• Title/Summary/Keyword: Electrode form

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A Novel Pixel Structure for High Transmission TFT-LCD

  • Shin, Kyoung-Ju;Song, Se-Young;Lee, Il-Pyung;Kim, Chang-Hoon;Jang, Chang-Soon;Chai, Chong-Chul;Souk, Jun-Hyung
    • 한국정보디스플레이학회:학술대회논문집
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    • 2008.10a
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    • pp.208-210
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    • 2008
  • We have developed a LCD Panel that form storage capacitance for pixels between pixel electrode of bottom glass and common electrode of top glass. This method could make higher transmission and higher production yield than before by removing storage electrode line and capacitance on the bottom glass by simplifying bottom pixel structure.

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Electrodeposited Nano-flakes of Manganese Oxide on Macroporous Ni Electrode Exhibiting High Pseudocapacitance

  • Gobal, F.;Jafarzadeh, S.
    • Journal of Electrochemical Science and Technology
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    • v.3 no.4
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    • pp.178-184
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    • 2012
  • A porous nickel (P-Ni) substrate was prepared by selective leaching of zinc from pressed pellets containing powders of Ni & Zn in 4 M NaOH solution. Anodic deposition of manganese oxide onto the porous Ni substrate ($MnO_x$/P-Ni) formed nano-flakes of manganese oxide layers as revealed in SEM studies. Pseudocapacitance of this oxide electrode was evaluated by cyclic voltammetry (CV) and chronopotentiometry (CHP) in 2 M NaOH solution. The specific capacitance of the Mn oxide electrode was as high as 1515 F $g^{-1}$, which was ten times higher than Mn oxide deposited on a flat Ni-ribbon. 80% of capacity was retained after 200 charge/discharge cycles. The system showed no loss of activity in dry form over period of days. The impedance studies indicated highly conducting $MnO_x$/P-Ni substance and the obtained specific capacitance from impedance data showed good agreement with the charge/discharge measurements.

Characterization of Ionic-Polymer Metal Composite Actuators Varying Electroless Plating Method of Platinum (백금 무전해 도금 방법의 변화에 따른 이온성 고분자 및 금속 복합체 액추에이터의 특성 분석)

  • 차승은;김병목;조성환;이승기;박정호;김병규
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.51 no.12
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    • pp.601-607
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    • 2002
  • IPMC(Ionic Polymer Metal Composite)actuators were optimized for producing improved forces by changing multiple parameters including repetition of number of plating, surface electroding and additive(PVP)-treatment on reduction. The platinum electrode is deposited on the surface of the material where platinum particle stay in a dense form that appears to introduce a significant level of surface electrode resistance. Actuation tests were performed for such IPMC actuators under a low voltage. The test results show that the lower surface-electrode resistance generates higher actuation capability in the IPMC actuators. In order to investigate relaxation behavior of bending and repeatability in dry condition, the IPMC was coated by$rubber(KRATON^{TM})$to minimize the effect of water evaporation from IPMC. This actuator can be used in air with surface coating to avoid membrane drying.

A Study on the Displacement and Discharge Current Waveform in AC PDP (AC PDP의 변위전류 및 방전전류에 관한 연구)

  • Lee, Woo-Geun;Ha, Seok-Cheon;Lee, Sung-Hyun;Cho, Jung-Soo;Park, Chung-Hoo
    • Proceedings of the KIEE Conference
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    • 1997.11a
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    • pp.385-387
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    • 1997
  • This paper deals with the relationships between discharge current wave form and the structure of AC PDP cells. The Paschen minimum can be found in the range of $200{\sim}300\;torr$ under the condition of electrode width of $300{\mu}m$ and $100{\mu}m$ electrode gap. Furthermore, the charge current does not vary with the gas pressure, whereas the time delay in the discharge inception voltage decreased both peak and r.m.s discharge current increase with gas pressure and electrode width.

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Preparation and Electrochemical Properties of Carbon Cryogel for Supercapacitor

  • Song, Min-Seob;Nahm, Sahn;Oh, Young-Jei
    • Journal of the Korean Ceramic Society
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    • v.45 no.11
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    • pp.662-666
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    • 2008
  • Electrochemical properties of carbon cryogel electrode for the application of composite electrode materials mixed with metal oxide in supercapacitor have been studied. Carbon cryogels were synthesized by sol-gel polycondensation of resorcinol with form aldehyde, followed by a freeze drying, and then pyrolysis in an inert atmosphere. Physical properties of carbon cryogel were characterized by BET, X-ray diffraction (XRD) and scanning electron microscopy (SEM). It is found that carbon cryogel is amorphous material. The electrochemical properties of carbon cryogel were measured by cyclic voltammetry as a function of concentration of liquid electrolyte, galvanostatic charge-discharge with different scan rates and electrochemical impedance measurements. The result of cyclic voltammetry indicated that the specific capacitance value of a carbon cryogel electrode was approximately 150.2 F/g (at 5 mV/s in 6M KOH electrolyte).

