Laser sintering of perovskite-oxide and metal coatings by the sol gel process

Zergioti, I.; Laat, A.W.M. de; Guntow, Uwe; Hutter, Frank; Maerten, O.

doi:10.1007/s003390051432

Cited by 11 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Apart from the conventional methods of cathode preparation, including high temperature calcination, mechanical grinding of powders, screen printing and sintering of thick film layers, alternative synthesis and deposition routes are available. Nanocrystalline LSC or La 1‐x Sr x Co 1‐y Fe y O 3‐δ thin films on electrolyte substrates were already fabricated by pulsed laser deposition,6–9 DC, and RF sputtering,10, 11 spray pyrolysis,12 and sol‐gel deposition 13–17…”

Section: Introductionmentioning

confidence: 99%

Microstructure of Nanoscaled La_0.6Sr_0.4CoO_3‐δ Cathodes for Intermediate‐Temperature Solid Oxide Fuel Cells

Dieterle

Bockstaller

Gerthsen

et al. 2011

Advanced Energy Materials

View full text Add to dashboard Cite

Numerous preparation techniques for perovskite-based MIEC materials have been developed over the last years. Apart from the conventional methods of cathode preparation, including high temperature calcination, mechanical grinding of powders, screen printing and sintering of thick fi lm layers, alternative synthesis and deposition routes are available. Nanocrystalline LSC or La 1−x Sr x Co 1−y Fe y O 3− δ thin fi lms on electrolyte substrates were already fabricated by pulsed laser deposition, [6][7][8][9] DC, and RF sputtering, [ 10,11 ] spray pyrolysis, [ 12 ] and sol-gel deposition. [13][14][15][16][17] In this work the chemical and structural properties and the stability of nanoscaled La 0.6 Sr 0.4 CoO 3− δ LSC thin fi lm cathodes on polycrystalline Gd 0.1 Ce 0.9 O 1.95 (CGO) substrates were investigated thoroughly. The fabrication by a low-temperature sol-gel technique is favorable for tailoring the grain size, porosity and cathode-fi lm thickness. [ 18 ] The electrochemical properties of the nanoscaled LSC thin fi lm cathodes were already reported by Hayd et al. who presented an outstanding electrochemical performance and extraordinary low area specifi c resistances as low as ASR chem = 0.023 Ω cm 2 at an operating temperature of 600 ° C. [ 19,20 ] Interestingly enough, theoretical models predicted ASR chem values up to one order of magnitude larger than the experimental data. For obvious reasons, the excellent performance of our nanoscaled cathodes does not solely depend on microstructure (porosity, increased inner surface area) as reported in previous work, [ 21 ] but presumably on the enhanced catalytic properties of the La 0.6 Sr 0.4 CoO 3− δ . However, the outstanding electrochemical performance motivates the analysis of the microstructure and phase composition of the LSC cathodes presented in this work.The nanoscaled LSC thin-fi lm cathodes were studied by transmission and scanning transmission electron microscopy (TEM/STEM) combined with energy-dispersive X-ray spectroscopy (EDXS). Moreover, high-angle annular dark-fi eld (HAADF) STEM tomography was used to study the distribution of the pores and quantify the porosity, which was not reported for nanoscaled (La,Sr)CoO 3 -based materials in literature before. Although several techniques like μ -tomography, [ 22 ] FIB-tomography, [ 23,24 ] transmission X-ray microscope based X-ray tomography, [ 12 , 25 ] mercury intrusion, [ 22 , 26 ] nitrogen adsorption, [ 27 ] or the Archimedes method [ 22 , 28 ]

show abstract

Section: Introductionmentioning

confidence: 99%

Microstructure of Nanoscaled La_0.6Sr_0.4CoO_3‐δ Cathodes for Intermediate‐Temperature Solid Oxide Fuel Cells

Dieterle

Bockstaller

Gerthsen

et al. 2011

Advanced Energy Materials

View full text Add to dashboard Cite

show abstract

“…The deposition process using chemical precursors from solution allows the manufacture of high quality, large-area ceramic coatings at low investment cost. Thin films with a broad variety of chemical compositions such as TiO 2 , 6 ZrO 2 , 7 PbZr 53 Ti 47 O 3 , 8 La 12x Sr x CoO 3 9 and ZnO 10 can be prepared. For convenient industrial processing the use of soluble precursor powders for sol preparation has proven advantageous.…”

Section: Introductionmentioning

confidence: 99%

Preparation of TiO2 thin films on polystyrene by liquid phase deposition

Dutschke¹,

Diegelmann²,

Löbmann³

2003

J. Mater. Chem.

View full text Add to dashboard Cite

Polystyrene (PS) substrates were functionalized by wet chemical grafting with 2-acrylamido-2-methylpropane-1sulfonic acid (AMPS). Subsequently, TiO 2 thin films were prepared by liquid phase deposition (LPD) with an average growth rate of 85 nm h 21 ; a maximum thickness of 750 nm was observed in our experiments. The crystalline fraction of the precipitated material was estimated to be 58% by X-ray powder-diffraction. Significantly improved film adhesion was achieved on grafted substrates, as compared to non-functionalized polymers, due to the formation of a thin, coherent primer layer in the early stages of mineralization.

