Evolution of conductivity, structure and thermochemical stability of lanthanum manganese iron nickelate perovskites

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

doi:10.1039/b807145d

Cited by 25 publications

(38 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These tendencies are disrupted when the structure distorts from cubic to orthorhombic at high Sr contents where activity decreases. The materials is stable against photocatalytic degradation and reaction with water at ambient temperatures, which might not be expected 35 for such a low Nb oxidation state material. Absorption of light by interband transitions in a strongly coloured metallic oxide is not surprising; however, that this light can yield excitations able to drive photocatalytic reactions is surprising as recombination would be expected to dominate.…”

Section: Discussionmentioning

confidence: 90%

“…As can be seen from the H 2 production rate of the different samples (Fig. 5), the photocatalytic activity changes 35 with Sr content. In particular it seems to increase for x= 0.…”

mentioning

confidence: 76%

“…Unfortunately, very few materials have been found to be able to carry out the whole water splitting procedure and even less can do that under visible, instead of UV, light 2,3 . Successful 35 water splitting under visible light is often achieved by the production of a Z-scheme [4][5][6][7][8] , which is a system consisting of two photocatalysts, connected by a redox couple (e.g. Fe 3+ / Fe 2+ ), one photocatalyst produces H 2 and the other produces O 2 .…”

mentioning

confidence: 99%

“…The temperature coefficient of resistance was calculated to be α t = 2.05 x 10-4 K -1 . 35 Thus, the material is a red metallic oxide.…”

mentioning

confidence: 99%

See 3 more Smart Citations

An investigation of crystal structure, surface area and surface chemistry of strontium niobate and their influence on photocatalytic performance

Efstathiou

Ménard

et al. 2013

Dalton Trans.

Self Cite

View full text Add to dashboard Cite

Sr 1-x NbO 3 is an unusual material that displays both metallic type conduction and photocatalytic activity, despite it being a NbIV oxide, it sustains photo-oxidation without degradation.1 The influence of crystal structure, surface area and surface chemistry on the photocatalytic activity of strontium niobate 15 has been investigated. The crystal structure of strontium niobate depends on the Sr content of the A site, with cubic symmetry for Sr ≤ 0.92 and orthorhombic symmetric for 0.92 ˂ Sr ≤ 0.97. The change of crystal structure from cubic to orthorhombic symmetry seems to have a negative effect on the photocatalytic activity, as the NbO 6 octahedra become distorted and unfavourable for d-orbital overlapping. The photocatalytic activity increased significantly by enlarging the surface area through ball 20 milling, nevertheless, a clear trend for surface area effect on activity is not obtained among samples with different Sr content. An enrichment of Sr on the surface of strontium niobate was observed by XPS, which seems to be a governing factor improving stability.

show abstract

Section: Discussionmentioning

confidence: 90%

“…As can be seen from the H 2 production rate of the different samples (Fig. 5), the photocatalytic activity changes 35 with Sr content. In particular it seems to increase for x= 0.…”

mentioning

confidence: 76%

mentioning

confidence: 99%

“…The temperature coefficient of resistance was calculated to be α t = 2.05 x 10-4 K -1 . 35 Thus, the material is a red metallic oxide.…”

mentioning

confidence: 99%

See 2 more Smart Citations

An investigation of crystal structure, surface area and surface chemistry of strontium niobate and their influence on photocatalytic performance

Efstathiou

Ménard

et al. 2013

Dalton Trans.

Self Cite

View full text Add to dashboard Cite

show abstract

“…[221][222][223][224] For instance, it was reported that the oxygen nonstoichiometry in a LaNi 0.3 Fe 0.7 O 3-δ material did not exceed 0.025 at 1100 °C under oxygen partial pressure as low as 10 −3 atm. [ 224 ] Bevilacqua et al performed X-ray absorption near edge spectroscopy and extended X-ray absorption fi ne structure analyses on LNF64 material.…”

Section: Perovskite-type Metal Oxidesmentioning

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

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

Konysheva

Irvine

2011

Advanced Materials

Self Cite

View full text Add to dashboard Cite

The low range of A-site deficiency in perovskite structures with Ni cations was verified by neutron powder diffraction, transmission electron microscopy, and thermogravimetric analysis. A thermodynamic approach has been utilized, for the first time, to predict the extent of A-site deficiencies within the perovskite structure, introducing simple prediction criteria that could be adopted for designing advanced materials.

show abstract

Evolution of conductivity, structure and thermochemical stability of lanthanum manganese iron nickelate perovskites

Cited by 25 publications

References 29 publications

An investigation of crystal structure, surface area and surface chemistry of strontium niobate and their influence on photocatalytic performance

An investigation of crystal structure, surface area and surface chemistry of strontium niobate and their influence on photocatalytic performance

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

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

Contact Info

Product

Resources

About