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Träfflista för sökning "WFRF:(Shim Joon Hyung) srt2:(2017)"

Sökning: WFRF:(Shim Joon Hyung) > (2017)

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1.
  • Kim, Jun Woo, et al. (författare)
  • 3D EVALUATION OF THERMAL STRESSES ON CERAMIC-METAL COMPOSITES USED AT HIGH TEMPERATURE OPERATION
  • 2017
  • Ingår i: 5TH IIR INTERNATIONAL CONFERENCE ON THERMOPHYSICAL PROPERTIES AND TRANSFER PROCESSES OF REFRIGERANTS (TPTPR). - : INT INST REFRIGERATION. - 9782362150203 ; , s. 771-775
  • Konferensbidrag (refereegranskat)abstract
    • Ceramic-metal composites (CMC) have been used for various high temperature applications including combustion engines, steam and gas turbines, industrial heaters and ceramic fuel cells. Reliable incorporation of the CMC at elevated temperatures, however, is very difficult in practice for the following reasons. First, meting and sublimation points of those solids are different causing undesired diffusion and mixing of elements across the material boundaries degrading functions of the materials. Secondly, maintaining temperature and pressure regimes for desired phases of the component materials is challenging during operation in many of practical cases. Lastly, thermal expansion rates of those two materials are significantly different frequently causing mechanical stresses and fractures. There have been numerous efforts to evaluate and design the CMC materials to minimize the thermo-mechanical stresses. Among various techniques, the focused ion beam-scanning electron microscope (FIB-SEM) tomography has been proved as a state-of-art technique to obtain 3D compositional and structural information of the CMC materials. In this study, we have evaluated thermal stresses applied on nickel-zirconia CMCs by using the FIB-SEM 3D tomography and finite element analysis.
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2.
  • Woo Kim, Jun, et al. (författare)
  • Compositional optimization of gadolinia-doped ceria treatment for enhanced oxygen reduction kinetics in low-temperature solid oxide fuel cells
  • 2017
  • Ingår i: Thin Solid Films. - : Elsevier. - 0040-6090 .- 1879-2731. ; 624, s. 95-100
  • Tidskriftsartikel (refereegranskat)abstract
    • We report the optimization of the dopant concentration of gadolinia-doped ceria (GDC) to enhance the oxygen reduction reaction (ORR) kinetics for low-temperature solid oxide fuel cells (LTSOFCs). Crystalline GDC layers with uniform nano-granular structures were prepared by aerosol-assisted chemical vapor deposition (AACVD) on the cathode side of a GDC electrolyte. The current-voltage (I-V) characteristics and power performances of the AACVD GDC-treated cells were measured and their cathodic reactions were analyzed by electrochemical impedance spectroscopy (EIS) to investigate the effect of GDC treatments with various dopant compositions. The cell treated with Gd0.14Ce0.86O2-delta was found to show an optimized power performance with the best ORR kinetics, due to its nano-granular structure and high concentration of oxygen vacancies. (C) 2017 Published by Elsevier B.V.
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  • Resultat 1-2 av 2
Typ av publikation
konferensbidrag (1)
tidskriftsartikel (1)
Typ av innehåll
refereegranskat (2)
Författare/redaktör
Kim, Nam Keun (2)
Stenfelt, Stefan (1)
Kim, Jun Woo (1)
Shim, Joon Hyung (1)
Woo Kim, Jun (1)
Young Jang, Dong (1)
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Kim, Manjin (1)
Jeong, Heonjae (1)
Hyung Shim, Joon (1)
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Linköpings universitet (2)
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Engelska (2)
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Naturvetenskap (1)
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2017 (2)Ta bort avgränsningen

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