• Title, Summary, Keyword: electrode material

Search Result 2,275, Processing Time 0.108 seconds

A New Measurement Method of Dielectric Constants Applied the Principles of Cross Capacitance (Cross Capacitance 원리를 작용한 새로운 유전상수 측정방법 제안)

  • Kim, Han-Jun;Lee, Rae-Duk;Kang, Jeon-Hong;Yu, Kwang-Min;Han, Sang-Ok
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • /
    • pp.1084-1087
    • /
    • 2002
  • The guard-ring type 3-terminal parallel plate electrodes proposed by ASTM D 150-81 and IEC 250 have been widely used for measurement of dielectric constants of solid dielectrics. However the method using this electrodes causes many uncertainty associated with the measurement errors of the diameter of the guarded electrode. the gap between guarded and guard-ring electrode. the distance of two active electrodes(the thickness of specimen), the roughness and contamination of surface of electrode and specimen. close adherence grade of electrode and specimen. In this paper. a new electrode system of cross capacitance type based on Thompson-Lampard theorem is designed and is employed for the measurement of dielectric constant. The results of simulation of guard-ring electrode and cross capacitance electrode using FEM program show that distance measurement between two electrodes in guard-ring electrode produces large uncertainty. on the other hand this effect in cross capacitance electrode is negligible. Furthermore. the air gap effects in the cross capacitance electrode is 5.6 times less sensitive than that in guard-ring electrode by assuming air gap of $50{\mu}m$.

  • PDF

A Study on Signal Feature Extraction of Partial Discharge Types Using Discrete Wavelet Transform Technique (이산웨이블렛 변환기법을 이용한 부분방전종류의 신호특징추출에 관한연구)

  • Park, Jae-Jun;Jeon, Byung-Hoon;Kim, Jin-Seong;Jeon, Hyun-Gu;Baek, Kwan-Hyun
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • /
    • pp.170-176
    • /
    • 2002
  • In this papers, we proposed the feature extraction method due to partial discharge type of transformers. For wavelet transform, Daubechie's 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 acoustic emission signal generated from each partial discharge type. The defects which could occur in a transformer were simulated by using needle-plane electrode, IEC electrode and Void electrode. Also, these coefficients are used to identify signal of partial discharge type electrode fault in transformer. As a result, from compare of acoustic emission amplitude and acoustic 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 Needle-Plane electrode electrode> Void electrode> IEC electrode.

  • PDF

Electrochemical Properties of Conducting Polymer for Supercapacitor (Supercapacitor용 도전성 고분자의 전기화학적 특성)

  • 강광우;김종욱;구할본
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • /
    • pp.332-334
    • /
    • 2000
  • The purpose of this study is to research and develop conducting polymer(CP) composite electrode for supercapacitor. Supercapacitor cell of CP composite electrode with 1M LiClO$_4$/ PC bring out good capacitor performance below 4V. The radius of semicircle of CP composite cell with PAn composite electrode adding 30wt% acetylene black was absolutely small. The total resistance of supercapacitor cell mainly depended on internal resistance of the electrode. The discharge capacitance of supercapacitor cell with PAn composite electrode adding 30wt% acetylene black in 1st and 50th cycles was 27F/g and 31F/g at current density of 1mA/$\textrm{cm}^2$. Supercapacitor cell with PAn composite electrode adding 30wt% acetylene black performed a good cycliability.

  • PDF

Electrical Propeties of Supercapacitor using Polyaniline and Polythiophene (Polyaniline과 Polythiophene을 사용한 Supercapacitor의 전기적 특성)

  • 강광우;김명산;김종욱;구할본
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.13 no.9
    • /
    • pp.764-769
    • /
    • 2000
  • The purpose of this study is to research and develop conducting polymer(CP) composite electrode for supercapacitor. Supercapactior cell of CP composite electrode with 1M LiClO$_4$/PC brings out good capacitor performance below 4V. The radius of semicircle of CP composite cell with PAn composite electrode adding 15Wt% SP270(PAnS15) and PT composite electrode adding 50%wt% SP270(PTS50) was absolutely small. The total resistance of supercapacitor cell mainly depended on internal resistance of the electrode. The discharge capacitance of supercapacitor cell with PTS50(+)/PAnS15(-) in 1st and 20th cycles was 38F/g and 28F/g at current density of 1mA/$\textrm{cm}^2$, respectively.

  • PDF

Selective electrochemical detection effect of serotonin in blood by using boron doped diamond rotating disk electrode (Boron doped diamond RDE에 의한 혈액내의 serotonin의 전기화학적 선택적 검출 효과)

  • Hwang, Jin-Hee;Cho, Eun-In;Park, Soo-Gil;Okajima, Takeyoshi;Ohsaka, Takeo;Fujishima, Akira
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • /
    • pp.930-933
    • /
    • 2003
  • The electrochemical oxidation of ascorbic acid(AA), serotonin(StT) and epinephrine(EP) have been performed ae poly N,N-dimethylanliline(PDMA) film coated diamond electrode. This cationic polymer film is electrochemically deposited on boron-doped diamond electrode surface. Unlike the bard electrode, the polyaer film-coated diamond electrode can well separate the oxidation potential of AA by 330mV. Thus this electrode can be successfully used for the simultaneoud detection of both species. Increases in the concentration of AA donot affect the reponse of EP and ST.

