Synthesis and performance of A-site deficient lanthanum-doped strontium titanate by nanoparticle based spray pyrolysis

Burnat, Dariusz; Heel, André; Holzer, Lorenz; Kata, Dariusz; Lis, Jerzy; Graule, Thomas

doi:10.1016/j.jpowsour.2011.10.088

Cited by 58 publications

(55 citation statements)

References 48 publications

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“…12 Such synthesis routes are economically unsuitable, as well as being unsuitable for the production of highly pure and homogeneous materials. In one of the previous studies, the authors have circumvented these problems by a nanoparticle based spray pyrolysis process.…”

Section: Resultsmentioning

confidence: 99%

Smart material concept: reversible microstructural self-regeneration for catalytic applications

et al. 2016

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a This paper presents a proof-of-concept study and demonstrates the next generation of a "smart" catalyst material, applicable to high temperature catalysis and electro-catalysis such as gas processing and as a catalyst for solid oxide cells. A modified citrate-gel technique was developed for the synthesis of La x Sr 1À1.5x Ti 1Ày Ni y O 3Àd . This method allowed the synthesis of single phase materials with a high specific surface area, after the first calcination step at temperatures as low as 650 C. Up to 5 at% of nickel could be incorporated into the perovskite structure at this low calcination temperature. X-ray powder diffraction and microscopy techniques have proven the exsolution of nickel nanoclusters under low oxygen partial pressure. The amount of exsoluted nickel nanoparticles was sensitive to surface finishing, whereby much more exsoluted nanoparticles were observed on pre-treated and polished surfaces as compared to original ones. Increasing A-site deficiency leads to a larger number of nickel particles on the surface, indicating a destabilizing influence of the A-site vacancies on the B-site metal cations.Repetitive redox cycles prove that the nickel exsolution and re-integration is a fully reversible process.These materials working in a cyclic and repetitive way may overcome the drawbacks of currently used conventional catalysts used for high temperature systems and overcome major degradation issues related to catalyst poisoning and coarsening-induced aging.

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Section: Resultsmentioning

confidence: 99%

Smart material concept: reversible microstructural self-regeneration for catalytic applications

et al. 2016

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“…Titanate powders of various stoichiometries were prepared according to the previously reported synthesis technique [13]. In order to use particles with a similar particle size, the specific surface area (SSA) of powders used in this study was tailored to the value of about 12.5 m 2 g À1 by planetary milling.…”

Section: Methodsmentioning

confidence: 99%

“…The latter described effect dominates, since reduced LST 27 expands the lattice with high temperature reduction [13]. As a consequence, the lower mobility of Ti ions reduces the flux of Ti towards the electrolyte.…”

Section: Critical Onset Temperature Under Oxidizing and Reducing Condmentioning

confidence: 99%

“…A very promising modification of those compounds regarding the material performance is represented by the group of A-site deficient La doped strontium titanates (LST), which show better electronic properties and excellent mechanical robustness during redox cycling [9e12]. For instance A-site deficient doped Sr titanates fired under reducing conditions can easily fulfil the electronic conductivity needed for anode materials [13]. Durability of SOFC components is nowadays a primary criterion within SOFC research programs.…”

Section: Introductionmentioning

confidence: 99%

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On the chemical interaction of nanoscale lanthanum doped strontium titanates with common scandium and yttrium stabilized electrolyte materials

Burnat

Heel

Holzer

et al. 2012

International Journal of Hydrogen Energy

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“…[ 291 ] The conductivity behavior of Sr 1−3 x /2 La x TiO 3 ( x = 0.2, La 0.2 Sr 0.7 TiO 3 ) was similar to La 0.4 Sr 0.4 TiO 3 . La 0.2 Sr 0.7 TiO 3 was however of limited phase stability at temperatures above 1290 ° C. [ 292 ] From the defect chemistry viewpoint LST can be treated as a family of layered perovskites with the general formula La 2 Sr n −2 Ti n O 3 n + 1 . [ 293 ] La 2 Sr n −2 Ti n O 3 n + 1 have the ability to accommodate excess oxygen anions among the primitive perovskite lattice.…”

Section: Titanatementioning

confidence: 99%

Solid Oxide Fuel Cell Anode Materials for Direct Hydrocarbon Utilization

Chan

Liu

et al. 2012

Advanced Energy Materials

278

159

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Solid oxide fuel cells (SOFC) are highly efficient energy conversion devices with the advantage of directly utilizing hydrocarbon fuels. Starting with a short introduction about the fuel challenges and early achievements in this field, this review paper focuses on advances in oxygen‐ion conducting electrolyte‐based SOFC during the last 15 years. Robust anodes immune to carbon deposition are a prerequisite for direct hydrocarbon SOFC. In this paper, direct hydrocarbon SOFC anode materials are classified into three general categories: Ni‐cermet, Cu‐cermet, and oxide‐based anodes. Oxide anodes are further classified in terms of their crystalline structures, namely fluorite, rutile, tungsten bronze, pyrochlore, perovskite, and double perovskite. Achievements and recent advances on these SOFC anodes are reviewed and discussed. The concluding remarks summarize the pros and cons of direct hydrocarbon SOFC anode materials along with the perspective of future research trends.

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Synthesis and performance of A-site deficient lanthanum-doped strontium titanate by nanoparticle based spray pyrolysis

Cited by 58 publications

References 48 publications

Smart material concept: reversible microstructural self-regeneration for catalytic applications

Smart material concept: reversible microstructural self-regeneration for catalytic applications

On the chemical interaction of nanoscale lanthanum doped strontium titanates with common scandium and yttrium stabilized electrolyte materials

Solid Oxide Fuel Cell Anode Materials for Direct Hydrocarbon Utilization

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