• Journal of the Korean institute of surface engineering
• /
• v.21 no.2
• /
• pp.68-75
• /
• 1988

To know the growth behavior of Conductive polyaniline file, the anodic oxidation of anilien on a platiunm in aqueous sulfuric acid solution has been studied. Cyclic votammetry and currenttime transisents method used to investigate the anodic oxidation of aniline to polyaniline films on a platinum. The oxidation of aniline is shown to occur in several steps dependent on the potential. it the phase growth resembles the deposition of a metal film.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.19 no.10
• /
• pp.598-602
• /
• 2018

This study examined the characteristics of the waste catalyst used in the petroleum refinery operations. The total pore volume, specific surface area, and average pore size of the spent catalyst used in the petroleum refinery operations were 3.96cc/g, 13.81m2/g, and 1.15A, respectively. The weight loss observed in the range from $25^{\circ}C-700^{\circ}C$ for the spent catalysts using TG and DTA was approximately 23 wt. %. EDS analysis of the waste catalyst sample showed that the five major components were vanadium, nickel, manganese, iron, and copper. The extraction system is attractive for liquid-liquid extraction. In this study, Cynex 272 was used to extract vanadium from waste catalyst. The electrochemical characteristics of the extracted vanadium solution were measured by cyclic voltammetry (CV). As a result, an oxidation / reduction peak appeared, indicating the potential of an electrolytic solution.

• Applied Chemistry for Engineering
• /
• v.3 no.1
• /
• pp.138-147
• /
• 1992

Chemically-modified electrodes were fabricated and their electrocatalytic behaviors have been investigated. As a modifying layer, poly-[1-methyl-3-(pyrrol-1-ylmethyl) pyridinium] was electropolymerized onto Pt electrodes under constant current. The thickness of the polymer film was controlled by means of total charge consumed during the electropolymerization. SEM was used to measure the thickness. There was a linear relationship between the passed charge and the film thickness. Ferro/ferricyanide, used as an electron mediator in this study, was rapidly ion-exchanged into the polymer layer with its concentration of 1.2~1.3M. It was found that electrooxidation of ascorbic acid is catalyzed by incorporated ferri/ferrocyanide couple. Kinetic parameters for electrooxidation were determined by RDE experiments. The results indicate that the present system corresponds to ER+S case based on the Saveant theory. Improving methods have been proposed to be R+S case which is ideal for electrocatalysis.

• Proceedings of the Korean Vacuum Society Conference
• /
• 2011.08a
• /
• pp.208-209
• /
• 2011

In this work, we developed self-assembled monolayers (SAMs) of alkanethiols on gold that can release amine groups, when an electrical potential was applied to the gold. The strategy was based on the introduction of the electroactive carbamate group, which underwent the two-electron oxidation with simultaneous release of the amine molecules, to alkanethiols. The synthesis of the designed thiol compounds was achieved by coupling isocyanate-containing compound with hydroquinone. The electroactive thiols were mixed with hydroxyl-containing alkanethiol [$HS(CH_2)_{11}OH$] to form mixed monolayers, and cyclic votammetry was used for the characterization of the release. The mixed SAMs showed a first oxidation peak at +540 mV (versus Ag/AgCl reference electrode), demonstrating irreversible conversion from carbamate to hydroqinone with simultaneous release of the amine groups. The second and third cycles showed typical reversible redox reaction of hydroquinone and quione: the oxidation and reduction occurred at +290 mV and -110 mV, respectively. The measurement of ToF-SIMS further indicates that electrochemical-assisted chemical reaction successfully released amine groups. This new SAM-based electrochemistry would be applicable for direct release of biologically active molecules that contain amine groups.

• Journal of Korean Society of Environmental Engineers
• /
• v.34 no.11
• /
• pp.715-719
• /
• 2012

We investigated the effects of electrochemical characteristics and generation of chlorine by the different amount of Ru coating which was prepared for $RuO_2$/Ti electrode coated with 1.5 mg, 2.5 mg, 5.5 mg, 8.5 mg Ru per unit area ($cm^2$). As a Result of the cycle voltammetry experiments, chlorine overvoltage of Ru-coated electrodes showed to be the nearly sustained value of approximately 1.15V (vs. Ag/AgCl). By contrary, According to the results of the AC impedance spectroscopy and potentiodynamic polarization tests, the amount of Ru per unit area ($cm^2$) included 2.5 mg, 3.5 mg as $RuO_2$/Ti offered the highest levels of durability which was electrode resistance and corrosion rate appeared to be $0.4582{\Omega}$, $0.5267{\Omega}$ and 0.082 mm/yr, 0.058 mm/yr, respectively. It was also observed that generation of chlorine coated with 3.5 mg per unit area ($cm^2$) was the highest value of 15.2 mg/L.