• Title, Summary, Keyword: Electrode

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Characteristics of Chlorine-Based Oxidant Production on Insoluble Electrode (불용성 전극의 염소계 산화제 생성 특성)

  • Park, Mi-Jung;Lee, Taek-Soon;Kang, Meea
    • Journal of Korean Society of Water Science and Technology
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    • v.25 no.6
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    • pp.27-34
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    • 2017
  • The electrochemical water treatment process using the insoluble electrode, the chemical reaction occurs through the electrode, which is the most important factor determining the water treatment ability and treatment efficiency of the electrode. The performance characteristics of the electrode vary greatly depending on various parameters of the manufacturing process, and the oxidant generation characteristics and the current efficiency are different depending on the material of the catalyst electrode layer of the electrode. The effects of the material and composition of the catalyst electrode layer on the chlorine oxidizer formation characteristics were evaluated in order to improve the utilization of the insoluble electrode as a water treatment electrode. The ruthenium dioxide ($RuO_2$) electrode, the iridium dioxide ($IrO_2$) electrode, the platinum (Pt) electrode, and the mixed metal oxide electrode (MMO) are used in the platinum-based insoluble electrode used in the water treatment. In this study, it was confirmed that the ruthenium-based catalyst electrode layer was the most effective, especially the electrode containing palladium was more excellent as a result of comparing the production characteristics of the chlorine-based oxidizing agent for the single material electrode and the composite material electrode.

Electrochemical Properties of Carbon Nano-Tube Electrode (탄소나노튜브 전극의 전기화학적 특성)

  • Lee Dong-Yoon;Koo Bo-Kun;Lee Won-Jae;Song Jae-Sung;Kim Hyun-Ju
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.54 no.4
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    • pp.139-143
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    • 2005
  • For application of carbon nano-tube (CNT) as a counter electrode materials of dye-sensitized solar cell (DSSC), the electrochemical behavior of CNT electrode was studied, employing cyclic-voltammetry (C-V) and impedance spectroscopy. Fabrication of CNT-paste and formation of CNT-counter electrode for characteristic measurement have been carried out using ball-milling and doctor blade process, respectively. Unit cell for measurements was assembled using Pt electrode, CNT electrode, and iodine-embedded electrolyte. Field emission-scanning electron microscopy (FE-SEM) was used for structural investigation of CNT powder and electrode. Sheet resistance of electrode was measured with 4-point probe method. Electrochemical properties of electrode, C-V and impedance spectrum, were studied, employing potentiogalvanostat (EG&G 273A) and lock in amplifier (EG&G 5210). As a results, the sheet resistance of CNT electrode is almost similar to that of F-doped SnO2 (FTO) coated glass substrate as approximately 10 ohm/sq. From C-V and impedance spectroscopy measurements, it was found that CNT electrode has high reaction rate and low interface reaction resistance between CNT surface and electrolyte. These results provides that CNT electrode were superior to that of conventional Pt electrode. Particularly, the reaction rate in the CNT electrode is about thrice high than Pt electrode. Therefore. CNT electrode is to be good candidate material for counter electrode in DSSC.

A Study on Feature Extraction of Partial Discharge Type Using Wavelet Transform (웨이블렛변환을 이용한 부분방전 종류의 특징추출에 관한 연구)

  • Park, Jae-Jun
    • The Journal of Information Technology
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    • v.6 no.1
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    • pp.65-70
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    • 2003
  • In this papers, we proposed the new method in order to diagnosis partial discharge type of transformers. For wavelet transform, Daubechie's filter is used,, we can obtain wavelet coefficients which is used to extract featrue of statistical parameters(maximum value, average value, dispersion, skewness, kurtosis) about high frequency current signal per 3-electrode type(needle-plane electrode, IEC electrode and Void electrode). Also, these coefficients are used to identify signal of internal partial discharge in transformer. As a result, from compare of high frequency current signal amplitude and average value, we are obtained results of IEC electrode> Void electrode> Needle-Plane electrode. Otherwise, in case of skewness and kurtosis, we are obtained results of Void electrode> IEC electrode> Needle-Plane electrode. As improved method in order to diagnosis partial discharge type of transformers, we use neural network.

