Structural and electrochemical characterization of La2−xSrxNiTiO6−δ

Pérez-Flores, Juan Carlos; Ritter, C.; Pérez-Coll, Domingo; Mather, Glenn C.; Canales‐Vázquez, Jesús; Gálvez-Sánchez, María; Garcı́a-Alvarado, F.; Amador, Ulises

doi:10.1016/j.ijhydene.2011.10.101

Cited by 16 publications

(12 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They also reported that La 2-x Sr x NiTiO 6-δ -based electrodes exhibit polarization resistances of >1.5 Ω cm 2 under oxidizing conditions at 800 °C. [ 255 ] In comparison to strontium doping, the creation of vacancies in the perovskite A-site seems to be a more favorable strategy for improving the electrochemical performance of this system. Different from A-site defi cient LNF, the ability to form 20% La site defi ciency in La 1.80 NiTiO 6− δ is owing to the high Ti-O bond energy.…”

Section: Review (11 Of 34) 1500537 Wileyonlinelibrarycommentioning

confidence: 99%

Advances in Cathode Materials for Solid Oxide Fuel Cells: Complex Oxides without Alkaline Earth Metal Elements

Chen

Zhou

Ding

et al. 2015

Advanced Energy Materials

256

155

View full text Add to dashboard Cite

Solid oxide fuel cells (SOFCs) represent one of the cleanest and most efficient options for the direct conversion of a wide variety of fuels to electricity. For example, SOFCs powered by natural gas are ideally suited for distributed power generation. However, the commercialization of SOFC technologies hinges on breakthroughs in materials development to dramatically reduce the cost while enhancing performance and durability. One of the critical obstacles to achieving high‐performance SOFC systems is the cathodes for oxygen reduction reaction (ORR), which perform poorly at low temperatures and degrade over time under operating conditions. Here a comprehensive review of the latest advances in the development of SOFC cathodes is presented: complex oxides without alkaline earth metal elements (because these elements could be vulnerable to phase segregation and contaminant poisoning). Various strategies are discussed for enhancing ORR activity while minimizing the effect of contaminant on electrode durability. Furthermore, some of the critical challenges are briefly highlighted and the prospects for future‐generation SOFC cathodes are discussed. A good understanding of the latest advances and remaining challenges in searching for highly active SOFC cathodes with robust tolerance to contaminants may provide useful guidance for the rational design of new materials and structures for commercially viable SOFC technologies.

show abstract

Section: Review (11 Of 34) 1500537 Wileyonlinelibrarycommentioning

confidence: 99%

Advances in Cathode Materials for Solid Oxide Fuel Cells: Complex Oxides without Alkaline Earth Metal Elements

Chen

Zhou

Ding

et al. 2015

Advanced Energy Materials

256

155

View full text Add to dashboard Cite

show abstract

“…The optical Fourier transforms (FTs) performed on those HREM micrographs only show the maxima corresponding to the simplecubic perovskite and therefore the whole crystal seems to be homogeneous, i.e., there are no domains that could evidence the presence of additional ordering (see ESI †). However, in the case of the Sr 2 CoNbO 6 oxide the HREM image along the [1][2][3][4][5][6][7][8][9][10] direction, see Fig. 2a, clearly reveals the presence of structural domains corresponding to a double-perovskite cell (labelled as A in Fig.…”

Section: Microstructure and Short-range Structurementioning

confidence: 99%

Complex magnetic behaviour of Sr₂CoNb_1−xTi_xO₆(0 ≤ x ≤ 0.5) as a result of a flexible microstructure

et al. 2015

View full text Add to dashboard Cite

We report the rich magnetic behaviour of Sr2CoNb1-xTixO6 (0 ≤ x ≤ 0.5) oxides as a result of their complex microstructure. Although these oxides show an average simple-cubic perovskite structure, they present a flexible microstructure due to short-range ordering between Co/Ti and Nb cations in the perovskite B-sites. The microstructure consists of double-cubic perovskite domains grown in a simple-cubic perovskite matrix. The size and number of the double-cubic perovskite domains decrease as the Ti content increases. As a result of aliovalent substitution of Nb(5+) by Ti(4+) in the parent Sr2CoNbO6 mixed-valence Co(3+)/Co(4+) oxides are obtained. A spin glass-like state has been observed at low temperatures for all the series, with freezing temperatures increasing with the Ti-content in the range 22 to 33 K. Furthermore, the x = 0.3 and x = 0.5 samples show non-interacting superparamagnetic particle-like dynamics associated with relatively high amounts of Co(4+), with "blocking temperatures" of 13 and ∼16 K, respectively. The complex magnetic behaviour of the title oxides seems to be connected with the clustering of magnetic Co(3+) and the distribution of Co(4+) as a result of the microstructure.

show abstract

“…Although no relevant differences of the thermal evolution of both log 10 (σT) or log 10 (σT 3/2 ) are observed; on the basis of the results of similar materials [17][18][19] we assume the first approach, adiabatic small-polaron-hopping transport mechanism [56][57][58] as responsible for p-type conduction in our materials. The values of activation energies are somewhat high, ranging from 0.62-0.71 eV and similar to that reported for the parent phase, La 2 CoTiO 6 17 indicating that the same conduction mechanism is operating over the whole series.…”

Section: Please Do Not Adjust Marginsmentioning

confidence: 86%

The A-cation deficient perovskite series La_2−xCoTiO_6−δ (0 ≤ x ≤ 0.20): new components for potential SOFC composite cathodes

et al. 2016

View full text Add to dashboard Cite

show abstract

Structural and electrochemical characterization of La2−xSrxNiTiO6−δ

Cited by 16 publications

References 51 publications

Advances in Cathode Materials for Solid Oxide Fuel Cells: Complex Oxides without Alkaline Earth Metal Elements

Advances in Cathode Materials for Solid Oxide Fuel Cells: Complex Oxides without Alkaline Earth Metal Elements

Complex magnetic behaviour of Sr₂CoNb_1−xTi_xO₆(0 ≤ x ≤ 0.5) as a result of a flexible microstructure

The A-cation deficient perovskite series La_2−xCoTiO_6−δ (0 ≤ x ≤ 0.20): new components for potential SOFC composite cathodes

Contact Info

Product

Resources

About

Structural and electrochemical characterization of La2−xSrxNiTiO6−δ

Cited by 16 publications

References 51 publications

Advances in Cathode Materials for Solid Oxide Fuel Cells: Complex Oxides without Alkaline Earth Metal Elements

Advances in Cathode Materials for Solid Oxide Fuel Cells: Complex Oxides without Alkaline Earth Metal Elements

Complex magnetic behaviour of Sr2CoNb1−xTixO6(0 ≤ x ≤ 0.5) as a result of a flexible microstructure

The A-cation deficient perovskite series La2−xCoTiO6−δ (0 ≤ x ≤ 0.20): new components for potential SOFC composite cathodes

Contact Info

Product

Resources

About

Complex magnetic behaviour of Sr₂CoNb_1−xTi_xO₆(0 ≤ x ≤ 0.5) as a result of a flexible microstructure

The A-cation deficient perovskite series La_2−xCoTiO_6−δ (0 ≤ x ≤ 0.20): new components for potential SOFC composite cathodes