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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Electrochemical Society
Journal Basic Information
Journal DOI :
The Korean Electrochemical Society
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Volume & Issues
Volume 2, Issue 4 - Nov 1999
Volume 2, Issue 3 - Aug 1999
Volume 2, Issue 2 - May 1999
Volume 2, Issue 1 - Feb 1999
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Measurement of the Corrosion Rate of Aluminum in Alkaline Solution
Shim Eun-Gi ; Hwang Young-Gi ; Chun Hai-Soo ;
Journal of the Korean Electrochemical Society, volume 2, issue 3, 1999, Pages 117~122
This study investigated the corrosion rate of aluminum in alkaline solution. It was performed to observe the effects of alloy element, alkalinity (KOH concentration), solution temperature, and inhibitor and its concentration in the solution. Among species of aluminum, AA-1050 showed the lowest corrosion rate due to its high purity $(>199\%)$, whereas alloys containing Mg anuor Mn were highly corroded, relatively. The corrosion rate could be reduced over than
by saturating the solution with ZnO, while ZnAc did not work as an inhibitor. The inhibition effect of ZnO increased with increasing the alkalinity and solution temperature. It was found that the corrosion rate linearly increased with the concentration of KOH in first order and exponentially decreased with the inverse of the solution temperature. An analysis of the corroded material covered the surface of aluminum was made by SEM and EDS. According to the analytical results by using XRD, it was confirmed that
was produced from the corrosion of aluminum in KOH solution.
Initial Charge/Discharge of
Composite Cathode with Various Content of Conductive Material for the Lithium ion Battery
Doh Chil-Hoon ; Moon Seong-In ; Yun Mun-Soo ; Yun Suong-Kyu ; Yum Duk-Hyung ; Park Chun-Jun ;
Journal of the Korean Electrochemical Society, volume 2, issue 3, 1999, Pages 123~129
Initial electrochemical characteristics of
electrode for lithium ion battery with various content of super s black as conductive material were evaluated through the charge/discharge with the potential range of 4.3V to 2.0V versus
. The rate of C/4 and C/2 by the 3 electrode test cell composed with an electrolytic solution of 1 mol/l
. Lithium was used as reference electrode. High impedance charge behavior was observed at early stage of charge. In the case of
of super s black as conductive material, the specific resistance of the high impedance releasing was
at the current density of
, which corresponds 7 times of the specific resistance of electrode
. At second charge, the specific resistance of the high impedance releasing was 63 mn · g-Lico02, which corresponds 12eio of the specific resistance of electrode and only
of that of the first charge. The first charge and discharge specific capacities at C/4 rate were 160-161 and
, respectively, to lead
of coulombic efficiencies and ca.
of initial irreversible specific capacity. Specific resistance at the end of charge and rest showed low value at content of super s black between 2 and
, which agreed with characteristics of irreversible specific capacity. Capacity densities were reduced by the increasing the content of conductive material. They were 447 and 431mAh/ml when 2 and
of super s black were used, respectively, at the rate of C/4.
Study on Porous Silicon Sensors to Measure Low Alcohol Concentration
Kim Seong-Jeen ;
Journal of the Korean Electrochemical Society, volume 2, issue 3, 1999, Pages 130~133
In this work, a capacitance-type alcohol gas sensor using porous silicon layer is developed to apply for breath alcohol measurement and its characteristics are estimated at room temperature. Current alcohol sensors using metal oxides such as tin-oxide are not only difficult to measure low alcohol concentration, but also should heat at
to improve the sensitivity. But the sensor using porous silicon layer has good sensitivity even at room temperature by very large effective surface area and suitable structure to fabricate integrated micro sensors. In the experiment, the capacitance was measured for the range of 0 to
alcohol concentration with the interval of
, in which alcohol solution was kept at 25, 36, and
by a heater. As the result, good linearity was observed and the capacitance increased about 1.1, 2.6 and
per the increment of
alcohol concentration each temperature, respectively, at the frequency of 120 Hz.
The Electrochemical Property Studies on Polyacenic Semiconductor Anode Material
Kim Han-Joo ; Park Jong-Eun ; Son Won-Keun ; Lee Hong-Ki ; Park Soo-Gil ; Lee Ju-Seong ;
Journal of the Korean Electrochemical Society, volume 2, issue 3, 1999, Pages 134~137
The polyacenic semiconductor material (PAS) electrode prepared by the pyrolytic treatment of phenol-formaldehyde resin is one of useful electrodes. As an anode material of lithium rechargeable batteries, amorphous carbon materials have been studied extensively because of their high electrochemcal performance and cyclicability. Carbon materials do not lead to the formation of lithium dendrite which is one of the most serious problems in applying Li-based materials to an electrode of batteries. The polyacene materials prepared from phenol resin at relatively low temperatures
show a highly Li\doped state up to
state without liberation of Li cluster. We prepared each polyacene materials at various temperature and investigated electro- chemical properties. We tried to change the mole ratio of [H]/[C] which is
range. Considering of electrochemical properties of PAS material, the PAS material is one of the most suitable materials for electrodes of a polymer battery.
The Study on Development of Plating Technique on Electroless Ni/Au
Park Soo-Gil ; Park Jong-Eun ; Jung Seung-Jun ; Yum Jae-Suk ; Jun Sae-ho ; Lee Ju-Seong ;
Journal of the Korean Electrochemical Society, volume 2, issue 3, 1999, Pages 138~143
Recently, miniaturization of large scale integrated circuits (LSI) and printed circuit board (PCB) have become essential with the downsizing of electronic devices. Gold electroplating is applied of conductivity wiring or terminals for improvement of conductivity and corrosion resistance. However, electroplating is not applicable since the circuits are becoming finer and denser. Accordingly, electroless plating is recently highly attractive method because of the simplicity of the operation requiring no external source of current and no elaborate equipment. In this work, we tried to develop a plating technique on electroless Ni/Au plating. First, the electroless Ni plating was deposited on the PCB with agitation in the bath at
. Then the Au layer was deposited on the Ni layer surface by same method at
. The bonderability were tested in order to evaluate the stability of the electroless Ni/Au by gold wire or solder ball test.
