Samarium-doped ceria

Ni-cermet type anodes have been improved by substituting the YSZ by ceria, gadolinium-doped ceria (GDC) and samarium-doped ceria (SDC). Ceria seems to increase the catalytic activity of the cermet for hydrogen oxidation, while SDC and GDC improve the ionic conductivity of the anode. Ni-ceria cermets are considered the main candidate for low-temperature SOFC [74],... 

Since complicated multicomponent ceramic materials with precise levels of doping are required for some of the new materials that show promise in solid oxide fuel cells, we aim to use the relatively low-cost, simple steric entrapment method to synthesize several solid oxide fuel cell materials, and evaluate some of their characteristics. We have selected lanthanum gallates doped with strontium and magnesium, samarium doped ceria and a promising non-stoichoimetric composition composed of strontium iron and cobalt. 

Di J, Chen M, Wang C, Zheng J, Fan L, Zhu B (2010), Samarium doped ceria-(Li/ Na)2COj composite electrolyte and its electrochemical properties in low temperature solid oxide fuel cell , 7 Power Sources, 195,4695 699. 

Fig. 9 (a) Raman spectra obtained from the fractured cross-section of a 4 mm thick Samarium doped Ceria electrolyte pellet exposed to a partial oxygen pressure differential of 4 x 10 and 0.21 atm of the fuel and air sides respectively at 1273 K. Spectra were collected as a function of distance (x) from the fuel side surface. Spectra have been labelled according to x normalised by the total thickness, L, of the pellet, (b) Experimental and theoretical profiles of the P(02) concentration through the electrolyte pellet calculated from the experimental Raman data and a empirical model of the ion diffusion through the pellet. Figure reproduced from reference [63]. 

Doria, S., Yang, N., Kumar, A., Jesse, S., Tebano, A., Aruta, C., Di Bartolomeo, E., Arruda, T.M., Kalinin, S.V., Licocda, S., and Balestrino, G. (2013) Nanoscale mapping of oxygen vacancy kinetics in nanocrystalline Samarium doped ceria thin films. Appl. Phys. Lett., 103, 171605-171608. 

Orsini, A., Tebano, A, licocda, S., Balestrino, G., and Traversa, E. (2009) Fabrication and electrochemical properties of epitaxial samarium-doped ceria films on SrTiOs-buffered MgO substrates. Adv. Funct. Mater., 19,1713-1719. 

Norton, T.T., Lu, B., and Lin, Y.S. (2014) Carbon dioxide permeation properties and stability of samarium-doped-ceria carbonate dual-phase membranes. /. Membr. Sci., 467,... 

CGO gadolinium-doped ceria (Cei jcGdjc02) cso samarium-doped ceria (Cei-jcSmjc02)... 

Ma, Y., Wang, X., Li, S. et al. (2010) Samarium-doped ceria nanowires novel synthesis and application in low-temperature solid oxide fuel cells. Adv. Mater, 22, 1640. 

P. P. Dholabhai and J. B. Adams, J. Mater. Sci., 47, 7530 (2012). A Blend of First-Principles and Kinetic Lattice Monte Carlo Computation to Optimize Samarium-Doped Ceria. 

It is interesting to see the work by Matsuzaki and Yasuda [18], who investigated Cr poisoning using different combinations of electrolyte and cathodes as electrolyte, they selected YSZ and samarium-doped ceria (SDC), and LSM and LSCF were selected as cathodes. As shown in Fig. 2.5, a potential drop from Cr poisoning is largest and most rapid for LSM/YSZ, whereas LSCF/... 

It is well known that the ionic conductivity of aliovalent-doped ceria solutions show a maximum at a certain dopant concentration and cation radius. Compared to divalent cation doping, however, trivalent dopants are observed to contribute higher conductivity values in ceria. Among trivalent rare earth metals, samarium and gadolinium are accepted as the most effective dopants. Therefore, we have selected a cermet made up of nickel and 20 at% samarium-doped ceria (SDC) as the anode material in our standard cells [12-14]. 

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