Synthesis, structure, microstructure, and electrical properties of Ce0.81Nd0.095Sm0.095O2−δ

Ramesh, S.; Naganathappa, Mahadevappa; Vemula, Jeevan

doi:10.1016/j.bsecv.2021.03.001

Cited by 6 publications

(8 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 6a shows the specific grain and normalized grain conductivity vs. 1000/T of the SDDC samples sintered at different temperatures. It is noticed that the specific grain conductivity values are higher than normalized grain conductivity (grain resistance depends only on porosity) [4,8]. The specific grain and normalized grain conductivity values are presented in Table 2.…”

Section: Electrical Propertiesmentioning

confidence: 98%

“…In this context, solid oxide fuel cells (SOFCs) are energy conversion devices with combined high heat and power efficiencies, long-term stability, fuel flexibility and low emissions [1,2]. Commercial YSZ electrolyte is operated at ∼1000 °C, resulting in chemical instability, microcracks formation and matching problems across different cell parts [3,4]. Under these circumstances, doped CeO 2 is an alternative electrolyte material with optimized electrical properties in the 500-700 °C range [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…Commercial YSZ electrolyte is operated at ∼1000 °C, resulting in chemical instability, microcracks formation and matching problems across different cell parts [3,4]. Under these circumstances, doped CeO 2 is an alternative electrolyte material with optimized electrical properties in the 500-700 °C range [3,4]. CeO 2 is not a good conductor even at 600 °C, but the proper doping could improve its electrical conductivity.…”

Section: Introductionmentioning

confidence: 99%

“…CeO 2 structure is cubic, and when dopant exceeds a certain doping percentage, the structure might change, which affects the oxygen vacancies. Thus, formation of a solid solution with proper doping concentration is challenging [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…Electrical properties depend on the activation energy of oxygen vacancies and can be expressed by following equation [4,5]:…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Effect of sintering temperature on microstructure and electrical properties of Ce0.82Dy0.155Sr0.025O2-δ electrolyte

Ramesh

2022

PAC

Self Cite

View full text Add to dashboard Cite

Ce0.82Dy0.155Sr0.025O2-? (SDDC) powder was synthesized by a sucrose-pectin modified sol-gel process. The powder was pressed and sintered at different temperatures, 1200, 1250 and 1300?C, to prepare dense ceramics with a relative density of 91, 93 and 95%TD, respectively. Crystal structure and phase composition were analysed by XRD using Rietveld refinement. The sample compositional analysis and element mapping were carried out by energy-dispersive spectroscopy. Microstructure images were recorded by scanning electron microscope. The electrical properties were measured by an impedance analyser. The grain resistance and the grain boundary resistance changed with the increased grain size. The SDDC electrolyte sintered at 1300?C exhibits an enhanced total electrical conductivity of 2.45?10?2 S/cm at 700?C and the activation energy of 0.76 eV. The porosity corrections are applied to the Bricklayer model to calculate the specific grain and grain boundary conductivities.

show abstract

Section: Electrical Propertiesmentioning

confidence: 98%