Jeonju Institute of Machinery and Carbon Composites

Jeonju, South Korea

Jeonju Institute of Machinery and Carbon Composites

Jeonju, South Korea

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Ra E.J.,Sungkyunkwan University | Kim T.H.,Sungkyunkwan University | Yu W.J.,Sungkyunkwan University | An K.H.,Jeonju Institute of Machinery and Carbon Composites | Lee Y.H.,Sungkyunkwan University
Chemical Communications | Year: 2010

We propose a new chemical route for forming ultramicropores in carbon nanofibers by using a pore former, camphor, in electrospun polyacrilnitrile nanofibers. The resulting carbon nanofibers form mostly ultramicropores. Total specific surface area was 886 m2 g-1, which is similar to the activated carbon nanofibers in CO2 and steam activation. © 2010 The Royal Society of Chemistry.


Kim B.-J.,Jeonju Institute of Machinery and Carbon Composites | Cho K.-S.,Korea University | Park S.-J.,Inha University
Journal of Colloid and Interface Science | Year: 2010

Copper oxide-loaded porous carbons (PCs) for high efficient carbon dioxide capture were prepared. Copper oxides were loaded onto porous carbons by a postoxidation method involving copper electroplated PCs at 300 °C in an air stream. Additionally, porous carbons were prepared from ion-exchangeable polymeric resin by a chemical activation method. The microstructure of the copper oxide/PCs was characterized by XRD, and the formation of copper oxides after the postoxidation process was confirmed by XPS. The carbon dioxide adsorption behaviors were evaluated by a PCT (pressure-composition-temperature) apparatus at 298 K and 1.0 atm. It was found that the presence of copper oxides significantly led to an increase in the carbon dioxide adsorption capacity of the carbons. Copper oxide nanoparticles have electron-donor features, resulting in the enhancement of adsorption capacity of carbon dioxide molecules, which have an electron acceptor feature. © 2009.


Yim Y.-J.,Chonbuk National University | Seo M.-K.,Jeonju Institute of Machinery and Carbon Composites | Kim H.-Y.,Chonbuk National University | Park S.-J.,Inha University
Polymer (Korea) | Year: 2012

In this work, the effect of multi-walled carbon nanotube (MWCNT) on electromagnetic interference shielding effectiveness (EMI SE) and mechanical properties of MWCNT-reinforced polypropylene (PP) nanocomposites were investigated with varying MWCNT content from 1 to 10 wt%. Electric resistance was tested using a 4-point-probe electric resistivity tester. The EMI SE of the nanocomposites was evaluated by means of the reflection and adsorption methods. The mechanical properties of the nanocomposites were studied through the critical stress intensity factor (K IC) measurement. The morphologies were observed by scanning electron microscopy (SEM). From the results, it was found that the EMI SE was enhanced with increasing MWCNT content, which played a key factor to determine the EMI SE. The K IC value was increased with increasing MWCNT content, whereas the value decreased above 5 wt% MWCNT content. This was probably considered that the MWCNT entangled with each other in PP due to an excess of MWCNT.


Kim B.-J.,Jeonju Institute of Machinery and Carbon Composites | Choi W.-K.,Jeonju Institute of Machinery and Carbon Composites | Um M.-K.,Korea Institute of Materials Science | Park S.-J.,Inha University
Surface and Coatings Technology | Year: 2011

In this work, nickel/carbon hybrid fibers were prepared by the electrolytic plating on carbon fibers in order to improve electric conductivity of the carbon fibers; the effects of nickel content and coating thickness on the electric conductivity of the fibers were studied. The structural properties and surface morphologies of the hybrid fibers were characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The electric conductivity of the fibers was measured using a 4-point probe method. As for experimental results, it was observed that the electric conductivity of the nickel/carbon hybrid fibers was dramatically increased in the presence of metallic nickel particles, with the best result in the condition of over 0.75 μm of the thickness due to the minimization of the inner pores. © 2010 Elsevier B.V.


Seo M.-K.,Jeonju Institute of Machinery and Carbon Composites | Kuk Y.-S.,Jeonju Institute of Machinery and Carbon Composites | Kuk Y.-S.,Chonbuk National University | Park S.-J.,Inha University
Journal of Nanoscience and Nanotechnology | Year: 2013

In this work, electrochemical properties of a bilayer electrode system prepared from an electrically conducting polymer, poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate), PEDOT-PSS coated carbon nanofibers (CNFs), have been investigated. The CNFs were used as supports for the deposition of PEDOT-PSS by a dip-coating technique to yield a bilayer electrode system. Electrodes prepared by such a method were used in supercapacitors operating in acidic (1 M H2SO4) electrolytes. The capacitance values were estimated by voltammetry and galvanostatic techniques with a three-electrode cell configuration. Due to the CNF's graphitic structure and the presence of exterior walls with numerous edges, a high specific surface area and easily accessible electrode/electrolyte interface were obtained, thus yielding good capacitance in the bilayer active materials. The capacitance for PEDOT-PSS coated CNF bilayer electrodes ranged from 80 to 180 F/g and the fabricated materials showed good cycling performance with high stability in aqueous electrolytes. This was probably due to enhanced access to the CNFs, leading to the generation of a double layer and, ultimately, higher values of the capacitance. Copyright © 2013 American Scientific Publishers.


