Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Electrochemical Properties of a Zirconia Membrane with a Lanthanum Manganate-Zirconia Composite Electrode and its Oxygen Permeation Characteristics by Applied Currents

  • Park, Ji Young (School of Nano & Materials Science and Engineering, Kyungpook National University) ;
  • Jung, Noh Hyun (Kceracell) ;
  • Jung, Doh Won (Material Research Center, Samsung Advanced Institute of Technology (SAIT)) ;
  • Ahn, Sung-Jin (Material Research Center, Samsung Advanced Institute of Technology (SAIT)) ;
  • Park, Hee Jung (Department of Materials Science and Engineering, Dankook University)
  • Received : 2019.03.02
  • Accepted : 2019.03.12
  • Published : 2019.03.31
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Abstract

An electrochemical oxygen permeating membrane (OPM) is fabricated using Zr0.895Sc0.095Ce0.005Gd0.005O2-δ (ScCeGdZ) as the solid electrolyte and aLa0.7Sr0.3MnO3-bScCeGdZ composite (LZab, electrode) as the electrode. The crystal phase of the electrode and the microstructure of the membrane is investigated with X-ray diffraction and scanning electron microscopy. The electrochemical resistance of the membrane is examined using 2-p ac impedance spectroscopy, and LZ55 shows the lowest electrode resistance among LZ82, LZ55 and LZ37. The oxygen permeation is studied with an oxygen permeation cell with a zirconia oxygen sensor. The oxygen flux of the OPM with LZ55 is nearly consistent with the theoretical value calculated from Faraday's Law below a critical current. However, it becomes saturated above the critical current due to the limit of the oxygen ionic conduction of the OPM. The OPM with LZ55 has a very high oxygen permeation flux of ~ 3.5 × 10-6 mol/㎠s in I = 1.4 A/㎠.

Keywords

References

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