Journal of Electrochemical Science and Technology

The Korean Electrochemical Society (한국전기화학회)
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The Role of Metal Catalyst on Water Permeation and Stability of BaCe0.8Y0.2O3-δ

  • Al, S. (Department of Chemical Engineering and Advanced Materials, Newcastle University) ;
  • Zhang, G. (Department of Chemical Engineering and Advanced Materials, Newcastle University)
  • Received : 2018.04.05
  • Accepted : 2018.06.11
  • Published : 2018.09.30
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Abstract

Perovskite type ceramic membranes which exhibit dual ion conduction (proton and oxygen ion conduction) can permeate water and can aid solving operational problems such as temperature gradient and carbon deposition associated with a working solid oxide fuel cell. From this point of view, it is crucial to reveal water transport mechanism and especially the nature of the surface sites that is necessary for water incorporation and evolution. $BaCe_{0.8}Y_{0.2}O_{3-{\alpha}}$ (BCY20) was used as a model proton and oxygen ion conducting membrane in this work. Four different catalytically modified membrane configurations were used for the investigations and water flux was measured as a function of temperature. In addition, CO was introduced to the permeate side in order to test the stability of membrane against water and $CO/CO_2$ and post operation analysis of used membranes were carried out. The results revealed that water incorporation occurs on any exposed electrolyte surface. However, the magnitude of water permeation changes depending on which membrane surface is catalytically modified. The platinum increases the water flux on the feed side whilst it decreases the flux on the permeate side. Water flux measurements suggest that platinum can block water permeation on the permeate side by reducing the access to the lattice oxygen in the surface layer.

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References

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