• Title, Summary, Keyword: Electrode

Search Result 9,393, Processing Time 0.075 seconds

Electrochemical properties of Pt electrodes fabricated by other methode as counter electrode of DSC (염료감응형 태양전지의 상대전극용 Pt의 제조방법에 따른 전기화학적 특성)

  • Kim, Hyun-Ju;Lee, Dong-Yun;Koo, Bo-Kun;Lee, Won-Jae;Song, Jae-Sung
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.2016-2018
    • /
    • 2005
  • Dye-sensitized solar cell (DSC) consist of oxidation semiconduction electrode, electrolyte and counter electrode. Among these, Pt as counter electrode of DSC plays a role in helping redox reaction of iodine ions in electrolyte, also, transferring electrons into electrolyte. In this case, it is expected that characteristics of Pt electrodes strongly depend on fabrication process and its surface condition. In this study, electrochemical behavior of the electro-plated Pt electrode was compared with that of the sputtered Pt electrode, using cyclic-voltammetry and impedance spectroscopy (PARSTATE 2273, by AMETEK). Surface morphology of Pt electrode was investigated by AFM (XE-100, by PSIA). As a result, it was considered that electrochemical properties of sputtered Pt electrode is superior to that of electro-plated Pt electrode.

  • PDF

Surface Renewable Hydrogen Ion-Selective Polymeric Composite Electrode Containing Iridium Oxide

  • Quan, Hongmei;Kim, Won;Chung, Koo-Chun;Park, Jong-Man
    • Bulletin of the Korean Chemical Society
    • /
    • v.26 no.10
    • /
    • pp.1565-1568
    • /
    • 2005
  • A surface renewable pH electrode was prepared by utilizing composite electrode technique. Iridium oxide micro-fine particles was prepared by hydrolysis of $(NH_4)_2IrCl_6$ at elevated temperature. The iridium oxide particles were mixed with well-dispersed carbon black and then filtered. The mixture was suspended in DMF containing PVC as a binder. The mixture was precipitated rapidly by adding large amount of water. The precipitate was ground and pressure-molded to iridium oxide composite electrode material. The electrode showed linear response between pH 1-13 with 50 to 60 mV/pH slope. The electrode maintained the pH response without appreciable slope drift for 170 days if stored in deionized water. The electrode surface can be renewed reproducibly by simple grinding process whenever contaminated or deactivated.

Comparison between Two 450 mm Multi-Electrode Models

  • Park, Gi-Jeong;Lee, Yun-Seong;Yu, Dae-Ho;Lee, Jin-Won;Jang, Hong-Yeong
    • Proceedings of the Korean Vacuum Society Conference
    • /
    • /
    • pp.490-490
    • /
    • 2013
  • In semiconductor industry, it is expected that plasma process which use 450 mm source will be used at next generation. However, main obstacle of the large area plasma source is plasma uniformity from it. When electrode is enlarged, field difference between center area and side area reduces the plasma uniformity [1-3]. Therefore we investigate multi-electrode which diminish this field difference.We designed two multi-electrode models. One has two segments and the other has five segments. Each multi-electrode model is connected with two power generator and two matchers. One generator and one matcher is connected with center electrode part. The other one generator and the other one matcher is connected with side electrode part. The ion density is measured at 29 points by using floating harmonic method [4-6]. After measuring the data of each multi-electrode model, we discuss the difference of profile between two models' data.

  • PDF

The Characterization of Electrolytic Ion Water Generator by Electrode (전극에 따른 전해 이온수 발생장치의 특성)

  • Han, Byung-Jo;Lee, Yeon;Ryu, Bong-Jo;Koo, Kyung-Wan
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.65 no.10
    • /
    • pp.1786-1791
    • /
    • 2016
  • The damage has occurred inside the semiconductor pattern When using conventional wet station for semiconductor. It was used for electrolytic ion water generator in order to prevent damage to the semiconductor pattern. It was designed and developed a flow path electrode and the mesh electrode to check the efficiency of the electrode. And It confirmed the expected results through the simulation of the flow path. and ORP were measured in accordance with the current and voltage of mesh electrode and flow paht electrodes. Flow path electrode 22A is 3V, up to pH 9.8, the value of ORP-558mV was measured and the mesh electrode was measured up to pH 9.8, ORP -350mV.

