• Title, Summary, Keyword: Electrochemical property

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Study on Electrochemical Sensing Property of Harbor Pollutants using Viologen Derivative (Viologen 유도체를 이용한 항만오염물질의 전기화학적 센싱 특성 연구)

  • Park, Sang-Hyun;Lee, Dong-Yun;Kwon, Young-Soo
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.119-120
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    • 2008
  • In this paper, viologen derivative is used as charge transfer material to develop sensors for detecting the organic pollutants which are the main reason of harbor pollution. We fabricated self-assembled monolayers of viologen derivative on gold electrode of QCM and investigated an electrochemical behavior property. We also determined electrochemical sensing property about environmental pollution materials such as bezene, phosphate and surfactant through quantitative and qualitative analysis of charge transfer using intrinsic property of viologen derivative by temperature and concentration change. From the achieved results, we can apply and develope the detecting sensors for harbor pollutants.

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Evaluation of the Corrosion Protective Property in Steel applying Spray Metal by using High-frequency Arc Metal Spray Method (고주파 아크 금속용사공법을 이용한 용사금속의 방식성능 평가)

  • Choe, Hong-Bok;Lee, Han-Seung
    • Proceedings of the Korean Institute of Building Construction Conference
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    • pp.94-95
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    • 2014
  • The purpose of this study is to evaluate the corrosion protective property of Al-Mg high-freqeuncy arc metal spray method in comparison to Zn-Sn and Zn-Al alloys by electrochemical method and CASS test. As a result, it appeared that Al-Mg alloy had very higher corrosion protective property through the electrochemical characteristic and the CASS test comparing with the other alloys.

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Structural Effect of Conductive Carbons on the Adhesion and Electrochemical Behavior of LiNi0.4Mn0.4Co0.2O2 Cathode for Lithium Ion Batteries

  • Latifatu, Mohammed;Bon, Chris Yeajoon;Lee, Kwang Se;Hamenu, Louis;Kim, Yong Il;Lee, Yun Jung;Lee, Yong Min;Ko, Jang Myoun
    • Journal of Electrochemical Science and Technology
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    • v.9 no.4
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    • pp.330-338
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    • 2018
  • The adhesion strength as well as the electrochemical properties of $LiNi_{0.4}Mn_{0.4}Co_{0.2}O_2$ electrodes containing various conductive carbons (CC) such as fiber-like carbon, vapor-grown carbon fiber, carbon nanotubes, particle-like carbon, Super P, and Ketjen black is compared. The morphological properties is investigated using scanning electron microscope to reveal the interaction between the different CC and the active material. The surface and interfacial cutting analysis system is also used to measure the adhesion strength between the aluminum current collector and the composite film, and the adhesion strength between the active material and the CC of the electrodes. The results obtained from the measured adhesion strength points to the fact that the structure and the particle size of CC additives have tremendous influence on the binding property of the composite electrodes, and this in turn affects the electrochemical property of the configured electrodes.

Effect of Tantalum and Lanthanum Addition on Electrochemical Property of Austenitic Stainless Steel in a Simulated PEMFC Environment

  • Kim, Kwang-Min;Koh, Seong-Ung;Kim, Kyoo-Young
    • Corrosion Science and Technology
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    • v.7 no.6
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    • pp.338-343
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    • 2008
  • The electrochemical properties of W-modified austenitic stainless steels containing Ta and La were evaluated in a $H_{3}PO_{4}$ type PEMFC environment. Electrochemical test was conducted in 0.05 M $H_{3}PO_{4}$ solution at $80^{\circ}C$ and electrical property was conducted by contact resistance test. XPS was conducted to analyze the chemical elements consisting of passive film. Addition of La and Ta in W-modified austenitic stainless steel shows not only better corrosion resistance but also better electrical property.

Fabrication of Hemoglobin/Silver Nanoparticle Heterolayer for Electrochemical Signal-enhanced Bioelectronic Application

  • Lee, Taek;Yoon, Jinho;Choi, Jeong-Woo
    • Korean Chemical Engineering Research
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    • v.55 no.4
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    • pp.556-560
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    • 2017
  • A hemoglobin/silver nanoparticle heterolayer was fabricated for bioelectronic device with electrochemical signal-enhancement effect. As a device element, a hemoglobin, the metalloprotein, contained the heme group that showed the redox property was introduced for charge storage element. For electron transfer facilitation, a silver nanoparticle was introduced for electrochemical signal facilitation, the hemoglobin was immobilized onto Au substrate using chemical linker 6-mercaptohexanoic acid (6-MHA). Then, the silver nanoparticle was immobilized onto fabricated hemoglobin/6-MHA heterolayers by layer-by-layer (LbL) method. The surface morphology and surface roughness of fabricated heterolayer were investigated by atomic force microscopy (AFM). The redox property of hemoglobin/silver nanoparticle heterolayer was investigated by a cyclic voltammetry (CV) experiment for obtaining an oxidation potential and reduction potential. Moreover, for the assessing charge storage function, a chronoamperometry (CA) experiment was conducted to hemoglobin/silver nanoparticle-modified heterolayer electrode using oxidation and reduction potentials, respectively. Based on the results, the fabricated hemoglobin/silver nanoparticle heterolayer showed that an increased charge storage effect compared to hemoglobin monolayer-modified electrode.

Pore Structure and Electrochemical Properties of Carbon Aerogels as an EDLC-Electrode with Different Preparation Conditions (EDLC 전극용 카본에어로젤의 합성조건에 따른 기공구조 및 전기화학적 특성)

  • Seo, Hye Inn;Jung, Ji Chul;Kim, Myung-Soo
    • Korean Journal of Materials Research
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    • v.28 no.1
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    • pp.50-61
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    • 2018
  • Various carbon aerogels (CAs) were prepared from polymerization of resorcinol and formaldehyde and applied as the electrode materials of an electric double layer capacitor (EDLC) with the aim of controlling the textural and electrochemical properties of CAs by the type of base catalyst and the ratio of resorcinol to catalyst (R/C). The CAs from $NaHCO_3$ and $KHCO_3$ with $H^+$ ions had higher specific surface areas but exhibited lower electrochemical properties than those from $K_2CO_3$ and $Na_2CO_3$, which had more uniform pore size distributions. The electrochemical properties of $Na_2CO_3$ were superior to those of $K_2CO_3$ probably because the polarizing power of $Na^+$ ions was higher than $K^+$ ions. With an increasing R/C ratio, the pore sizes of CA showed a tendency to increase but the uniformity of the pore size distribution got worse. For the four base catalysts, the highest electrochemical property was obtained at the R/C ratio of 500.

Electrochemical Sensing Property of Harbor Pollutants using Viologen Derivative (Viologen 유도체를 이용한 항만오염물질의 전기화학적 특성)

  • Choi, Yong-Sung;Ji, Yoo-Kang;Park, Soo-Bong;Lee, Kyung-Sup
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.997-999
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    • 2008
  • In this paper, viologen derivative is used as charge transfer material to develop sensors for detecting the organic pollutants which are the main reason of harbor pollution. We fabricated self-assembled monolayers of viologen derivative on gold electrode of QCM and investigated an electrochemical behavior property. We also determined electrochemical sensing property about environmental pollution materials such as bezene, phosphate and surfactant through quantitative and qualitative analysis of charge transfer using intrinsic property of viologen derivative by temperature and concentration change. From the achieved results, we can apply and develope the detecting sensors for harbor pollutants.

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