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Analysis of Electrical Resistivity Characteristics of Concrete by Using Flat Electrode Method (평판접지 전극방법을 이용한 콘크리트의 전기비저항 특성 분석)

  • Park, Chang Seon;Park, Hae Won;Lee, Kang Hun;Jeong, Jin Hoon
    • International Journal of Highway Engineering
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    • v.19 no.3
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    • pp.57-63
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    • 2017
  • PURPOSES : The pole electrode method damaged the concrete pavement on inserting the electrode into the pavement surface. This study examined the feasibility of the flat electrode method to observe the concrete pavement instead of the pole electrode method and analyzed the resistivity characteristics of the concrete by performing laboratory tests. METHODS : The resistivity of the concrete specimens manufactured with three different mixing ratios (38.50%, 39.50%, and 40.50%) were measured using the pole and flat electrode methods according to the concrete age (7 and 28 days) and electrode spacing (20 mm, 30 mm, and 40 mm). RESULTS :In both pole and flat electrode methods, the resistivity increased with increasing fine aggregate proportion regardless of the concrete age. The resistivity measured at a concrete age of 28 days was slightly larger than that measured at 7 days. In the case of a concrete age of 7 days, the resistivity measured by the flat electrode method was larger than that measured by the pole electrode method. The difference disappeared at 28 days. CONCLUSIONS :The results suggest that the flat electrode method can replace the pole electrode method because the resistivity measured by both methods was similar. Hence, the development of a technology to apply the flat electrode method to actual concrete pavement is necessary.

Trial Manufacture and Characteristics of a Multi-discharge Type ozonizer(I) (다중방전형 오존발생기의 試作 및 特性(I))

  • Song, Hyeon-Jik;Lee, Gwang-Sik;Park, Won-Ju;Lee, Dong-Heon;Kim, Geum-Yeong;Kim, Lee-Guk
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.48 no.7
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    • pp.533-541
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    • 1999
  • Multi-discharge type ozonizer(MDO) using superposed silent discharge has been designed and manufactured. It consists of three electrodes( central electrode, internal electrode, and external electrode ) and double gaps( gap between central electrode and internal electrode, gap between internal electrode and external electrode ). Therefore, ozone is generated by superposing silent discharges generated between the gaps respectively. And the MDO consists of three types of superposed discharge ozonizers according to voltage appling method for each electrode ; A.C. high voltages are applied two of three electrodes with phase difference of 180[˚], the other electrode is a ground. This paper describes that discharge and ozone generation characteristics of MDO which comprising central electrode and internal electrode applied A.C. high voltages with phase difference of 180[˚] respectively, and the grounded external electrode. As a result, the maximum ozone concentration, generation, and yield can be obtained 10208[ppm], 6.4[g/h], and 280[g/kwh] respectively.

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Fabrication of Electrochemical Sensor with Tunable Electrode Distance

  • Yi, Yu-Heon;Park, Je-Kyun
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.5 no.1
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    • pp.30-37
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    • 2005
  • We present an air bridge type electrode system with tunable electrode distance for detecting electroactive biomolecules. It is known that the narrower gap between electrode fingers, the higher sensitivity in IDA (interdigitated array) electrode. In previous researches on IDA electrode, narrower patterning required much precise and expensive equipment as the gap goes down to nanometer scale. In this paper, an improved method is suggested to replace nano gap pattering with downsizing electrode distance and showed that the patterning can be replaced by thickness control using metal deposition methods, such as electroplating or metal sputtering. The air bridge type electrode was completed by the following procedures: gold patterning for lower electrode, copper electroplating, gold deposition for upper electrode, photoresist patterning for gold film support, and copper etching for space formation. The thickness of copper electroplating is the distance between upper and lower electrodes. Because the growth rate of electroplating is $0.5{\mu}m\;min^{-1}$, the distance is tunable up to hundreds of nanometers. Completed electrodes on the same wafer had $5{\mu}m$ electrode distance. The gaps between fingers are 10, 20, 30, and $40{\mu}m$ and the widths of fingers are 10, 20, 30, 40, and $50{\mu}m$. The air bridge type electrode system showed better sensitivity than planar electrode.

