Surface oxygen exchange properties of bismuth oxide-based solid electrolytes and electrode materials

Boukamp, B.A. and Vinke, I.C. and Vries de, K.J. and Burggraaf, A.J. (1989) Surface oxygen exchange properties of bismuth oxide-based solid electrolytes and electrode materials. Solid State Ionics, 32-33 (Part 2). pp. 918-923. ISSN 0167-2738

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Abstract:	The surface oxygen exchange coefficient, ks, has been measured for the solid solution (Bi2O3)0.75(Er2O3)0.25 and (Bi2O3)0.6(Tb2O3)0.4 (abbreviated BE25 and BT40), using gas-phase 18O exchange techniques. The activation enth alpy of ks amounts to ΔE=110 kJ/molforBT40 andΔE=130 kJ/molforBE25. The magnitude of ks for the purely ionic conducting BE25 is comparable with values obtained from electrode polarization (I−V) measurements (ΔE=140 kJ/mol.) The comparatively high ks values show a (PO2)n dependence on oxygen pressure with values of n close to 0.5, indicating surface control in the oxygen transport process. Bismuth oxide containing solid solutions show a large activity in the oxygen exchange reaction with the gas phase.
Item Type:	Article
Copyright:	© 1989 Elsevier
Research Group:	Catalytic Processes and Materials (CPM)
Link to this item:	http://purl.utwente.nl/publications/70447
Official URL:	http://dx.doi.org/10.1016/0167-2738(89)90376-7
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