Enhanced ionic conductivity of co-doped ceria-carbonate nano composite electrolyte material for LT-SOFCs

2017 ◽  
Author(s):  
Kasarapu Venkataramana ◽  
Chittimadula Madhuri ◽  
C. Vishnuvardhan Reddy
Keyword(s):  
Ionic Conductivity ◽  
Doped Ceria ◽  
Composite Electrolyte ◽  
Nano Composite ◽  
Co Doped

Preparation and characterization of Sm and Ca co-doped ceria–La0.6Sr0.4Co0.2Fe0.8O3−δsemiconductor–ionic composites for electrolyte-layer-free fuel cells

2016 ◽  
Vol 4 (40) ◽  
pp. 15426-15436 ◽  
Author(s):  
Baoyuan Wang ◽  
Yi Wang ◽  
Liangdong Fan ◽  
Yixiao Cai ◽  
Chen Xia ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Ionic Conductivity ◽  
Oxygen Enrichment ◽  
Doped Ceria ◽  
Electrolyte Layer ◽  
Conductivity Enhancement ◽  
Co Doped

The oxygen enrichment at the interface leads to ionic conductivity enhancement for LSCF–SCDC composites, thus increasing the output of assembled EFFCs.

Some Structural Aspects of Ionic Conductivity in Co-Doped Ceria-Based Electrolytes

2013 ◽  
Vol 58 (4) ◽  
pp. 1355-1359 ◽  
Author(s):  
M. Dudek
Keyword(s):  
Solid Solution ◽  
Chemical Composition ◽  
Ionic Conductivity ◽  
Solid Oxide Fuel Cells ◽  
Solid Solutions ◽  
Transference Number ◽  
Solid Oxide ◽  
Doped Ceria ◽  
Oxide Fuel ◽  
Co Doped

Abstract The sinters of co-doped ceria solid solutions with the formula of Ce0.85Sm0.15-x RxO1.9, where R = Y, Gd, Pr, Tb, Ox-0.15, were obtained from powders synthesised by Pechini method. The linear variation of cell parameter a vs. chemical composition was observed for Ce0.85Sm0:15-xRxO1.9, where R = Y, Gd, Tb, 0 <x<0.15 samples. However, the introduction of Pr3+ into Ce0.85Sm0.15-x PrxO1.9 caused a small deviation from linearity due to possible changes in the valence from Pr3+ to Pr4+. The determined values of oxide transference number tion for Ce0.85Sm0.15-xRxO1.9, R = Y, Gd in the temperature range 400-750°C and partial oxygen pressure from 10-6 to 1 atm were close to 1, which indicated that materials investigated exhibited practically pure ionic oxide conductivity. On the other hand, the introduction of Tb3+ or Pr3+ higher than x>0.05 into solid solution Ce0.85Sm0.15-xRxO1.9, R = Tb, Pr caused a decrease in the ionic transference number tion below 1 due to an increase in partial electronic conduction. This fact limiting investigated co-doped terbia and samaria or samaria and praseodymia ceria-based solid solutions for the further application as oxide electrolytes in solid oxide fuel cells. The analysis of bulk and grain boundary values indicated that partial substitution of Sm3+ by Y3+ or Gd3+ caused slight improvements in the ionic conductivity of Ce0.85Sm0.15-xRxO1.9. The highest ionic conductivity was found for solid solution with chemical composition Ce0.85Sm0.1Y0.05O1.9. The selected co-doped ceria samples were tested as solid electrolytes in solid oxide fuel cells operating in the intermediate temperature range 500-750°C.

Enhanced ionic conductivity of co-doped ceria solid solutions and applications in IT-SOFCs

2014 ◽  
Vol 40 (7) ◽  
pp. 10901-10906 ◽  
Author(s):  
Monika Srivastava ◽  
Kuldeep Kumar ◽  
Nandini Jaiswal ◽  
Nitish Kumar Singh ◽  
Devendra Kumar ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Solid Solutions ◽  
Doped Ceria ◽  
Ceria Solid Solutions ◽  
Co Doped

The electrical properties of microwave sintered gadolinia doped ceria–alumina nano-composite electrolyte

2011 ◽  
Vol 196 (4) ◽  
pp. 1808-1817 ◽  
Author(s):  
Rajalekshmi Chockalingam ◽  
Sreekumar Chockalingam ◽  
Vasantha R.W. Amarakoon
Keyword(s):  
Electrical Properties ◽  
Doped Ceria ◽  
Composite Electrolyte ◽  
Nano Composite

scholarly journals Ionic Conductivity of Ce0.9-xGd0.1SmxO2-δ co-doped Ceria Electrolytes

2018 ◽  
Vol 134 (1) ◽  
pp. 122-124 ◽  
Author(s):  
A. Arabacı ◽  
M.F. Öksüzömer
Keyword(s):  
Ionic Conductivity ◽  
Doped Ceria ◽  
Co Doped

Synthesis and Characterization of (Gd, Y)-Doped Ceria Electrolytes for Solid Oxide Fuel Cell

2007 ◽  
Vol 336-338 ◽  
pp. 395-397
Author(s):  
Zhi Hui Liu ◽  
Xiang Feng Guan ◽  
He Ping Zhou
Keyword(s):  
Ionic Conductivity ◽  
Ionic Conductivities ◽  
Solid Oxide ◽  
Synthesis And Characterization ◽  
Doped Ceria ◽  
Oxide Fuel ◽  
Impedance Technique ◽  
Crystallite Sizes ◽  
Co Doped

Ceria electrolytes co-doped with Gd3+ and Y3+ (Ce0.8Gd0.2-xYxO1.9) were synthesized by GNP. The crystal structures, lattice parameters and crystallite sizes were determined by XRD. The morphology of the powders was observed by TEM. Sintered at 1250oC for 4 h, all die-pressed ceria pellets achieved densities higher than 95% of theoretical values. The ionic conductivities were measured using AC impedance technique and Ce0.8Gd0.05Y0.15O1.9 showed a higher ionic conductivity than those of other compositions at 500-750oC, indicating that it is an attractive electrolyte material for IT-SOFC.

scholarly journals Oxide ionic conductivity and microstructures of Pr and Sm co-doped CeO2-based systems

2018 ◽  
Vol 16 (1) ◽  
pp. 827-832 ◽  
Author(s):  
Aliye Arabacı
Keyword(s):  
Ionic Conductivity ◽  
Sem Analysis ◽  
Doped Ceria ◽  
X Ray Diffraction ◽  
X Ray ◽  
Fluorite Type ◽  
Doped Ceo2 ◽  
Oxide Ionic Conductivity ◽  
Total Ionic Conductivity ◽  
Co Doped

AbstractThe compositions Ce0.80Sm0.2-xPrxO2-δ (x=0-0.12) were prepared through the citrate-nitrate method. The synthesized Pr3+ and Sm3+ co-doped ceria powders with different compositions were calcined at 600°C for 3 h. Phase structure of the calcined powders was characterized by X-Ray diffraction (XRD) analysis.All the calcined samples were found to be ceria based solid solutions of fluorite type structures. The morphology examinations were carried out by scanning electron microscopy (SEM) analysis. Relative density of more than 91% of the theoretical can be achieved by sintering the Ce0.80Sm0.2-xPrxO2-δ pellets at 1400°C for 6 h. The two-probe a.c. impedance spectroscopy was used to study the ionic conductivity of the doped ceria samples. The Ce0.80Sm0.80Pr0.12O1.90 composition showed the highest total ionic conductivity value which is 2.39 × 10−2 S/cm at 600°C.

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