Comparative study of the nano-composite electrolytes based on samaria-doped ceria for low temperature solid oxide fuel cells (LT-SOFCs)

Khan, M. Ajmal; Raza, Rizwan; Lima, Raquel Bohn; Chaudhry, Madeeha; Ahmed, E.; Abbas, Ghazanfar

doi:10.1016/j.ijhydene.2013.05.060

Cited by 40 publications

(15 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…28 These results verify the presence of Na 2 CO 3 in SDCC and GDCC composite electrolytes. These TGA curves designate that neither intermediate compound nor chemical reaction take place between SDC and GDC with Na 2 CO 3 salt.…”

Section: Resultssupporting

confidence: 65%

High performance of SDC and GDC core shell type composite electrolytes using methane as a fuel for low temperature SOFC

et al. 2016

Self Cite

View full text Add to dashboard Cite

Nanocomposites Samarium doped Ceria (SDC), Gadolinium doped Ceria (GDC), core shell SDC amorphous Na2CO3 (SDCC) and GDC amorphous Na2CO3 (GDCC) were synthesized using co-precipitation method and then compared to obtain better solid oxide electrolytes materials for low temperature Solid Oxide Fuel Cell (SOFCs). The comparison is done in terms of structure, crystallanity, thermal stability, conductivity and cell performance. In present work, XRD analysis confirmed proper doping of Sm and Gd in both single phase (SDC, GDC) and dual phase core shell (SDCC, GDCC) electrolyte materials. EDX analysis validated the presence of Sm and Gd in both single and dual phase electrolyte materials; also confirming the presence of amorphous Na2CO3 in SDCC and GDCC. From TGA analysis a steep weight loss is observed in case of SDCC and GDCC when temperature rises above 725 °C while SDC and GDC do not show any loss. The ionic conductivity and cell performance of single phase SDC and GDC nanocomposite were compared with core shell GDC/amorphous Na2CO3 and SDC/ amorphous Na2CO3 nanocomposites using methane fuel. It is observed that dual phase core shell electrolytes materials (SDCC, GDCC) show better performance in low temperature range than their corresponding single phase electrolyte materials (SDC, GDC) with methane fuel.

show abstract

Section: Resultssupporting

confidence: 65%

High performance of SDC and GDC core shell type composite electrolytes using methane as a fuel for low temperature SOFC

et al. 2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…Similar thermal response was also observed in the SDC-carbonate composite electrolytes [30]. Therefore, the bright area is GDC ceramic phase while the dark zones are (Li/Na) 2 SO 4 phase [36,37].…”

Section: Resultssupporting

confidence: 78%

“…These composite electrolytes are co-ionic conductors including a doped ceria (Ce 0.8 Gd 0.2 O 2-δ , Ce 0.8 Y 0.2 O 2-δ and Ce 0.8 Sm 0.2 O 2-δ ) matrix and salts (chlorides, fluorides, hydroxides or carbonates) as a second phase. These composite electrolytes have a higher ionic conductivity (0.1 S cm -1 at 600 °C) than that of traditional doped ceria electrolytes (less than 0.02 S cm -1 at 600 °C) [25][26][27][28][29][30][31][32]. Compared with carbonate salts, sulphate-based salts have better thermal stability and higher conductivity [33].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Enhanced ionic conductivity in Gd-doped ceria and (Li/Na)2SO4 composite electrolytes for solid oxide fuel cells

Yao

Meng

Liu

et al. 2015

Solid State Sciences

View full text Add to dashboard Cite

“…Thus, this structure may be regarded as a rather open one [14,15]. Doped ceria materials with the fluorite structure have been extensively studied as potential electrolytes in IT-SOFCs [16][17][18][19][20], where oxygen vacancies can be introduced into the system when Ce 4þ cations are substituted by divalent alkaline and/or trivalent rare earth (RE) cations [21][22][23][24]. Ideally, the oxygen vacancies are randomly distributed throughout the oxide sublattice, which is an essential feature required for homogenous oxygen vacancy conduction.…”

Section: Introductionmentioning

confidence: 99%

“…The GB barriers are often described in the framework of a Schottky-type barrier model [32]. It had been shown previously that the synthesis of nanoparticles helps to achieve better ceramic sintering densification due to the increased sintering activity of high surface area powders [19,20,33], which then leads to reduced GB resistivity. In this context, microwave-hydrothermal synthesis has emerged as a time and energy efficient technique to produce nanosized ceria-based powders for IT-SOFC applications [34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Microwave synthesis & sintering of Sm and Ca co-doped ceria ceramics

Prado‐Gonjal

Heuguet

Muñoz-Gil

et al. 2015

International Journal of Hydrogen Energy

View full text Add to dashboard Cite

In this work we report on the combined use of microwave (MW) heating sources for the powder synthesis and the ceramic sintering of Sm and Ca co-doped ceria Ce0.8Sm0.18Ca0.02O1.9 polycrystalline materials for potential application as an electrolyte in intermediatetemperature solid oxide fuel cells (IT-SOFCs). We investigate the crystal structure, ceramic microstructure and the oxygen ion conductivity in detail and compare the latter to conventionally sintered ceramics. MW sintering of ceramic pellets leads to only slightly increased resistivity as compared to conventional sintering, but offers massive energy and time savings for potential industrial production processes. Exceptionally high oxygen ion conductivity without any significant electronic contribution was found in MW synthesized and MW sintered pellets, where the total resistivity, composed of grain boundary and bulk contributions, was found to be in the range of 0.5-1 k at 500 o C. Sm-and Ca co-doped ceria may be well-suited for electrolyte materials in IT-SOFCs..

show abstract

Comparative study of the nano-composite electrolytes based on samaria-doped ceria for low temperature solid oxide fuel cells (LT-SOFCs)

Cited by 40 publications

References 23 publications

High performance of SDC and GDC core shell type composite electrolytes using methane as a fuel for low temperature SOFC

High performance of SDC and GDC core shell type composite electrolytes using methane as a fuel for low temperature SOFC

Enhanced ionic conductivity in Gd-doped ceria and (Li/Na)2SO4 composite electrolytes for solid oxide fuel cells

Microwave synthesis & sintering of Sm and Ca co-doped ceria ceramics

Contact Info

Product

Resources

About