• Title/Summary/Keyword: Electrode treatment

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Effect of the redox flow battery and electrode characteristics according to the heat treatment temperature of a carbon felt (탄소펠트의 열처리 온도에 따른 레독스흐름전지와 전극 특성에 미치는 영향)

  • Yoo, Hyosung;You, Hyunjin;Yu, Kihyun;Kang, Junyoung;Park, Hongsik;Choi, Woonghwi;Yoo, Dong Jin
    • Journal of Energy Engineering
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    • v.24 no.3
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    • pp.89-95
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    • 2015
  • Carbon felts manufactured by (Co)CNF were subjected to heat treatment under different temperatures to use for the electrode of a redox-flow battery. BET and weight loss were tested to investigate the physical properties of the carbon felt according to the heat treatment conditions. SEM and XPS were also analyzed to characterize their surface area. In addition, electrical resistance, CV (cyclic voltammetry) and RFB charge on the electrode properties were examined in accordance with the heat treatment conditions with the discharge performance. The changes of physical properties on the carbon felt surface was confirmed via SEM and BET analysis, The most addition of oxygen functional groups on the carbon felt surface was obtained when one hour heat treatment at $550^{\circ}C$ and it was confirmed by XPS analysis. After resulting the CV tests, the active area of the electrode was the largest at $550^{\circ}C$ heat treatment. The heat treatment experiment of vanadium redox flow battery using the carbon felts were tested at $400^{\circ}C$, $500^{\circ}C$ and $550^{\circ}C$. As a result, the charge-discharge energy efficiency of the heat treatment electrode was 72.9% and 79.8%, at $400^{\circ}C$ and $500^{\circ}C$, respectively. The efficiency of the heat treatment electrode at $550^{\circ}C$ was the best as 79.8% at $550^{\circ}C$.

The Effects of Solution Heat Treatment and Aging Treatment on the Electrical Conductivity and Hardness of Cu-Cr Alloys (크롬동합금의 도전율과 경도에 미치는 용체화처리와 시효처리의 영향)

  • Kim, Shin Woo
    • Journal of the Korean Society for Heat Treatment
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    • v.15 no.1
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    • pp.21-24
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    • 2002
  • The electrode materials for welding machine in automobile industry such as Cu-Cr, Cu-Zr and Cu-$Al_2O_3$ require the high electrical conductivity and the proper hardness. Therefore the effects of solution heat treatment and aging treatment on the electrical conductivity and hardness of Cu-0.8wt%Cr and Cu-1.2wt%Cr alloys have been investigated. Cu-0.8wt%Cr alloy showed the higher electrical conductivity and hardness than Cu-1.2wt%Cr alloy and both alloys showed the better electrical conductivity at $930^{\circ}C$ among 930, 980 and $1030^{\circ}C$ solution heat treatment temperatures. The electrical conductivity and hardness in both alloys were not affected by aging treatment but remarkably affected by solution heat treatment temperature. The final drawing process reduced electrical conductivity and increased hardness more in Cu-1.2wt%Cr alloy.

Characteristics of Eleclrolytic Treatment of Dye Wastewater (염색폐수의 전해처리 특성)

  • 전법주;윤용수
    • Journal of environmental and Sanitary engineering
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    • v.11 no.3
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    • pp.37-46
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    • 1996
  • In this study, the effect of pH, Temp, dye concentration, distance of electrode, and the potential on the removal efficiency of dye-wastewater using electrochemical reaction were investigated. Optimum conditions for the electrochemical treatment of dye-wastewater were obtained that pH;7, 8V, electrode distance; 1cm and the reaction time for obtaining above 99% removal efficiency were 10 - 40min at each conditions, From this result, we can determine the instantaneous current efficiency and specific energy consumption, and we can provide the effective data for economical treatment of industrial dye-wastewater.

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Cu Electrode Fabrication by Acid-assisted Laser Processing of Cu Nanoparticles and Application with Transparent·Flexible Electrode (구리 나노 입자에 산-보조 레이저 공정을 적용한 구리 전극 제작 공정 개발 및 투명·유연 전극으로 활용)

  • Jo, Hyeon-Min;Gwon, Jin-Hyeong;Ha, In-Ho;Go, Seung-Hwan
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2018.06a
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    • pp.121-121
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    • 2018
  • Copper is a promising electronic material due to low cost and high electrical conductivity. However, the oxidation problem in an ambient condition makes a crucial issue in practical applications. In here, we developed a simple and cost-effective Cu patterning method on a flexible PET film by combining a solution processable Cu nanoparticle patterning and a low temperature post-processing using acetic acid treatment, laser sintering process and acid-assisted laser sintering process. Acid-assisted laser sintering processed Cu electrode showed superior characteristics in electrical, mechanical and chemical stability over other post-processing methods. Finally, the Cu electrode was applied to the flexible electronics applications such as flexible and transparent heaters and touch screen panels.

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Study of Electrochemical Cs Uptake Into a Nickel Hexacyanoferrate/Graphene Oxide Composite Film

  • Choi, Dongchul;Cho, Youngjin;Bae, Sang-Eun;Park, Tae-Hong
    • Journal of Electrochemical Science and Technology
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    • v.10 no.2
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    • pp.123-130
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    • 2019
  • We investigated the electrochemical behavior of an electrode coated with a nickel hexacyanoferrate/graphene oxide (NiPB/GO) composite to evaluate its potential use for the electrochemical separation of radioactive Cs as a promising approach for reducing secondary Cs waste after decontamination. The NiPB/GO-modified electrode showed electrochemically switched ion exchange capability with excellent selectivity for Cs over other alkali metals. Furthermore, the repetitive ion insertion and desertion test for assessing the electrode stability showed that the electrochemical ion exchange capacity of the NiPB/GO-modified electrode increased further with potential cycling in 1 M of $NaNO_3$. In particular, this electrochemical treatment enhanced Cs uptake by nearly two times compared to that of NiPB/GO and still retained the ion selectivity of NiPB, suggesting that the electrochemically treated NiPB/GO composite shows promise for nuclear wastewater treatment.