Photoelectrochemical Deposition of CdZnSe Thin Films on the Se-Modified Au Electrode

  • Ham, Sun-Young;Jeon, So-Yeon;Lee, Ungki;Paeng, Ki-Jung;Myung, No-Seung
    • Bulletin of the Korean Chemical Society
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    • v.29 no.5
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    • pp.939-942
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    • 2008
  • Photoelectrochemical deposition of CdZnSe thin films on the Se-modified Au electrode using electrochemical quartz crystal microgravimetry (EQCM) and voltammetry is described. Corrosion of pre-deposited Se electrodes by illumination at a fixed potential resulted in $Se^{2-}$ species, which was manifest from the EQCM frequency changes. $Se^{2-}$ species generated from the photocorrosion reacted with $Cd^{2+}$ and $Zn^{2+}$ ions in the electrolyte to form CdZnSe films on the Au electrode. The effect of electrolyte composition on the composition and band gap of CdZnSe films was studied in detail. Also, photoelectrochemistry, EDX, Raman spectroscopy were used for the characterization of CdZnSe thin films.

Electrochemical Properties of Novel Metal Powder Electrodes for Polymer Electrolyte Membrane Electrolysis

  • Kim, Chang-Hee;Kang, Kyung-Soo;Park, Chu-Sik;Hwang, Gab-Jin;Bae, Ki-Kwang
    • Proceedings of the Korean Powder Metallurgy Institute Conference
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    • 2006.09b
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    • pp.1227-1228
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    • 2006
  • The electrochemical properties of novel metal powders were investigated for the electrode materias of polymer electrolyte memebrane electrolysis. Two types of Pt black and $IrO_2$ powder electrodes were hot-pressed on the polymer electrolyte membrane to form membrane electrode assembly. The galvanodynamic polarization methode was used to characterize the electrochemical properties of both electrodes. From the experimental results, we concluded that the $IrO_2$ powder electrode exhibits better electrochemical performance than Pt black as cathode material for the electrolysis.

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Studies on the Diffusion Current of Ideal Streaming Merury Electrode under Gravity (重力下의 理想噴出水銀電極의 擴散電流에 關한 硏究)

  • Kim, Hwang-Am;Jin, Chang-Hi
    • Journal of the Korean Chemical Society
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    • v.5 no.1
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    • pp.80-83
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    • 1961
  • Solution of the diffusion problem applicable to steady state reduction at the ideal streaming mercury electrode are presented, with special attention being given to the influence of stream contraction caused by the gravity. To eliminate the convection occurring in the layer between the streaming mercury and the electrolytic solution, a new method have been invented, in this case the solution being tested was streamed with same velocity of the streaming mercury. Experiment have been made in order to compare the experimental value with the theoretical value and the experimental diffusion current was approached more to the theoretical value than the value obtained by earlier form of the streaming mercury electrode used by Heyrovsky.

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The Determination of Corrective Coefficient for Ground Resistance about Variation of Soil Resistivity by Field Test (현장실증시험에 의한 대지저항률별 접지저항 보정계수의 결정)

  • Shim, Keon-Bo;Kim, Kung-Chul;Lee, Hyung-Su;Park, Jae-Duck;Park, Sang-Man
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2006.05a
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    • pp.288-292
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    • 2006
  • Usually, equations that calculate ground resistance of earth electrode was already informed well by form of earth electrode. But, when apply on the spot because general expressions are very insufficient at point that calculate exact ground resistance value by variation of earth electrode, and constant value that corrective coefficient for ground resistance calculation is fixed regardless of change of the earth resistivity specially is presented, it is actuality that difficulty is. Therefore, in this study, about these problem, proposed corrective coefficient for calculation of ground resistance according to change of the earth resistivity.

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Interference Coefficient of X axis for Electrodes using Variation of Plural Earth Electrodes (복수접지극의 변화에 따른 전극의 X축 간섭계수)

  • Kim Sung Sam;Kim Ju Chan;Song Won Pyo;Koh Hee Seog
    • Proceedings of the KIEE Conference
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    • summer
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    • pp.449-451
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    • 2004
  • In the building, there are a lot of electricity, electrodes, and communication equipment. Many of those equipment needs to earthing. Naturally, the earth electrodes are constructed in the site of a building. In such a situation, when electric current flows into a certain earthing system the potential of other earthing systems rises. That is, the potential interference will take place between the earth electrodes. The conventional study has been considered by only the relation of the distance between the earth electrodes using the potential distribution formula of earth surface. However, it is necessary to inquire strictly, taking the surface potential of electrodes by electrode form into consideration. In this paper, basic formula is deduced on the basis of both electrodes surface potential of earth electrode as a source of the potential interference and earth electrode which receives the potential interference.

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