Effect of Nickel addition in DC arc test of Cu-W electrode (Cu-W 전극의 DC Arc 시험에 있어서 Nickel 첨가 영향)

  • Kim, Bong-Seo;Chung, Hyeon-Wook;Lee, Hee-Woong
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • /
    • pp.11-14
    • /
    • 2003
  • Sintered Cu-W has been used for the electrode of GIS for interrupting the abnormal current. In this study the effect of Ni addition in Cu-W electrode was investigated. Cu-W electrodes used contains 0.1~0.2wt% Ni and were conducted the experiments which was attacked by DC arc test (70V-70A) for 300 times periodically. As the contents of Ni in Cu-W electrode increase, the hardness and electrical conductivity were decreased. The weight change ($\Delta$mg) of electrode after DC arc test increased with increasing Ni contents and test times. The hardness and electrical conductivity of electrode after DC arc test were decreased compared with non-arc affected electrode, which was owing to the defects near surface of electrode and degradation by arc heat. It was considered that Cu in the Cu-W electrode was scattered to all directions by arc heat, therefore, the electrodes were damaged and deformed in the surface and cross-section of electrode. It is difficult to estimate directly the characteristics of Cu-W electrode for GIS related with high voltage and current from the results of DC arc test conducted in this study. However, the results of the effect of Ni addition in Cu-W electrode could be applied for the research of electrode for GIS.

  • PDF

Electrochemical Properties of Carbon Nano-tube as the Counter Electrode of Dye-sensitized solar cell (염료감응형 태양전지의 상대전극 재료로서 탄소나노튜브의 전기화학적 특성)

  • Kim, Hyun-Ju;Lee, Dong-Yun;Koo, Bo-Kun;Lee, Won-Jae;Song, Jae-Sung;Lee, Dae-Yeol
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.17 no.10
    • /
    • pp.1090-1094
    • /
    • 2004
  • Studies on porous oxide electrode, dye and electrolyte for dye-sensitized solar cells have been intensively carried out until now. However, counter electrode have not been much studied so far. Accordingly, it is needed to investigate new counter electrode materials with superior catalyst property and to substitute for Pt electrode. In this case, carbon nano-tubes (CNTs) are one of alternatives for counter electrodes as following merits: low resistivity, excellent electron emission property, large surface area and low cost due to development of mass production technique. Such advantages gave us to select multiwalled CNTs (MWCNT) as counter electrode for dye-sensitized solar cell. Also, cyclic voltammetry and impedance spectroscopy were used to investigate electrochemical properties of both CNT electrode and Pt electrode. It was found that sheet resistance of CNT electrode was similar to that of Pt electrode, also, electrochemical properties of CNT electrode was superior to that of Pt electrode on the basis on the measurement of CV and impedance spectrum. It was found that CNT is likely to be a very promising electrode material for dye solar cells.

A Study on the Preparation of the Dimensionally Stable Anode(DSA) with High Generation Rate of Oxidants(II) (산화제 생성율이 높은 촉매성 산화물 전극(DSA)의 개발에 관한 연구(II))

