• Proceedings of the Korean Society For Composite Materials Conference
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• 1999.11a
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• pp.40-43
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• 1999

Electrochemical surface treatment of PAN-based carbon fibers in acidic electrolyte has been studied in increasing the surface functional groups on fiber surfaces for the improvement of fiber-matrix adhesion of the resulting composites. According to the FT-IR and XPS measurements, it reveals that the oxygen functional groups on fibers are largely influence on the composite mechanical behaviors, whereas the nitrogen functional groups are not affected in the system. In this work, a good correlation between surface functionality and mechanical properties is established.

• Proceedings of the KIEE Conference
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• 2006.07c
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• pp.1402-1403
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• 2006

The sulphation is main deterioration of lead-acid batter, then there were many kinds of attempts to improve these problems and one of them is to add additives to the electrolyte. In this study some mixed additives such as silicate & boric acid and silicate & phosphoric acid were added to 38% $H_{2}SO_{4}$ electrolyte of lead acid battery to improve electrochemical properties of corrosion resistance, etc. of anode and cathode of lead acid battery.

• Journal of Electrochemical Science and Technology
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• v.15 no.2
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• pp.299-313
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• 2024

Electrochemical machining (ECM) is an effective manufacturing method for difficult-to-machine materials and is widely used in the precision manufacturing of aerospace components. In recent years, the requirements for the machining accuracy and surface integrity of ECM have become increasingly stringent. To further improve the machining quality, this work investigated the intricate laws between electrolyte filtration accuracy and machining quality. Electrolytes with different filtration accuracies were compared, and a numerical simulation was used to evaluate the change in temperature and bubble rate of the flow field in the machining area. Experiments were conducted on ECM of Ti-6Al-4V (TC4) alloy workpieces using electrolytes with different filtration accuracy. The workpiece machining accuracy and surface quality were analyzed, and the repetition accuracy of the workpiece was evaluated. The intricate laws between electrolyte filtration accuracy and machining quality were explored. It was found that when the electrolyte filtration accuracy is improved, so too is the machining quality of the ECM. However, once the filtration accuracy has reached a certain value, the machining quality has extremely limited improvement. By evaluating the repetition accuracy of processed workpieces in electrolytes with different filtration accuracies, it was found that when the filtration accuracy reaches a certain value, there is no positive correlation between the repetition accuracy and filtration accuracy. The result shows that, for the workpiece material and conditions considered in this paper, an electrolyte with 0.5㎛ filtration accuracy is suitable for the wide application of precision ECM.

• Journal of the Korean Institute of Telematics and Electronics A
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• v.31A no.2
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• pp.67-74
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• 1994

Effects of the GaAs semiconductor particles on electrophysical phenomena at the Pt electrode/10S0-3TM KCl aqueous electrolyte interfaces have been studied using voltammetric time based and electrochemical impedance techniques. The anodic decomposition effect f the GaAs semiconductor particles on electrophysical phenomena was significantly observed during the positive potential scan (0 to 1.0 V vs. SCE). On the other hand, the cathodic decomposition effect of the GaAs semiconductor particles was negligible during thenegative potential scan (0 to -1.0 V vs. SCE). The GaAs semiconductor particles act as current activators or mediators during the anodic process and act as charge screens during the cathodic process. The electrolyte resistance and related impedance was increased due to the presence of the GaAs semiconductor particles. The anodic decomposition effect of the GaAs semiconductor particles can directly be applied to activate the hydrogen evolution.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2000.05a
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• pp.24-24
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• 2000

• 한국전기화학회:학술대회논문집
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• 2001.10a
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• pp.46-46
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• 2001

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 1998.05a
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• pp.131-132
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• 1998

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2001.11a
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• pp.9-9
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• 2001

• Bulletin of the Korean Chemical Society
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• v.18 no.5
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• pp.549-552
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• 1997

• Current Photovoltaic Research
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• v.2 no.1
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• pp.18-27
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• 2014

Dye-sensitized solar cells (DSSCs), developed two decades ago, are considered to be an attractive technology among various photovoltaic devices because of their low cost, accessible dye chemistry, ease of fabrication, high power conversion efficiency, and environmentally friendly nature. A typical DSSCs consists of a dye-coated $TiO_2$ photoanode, a redox electrolyte, and a platinum (Pt)-coated fluorine-doped tin oxide (FTO) counter electrode. Among them, redox electrolytes have proven to be extremely important in improving the performance of DSSCs. Due to many drawbacks of iodide electrolytes, many research groups have paid more attention to seeking other alternative electrolyte systems. With regard to this, one-electron outer sphere redox shuttles based on cobalt complexes have shown promising results: In 2014, porphyrin dye (SM315) with the cobalt (II/III) redox couple exhibited a power conversion efficiency of 13% in DSSCs. In this review, we will provide an overview and perspectives of cobalt redox electrolytes in DSSCs.