On the Existence of A‐Site Deficiency in Perovskites and Its Relation to the Electrochemical Performance

Konysheva, Elena Yu.; Xu, Xiaoxiang; Irvine, John T. S.

doi:10.1002/adma.201103352

Cited by 90 publications

(73 citation statements)

References 28 publications

(47 reference statements)

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“…The energy value can be calculated from the enthalpy of formation of metal oxides, the sublimation energy of metal and the oxygen dissociation of the original oxides [36][37][38]. Moreover, ABE can be also used as a predictor to estimate the extent of A-site deficiency in perovskites [39]. The results of our calculations for ABE of SrNb 0.1 Co 0.9−x Fe x O 3−ı perovskites are plotted in Fig.…”

Section: Resultsmentioning

confidence: 99%

Probing CO2 reaction mechanisms and effects on the SrNb0.1Co0.9−xFexO3−δ cathodes for solid oxide fuel cells

Zhu

Sunarso

Zhou

2015

Applied Catalysis B: Environmental

101

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Section: Resultsmentioning

confidence: 99%

Probing CO2 reaction mechanisms and effects on the SrNb0.1Co0.9−xFexO3−δ cathodes for solid oxide fuel cells

Zhu

Sunarso

Zhou

2015

Applied Catalysis B: Environmental

101

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“…[ 215 ] More recently, Konysheva wileyonlinelibrary.com neutron powder diffraction, high-resolution TEM and TGA to investigate the nominal A-site defi cient LNF64 samples. [ 231,232 ] They confi rmed that the nominal A-site defi cient LNF64 was actually much closer to a stoichiometric LNF. The LNF with a high fraction of Ni on its B-site had an average B-O bonding energy close to 170 kJ mol −1 .…”

Section: Perovskite-type Metal Oxidesmentioning

confidence: 97%

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

243

154

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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.

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“…The generality of the concept can be further refined by tuning the particle nucleation/growth balance through prudent adjustment of driving forces of 'intrinsic' nature (defect type and concentration, cation composition) or 'extrinsic' nature (pO 2 , temperature, atmosphere). The concept may be extended to other perovskites since A-site vacancies can be accommodated in various concentrations and for a wide variety of B-site cations [34][35][36][37][38][39][40][41][42][43] , and, potentially transferred to other oxide systems.…”

Section: Perspectives and Implications Of The Phenomenonmentioning

confidence: 99%

In situ growth of nanoparticles through control of non-stoichiometry

et al. 2013

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Surfaces decorated with uniformly dispersed catalytically active nanoparticles play a key role in many fields, including renewable energy and catalysis. Typically, these structures are prepared by deposition techniques, but alternatively they could be made by growing the nanoparticles in situ directly from the (porous) backbone support. Here we demonstrate that growing nano-size phases from perovskites can be controlled through judicious choice of composition, particularly by tuning deviations from the ideal ABO 3 stoichiometry. This non-stoichiometry facilitates a change in equilibrium position to make particle exsolution much more dynamic, enabling the preparation of compositionally diverse nanoparticles (that is, metallic, oxides or mixtures) and seems to afford unprecedented control over particle size, distribution and surface anchorage. The phenomenon is also shown to be influenced strongly by surface reorganization characteristics. The concept exemplified here may serve in the design and development of more sophisticated oxide materials with advanced functionality across a range of possible domains of application. AbstractSurfaces decorated with uniformly dispersed catalytically active nanoparticles play a key role in many fields including renewable energy and catalysis. These structures are typically prepared by deposition techniques, but alternatively they could be made by growing the nanoparticles in situ directly from the (porous) backbone support. Here we demonstrate that growing nano-size phases from perovskites can be controlled through judicious choice of composition, particularly by tuning deviations from the ideal ABO 3 stoichiometry. This nonstoichiometry facilitates a change in equilibrium position to make particle exsolution much more dynamic, enabling the preparation of compositionally diverse nanoparticles (i.e. metallic, oxides, or mixtures) and seems to afford unprecedented control over particle size, distribution and surface anchorage. The phenomenon is also shown to be strongly influenced 2 by surface reorganisation characteristics. The concept exemplified here may serve in the design and development of more sophisticated oxide materials with advanced functionality across a range of possible domains of application.

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On the Existence of A‐Site Deficiency in Perovskites and Its Relation to the Electrochemical Performance

Cited by 90 publications

References 28 publications

Probing CO2 reaction mechanisms and effects on the SrNb0.1Co0.9−xFexO3−δ cathodes for solid oxide fuel cells

Probing CO2 reaction mechanisms and effects on the SrNb0.1Co0.9−xFexO3−δ cathodes for solid oxide fuel cells

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

In situ growth of nanoparticles through control of non-stoichiometry

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