• Title, Summary, Keyword: Activated carbon electrode

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Preparation of Electrode Coated with Activated Carbon for Dust Removal (분진제거를 위한 활성탄 전극판의 제조)

  • Kim, Kwang Soo;Park, Jung O;Jun, Tae Hwan;Kim, Ilho
    • Journal of Korean Society of Environmental Engineers
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    • v.35 no.11
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    • pp.815-820
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    • 2013
  • The purpose of this research is to prepare the aluminum electrode coated with activated carbon for removing air pollution dust. The experiments were studied on the selection of optimal polymer for binding aluminum plate with powdered activated carbon, preventing the pore blocking of activated carbon from polymer binder, and the dust treatability for the prepared activated carbon electrode. The optimal adhesive for coating activated carbon on an electric aluminum plate was polyvinyl acetate (PVA) with vinyl functional group. For the opening of the blocked pore with polymer, it was very effective to embed polymer solvent in pore of activated catbon firstly before mixing activated carbon with PVA, and then to devolatilize the embedded solvent of carbon pore at high temperature. The mass of trapped dust on aluminum electrode coated with activated carbon was about double of the trapped one on just aluminum electrode.

Preparation of Gas Sensor from Pitch-based Activated Carbon Fibers and Its Toxic Gas Sensing Characteristics (피치계 활성탄소섬유기반 가스센서 제조 및 유해가스 감응 특성)

  • Kim, Min Il;Lee, Young-Seak
    • Applied Chemistry for Engineering
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    • v.25 no.2
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    • pp.193-197
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    • 2014
  • The electrode for gas sensor was prepared by using pitch-based activated carbon fibers and polyvinyl alcohol (PVA) to investigate the toxic gas sensing characteristics. The physicochemical properties of activated carbon fibers electrode for gas sensor were analyzed with SEM and BET. Toxic gases sensing property of the electrode was also identified by different toxic gases such as $NH_3$, NO and $CO_2$. The specific surface area of activated carbon fibers electrode for gas sensor was decreased by 33% owing to PVA used as a binder compared with the activated carbon fibers. However, its pore size distribution of the ACF electrode was not greatly influenced by PVA. The activated carbon fibers electrode for gas sensor responded to toxic gases by electron hopping unlike semiconductor based gas sensors. In this study, activated carbon fibers electrode was decreased to 7.5% in resistance for the NH3 gas of the 100 ppm concentration and its $NH_3$ gas sensing property was confirmed the most excellent compared with other toxic gases.

Electrosorption Behavior of $TiO_2$/Activated Carbon Composite for Capacitive Deionization (축전식 이온제거에 대한 $TiO_2$/Activated Carbon 화합물의 전기흡착 거동)

  • Lee, Jeong-Won;Kim, Hong-Il;Kim, Han-Joo;Park, Soo-Gil
    • Applied Chemistry for Engineering
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    • v.21 no.3
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    • pp.265-271
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    • 2010
  • Desalination effects of capacitive deionization (CDI) process was studied using $TiO_2$/activated carbon electrode. In order to enhance the wettability of electrode and decrease a electrode resistance, $TiO_2$ was coated on activated carbon. By means of $TiO_2$ coating on activated carbon, electric double layer to adsorption content in CDI process was increased. It was identified from TEM, XRD, and XPS that the activated carbon based on $TiO_2$ composite was fabricated successfully by means of sol-gel method. As a results of cyclic voltammetry and impedance, it was identified that $TiO_2$/activated carbon electrode has more electric double later capacitance and less diffusion resistance than activated carbon. Also charge-discharge and ion conductivity profiles showed that the ion removal ratios of $TiO_2$/activated carbon electrode in NaCl electrolyte of $1000\;{\mu}S/cm$ more increased about 39% than that of activated carbon. In conclusion it was possible to identify that the carbon electrode coated $TiO_2$ as electrode material was more effective than raw carbon electrode.