Partial Discharge Characteristics of XLPE According to Electrode Shape and Void (전극형상 및 보이드에 따른 XLPE의 부분방전 특성)

  • Shin, Jong-Yeol;Kim, Guin-sik;Hong, Jin-Woong
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.29 no.1
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    • pp.50-57
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    • 2016
  • Transmission equipment is mainly used for the XLPE (cross-linked polyethylene) insulation cable for ultra high voltage power to minimize power loss. The experiment examined the partial discharge characteristics according to the insertion of the bar electrode and needle electrode into the XLPE specimen and the air voids. XLPE insulation cable manufactured by T. company and tungsten electrode material by K. company were used for specimens, by adhering conductive tape on the semi-conductive material of the lower electrode of XLPE specimen with the dimension of $16{\times}40{\times}30$ [mm] was used as negative electrode. In order to investigate the PD with ${\phi}$-q-n of XLPE specimen according to the electrode shape and the size of air voids. we examined the PD by varying the voltage after applying voltage of 3~20 kV on the electrode. Therefore, it was confirmed from the result of PD characteristics of specimen that the larger the air void than the gap between electrode (+) and electrode(-), the larger effect on the discharge when the bar electrode and needle electrode inserted into XLPE, and the closer the distance between the insulation and the needle electrode, the faster insulation breakdown.

Development of CCFL with Nb/Ni Gad Electrode for high efficiency (Nb/Ni Clad 전극을 이용한 고효율 CCFL 개발)

  • Park, Ki-Duck;Yang, Seong-Su;Park, Doo-Sung;Kim, Seo-Yoon;Lim, Young-Jin
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.441-443
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    • 2005
  • According as CCFL(Cold Cathode Fluorescent lamp) of light source in Backlight unit for Note PC (Personal computer) is presently needed to low power consumption and long life time, the development focus of CCFL is going on the discharge gas, phosphor and electrode material. First of all, discharge voltage characteristic of CCFL is closely connected with electrode material For low discharge voltage, the characteristic of electrode material is needed to low work function, low sputtering ratio and superior manufacturing property. We developed new CCFL with Nb/Ni Clad electrode superior to conventional CCFL. Because Nb/Ni Clad electrode with Ni material and Nb material, the electrical characteristic is superior to other electrode materials. The electrode of Nb/Ni Clad is composed that Ni of outside material has superior manufacturing property and Nb of inside material has low work function. Nb/Ni Clad of new electrode material is made by process of Rolling mill at high pressure and heat treatment. We compared electrical characteristic of Nb/Ni clad electrode with conventional Mo electrode by measurement. Mo electrode and Nb/Ni Clad electrode of cup type with diameter 1.1 mm and length 3.0mm are used to this experiment. Material content of Mo electrode is Mo 100%. But, Nb/Ni Clad electrode is composed by content of Nb 40% and Ni 60%. The result of comparison measurement between new CCFL with Nb/Ni Clad electrode and conventional CCFL was appeared that CCFL with Nb/Ni Clad electrode had superior characteristic than conventional CCFL. As a result of experiment, we completed Note PC with low power consumption and long life time by application of new CCFL with Nb/Ni Clad electrode.

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I-V characteristics of ground electrode fabricated using an aluminium scrap (알루미늄 스크랩을 이용하여 제작한 접지 전극의 전압-전류 특성)

  • 이우선;정용호;박진성
    • Electrical & Electronic Materials
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    • v.9 no.8
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    • pp.806-812
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    • 1996
  • I-V characteristics of ground electrode fabricated using an aluminium scrap are presented. We fabricated several shapes of aluminium scraps and aluminium electrodes. The results show that the current of aluminium electrode increased linearly by the voltage increase. AC breakdown voltage of copper plate electrode was higher than that of aluminium electrode. AC breakdown current of aluminium electrode was higher than that of copper plate electrode. As applied voltage increased, grounding resistance of aluminum electrode decreased linearly.

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