Mechanistic aspects of ceria in SOC electrodes

Oxide ion conductivity is also of importance for achieving high performance in SOFG electrodes. Unfortunately, the ionic 

Water will form by the joining of neighboring OH groups on the ceria surface according to reaction (12.58), leaving an oxygen vacancy behind as water desorbs from the surface  

The electrons will be released to the current collector on the anode side when the cerium goes from Ce back to Ce  

Combining reactions (12.55) to (12.59) gives the overall reaction for the electrochemical oxidation of hydrogen in an SOFC as illustrated in Fig. 12.15. 

Several authors have found that the reducibility of ceria greatly depends on the exposed surface (see Section 12.3.2.3). Comparing 

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