  • PDF

Electrical Properties of Supercapacitor with Polyaniline and Polythiophene (Polyaniline과 Polythiophene을 사용한 supercapaccitor의 전기적 특성)

  • 강광우;김종욱;구할본
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • /
    • pp.487-490
    • /
    • 2000
  • The purpose of this study is to research and develop conducting polymer(CP) composite electrode for supercapacitor. Electrochemical capacitor(supercapacitor) cell of CP composite electrode with 1M LiClO$_4$PC bring out good capacitor performance below 4V. The radius of semicircle of CP composite cell with PAn composite electrode adding l5wt%SP270(PAnS15) and PT composite electrode adding 50wt%SP270 (PTS50) was absolutely small. The total resistance of supercapacitor cell mainly depended on internal resistance of the electrode. The discharge capacitance of supercapacitor cell with PTS50(+)/PAnS15(-) in 1st and 20th cycles was 38F/g and 28F/g at current density of 1mA/cm$^2$. Supercapacitor cell with PTS50(+)/PAnS15(-) showed good capacitance and stability with cycling.

  • PDF

Electrochemical detection effect of hormone in body by using polymer coated boron doped diamond electrode (고분자 막이 코팅된 Boron doped diamond 전극에 의한 호르몬의 전기화학적 검출 효과)

  • Hwang, Jin-Hee;Cho, Eun-In;Park, Soo-Gil;Okajima, Takeyoshi;Ohsaka, Takeo;Fujishima, Akira
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • /
    • pp.611-614
    • /
    • 2003
  • The electrochemical oxidation of ascorbic acid(AA), serotonin(SE) and epinephrine(EP) have been performed at poly N,N-dimethylaniline(PDMA) film coated diamond electrode. This cationic polymer film is electrochemically deposited on boron-doped diamond electrode surface. Unlike the bard electrode, the polymer film-coated diamond electrode can well separate the oxidation potential of AA by 200mV. Thus this electrode can be successfully used for the simultaneoud detection of both species. Increases in the concentration of AA do not affect the reponse of EP and SE.

  • PDF

Oxygen sensor for the low temperature-measurement using yttria stabilized zirconia(YSZ) electrolyte and Ag electrode (YSZ 전해질과 은 전극을 이용한 저온 산소센서에 대한 연구)

  • Yang, Young-Chang;Park, Chong-Ook
    • Journal of Sensor Science and Technology
    • /
    • v.15 no.2
    • /
    • pp.97-101
    • /
    • 2006
  • Silver electrode having a high Electrocatalytic activity is oxygen-permeable electrode, in which oxygen ad-atoms are adsorbed and moved toward YSZ electrolyte by bulk diffusion. It is the different point in comparison to usual porous electrodes, especially platinum, which react with oxygen only in TPBs(Three Phase Boundaries). Also ad-atoms at TPBs of Pt are diffused to YSZ electrolyte by interfacial diffusion mechanism. These properties were used for turning down the operating temperature of YSZ from over $600^{\circ}C$ to below $450^{\circ}C$. The different heat-treatment temperature between a working electrode and a reference electrode suppresses the formation of silver oxides and reduces a volatility of Ag as well. Above all, these own characteristics and special processes of Ag improved a long-term stability of a oxygen sensor.

DSSCs Efficiencies of Photo Electrode Thickness and Modified Photo Electrode Surface Area (광전극 두께와 표면적 변형에 따른 DSSC의 효율 특성)

  • Kwon, Sung-Yeol;Yang, Wook;Zhou, Ze-Yuan
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.27 no.2
    • /
    • pp.115-120
    • /
    • 2014
  • Photo electrode is an important component for DSSC. DSSCs electrical characteristics and efficiencies fabricated with different $TiO_2$ photo electrodes thickness and modified phoro electrode surface area were studied. $11{\mu}m$ $TiO_2$ photo electrode shows a 4.956% efficiency. The highest short circuit current density was a $9.949mA/cm^2$. Efficiencies and short circuit current density increased as tape casting thickness decreased. Modified surface area of the photo electrode by needle stamp processing were studied. 200 times needle stamp processing on photo electrodes shows a highest 5.168% efficiency. Also the short circuit current density was a $10.261mA/cm^2$.

The Partial Discharge Characteristics of the XLPE According to the Tilt of the Needle Electrode (침 전극 기울기에 따른 XLPE의 부분 방전 특성)

  • Shin, Jong-Yeol;Ahn, Byung-Chul;Hong, Jin-Woong
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.28 no.1
    • /
    • pp.28-33
    • /
    • 2015
  • The needle electrode is inserted into the cross-linked polyethylene(XLPE) which is the ultra high voltage cable for electric power. By changing the tilt of the needle electrode, we investigated how the void and the thickness of the insulating layer influence the partial discharge(PD) characteristics and the insulating breakdown. In order to investigate the PD characteristics, The XLPE cable was used to the specimens and the tungsten electrode was used with the needle electrode. And the inner semi-conductive layer material of XLPE cable was used with the negative electrode by bonding with the use of conduction tape. The size of the specimens was manufactured to be $16{\times}40{\times}30[mm^3]$. We confirmed the effect on changing the PD characteristics according to the changing voltage and the tilt of the electrode after applying the voltage on the electrode from 1[kV] to 40[kV] at room temperature. In the PD characteristics, it was confirmed that the PD current of air void specimens with tilt was unstable more than that of no void specimens with tilt. It was also confirmed that the breakdown voltage was decreased because the effect of air void is more active than the change of the needle electrode tilt in the specimen with air void inside the insulation.