Kim B.-J.,Jeonju Institute of Machinery and Carbon Composites | Park S.-J.,Inha University
International Journal of Hydrogen Energy | Year: 2011

Nickel/graphite hybrid materials were prepared by mixed acid treatment of graphite flakes, following metal nanoparticle deposition. The textural properties were studied by BET surface area measurement and t-plot methods with N2/77 K adsorption isotherms. The hydrogen storage characteristics of the nickel/graphite at 298 K and 10 MPa were studied using a pressure-composition-temperature apparatus. The pore structure of the materials was studied as a function of processing conditions. In the optimum material, the hydrogen storage capacity was as high as 4.48 wt.%. The total amount of storage was not proportional to the specific surface area or metal content of the adsorbate. A dipole-induced model on nickel/carbon surfaces is proposed for the hydrogen storage mechanism. © 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.


Kim B.-J.,Jeonju Institute of Machinery and Carbon Composites | Byun J.-H.,Korea Institute of Machinery and Materials | Park S.-J.,Inha University
Bulletin of the Korean Chemical Society | Year: 2010

In this work, mechanical and electrical properties of graphenes (GP)/carbon nanotubes (CNTs) co-reinforced high density polyethylene (HDPE) matrix composites were studied. The microstructure, morphologies, and electric properties of the composites were evaluated by XRD, TEM, and 4-probe methods, respectively. It was found that the electric resistivity of 0.5 wt %-GP/HDPE was immeasurable, and 2.0 wt %-CNTs/HDPE showed high resistivity (6.02 × 104 Ω·cm). Meanwhile, GP (0.5 wt %)/CNTs (2.0 wt %)/HDPE showed excellent low resistivity (3.1 × 102 Ω·cm). This result indicates that the co-reinforcement systems can dramatically decrease electric resistivity of the carbon/polymer nanocomposites.


Kim B.-J.,Jeonju Institute of Machinery and Carbon Composites | Bae K.-M.,Inha University | Park S.-J.,Inha University
Microporous and Mesoporous Materials | Year: 2012

The removal of elemental mercury vapor on copper-coated porous carbonaceous materials (Cu/PC) was investigated. An electroless plating method was employed for Cu coating on PC surface and each sample was named as as-received, Cu-5-1.9, Cu-10-2.4, Cu-15-3.3, and Cu-25-5.8 according to the plating time and resulting metal content. The pore structures and total pore volumes of the Cu/PC were examined by N 2/77 K adsorption isotherms. The microstructure and surface morphology of the Cu/PC were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The elemental mercury adsorption capacities of all Cu/PC were higher than those of the as-received porous carbonaceous materials despite the decrease in the specific surface area and total pore volume after the Cu coating. The mercury removal capacity was proportion to a Cu content up to Cu-15-3.3, and showed a decrease. On the other hand, the Cu 2O/Cu ratio was lowest at Cu-25-5.8, even though the textural properties of Cu-15-3.3 and Cu-25-5.8 were similar. This suggests that the surface oxidation level of Cu particles and total Cu content can determine the mercury removal capacity of the PC due to the chemical affinity between the Cu particles and elemental mercury vapor. © 2012 Elsevier Inc. All rights reserved.


Kim B.-J.,Jeonju Institute of Machinery and Carbon Composites | An K.H.,Jeonju Institute of Machinery and Carbon Composites | Park S.-J.,Inha University
Journal of Nanoscience and Nanotechnology | Year: 2011

In this work, Porous Carbons (PCs) were prepared by using a chemical acid treatment, and the hydrogen storage behaviors of PCs doped by Pt nanoparticles were investigated. The hydrogen storage capacities of the Pt-doped carbons with a platinum content of 0.2-1.5 wt% were evaluated by a volumetric adsorption method at 298 K and 10 MPa. The microstructures of samples were examined by XRD and SEM. It was found that the hydrogen storage capacities of the PCs dramatically increased, but the amount of hydrogen stored from the samples began to decrease after 0.6 wt% of Pt content due to the pore blocking. These results indicate that a suitable amount of supported catalysts and layer intervals of carbons had a very important impact on hydrogen storage behaviors. Copyright © 2011 American Scientific Publishers All rights reserved.


Seo M.-K.,Jeonju Institute of Machinery and Carbon Composites | Seo M.-K.,Inha University | Park S.-J.,Inha University
Bulletin of the Korean Chemical Society | Year: 2012

In this work, we prepared activated multi-walled carbon nanotubes/polyacrylonitrile (A-MWCNTs/C) composites by film casting and activation method. Electrochemical properties of the composites were investigated in terms of serving as MWCNTs-based electrode materials for electric double layer capacitors (EDLCs). As a result, the A-MWCNTs/C composites had much higher BET specific surface area, and pore volume, and lower volume ratio of micropores than those of pristine MWCNTs/PAN ones. Furthermore, some functional groups were added on the surface of the A-MWCNTs/C composites. The specific capacitance of the A-MWCNTs/C composites was more than 4.5 times that of the pristine ones at 0.1 V discharging voltage owing to the changes of the structure and surface characteristics of the MWCNTs by activation process. Copyright © 2005 KCSNET.

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