Effects of Adsorption Sites of the Polycrystalline Ir Surface on Potentially Deposited H
Chun Jang Ho ; Mun Kyeong Hyeon ;
Journal of the Korean Electrochemical Society, volume 2, issue 3, 1999, Pages 144~149
The two distinct adsorption sites and transition between the under and over-potentially deposited hydrogen (UPD H and OPD H) on the polycrystalline iridium (poly-Ir) surface in the 0.2 M LiOH electrolyte have been studied using the phase-shift method. At the forward and backward scans, the UPD H peak occurs on the cyclic voltam-mogram. The transition region on the phase-shift profile or the Langmuir adsorption isotherm occurs at ca. -0.80 to -0.95 V vs. SCE. At the transition region (-0.80 to -0.95 V vs. SCE), the equilibrium constant (K) for H adsorption transits from
and vice versa. Similarly, the standard free energy
of H adsorption transits from 6.3 to 21.8kJ/mol and vice versa. The UPD H and OPD H on the poly-Ir surface act as two distinguishable electroadsorbed H species. Both the UPD H peak and the transition region are attributed to the two distinct adsorption sites of the UPD H and OPD H on the poly-Ir surface.
Electrochemical Stability of Co-Mo and Ni-Mo Intermetallic Compound Electrodes for Hydrogen Electrode of Alkaline Fuel Cell
Lee C. R. ; Kang S. G. ;
Journal of the Korean Electrochemical Society, volume 2, issue 3, 1999, Pages 150~155
The Electrochemical stabilities of the Brewer-Engel type intermetallic compounds of Co-Mo
manufactured by the arc-melting method for the hydrogen electrode of
alkaline fuel cell were investigated. Effects of temperature and concentration on the electrochemical behavior of the electrodes in the
6 N KOH solution deaerated with
gas were studied by electrochemical methods. The effect of overpotential on the electrochemical stabilities of Co-Mo and Ni-Mo intermetallic compounds was also discussed under the normal operation condition of AFC. It was shown that Co-Mo electrode had lower electrochemical stability as compared to Ni-Mo. In the case of Co-Mo electrode, a simultaneous dissolution of cobalt and molybdenum has occurred at low anodic overpotential form equilibrium hydrogen electrode potential, but the dissolution of cobalt was serious, and Co(OH)l layer on the electrode surface formed at the high anodic overpotential. In contrast the Ni-Mo electrode had high electrochemical stability because formation of the dense and thin protective
layer prevented the dissolution of molybdenum.
A Study on the Fabrication of Lithium Iron Oxide Electrode and its Cyclic Voltammetric Characteristics
Jeong Won-Joong ; Ju Jeh-Beck ; Sohn Tai-Won ;
Journal of the Korean Electrochemical Society, volume 2, issue 3, 1999, Pages 156~162
Various types of iron oxide based materials as a cathode of lithium secondary battery have been prepared and their electrochemical characteristics have been also observed. In order to understand the fundamental characteristics of iron oxide electrode, three kinds of iron oxides such as iron oxides formed by direct oxidation of iron plate or iron powders and FeOOH powders were tested with cyclic voltammetry. The oxidation and reduction peaks due to the reaction of intercalation and deintercalation were not observed for the iron oxide prepared with iron plate and FeOOH powders. In case of iron oxide prepared from iron powders, only one reduction peak was observed. A layered form of
was synthesized directly from
and LiOH by hydrothermal reaction. The effect of NaOH on the electrode performance was examined. When increasing NaOH, it provides the electrode with less discharge capacity and efficiency, however, decreasing rate of discharge capacity became smaller.
synthesized with the molar ratio of
, 2/1/7 showed the largest capacity, but the discharging efficiency was sharply decreased after 30 cycles.
A Simulated Prediction for Influences of Operating Condition in an Alkaline Fuel Cell
Jo Jang-Ho ; Yi Sung-Chul ;
Journal of the Korean Electrochemical Society, volume 2, issue 3, 1999, Pages 163~170
The effects of the operating conditions in AFC single cells have not been studied in detail. In this study, by using a one-dimensional isothermal model a computational simulation was conducted to investigate the effects of the initial electrolyte concentration and the operating gas pressure. According to the result, the optimum electrolyte concentration at the base-case was found to be within
M. The variation of the cell performance according to the electrolyte concentration was found to be caused mainly by the charge transfer resistances of both electrodes, Henry's constant and the liquid phase diffusivity of the dissolved gases. It was also found that an increase in operating pressure increased the reaction rates and the solubilities of the gases, which led to a considerable enhancement of the cell performance.
Process and Characteristics of High Power Catalyst Electrode for PEM Fuel Cell
Chang H. ; Lim C. ; Kim J. ;
Journal of the Korean Electrochemical Society, volume 2, issue 3, 1999, Pages 171~175
Novel process for high power catalyst electrode for PEM fuel cell has been developed. MEA having this catalyst electrode showed
of Pt loading at aunospheric humid hydrogen and oxygen condition. In this process, platinized carbon and plain carbon powders were coated with ionomer (Nafion) and hydrophobic polymer (PTFE), respectively and it could maximize two roles of catalyst electrode, l.e., reaction and gas supplying component. Those polarization characteristics proved the improved performance by reducing potential drop especially in the concentration polarization region.