen dynamics,and(3)the ways in which settling of particulate organic matter and nutrient uptake affect nutrient levels in the water column and in the sediment ***:Total suspended solids affect light attenuation and are another major driving factor for SAV growth in the nearshore and littoral zone *** model performs reasonably well in reproducing the spatial distribution of ***:The theoretical analysis and model sensitivity tests indicate that SAV growth is primarily controlled by light and *** light available for SAV growth depends on the water depth and the *** this full scale simulation,the water depth comes from the LOEM hydrodynamic model,and the turbidity depends on the suspended sediment concentration and algal concentration.

关键词： Submerged aquatic vegetation(SAV) SAV modeling Lake Okeechobee Long term simulation

Porphyrin-based heterogeneous photocatalysts for solar energy conversion

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Chinese Chemical Letters 2022年第1期33卷 33-60页

作者： Yuheng Zhang kang ren Lu Wang Lin Wang Zhuangjun Fan State Key Laboratory of Heavy Oil Processing School of Materials Science and EngineeringChina University of Petroleum(East China)Qingdao 266580China

In recent years,porphyrins with a similar structure to chlorophyll are often used as photosensitizers or reaction centers to improve the light absorption capacity or catalytic selectivity of existing photocatalytic ***,photocatalytic reactions include photoelectric conversion,photocarrier transport,and surface reaction,which requires the overall design of porphyrin-based *** this paper,the research work of porphyrin molecular design in heterogeneous photocatalysis in recent years is ***,the application of interface control and spatial confinement effect in porphyrin-based hybrid photocatalyst is ***,the future development direction of porphyrin-based photocatalysts is prospected and the main challenges in the research of porphyrin-based photocatalysts are given.

关键词： Porphyrin Photocatalyst Molecular design Interface engineering Organic framework

Design of layered-stacking graphene assemblies as advanced electrodes for supercapacitors

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Particuology 2022年第1期20卷 1-13页

作者： Bin Qi kang ren Yueqiang Lin Su Zhang Tong Wei Zhuangjun Fan State Key Laboratory of Heavy Oil Processing School of Materials Science and EngineeringChina University of PetroleumQingdao 266580PR China Key Laboratory of Energy Materials Chemistry Ministry of EducationKey Laboratory of Advanced Functional MaterialsAutonomous RegionInstitute of Applied ChemistryCollege of ChemistryXinjiang UniversityUrumqi 830046PR China

Graphene is a competitive electrode material for supercapacitors due to its unique two-dimensional structure,large surface area,high conductivity,and good physicochemical ***,random agglomeration and restacking of graphene sheets result in a reduced surface area and a loose structure with low density,which severely restricts the application for high gravimetric/volumetric energy density *** design of the layered-stacking structure of graphene assemblies can effectively prevent the restacking of graphene sheets,construct efficient ion transport channels,and improve spatial utilization,demonstrating the huge potential for developing advanced electrode ***,from the aspect of improving the electrochemical kinetics through designing efficient electron and ion transport paths,we first highlight the advantages of layered-stacking graphene assemblies,describe some common routes for preparing graphene building units,and then summarize the novel methods to design layered-stacking structures.A comprehensive review of the typical structure including nanocarbon pillared graphene,porous graphene blocks,and graphene ribbon films is provided with a focus on the mechanisms behind the performance ***,critical challenges and some general ideas for future development are proposed,which may open up new opportunities for material chemistry and device innovation.

关键词： Supercapacitor Graphene Layered-stacking structure Pillar Electrochemical kinetic

Timing of convalescent plasma therapy-tips from curing a 100-yearold COVID-19 patient using convalescent plasma treatment: A case report

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World Journal of Clinical Cases 2021年第12期9卷 2890-2898页

作者： Bo Liu kang-kang ren Nian Wang Xin-Ping Xu Jue Wu Department of Laboratory Hospital No.967 of PLADalian 116000Liaoning ProvinceChina Department of Laboratory Guanggu Branch of Hubei Maternal and Child Health HospitalWuhan 430073Hubei ProvinceChina Gaoxin Hospital The First Affiliated Hospital of Nanchang UniversityNanchang 330006Jiangxi ProvinceChina GrandOmics Diagnostics Co. LtdWuhan 430073Hubei ProvinceChina Translational Medicine Research Center Medical Innovation Research Division of Chinese PLA General HospitalBeijing 100853China

