The effect of cobalt oxide sintering aid on electronic transport in Ce0.80Gd0.20O2−δ electrolyte

Reducibility of Ceria-Based Materials Exposed to Fuels and under Fuel/Air Gradients

“…Changes in oxygen stoichiometry are often determined by coulometric titration (Ferreira et al, 2000;Tikhonovic et al, 2002;Abrantes et al, 2003) using the cell design shown in Fig. 1.…”

“…2. On the other hand, coulometric titration results could be conveniently treated (Abrantes et al, 2003) to obtain an estimation of the mass action constant according to Eq. 9, without any assumption concerning the dependence of the oxygen loss on the oxygen partial pressure; this is represented in Fig.…”

“…Performance in these prospective applications is likely to be promoted by the redox behaviour of cerias. Thus, one has studied the onset of electronic conductivity of the most promising ceria-based materials Ce 1-x Gd x O 2-0.5x-Δδ (CGO) and Ce 1-x Sm x O 2-0.5x-Δδ (CSO), including its dependence on temperature and composition (Pérez-Coll et al, 2004;Abrantes et al, 2003). The impact of low temperature sintering with suitable additives on the onset of n-type contribution under reducing conditions has also been studied (Fagg et al, 2003).…”

“…Thus, one has studied the onset of electronic conductivity of the most promising ceria-based materials Ce 1-x Gd x O 2-0.5x-Δδ (CGO) and Ce 1-x Sm x O 2-0.5x-Δδ (CSO), including its dependence on temperature and composition (Pérez-Coll et al, 2004;Abrantes et al, 2003). The impact of low temperature sintering with suitable additives on the onset of n-type contribution under reducing conditions has also been studied (Fagg et al, 2003). In this chapter the dependence on oxygen partial is revised in detail, and corresponding effects imposed by fuels such as hydrogen or methane are examined by taking into account thermodynamic correlations between oxygen partial pressure and fuel conditions.…”

Optimization of SOFC Composite Cathodes Based on LSM and Doped Cerias Ce0.8Ln0.2O2-δ(Ln = Gd, Er, Tb and Pr)

“…CoO x , has been reported as a ceria sintering aid and promoter of the electronic conductivity through the grain boundaries [12][13][14][15] . Here, the addition of CoOx is intended to promote the formation of an electronic network that bridges the transport of electrons with the LSM particles.…”