Research on the Development of High Radio-Frequency Electrode Probe for Under-Water Treatment (수중 치료용 고주파 전극 프로브 개발에 관한 연구)

  • Tea-Ho Yoon;Woo-Cheol Lee
    • The Journal of the Korea institute of electronic communication sciences
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    • v.18 no.6
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    • pp.1337-1344
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    • 2023
  • We aim to find out the effectiveness of performance evaluation to ensure safety of performance through development of high-frequency electrode probes, evaluation test protocol and evaluation simulator that is essential to ensure safety in performance evaluation and reliability evaluation of high-frequency electrode probes for underwater therapy used with high-frequency electrosurgical equipment.

A Study on the Deposition Characteristics of ZnO Piezoelectric Thin film Bulk Acoustic Resonator (FBAR 응용을 위한 ZnO 압전 박막의 증착 특성에 관한 연구)

  • 최승혁;김종성
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.16 no.8
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    • pp.716-722
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    • 2003
  • ZnO thin films were deposited on Al and Pt electrodes by an RF reactive sputtering system for the fabrication of FBAR (film bulk acoustic wave resonator), and the effect of thermal treatment temperature on their c-axis preferred orientation was investigated. SEM experiments show that columnar structure of ZnO thin films were grown with c-axis normal to electrode material, and XRD experiments show that both ZnO films were grown with (002) plane preferred orientation, but larger diffraction peak was observed with Pt electrode. The peak intensity increased with higher thermal treatment temperature, but c-axis preferred orientation was diminished. The surface roughness of Al thin film was higher than that of Pt, and these affect the surface roughness of ZnO film deposited on the electrode. Though the preferred orientation with respect to Pt(111) plane was improved with higher thermal treatment temperature, this could not improve the c-axis orientation of ZnO film.

Treatment of Wastewater containing Cu and Ni by Electrolysis (전기분해를 이용한 동과 니켈함유 폐수처리)

  • 김재용;이상희
    • Journal of environmental and Sanitary engineering
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    • v.16 no.2
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    • pp.47-55
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    • 2001
  • We investigated to find the optimum operation condition of electrolysis which have an influence on removal efficiency of heavy metals. When we experimented the testing wastewaters containing each 250mg/L of Cu and Ni ions, we got the variables like as pH, amount of electrolyte(NaCl), different species of electrode, electrode gap, electric strength, the number of electrodes, after fastening positive electrode plate with Al, Fe, Ti and negative electrode plate with Stainless Steel plate.

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Development of Highly Efficient Dye-Sensitized Solar Cells Using ZnO Post-Treated TiO2 Photoelectrodes (ZnO로 후처리된 TiO2 광전극을 이용한 고효율의 염료감응형 태양전지의 개발)

  • PARK, JUN-YONG;YUN, BYEONG-RO;KIM, TAE-OH
    • Journal of Hydrogen and New Energy
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    • v.28 no.4
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    • pp.419-425
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    • 2017
  • In this study, an efficient dye-sensitive solar cells (DSSC) was developed after post-treatment of ZnO on $TiO_2$ photoelectrode. The $TiO_2$ electrode with ZnO post treatment was prepared with Titanium isoporopoxide in Zinc Nitrate Hexahydrate aqueous solution by incineration for 30 min at $450^{\circ}C$. The ZnO-post treated $TiO_2$ electrode showed strong dispersion force between particles in relation to the control $TiO_2$, referring high specific surface area and dye-adsorption rate. Proper addition of ZnO enhanced electron mobility and reduced internal resistance and electron recombination. Light conversion efficiency of DSSCs containing the ZnO-posttreated $TiO_2$ electrode increased 35.4% when compared to the DSSCs using $TiO_2$ electrode. It is similar to the DSSCs with $TiCl_4$ post treatment $TiO_2$ electrode. Increasing of light conversion efficiency was due to high specific surface area and dispersion force, and low dye-adsorption rate and electron recombination. Taken together, ZnO may be used as posttreatment of photoelectrode and replaced $TiCl_4$ that has high toxicity and causticity.

Enhanced Sensitivity of PEDOT Microtubule Electrode to Hydrogen Peroxide by Treatment with Gold (금 처리를 통한 PEDOT 마이크로튜브 전극의 과산화수소 검출 특성 향상)

  • Park, Jongseo;Son, Yongkeun
    • Polymer(Korea)
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    • v.38 no.6
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    • pp.809-814
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    • 2014
  • An array structure of conducting polymer microtubule was fabricated for an amperometric biosensor. 3,4-Ethylenedioxythiophene (EDOT) was electropolymerized in the microporous template membrane with poly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonic acid) (PEDOT/PSS) composite as a binder. The array structure can provide enhanced current collecting capability due to large active surface area compared to the macroscopic area of the electrode itself. For a biosensor application, the array electrode was tested for $H_2O_2$ detection and showed very sluggish electrochemical response to $H_2O_2$. To enhance the detection efficiency to the oxidation of $H_2O_2$, gold was treated on the electrode by two different approaches: sputtering and electrochemical deposition. Gold treatment with either method greatly enhanced the sensitivity of the electrode to $H_2O_2$. So, conducting polymer microtubule array with gold treatment was expected to be a sensitive amperometric biosensor system based on the detection of $H_2O_2$.