BACKGROUND Convalescent plasma therapy is used for the treatment of critically ill patients for newly discovered infectious diseases,such as coronavirus disease 2019(COVID-19)pneumonia,under the premise of lacking specific treatment drugs and corresponding *** the best timing application of plasma therapy and whether it is effective by antiviral and antibiotic treatment remain *** SUMMARY We describe a patient with COVID-19,a 100-year-old,high-risk,elderly male who had multiple underlying diseases such as stage 2 hypertension(very high-risk group)and infectious pneumonia accompanied by chronic obstructive pulmonary disease and *** mainly describe the diagnosis,clinical process,and treatment of the patient,including the processes of two plasma transfusion *** This provides a reference for choosing the best timing of convalescent plasma treatment and highlights the effectiveness of the clinical strategy of plasma treatment in the recovery period of patients with COVID-19 pneumonia.

关键词： COVID-19 Convalescent plasma therapy Treatment Elderly Timing Case report

Application and validation of a 3-D calcium,chloride,and sulfate model in Lake Okeechobee

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Ecological Processes 2014年第1期3卷 1-19页

作者： kang-ren Jin Mark D Shafer Zhen-Gang Ji Lead Scientist South Florida Water Management DistrictP.O.Box 24680West Palm BeachFL 33416-4680USA Senior Environmental Engineer US Army Corps Engineers701 San Marco BlvdJacksonvilleFL 32207-8175USA Adjunct Professor Department of Civil EngineeringCatholic University of AmericaPangborn HallRoom G12WashingtonDC 20064USA

Introduction: The calibration, verification, and validation of calcium (Ca), chloride (Cl), and sulfate (SO_(4)) module ofthe Lake Okeechobee Environment Model (LOEM) was completed. The integrated model could simulate Ca, Cl, andSO_(4) concentrations and transport due to wind driven currents and waves from 1 Oct 1999 to 30 Sept 2009 in LakeOkeechobee. The enhanced model was also used to estimate lake water quality effects resulting from differentmanagement scenarios that include discharges from planned aquifer storage and recovery (ASR) ***: The fate and transport processes of Ca, Cl, and SO_(4) are controlled by their reactivity and their hydrodynamictransport. Reactivity includes chemical, biological, and bio-uptake processes (IJRSA 33:2233-2260, 2012). Hydrodynamictransport includes advection of water current, diffusion, and turbulent mixing within the water column. The depositionand resuspension on the water-sediment bed interface is also included. The mathematical equations for describing Ca,Cl, and SO_(4) substances, including heavy metal and total organic carbon (TOC), are ***: Both the statistical results and the time series comparisons indicate that the simulation of Ca, Cl, and SO_(4) aregenerally simulated well by the LOEM. The root mean square error over the variance rage is Cl <18%, Ca <35%, andSO_(4) < 19%.Conclusions: Cl, Ca, and SO_(4) concentrations in the lake were largely controlled by water temperature and lakeevaporation. Inflows to the lake can also have localized effects on chloride variations. Shallow water depth and highevaporation contribute to high Cl/Ca/ SO_(4) concentration in the lake.

关键词： Ca Cl SO_(4)modeling Lake Okeechobee Long-term simulation Environmental modeling

The Effect of Nb on Mechanical Properties of Quenching and Partitioning Steels

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Journal of Iron and Steel Research International 2011年第S1期18卷 306-309页

作者： ZHU Shuai,kang Yong-lin,ren kang-kang,WANG Chuan (School of Materials Science and Engineering.University of Science and Technology Beijing,Beijing 100083,China) Univ Sci & Technol Beijing Sch Mat Sci & Engn Beijing 100083 Peoples R China

In order to study the effect of alloy elements on mechanical properties of quenching and partitioning steels,the Q and P heat treatments on different chemical composition steels were carried on in *** tensile test results indicated the strength of Nb+Ti-bearing steel was not increasing as expected,but lower than that of the Nb+Ti-free steel,and the elongation was raised to 26% from 9%.The Nb+Ti-bearing steel microstructures after tensile test were detected by TEM and found a certain amount of twins in the deformed microstructure while the deformed microstructure mainly was lath martensite in Nb+Ti-free steel,which means the addition of Nb and Ti elements could cause the twinning induced plasticity by inhibiting the phase transformation from austenite to *** on above analysis,adding trace Nb element could greatly increase the stacking fault energy of the retained austenite,which is beneficial to the formation of twins,and the formation of twins would lower the strength slightly and raise the elongation drastically.

关键词： quenching and partitioning twinning induced plasticity niobium stacking fault energy