  • Park, Young-Seek;Kim, Dong-Seog
    • Journal of Environmental Science International
    • /
    • v.18 no.1
    • /
    • pp.61-72
    • /
    • 2009
  • Fabrication and oxidants production of 3 or 4 components metal oxide electrode, which is known to be so effective to destruct non-biodegradable organics in wastewater, were studied. Five electrode materials (Ru as main component and Pt, Sn, Sb and Gd as minor components) were used for the 3 or 4 components electrode. The metal oxide electrode was prepared by coating the electrode material on the surface of the titanium mesh and then thermal oxidation at $500^{\circ}C$ for 1h. The removed RhB per 2 min and unit W of 3 components electrode was in the order: Ru:Sn:Sb=9:1:1 > Ru:Pt:Gd=5:5:1 > Ru:Sn=9:1 > Ru:Sn:Gd=9:1:1 > Ru:Sb:Gd=9:1:1. Although RhB decolorization of Ru:Sn:Sb:Gd electrode was the highest among the 4 components electrode, the RhB decolorization and oxidants formation of the Ru:Sn:Sb=9:1:1 electrode was higher than that of the 3 and 4 components electrode. Electrogenerated oxidants (free Cl and $ClO_2$) of chlorine type in 3 and 4 components electrode were higher than other oxidants such as $H_2O_2\;and\;O_3$. It was assumed that electrode with high RhB decolorization showed high oxidant generation and COD removal efficiency. OH radical which is electrogenerated by the direct electrolysis was not generated the entire 3 and 4 components electrode, therefore main mechanism of RhB degradation by metal oxide electrode based Ru was considered indirect electrolysis using electrogenerated oxidants.

Study of a Screen-Printed CNT Field Emitter with a Lateral-Gate Electrode (측면 게이트 전극을 이용한 스크린 프린트 되어진 탄소나노튜브 전계방출원의 연구)

  • Kim, Chang-Duk;Lee, Hyeong-Rag;Yang, Kiwon;Lee, Youngseok;Koo, Gyo Jun;Oh, Euidon;Song, Chang Yeon;Lee, Min Sub
    • New Physics: Sae Mulli
    • /
    • v.67 no.3
    • /
    • pp.352-356
    • /
    • 2017
  • A triode electrode field emitter having a lateral-gate electrode was fabricated, and its characteristics were confirmed. Generally, a gate electrode with a lateral-gate electrode structure is formed in proximity to the cathode electrode. The cathode and the gate electrodes were formed by using a one-step process with carbon nanotubes (CNTs). The field emission of the diode electrode structure was measured before that of the triode electrode structure was. The turn-on voltage of the diode electrode structure was 240 V. The turn-on voltage of the triode electrode structure was 40 V higher than that of the diode electrode structure. However, all field emitted currents of the triode electrode structure were confirmed to flow to the anode electrode.

A Study on Diagnosis of Partial Discharge Type Using Wavelet Transform-Neural Network (웨이블렛-신경망을 이용한 부분방전 종류와 진단에 관한연구)

  • Park, Jae-Jun;Jeon, Hyun-Gu;Jeon, Byung-Hoon;Kim, Sung-Hong;Kwon, Dong-Jin
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • /
    • pp.894-899
    • /
    • 2002
  • In this papers, we proposed the new method in order to diagnosis partial discharge type of transformers. For wavelet transform, Daubechies filter is used, we can obtain wavelet coefficients which is used to extract feature 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.

  • PDF

The Characteristics of Superposed Ozonizer using Three-Phase Voltage (3상전압을 이용한 중첩방전형 오존발생기의 특성)

  • Kim, Yeong-Hun;Chun, Byung-Joon;Song, Hyun-Jig;Youn, Young-Dae;Lee, Kwang-Sik
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.2259-2261
    • /
    • 1999
  • In this paper, an ozonizer, which can generate individual and superposed silent discharge, using three-phase voltage has been designed and manufactured. The ozonizer consists of 3 electrodes(Central Electrode, Internal Electrode and External Electrode) and 2 gaps(gap between Central Electrode and Internal Electrode, gap between Internal Electrode and External Electrode). Ozone is generated according to voltage supplying method to each electrode by individual silent discharge and three-phase superposed discharge. The characteristics of ozone generation were investigated with variation of discharge power and the quantity of supplied gas($O_2$). In case of individual silent discharge, the maximum values of ozone concentration, ozone generation and ozone yield were obtained between internal electrode and external electrode, and its values were 2300[ppm], 570[mg/h] and 745[g/kWh] respectively. Each maximum values was 5039[ppm], 1773[mg/h] and 851[g/kWh] respectively, when three-phase superposed silent discharge was employed. Therefore, characteristics of ozone generation with three-phase voltage are improved compared with single-phase voltage because silent discharge is generated continuously.

  • PDF