Electrochemical Properties of EDLC Electrodes Prepared by Acid and Heat Treatment of Commercial Activated Carbons

  • Wu, Jin-Gyu;Hong, Ik-Pyo;Park, Sei-Min;Lee, Seong-Young;Kim, Myung-Soo
    • Carbon letters
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    • v.9 no.2
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    • pp.137-144
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    • 2008
  • The commercial activated carbons are typically prepared by activation from coconut shell char or coal char containing lots of inorganic impurities. They also have pore structure and pore size distribution depending on nanostructure of precursor materials. In this study, two types of commercial activated carbons were applied for EDLC electrode by removing impurities with acid treatments, and controlling pore size distribution and contents of functional group with heat treatment. The effect of the surface functional groups on electrochemical performance of the activated carbon electrodes was investigated. The initial gravimetric and volumetric capacitance of coconut based activated carbon electrode which was acid treated by $HNO_3$ and then heat treated at $800^{\circ}C$ were 90 F/g and 42 F/cc respectively showing 94% of charge-discharge efficiency. Such a good electrochemical performance can be possibly applied to the medium capacitance of EDLC.

Electrochemical Performance of Activated Carbon Electrode Materials with Various Post Treatments for EDLC (활성탄의 후 처리에 의한 EDLC 전극재의 전기화학 성능 개선)

  • Lee, Eunji;Kwon, Soon Hyung;Choi, Pooreum;Jung, Ji Chul;Kim, Myung-Soo
    • Korean Journal of Materials Research
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    • v.24 no.6
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    • pp.285-292
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    • 2014
  • Commercial activated-carbon used as the electrode material of an electric double-layer capacitor (EDLC) was posttreated with various acids and alkalis to increase its capacitance. The carbon samples prepared were then heat-treated in order to control the amount of acidic functional groups formed by the acid treatments. Coin-type EDLC cells with two symmetric carbon electrodes were assembled using the prepared carbon materials and an organic electrolyte. The electrochemical performance of the EDLC was measured by galvanostatic charge-discharge, cyclic voltammetry, and electrochemical impedance spectroscopy. Among the various activated carbons, the carbon electrodes (CSsb800) prepared by the treatments of coconutshell-based carbon activated with NaOH and $H_3BO_5$, and then heat treated at $800^{\circ}C$ under a flow of nitrogen gas, showed relatively good electrochemical performance. Although the specific-surface-area of the carbon-electrode material ($1,096m^2/g$) was less than that of pristine activated-carbon ($1,122m^2/g$), the meso-pore volume increased after the combined chemical and heat treatments. The specific capacitance of the EDLC increased from 59.6 to 74.8 F/g (26%) after those post treatments. The equivalent series resistance of EDLC using CSsb800 as electrode was much lower than that of EDLC using pristine activated carbon. Therefore, CSsb800 exhibited superior electrochemical performance at high scan rates due to its low internal resistance.

Desalination Effects of Capacitive Deionization Process Using Activated Carbon Composite Electrodes (활성 탄소 복합 전극을 이용한 Capacitive Deionization 공정의 제염 효과)

  • Lee, Jeong-Won;Kim, Hong-Il;Kim, Han-Joo;Shin, Hyun-Soo;Kim, Jeong-Sik;Jeong, Boong-Ik;Park, Soo-Gil
    • Journal of the Korean Electrochemical Society
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    • v.12 no.3
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    • pp.287-294
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    • 2009
  • Desalination effects of Capacitive deionization(CDI) process using activated carbon $TiO_2$ composite electrode. In this study, we made the activated carbon electrod and activated carbon $TiO_2$ composite electrode, which analysed at cyclic voltammetry and charge-discharge. The results measured for discharge capacitance in cyclic voltammetry were 125 F/g in activated carbon electrode and capacitance of activatd carbon composite electrode was increased about two time, 243 F/g. The $TiO_2$ content of activated carbon composite electrode was 10 wt.%. When it was added wtih TiO2, electric double layer adsorption content was increased, so it was increased 25% in ion removal ratio of activated carbon electrode.