show abstract

“…7 The potential of thin-film synthesis techniques for LSCF cathodes and ceria-based electrolytes actually was demonstrated in the 1990s. [9][10][11] Suitability of processing techniques for high-quality thin films has been reviewed by Will et al 12 In general, lowtemperature processing techniques facilitate a variation in grain size ͑and pore size͒ down to the nanometer scale. In this study, LSC thin-film cathodes have been produced by metallorganic deposition ͑MOD͒ with processing temperatures below the crystallization temperature of the interface reaction between LSC and YSZ.…”

mentioning

confidence: 99%

Nanoscaled (La[sub 0.5]Sr[sub 0.5])CoO[sub 3−δ] Thin Film Cathodes for SOFC Application at 500°C<T<700°C

Peters

Weber

Ivers‐Tiffée

2008

J. Electrochem. Soc.

122

140

View full text Add to dashboard Cite

Nanoscaled and nanoporous ͑La 0.5 Sr 0.5 ͒CoO 3−␦ ͑LSC͒ thin film cathodes ͑film thickness ranging from 200 to 300 nm, grain and pore size in the range of 50 nm͒ were electrochemically characterized to determine their potential for intermediate and lowtemperature solid oxide fuel cells ͑SOFCs͒. Chemically homogeneous, large area ͑25 cm 2 ͒, and nanoporous LSC thin films were derived from metallorganic precursors ͑metallorganic deposition͒ and deposited on yttria-doped zirconia ͓͑YSZ͒ "design 1"͔ and gadolinia-doped ceria ͓͑GCO͒ "design 2"͔. The area-specific polarization resistance ͑ASR pol ͒ of both designs was evaluated on symmetrical cells with special emphasis on constancy, depending on temperature ͑500-850°C͒ and time by means of electrochemical impedance spectroscopy. For both designs, we report the capability of low polarization resistances, e.g., at 600°C, 146 m⍀ cm 2 ͑LSC/YSZ͒, respectively, 130 m⍀ cm 2 ͑LSC/GCO͒. Oxygen reduction reaction was facilitated by a substantial inner surface area of the porous thin-film cathode, as suggested by the application of Adler's model. Nanoporous LSC thin-film cathodes from this study were compared to alternative design concepts for high-performance porous cathodes and with dense ͑La 0.52 Sr 0.48 ͒͑Co 0.18 Fe 0.82 ͒O 3−␦ thin-film cathodes. Furthermore, the aim of our study was ͑i͒ to find a temperature regime with a perspective for chemical durability of an LSC/YSZ interface. We could prove that at a temperature of 500°C and for 100 h, polarization resistance of the LSC/YSZ interface remains constant, and at unreported low values, which reopens LSC/YSZ for micro-SOFC application; ͑ii͒ to estimate the structural durability of nanoscaled and nanoporous LSC thin-film cathodes. We have been able to demonstrate stable and unreported low polarization resistance for LSC/GCO in the temperature range between 500 and 700°C, which is of technical interest for auxiliary-power-unit application.

show abstract

Laser sintering of perovskite-oxide and metal coatings by the sol gel process

Cited by 11 publications

References 0 publications

Microstructure of Nanoscaled La_0.6Sr_0.4CoO_3‐δ Cathodes for Intermediate‐Temperature Solid Oxide Fuel Cells

Microstructure of Nanoscaled La_0.6Sr_0.4CoO_3‐δ Cathodes for Intermediate‐Temperature Solid Oxide Fuel Cells

Preparation of TiO2 thin films on polystyrene by liquid phase deposition

Nanoscaled (La[sub 0.5]Sr[sub 0.5])CoO[sub 3−δ] Thin Film Cathodes for SOFC Application at 500°C<T<700°C

Contact Info

Product

Resources

About

Laser sintering of perovskite-oxide and metal coatings by the sol gel process

Cited by 11 publications

References 0 publications

Microstructure of Nanoscaled La0.6Sr0.4CoO3‐δ Cathodes for Intermediate‐Temperature Solid Oxide Fuel Cells

Microstructure of Nanoscaled La0.6Sr0.4CoO3‐δ Cathodes for Intermediate‐Temperature Solid Oxide Fuel Cells

Preparation of TiO2 thin films on polystyrene by liquid phase deposition

Nanoscaled (La[sub 0.5]Sr[sub 0.5])CoO[sub 3−δ] Thin Film Cathodes for SOFC Application at 500°C<T<700°C

Contact Info

Product

Resources

About

Microstructure of Nanoscaled La_0.6Sr_0.4CoO_3‐δ Cathodes for Intermediate‐Temperature Solid Oxide Fuel Cells

Microstructure of Nanoscaled La_0.6Sr_0.4CoO_3‐δ Cathodes for Intermediate‐Temperature Solid Oxide Fuel Cells