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Kim J.W.,Chonbuk National University | Kim N.H.,Chonbuk National University | Kuilla T.,Chonbuk National University | Kim T.J.,Core Technology Research Center for Fuel Cell | And 2 more authors.
Journal of Power Sources | Year: 2010

A hybrid carbon system of graphite powder (GP) and continuous carbon fibre fabric (CFF) is used for an epoxy composite to improve the electrical conductivity, mechanical properties and mouldability of a composite bipolar plate. These improvements are achieved simultaneously by inserting several layers of CFF into the GP/epoxy composite to enhance the mechanical properties and in-plane conductivity. The electrical properties, flexural strength and mouldability of the composite plates are measured as a function of conducting filler content and number of CFF layers. The composites show improved electrical conductivity, flexural properties and mouldability. Composites with 70-75 vol.% carbon fillers have the highest electrical conductivity with reasonable flexural properties. These results suggest that the poor mouldability and low through-plane electrical conductivity of the continuous fibre composite bipolar plate, as well as the weak flexural properties of GP composites, can be overcome by incorporating a GP/CFF hybrid system. © 2010 Elsevier B.V. All rights reserved. Source


Jung M.-J.,Chungnam National University | Im J.S.,Chungnam National University | Palanivelu K.,Chungnam National University | Palanivelu K.,Anna University | And 2 more authors.
Journal of Nanoscience and Nanotechnology | Year: 2010

A nano-composite consisting of Ti0 2-CNT was prepared via the sol-gel technique by using titanium n-butoxide along with carbon nano-tubes (CNTs) followed by calcination at 450 °C. Spectral analysis reveals that the Ti0 2 formed was present on the carbon in anatase form. The effect of adsorption was investigated in an aqueous solution of procion blue dye in a darkroom and the photochemical reaction in aqueous suspensions of titania composite under UV illumination. The reaction was studied by monitoring the discoloration of dye via employing a UV-Visible spectrophotometeric technique as a function of irradiation time. The composite catalyst was found to be efficient in the photodegradation of the dye. Copyright © 2010 American Scientific Publishers All. rights reserved. Source


Kang D.K.,Korea Research Institute of Chemical Technology | Noh C.S.,Chonbuk National University | Kim N.H.,Chonbuk National University | Cho S.-H.,Chonbuk National University | And 3 more authors.
Journal of Industrial and Engineering Chemistry | Year: 2010

Pure Pt, PtRu and Pt5Ru4M (M = Ni, Sn and Mo) electrocatalysts were prepared using a NaBH4 reduction method. The alloy formation and particle size of the electrocatalysts were determined by X-ray diffraction (XRD) and transmission electron microscopy (TEM), respectively. The formation of crystalline Pt was confirmed regardless of the addition of Ru and transition metals. The average particle size was found to be about 2.5-3.5 nm. The electrochemical properties of the electrocatalysts were analyzed by methanol electro-oxidation and CO stripping in the half cell. The mass activity and specific activity were obtained through these experiments. Methanol electro-oxidation and the specific activity of the PtRuNi electrocatalyst were much higher than that of PtRu electrocatalyst. The specific activity of methanol electro-oxidation based on EAS for the PtRuSn and PtRuMo electrocatalysts was higher than that of the PtRu, although their mass activity of methanol electro-oxidation was lower. Crown Copyright © 2010. Source


Kim I.-T.,Kunsan National University | Choi M.,Kunsan National University | An J.-C.,Research and Development Center | Lee H.-K.,Woosuk University | And 3 more authors.
Journal of Nanoscience and Nanotechnology | Year: 2010

PtPd nanoparticles on carbon black were prepared to investigate the role of Pd in the anode and cathode of a direct methanol fuel cell (DMFC). The PtPd catalysts in the anode showed a significantly lower performance than the PtRu catalyst. However, the cell performances of these catalysts in the cathode were comparable to that of the Pt catalyst. From cyclic voltammetry, it was observed that the Pd with the Pt catalyst lowered the peak potential and increased the coulombic charge for oxide reduction on the surface of the catalyst. Also, the Pd catalyst without Pt showed relatively high activity for oxygen reduction reaction. Copyright © 2010 American Scientific Publishers All rights reserved. Source

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