• Title, Summary, Keyword: electrode potential

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The Effects of Electric Field Variation by The Third Electrode on Water Electrophysicochemical Characteristics (제3전극에 의한 전계변화가 수중 전기물리화학적 특성에 미치는 영향)

  • Kim, Jin-Gyu
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.24 no.9
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    • pp.136-141
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    • 2010
  • In this paper, after the third electrode type oxidant generator which could format non-uniform electric field in water had been manufactured and installed, by direct electrolysis, the effects of the hydrogen potential and oxidation reduction potential characteristics attendant upon electric field change on a higher concentration oxidant generation characteristics were investigated. Consequently, as the third electrode was installed in the middle of two slit electrodes and the polarity of applied power was changed, it was observed that the third electrode system with the positive electrode can generate a higher concentration oxidant, hydrogen potential and oxidation reduction potential as compared with that of the negative electrode. It is because the positive electrode was bombarded mostly energetic electrons and the negative electrode was bombarded mainly by less energetic positive ions.

Micro Electrochemical Machining Using a Multi-Function Electrode (복합기능 전극을 이용한 미세 전해가공)

  • Shin, Hong-Shik;Kim, Bo-Hyun;Kim, Gyu-Man;Chung, Do-Kwan;Chu, Chong-Nam
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.33 no.5
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    • pp.496-501
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    • 2009
  • In micro electrochemical machining(micro-ECM), it is important to measure and control the potential of a tool electrode and a workpiece electrode because electrochemical reaction rate depends on the potential of the electrodes. When the electrode potential was measured against a reference electrode, the error of measured electrode potential could be minimized by proper tool electrode design. In this paper, multi-function electrodes consisting of a tool electrode and a reference electrode was fabricated by micro fabrication techniques. The machining conditions in micro-ECM using multi-function electrodes, such as pulse voltage parameters and electrode potential, were investigated.

The Usability of Zinc Electrode using Wireless Measuring System of Electric Potential (무선전위측정시스템에 사용하는 아연전극 활용성 검토)

  • Lee, Jong-Rark;Leem, Sa-Hawn;Kim, Sang-O
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • pp.177-180
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    • 2006
  • This study is to make a basic study if solid zinc (Zn) can be used for buried reference electrode, so we examined the adequacy of zinc as reference electrode by using zinc which showed regular electrode for buried period. The deference of electric potential if zinc electrode for corrosion factor such as soil resistivity or pH didn't show fixed trend and there was no clear trend on the change of measurement period. From field test, it is known that the natural electric potential difference of CSE electrode and zinc electrode is 1,100mV, but the electric potential of zinc electrode for CSE electrode in the natural soil and copying soil was 1,094~1,158mV. There was no fixed trend on the change of measurement period and electric potential difference of zinc electrode for corrosion factors such as soil resistivity or pH. Consequently, there was 40~60mV of electric potential difference in every copying soil during the experiment measurement.

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Potential Interference between the Earth Electrode (접지극의 전위간섭)

  • Kim, Ju-Chan;Kim, Sung-Sam;Koh, Hee-Seog
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • pp.48-52
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    • 2004
  • Recently, there are many electricity, electronics, and communication equipment which need to earthing in the building. When electric current flows into a certain earthing system in the same building, the potential of other earthing system rises. This potential interference repuire surface potential of electrodes by electrode shape. 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 receive the potential interference. The degree of potential interference as multiple earth electrode is verified the simulated results by means of the simple model in advance.

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The Problems in the Measurement of DC Potential on Meridian Skin Area (경락노선상 직류 전위 측정에서의 문제점)

  • Heo, Ik-Beom;Lee, Woo-Cheol;Lee, Yoo-Jeong;Yin, Chang-Shik
    • The Journal of the Korean Medicine Diagnostics
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    • v.9 no.1
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    • pp.131-135
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    • 2005
  • Background and purpose: The measurement of direct current (DC) potential on skin area of meridian has recently been adopted to explore the electrophysiological characteristics of meridian system, But there exists two problems to be explained; the entity of the DC potential to be measured and the characteristics of electrode gel interface of measurement system, It is not clear whether the DC potential reflect, at least hypothetically, the entity of meridian, and if there exist any unstable factor in the DC potential measurement system. Methods: In this study, we designed an electronic circuit model of skin and applied known DC potential sources $({\pm}10.75mV,\;0mV)$ to the electrode interface of the skin model. Results: The result showed that the measured DC potential changed according to the time, and the same phenomenon was observed when the electrode gel was replaced with an electric condenser. It is suggested that the measurement of DC potential on electrode gel interface is very difficult and produces unstable values due to the capacity effect of electrode gel. Conclusion: Further studies on the DC potential evaluation in the context of meridian study should consider and bypass this problem.