Supercapacitive Properties of Composite Electrode Consisting of Activated Carbon and Di(1-aminopyrene)quinone

  • Kim, Kwang Man;Lee, Young-Gi;Park, Jeong Ho;Ko, Jang Myoun
    • ETRI Journal
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    • v.38 no.2
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    • pp.252-259
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    • 2016
  • Di(1-aminopyrene)quinone (DAQ) as a quinone-containing conducting additive is synthesized from a solution reaction of 1-aminopyrene and hydroquinone. To utilize the conductive property of DAQ and its compatibility with activated carbon, a composite electrode for a supercapacitor is also prepared by blending activated carbon and DAQ (3:1 w/w), and its supercapacitive properties are characterized based on the cyclic voltammetry and galvanostatic charge/discharge. As a result, the composite electrode adopting DAQ exhibits superior electrochemical properties, such as a higher specific capacitance of up to $160F{\cdot}g^{-1}$ at $100mV{\cdot}s^{-1}$, an excellent high-rate capability of up to $1,000mV{\cdot}s^{-1}$, and a higher cycling stability with a capacitance retention ratio of 82% for the 1,000th cycle.

Electrochemical Characteristics of $LiCoO_2$+Activated Carbon Electrode for Supercapacitor (Supercapacitor용 $LiCoO_2$+Activated Carbon 전극의 전기화학적 특성)

  • Jeon, Min-Je;Kim, Ick-Jun;Lee, Sun-Young;Kim, Hyun-Su;Im, Young-Tek;Le, Sang-Hyun;Lee, Moon-Bae;Oh, Dae-Hee
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.336-337
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    • 2005
  • This study shows the effect of addition of $LiCoO_2$, with different milling time ranging from 0, 30, 200 hours, to the activated carbon electrode. Test cells consisting of activated carbon (100-X%) and $LiCoO_2$ (X%)were made (where X=10, 20, and 40). Test cells with varying concentrations of $LiCoO_2$ which differ in the milling time showed improved specific capacity compare with the cells fabricated using activated carbon alone. The enhanced capacity may be caused due to the addition of $LiCoO_2$ powders at varying concentration. An improved ESR value obtained may be caused by the smaller particle size of $LiCoO_2$. It was concluded that finer the particle size higher will be the efficiency.

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Electrochemical Characteristics of the Activated Carbon Electrode Modified with the Microwave Radiation in the Electric Double Layer Capacitor (전기이중층캐패시터에서 마이크로파에 의해 개질된 활성탄소전극의 전기화학적 특성)

  • Sun, Jin-Kyu;Um, Eui-Heum;Lee, Chul-Tae
    • Applied Chemistry for Engineering
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    • v.21 no.1
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    • pp.11-17
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    • 2010
  • Modifying surface of activated carbon for the electrode of EDLC with an organic electrolyte was investigated to improve the electrochemical performance of EDLC by the microwave radiation. Three kinds of activated carbons, prepared activated carbon from petroleum cokes and pitch cokes and commercial activated carbon BP-25, were used for this study. For all investigated activated carbons, hydrophilic functional groups-containing oxygen disappeared from the surface of activated carbon as microwave radiation. And as microwave radiation time was increased, the specific surface area and total pore volume of activated carbons were reduced and average pore diameter were increased. From theses effects, interfacial resistance of EDLC with the modified activated carbon electrode was drastically decreased, and discharge capacitance was increased although the specific surface area of activated carbon was reduced by this microwave radiation.

Electrochemical Properties of Electric Double Layer Capacitor Using Carbon Electrodes (Carbon 전극을 이용한 전기 이중층 캐패시터의 전기화학적 특성)

  • Bang, J.G.;Song, J.G.;Choi, S.A.;Park, G.C.;Gu, H.B.
    • Proceedings of the KIEE Conference
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    • pp.1609-1611
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    • 1997
  • We fabricated five type of electric double layer capacitor(EDLC) with extremely stable activated carbon as a positive and negative electrodes. The electrodes consisted of activated carbon and several different conductor layers on aluminium foil. Cyclic voltammogram of activated carbon electrodes at scan rate 5mV/sec was reversable redox reaction. The discharge capacity of activated carbon-KS 6 composite electrode was higher than that of activated carbon electrode without KS 6.

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