Direct Applicability of La0.6Sr0.4CoO3 – δ Thin Film Cathode to Yttria Stabilised Zirconia Electrolytes at T ≤ 650 °C

Noh, Ho Sung; Son, Ji‐Won; Lee, H.; Park, J.-S.; Lee, H.-W.; Lee, J.-H.

doi:10.1002/fuce.201000009

Cited by 45 publications

(43 citation statements)

References 29 publications

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“…However, LSC is incompatible with yttriastabilized zirconia (YSZ) traditionally used for SOFC electrolytes, as strontium from the cathode reacts with zirconium from the electrolyte to form SrZrO 3 which has a low ionic conductivity [4,5,6] and therefore a detrimental effect on cell performance. This reaction is known to take place during sintering at temperatures above 1000 °C [7] but has also been observed at intermediate temperatures down to 650 °C [5,8]. To avoid this reaction a gadolinia-doped ceria (GDC) barrier can be applied between electrolyte and cathode.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Magnetron sputtered gadolinia-doped ceria diffusion barriers for metal-supported solid oxide fuel cells

Sønderby

Klemensø

Christensen

et al. 2014

Journal of Power Sources

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Gadolinia-doped ceria (GDC) thin films are deposited by reactive magnetron sputtering in an industrial-scale setup and implemented as barrier layers between the cathode and electrolyte in metal-based solid oxide fuel cells consisting of a metal support, an electrolyte of ZrO 2 co-doped with Sc 2 O 3 and Y 2 O 3 (ScYSZ) and a Sr-doped lanthanum cobalt oxide cathode. In order to optimize the deposition of GDC to obtain high electrochemical performance of the cells, the influence of film thickness and adatom mobility is studied. The adatom mobility is varied by tuning the deposition temperature and substrate bias voltage.A GDC layer thickness of 0.6 µm is found to effectively block Sr diffusion when bias voltage and deposition temperature is tuned to promote dense coatings. The adatom mobility has a large influence on the film density. Low temperature and bias voltage result in underdense column boundaries which function as channels for Sr to diffuse to the GDC-ScYSZ interface. By tuning deposition temperature, bias voltage and film thickness area specific resistances down to 0.34 Ωcm 2 are achieved at cell tests performed at an operating temperature of 650 °C.

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Section: Accepted Manuscriptmentioning

confidence: 99%

Magnetron sputtered gadolinia-doped ceria diffusion barriers for metal-supported solid oxide fuel cells

Sønderby

Klemensø

Christensen

et al. 2014

Journal of Power Sources

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“…NiO-YSZ anodes were uni-axially pressed, and NiO-YSZ functional layer and 8YSZ electrolyte were screen-printed and co-fired at 1400 C as described previously [16,27]. On such 2 cm 2 cm substrates with an 8YSZ electrolyte thickness of »6 lm, GDC buffer layers were deposited by AA-CVD at 450 C.…”

Section: Cell Characterizationmentioning

confidence: 99%

“…The preparation of thin and dense GDC layers by conventional powder processing is extremely challenging, especially over porous and rough anode substrates [8,11,13]. Therefore, thin film deposition techniques like sputtering [14] and pulsed laser deposition [10,15,16] are frequently applied. However, these techniques require elaborate apparatuses and high vacuum, which poses constraints on cost-effective production and up-scalability.…”

Section: Introductionmentioning

confidence: 99%

“…The Ce 0.8 Gd 0.2 O 2±d thin films are then used to form bi-layers with YSZ prepared by the same technique [24], and cross-plane conductivities of single and bi-layers are determined. Finally, the AA-CVD GDC layers are integrated into anode supported solid oxide fuel cells with yttria-stabilized zirconia electrolyte [15,16], and their suitability as diffusion barrier between La 0.6 Sr 0.4 CoO 3±d cathode and YSZ electrolyte is assessed.…”

Section: Introductionmentioning

confidence: 99%

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Gadolinia Doped Ceria Thin Films Prepared by Aerosol Assisted Chemical Vapor Deposition and Applications in Intermediate‐Temperature Solid Oxide Fuel Cells

et al. 2013

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Furthermore, deposition at such low temperatures is promising for processing of thin film assemblies.The preparation of bi‐layer electrolytes of yttria stabilized zirconia and gadolinia doped ceria thin films by aerosol assisted chemical vapor deposition is demonstrated. Gadolinia doped ceria films as thin as 150 nm are applied as barrier layers between yttria stabilized zirconia electrolyte and La0.6Sr0.4CoO3–δ cathode in anode supported solid oxide fuel cells. High power densities above 850 mW cm–2 at 650 °C are only obtained with these barrier layers, indicating that the GDC thin films effectively inhibit the formation of unwanted interface reactions.

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“…Many studies have recently focused on the fabrication of single thin films and on their characterization for SOFC application, such as those reported in ref. [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. For the application, three thin films, i.e.…”

Section: Introductionmentioning

confidence: 99%

Syngas generation from n-butane with an integrated MEMS assembly for gas processing in micro-solid oxide fuel cell systems

et al. 2012

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An integrated system of a microreformer and a carrier allowing for syngas generation from liquefied petroleum gas (LPG) for micro-SOFC application is discussed. The microreformer with an overall size of 12.7 mm 6 12.7 mm 6 1.9 mm is fabricated with micro-electro-mechanical system (MEMS) technologies. As a catalyst, a special foam-like material made from ceria-zirconia nanoparticles doped with rhodium is used to fill the reformer cavity of 58.5 mm 3 . The microreformer is fixed onto a microfabricated structure with built-in fluidic channels and integrated heaters, the so-called functional carrier. It allows for thermal decoupling of the cold inlet gas and the hot fuel processing zone. Two methods for heating the microreformer are compared in this study: a) heating in an external furnace and b) heating with the two built-in heaters on the functional carrier. With both methods, high butane conversion rates of 74%-85% are obtained at around 550 uC. In addition, high hydrogen and carbon monoxide yields and selectivities are achieved. The results confirm those from classical lab reformers built without MEMS technology (N. Hotz et al., Chem. Eng. Sci., 2008, 63, 5193; N. Hotz et al., Appl. Catal., B, 2007, 73, 336). The material combinations and processing techniques enable syngas production with the present MEMS based microreformer with high performance for temperatures up to 700 uC. The functional carrier is the basis for a new platform, which can integrate the micro-SOFC membranes and the gas processing unit as subsystem of an entire micro-SOFC system.

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Direct Applicability of La_0.6Sr_0.4CoO_3 – δ Thin Film Cathode to Yttria Stabilised Zirconia Electrolytes at T ≤ 650 °C

Cited by 45 publications

References 29 publications

Magnetron sputtered gadolinia-doped ceria diffusion barriers for metal-supported solid oxide fuel cells

Magnetron sputtered gadolinia-doped ceria diffusion barriers for metal-supported solid oxide fuel cells

Gadolinia Doped Ceria Thin Films Prepared by Aerosol Assisted Chemical Vapor Deposition and Applications in Intermediate‐Temperature Solid Oxide Fuel Cells

Syngas generation from n-butane with an integrated MEMS assembly for gas processing in micro-solid oxide fuel cell systems

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