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Mingyeong Kim,Kyungmin Kim,Seok Kim 한국탄소학회 2015 Carbon Letters Vol.16 No.1
Carbonate-type organic electrolytes were prepared using propylene carbonate (PC) and dimethyl carbonate (DMC) as a solvent, quaternary ammonium salts, and by adding different contents of 1-ethyl-3-methyl imidazolium tetrafluoroborate (EMImBF4). Cyclic voltammetry and linear sweep voltammetry were performed to analyze conducting behaviors. The surface characterizations were analyzed by scanning electron microscopy method and X-ray photoelectron spectroscopy. From the experimental results, increasing the EMImBF4 content increased the ionic conductivity and reduced bulk resistance and interfacial resistance. In particular, after adding 15 vol% EMImBF4 in 0.2 M SBPBF4 PC/DMC electrolyte, the organic electrolyte showed superior capacitance and interfacial resistance. However, when EMImBF4 content exceeded 15 vol%, the capacitance was saturated and the voltage range decreased.
Kim, Mingyeong,Kim, Ick-Jun,Yang, Sunhye,Kim, Seok Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.2
In this paper, organic solvent electrolytes were prepared by a mixture of propylene carbonate (PC), dimethyl carbonate (DMC), tetraethylammonium tetrafluoroborate ($TEABF_4$)s to evaluate the ionic properties of propylene carbonate (PC)/dimethyl carbonate (DMC) mixtures as solvents for a capacitor application, in view of improving the electrochemical performances. The bulk resistance and interfacial resistance of the mixture electrolytes were investigated using an AC impedance method. The morphology of carbon-based electrodes which were contained in different electrolytes was analyzed by scanning electron microscopy (SEM) method. From the experimental results, by increasing the FEC content, capacitance of electrodes was increased, and the interfacial resistance was decreased. In particular, by a content of 2 vol % FEC in 0.2 M $TEABF_4$ PC/DMC solvent, the electrolyte showed the superior capacitance. However, when FEC content exceeds 2 vol %, the capacitance was decreased and the interfacial resistance was increased.
( Mingyeong Kim ),( Jeryeong Kim ),( Minuk Ha ),( Minseo Bae ),( Juhee Kim ),( Ja-young Goo ),( Soonjae Lee ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
High resolution site characterization (HRSC) can support more effective remediation design and faster site cleanup. Recently, researches on HRSC techniques have conducted in Deokso area, Keonggi-do, Korea. In this research, we investigated the groundwater flow under different geological models constructed based on the detailed lithological and structural borehole log from the adjacent boreholes on the test bed. The conceptual hydrogeological models were constructed with homogeneous layer models as well as heterogeneous models. The homogeneous models were derived by interpolating observed contacts in borehole logs. Heterogeneous models were built by geostatistical simulation of lithology variables and material properties using T-PROGS. Over the generated hydrogeology model, the groundwater flow modeling was conducted using MODFLOW. The simulated groundwater flow field in homogeneous layer models were compared with the simulations in a heterogeneous model made with a T-PROGS tool. The simulation results showed that the groundwater flow varied greatly depending on configuration of the conceptual model as well as the resolution of geological survey data.
Mingyeong Kim,Ick-Jun Kim,Sunhye Yang,김석 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.2
In this paper, organic solvent electrolytes were prepared by a mixture of propylene carbonate (PC), dimethyl carbonate (DMC), tetraethylammonium tetrafluoroborate (TEABF4) as a salt, and by containing a different content of fluoroethylene carbonate (FEC) as an additive agent. The aim of this paper is to evaluate the ionic properties of propylene carbonate (PC)/dimethyl carbonate (DMC) mixtures as solvents for a capacitor application, in view of improving the electrochemical performances. The bulk resistance and interfacial resistance of the mixture electrolytes were investigated using an AC impedance method. The morphology of carbon-based electrodes which were contained in different electrolytes was analyzed by scanning electron microscopy (SEM) method. From the experimental results, by increasing the FEC content, capacitance of electrodes was increased, and the interfacial resistance was decreased. In particular, by a content of 2 vol % FEC in 0.2 M TEABF4 PC/DMC solvent, the electrolyte showed the superior capacitance. However, when FEC content exceeds 2 vol %, the capacitance was decreased and the interfacial resistance was increased.