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페놀계 활성탄소섬유 전극과 수용성 전해질을 사용하는 전기이중층 캐패시터의 비축전용량 특성
김태환,김정덕,김권일,안계혁,김종휘 한국공업화학회 1998 응용화학 Vol.2 No.1
For the electric double layer capacitors(ELDC) made of phenol based activated carbon fiber(ACF) electrodes and aqueous electrolytes, the specific capacitance characteristics has been investigated with respect to different specific surface area of electrodes and different kinds of aqueous electrolytes. Throughout charge-discharge cell tests, it has been shown that larger surface area of electrodes and higher ion mobility of electrolytes have better specific capacitances. Also, it has been found that 1200℃ heat treatment of the electrode is effective to improve the specific capacitance over 140F/g.
Kim, Yong Il,Lee, Yun Jung,Yoo, Jungjoon,Kim, Jong-Huy Elsevier 2019 Journal of Power Sources Vol.438 No.-
<P><B>Abstract</B></P> <P>Depletion of fossil-fuel energy resources creates a demand for sustainable energy technologies and therefore necessitates the development of sustainable energy storage devices with sustainable materials, eco-efficient synthetic methods, and robust cycle life. Electric double layer capacitors are potential candidates for sustainable energy storage because they usually employ carbon-based electrode materials with semi-permanent lifetimes and high powers. Although various carbon materials are commercially available, new methods are needed to produce eco-efficient synthesized carbon materials with high performances. Herein, we introduce an effective strategy that uses biomaterials as carbon sources and adopts a reusable KOH solution soaking method for the activation process to reduce KOH consumption, which includes a pore-size control process to enhance electrochemical performances. The obtained bio-carbons exhibit specific capacitances (160.6 and 151.2 F g<SUP>−1</SUP> in aqueous and organic electrolytes, respectively) superior to that of commercially available activated carbon (~80 F g<SUP>−1</SUP>), which is attributed to the synergetic effect between the pore-size-controlled activated carbon for efficient ion transport and the well-matched electrolyte. Our strategy provides a versatile method for the scalable fabrication of sustainable energy storage materials and is promising for the development of high-performance supercapacitors.</P> <P><B>Highlights</B></P> <P> <UL> <LI> •Activated bio-carbons for sustainable energy storage were prepared </LI> <LI> •Physical properties of the pore-size controlled materials were evaluated </LI> <LI> •Activated carbon electrodes were applied in electric double-layer capacitors </LI> <LI> •The electrodes showed excellent capacitance in aqueous and organic electrolytes </LI> <LI> •The large specific surface area and ion-matched pore size were key to performance </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Kim, Donghee,Choi, Hyeung-Sik,Kim, Joon-Young,Park, Jong-Hyeon,Tran, Ngoc-Huy Korean Society for Precision Engineering 2015 International Journal of Precision Engineering and Vol.16 No.7
An Underwater Vehicle-Manipulator System (UVMS) can be applied to pick up and carry objects for autonomous manipulation in the water. However, it is difficult to control the motion of the whole system because the movement of a manipulator affects the motion of the vehicle and vice versa. Additionally, a lack of information about the object, such as the shape and inertia, makes motion control even more difficult. In the current paper, a motion control algorithm of the UVMS with redundancy was developed to guarantee the stability robustness when the mass information of the objects is not available. In order to generate the joint trajectories of the manipulator, a redundancy resolution was performed to minimize the restoring moments acting on the vehicle. This means the propulsion energy for controlling the vehicle's motion can be reduced. To control the motion of the system with an unknown parameter, a controller based on the sliding mode theory has been designed. Finally, the effectiveness of the proposed method was verified through a series of simulation for a 3DOF vehicle-3DOF manipulator system.
Kim, Won Jae,Le, Van Phuc,Lee, Hyun Jong,Phan, Huy Thien Elsevier BV 2017 Construction and Building Materials Vol.149 No.-
<P><B>Abstract</B></P> <P>In this study, a rutting model in power law form was proposed considering the shear stress to strength ratio which can be calculated in terms of cohesion (c) and internal friction angle (ϕ) for different asphalt mixtures. Predictive equations for c and ϕ were first developed from laboratory testing at a reference temperature of 50°C using multiple regression analyses considering asphalt binder, aggregate and volumetric properties of different asphalt mixes. The predictive c and ϕ equations were found to have correlation coefficients of 0.87 and 0.86 respectively. The rutting model considers the number of load cycles (N), shear strength ratio, temperature and load duration as main parameters of the permanent strain wherein the coefficients were determined using tri-axial compressive strength and repeated load permanent deformation testing. It was calibrated using field rutting data from twenty-six Westrack pavement sections. Moreover, the rutting model was validated using field performance data obtained from Korean national highways’ long term pavement performance database. It was found from the validation that the model can accurately estimate rut depths under varying load and environmental conditions in the fields.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A rutting model in power law form was proposed. </LI> <LI> The model considers shear stress to strength ratio. </LI> <LI> Predictive equations for cohesion (c) and internal friction angle (ϕ) were developed. </LI> <LI> A rutting model was calibrated and validated using field rutting data. </LI> <LI> The model accurately estimate rut depths under varying load and environmental conditions. </LI> </UL> </P>
페놀계 활성탄소섬유 전극과 유기성 전해질을 사용하는 전기이중층 캐패시터의 비축전용량 특성
김태환,김정덕,안계혁,김종휘 한국공업화학회 1998 응용화학 Vol.2 No.1
For the electric double layer capacitors(ELDC) made of phenol based activated carbon fiber(ACF) electrodes and organic electrolytes, the specific capacitance characteristics has been investigated with respect to different specific surface area of electrodes and different kinds of organic electrolytes. Throughout charge-discharge cell tests, it has been found that larger surface area and larger pore diameter of electrodes contribute to increase the specific capacitance. Binary mixture of organic solvent with 1M-propylenecabonate(PC) and 1M-tetrahydrofuran(THF) for 1M-LiClO₄ electrolyte has a higher specific capacitance than single solvent of 1M-PC or mixed solvent with 1M-PC and 1M-diethylcabonate(DEC). Also, even though 1M-tetraethyl-amoniumperclorolate(1M-TEAPC) of organic electrolyte shows higher specific capacitance, it has longer charge time because of its lower ion mobility.