Solid electrolytes based on CeO2 for medium-temperature electrochemical devices

Pikalova, E. Yu.; Бамбуров, В. Г.; Мурашкина, А. А.; Neuimin, A.D.; Demin, A.; Плаксин, С. В.

doi:10.1134/s1023193511060127

Cited by 21 publications

(4 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Their low doping energies ensure that they are readily incorporated into CeO 2 while their low Δ E and low association energies indicate that the CCV is unlikely to be trapped by the dopant cations, thus aiding ionic conductivity. Gd- and Sm-doped CeO 2 have been widely studied, and their effectiveness for SOFC applications is well-known. ,,, A study by Pikalova et al measured the activation energy and conductivity for a series of rare-earth dopants and found the activation energy for Nd was slightly lower than for Gd and Sm, which corresponds with our calculated values of Δ E and association energy. Anjaneya et al found Sm to have the lowest activation energy and the highest ionic conductivity, although it should be noted that Gd, Sm, and Nd were all seen to have activation energies within 0.03 eV of each other.…”

Section: Discussionsupporting

confidence: 87%

Structure and Reducibility of CeO₂ Doped with Trivalent Cations

et al. 2016

View full text Add to dashboard Cite

The doping of CeO2 with trivalent cations is a common technique for enhancing ionic conductivity in electrolytes for solid oxide fuel cell applications. However, the local defect structure in these materials is yet to be fully explored. Furthermore, many studies have overlooked the effect of the dopants on the reducibility of CeO2, which is important as electronic conductivity can short-circuit the fuel cell. Density functional theory (DFT)+U calculations have been performed on a series of CeO2 systems doped with trivalent cations. The most stable configuration and the relative attraction between dopant cations and oxygen vacancies were determined, and it was found that the defect structure is principally dependent on the ionic radius of the dopant cations. The reduction energy was found to be dependent on the structure around the dopants but did not vary significantly between dopants of similar ionic radii. From these results, it is possible to suggest which trivalent cations would be most suitable to enhance ionic conductivity without increasing electronic conductivity in solid oxide fuel cell electrolytes.

show abstract

Section: Discussionsupporting

confidence: 87%

Structure and Reducibility of CeO₂ Doped with Trivalent Cations

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Ce0.8Gd0.2O1.9 (GDC20) solid electrolyte substrates for the electrochemical measurements were synthesized by solid-state reaction method as reported earlier [41] and sintered in air at 1620°C for 5 h. Sintered GDC20 ceramics were single-phase with cubic fluorite-like structure and had a relative density of 92% of theoretical.…”

Section: Electrode Fabrication and Electrochemical Studiesmentioning

confidence: 99%

Mixed ionic-electronic conductivity, phase stability and electrochemical activity of Gd-substituted La2NiO4+δ as oxygen electrode material for solid oxide fuel/electrolysis cells

Pikalova

Kolchugin

Zakharchuk

et al. 2021

International Journal of Hydrogen Energy

View full text Add to dashboard Cite

“…Твердые растворы на основе СеО 2 обладают высокой ионной проводимостью, при температурах ниже 800 • C в 4−5 раз превышающей проводимость ZrO 2 −Y 2 O 3 , высокой каталитической активностью к прямому окислению метана, низким взаимодействием с материалами катодов, что делает привлекательным их использование как в качестве материалов электролитов среднетемпературных ТОТЭ, так и в других ЭХУ -электролизерах и датчиках, а также в качестве компонента композитных электродов и каталитических мембран [8]. Исследования многокомпонентных систем на основе CeO 2 показали, что совместное легирование редкоземельными и щелочноземельными элементами приводит как к увеличению проводимости по сравнению с одиночно-легированными твердыми растворами, так и расширяет их электролитическую область за счет снижения уровня электронной проводимости в восстановительных условиях [9,10].…”

Section: Introductionunclassified