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The Study on the Electric Potential Variation of Needle Electrodes by Charged Insulating Oil in the Charge Reducer (대전된 절연유에 의한 제전관내 침전극의 전위변화에 관한 연구)

  • Kim, Y.I.;Kim, Y.B.;Kim, D.S.;Park, J.Y.;Cho, Y.K.;Lee, D.C.
    • Proceedings of the KIEE Conference
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    • pp.1583-1585
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    • 1994
  • In this paper, we investigated the relationship between the needle electrode current and the needle electrode potential, The needle electrode potentials have influence on the needle electrode currents absolutely. So, to increase the needle electrode currents there is necessary to keep a high electric field if the charge reducer. for this, high insulation materials must be selected, and charge density of insulating oil must be high. In this experiment, the more a charge density of insulating oil increases, the more a needle electrode potential increases. So we could know what increasement of needle electrode potential increases a needle electrode current.

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Determination of Electrode Potential in Micro Electrochemical Machining of Passive Metals (부동화 금속의 미세 전해 가공 시 전극 전위의 선정)

  • Nam Ho-Sung;Kim Bo-Hyun;Chu Chong-Nam;Park Byung-Jin
    • Journal of the Korean Society for Precision Engineering
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    • v.23 no.4
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    • pp.146-152
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    • 2006
  • In micro electrochemical machining (ECM), electrodes should be prevented from unfavorable oxide and Passive layer formation on the machined surface or overall corrosion of the entire surface. Generally, metal electrodes corrode, passivate or dissolve in the electrochemical cell according to the electrode potential. Therefore, each electrode must maintain its stable potential. Tn this paper, the stable electrode potentials of tool and workpiece were determined using the potentiodynamic polarization test and verified experimentally considering machining stability and surface quality. Stable workpiece electrode potentials of two different passive materials of 304 stainless steel and nickel were determined in the 0.1 M sulfuric acid. Experimental results show good machined surface and fast machining rate using the determined electrode potentials.

In-line Monitoring of an Oxide Ion in LiCI Molten Salt Using a YSZ Based Oxide Ion Selective Electrode

  • Cho, Young-Hwan;Jeon, Jong-Seon;Yeon, Jei-Won;Choi, In-Kyu;Kim, Won-Ho
    • Nuclear Engineering and Technology
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    • v.36 no.5
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    • pp.415-419
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    • 2004
  • The electrode potential characteristics of a YSZ based membrane metal oxide electrode have been studied in molten LiCL at $700^{\circ}C$ by the potentiometric method. The electrode exhibited a good potential response to log[$O^2$] and data reproducibility. The calibration plot (potential vs. log[$O^2$] was found to be linear, obeying the Nernst equation. The electrode potential showed a good reversibility corresponding to increase/decrease of the oxide ion present in the molten LiCl. The physical and chemical durability appeared to be sound after several repeated uses, resulting in reproducible results. However, "the proposed electrode" failed when metallic Li was present in the melt.

Reference Electrode at Molten Salt: A Comparative Analysis of Electroceramic Membranes

  • Yoon, Seokjoo;Kang, Dokyu;Sohn, Sungjune;Park, Jaeyeong;Lee, Minho;Choi, Sungyeol
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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    • v.18 no.2
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    • pp.143-155
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    • 2020
  • A reference electrode is important for controlling electrochemical reactions. Evaluating properties such as the reduction potential of the elements is necessary to optimize the electrochemical processes in pyroprocessing, especially in a multicomponent environment. In molten chloride systems, which are widely used in pyroprocessing, a reference electrode is made by enclosing the silver wire and molten salt solution containing silver chloride into the membranes. However, owing to the high temperature of the molten salt, the choice of the membrane for the reference electrode is limited. In this study, three types of electroceramic, mullite, Pyrex, and quartz, were compared as reference electrode membranes. They are widely used in molten salt electrochemical processes. The potential measurements between the two reference electrode systems showed that the mullite membrane has potential deviations of approximately 50 mV or less at temperatures higher than 650℃, Pyrex at temperatures lower than 500℃, and quartz at temperatures higher than 800℃. Cyclic voltammograms with different membranes showed a significant potential shift when different membranes were utilized. This research demonstrated the uncertainties of potential measurement by a single membrane and the potential shift that occurs because of the use of different membranes.

Potential Interference of Plural Grounding Electrodes (복수접지극의 전위간섭)

  • Kim Ju Chan;Choi Jong Kyu;Lee Chung Sik;Koh Hee Seog
    • Proceedings of the KIEE Conference
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    • pp.27-29
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    • 2004
  • Recently, there are many electricity, electronics, and communication equipment which need to earthing in the building. When electric current flows into a certain earthing system in the same building, the potential of other earthing system rises. This potential interference require surface potential of electrods by electrode shape. 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 receive the potential interference. The degree of potential interference as multiple earth electrode is verified the simulated results by means of the simple model in advance.

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