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Keiko Ideta,김두원,김태곤,Koji Nakabayashi,Jin Miyawaki,박주일,윤성호 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.102 No.-
The effect of pore size on the response characteristic of an electric double layer capacitor (EDLC) wasclosely examined. A series of phenol-resin-based activated carbon (AC) samples was prepared as averagepore size from 0.94 to 1.68 nm by KOH activation by varying the activation temperature andKOH/carbonized phenol-resin ratio. The impedance properties of pouch-type EDLC cells prepared usingAC samples were evaluated by applying an alternating current at 3 V between 10 mHz and 100 kHzfor confirming the response characteristic. The cell based on the AC with a largest pore size (1.68 nm)showed fast response frequency, and had a high dielectric relaxation time constant as calculated fromthe response frequency value. The AC with the largest pore size, which consisted of both micropores(>1 nm) and mesopores (2–4 nm), was confirmed to facilitate extremely low electrolyte-diffusion resistanceduring the formation of the electric double layer, implying that the large pores lead to fast andstable response frequency. The presented findings suggest that AC with a largest pore size as the electrodeleads to superior capacitance and response frequency characteristics in the alternating current thanthose of an AC with a smaller pore size.
Structural pore elucidation of super-activated carbon based on the micro-domain structure model
김태곤,김두원,Keiko Ideta,박초이,Jin Miyawaki,박주일,윤성호 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.101 No.-
For elucidation of the pore structure of super-activated carbon (SAC) based on the micro-domain structuremodel, a new experiment of inverse approach was designed by ball-mill treatment. The two representativeSACs with an ultra-high specific surface area ( 3000 m2 g 1) used Maxsorb-III as a nongraphitizablecarbon and M-30 as a graphitizable carbon, which are derived from petroleum coke andmeso-phase carbon microbeads (MCMB), respectively. SACs consisting of micro-domains, are destroyedduring ball milling due to the weak-interactions between the micro-domains. The formation mechanismsof their intra-particular pores (internal slit-like micropores in micro-domain) and inter-particular pores(channeled mesopores between microdomains) are successfully explained by the N2 adsorption/desorptionisotherms, FE-SEM, HR-TEM, STEM, and electrochemical techniques. In addition, their capacitancebehaviors using different electrolytes as a probe are clearly matched with the change of micro- and mesoporesthrough the ball-mill treatment. This novel micro-domain structure model for porous carbon materialssuccessfully accounts for critical limitations of the conventional hierarchical pore structure model.
Yong Jiang,Keiko Ideta,김잔디,Jin Miyawaki,정두환,윤성호,Isao Mochida 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.22 No.-
The crystalline and microstructural transformations of two laboratory ashes and their quenched slags(froma gasifier) with similar chemical compositions (one with high silicon dioxide (SiO2) concentrationsand the other with high aluminum oxide (Al2O3) concentrations)were systematically characterized usingX-ray diffraction, multinuclear solid-state nuclear magnetic resonance, and a high-temperatureviscometer. The results show that the content of SiO2 and Al2O3 in ash has significant influence onthe crystal types and size of cristobalite clusters in the liquid slag during heat treatment. Consequently,the formed cristobalite clusterswas the crucial to the viscosities and rheological properties of liquid slags.
Analysis of water in Loy Yang brown coal using solid-state 1H NMR
김현석,윤성호,Yusuke Nishiyama,Keiko Ideta,Jin Miyawaki,Yohsuke Matsushita,박주일,Isao Mochida 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.5
1H spin-echo MAS NMR and 1H saturated spin-echo MAS NMR were applied to classify the water in Loy Yang coal. Adsorbed water was examined based on the proton spectra, in which four major portions were identified according to the moisture contents. Free water could be quantified by analyzing the proton free induction decays (FIDs) obtained using the 1H saturated spin-echo technique. By comparing the proton intensity of the C–H portion to the aromatic and N portion in the proton spectra, and by evaluating the FIDs, the water in Loy Yang coal could be classified.
Yong Jiang,윤성호,Xiongchao Lin,Keiko Ideta,Hiromichi Takebe,Jin Miyawaki,Isao Mochida 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
The transformation of the Si-Al microstructures of slags, which have similar SiO2 + Al2O3 and CaO contents but different SiO2/Al2O3 ratios, was quantified using multinuclear SS-NMR. Three kinds of Si Qn microstructures (Q2, Q3, and Q4), where n denotes the number of bridging oxygen linked to other Si atoms for each Q (SiO4) unit, and one Al structure (Al (IV)) were present in both slags. The Q3 percentage in two slags was increased as increase of temperature from 1200 to 1600 8C. The transformation of Si-Al microstructures was interpreted by a hypothetic model of cristobalite cluster based on the crystal and Qn structure.