An experimental investigation into micro-fabricated solid oxide fuel cells with ultra-thin La0.6Sr0.4Co0.8Fe0.2O3 cathodes and yttria-doped zirconia electrolyte films

Johnson, A. C.; Lai, Bo‐Kuai; Xiong, Hui; Ramanathan, Shriram

doi:10.1016/j.jpowsour.2008.10.021

Cited by 80 publications

(61 citation statements)

References 24 publications

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“…The ASR dependence on temperature follows an Arrhenius-type law for both the YSZ and the LSC, with activation energies of E a =1.05(1) eV and E a =1.54(4) eV, respectively. These values are in concordance with previously reported values for the corresponding bulk materials (see [31,54,[56][57][58] for YSZ and [21,22,24,42] for LSC).…”

Section: Accepted Manuscriptsupporting

confidence: 93%

“…Indeed, some attempts have been already reported on the development of pure oxide-based electrodes for fabricating fully-ceramic µSOFC, based on state-of-the-art materials on bulk SOFC systems working as cathodes [19][20][21][22][23][24][25][26][27] or anodes [28]. However, only few results have been reported on µSOFC performance using ceramic electrodes [29][30][31][32]. [33][34][35]) together with the large mismatch in the thermal expansion coefficient of LSC vs. YSZ (TEC LSC = 23 ppm/K; TEC YSZ = 11 ppm/K [36][37][38]) limit its applicability at high operating temperatures or in devices involving high T fabrication steps (T>700ºC).…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

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Porous La0.6Sr0.4CoO3−δ thin film cathodes for large area micro solid oxide fuel cell power generators

Garbayo

Esposito

Sanna

et al. 2014

Journal of Power Sources

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Section: Accepted Manuscriptsupporting

confidence: 93%

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

Porous La0.6Sr0.4CoO3−δ thin film cathodes for large area micro solid oxide fuel cell power generators

Garbayo

Esposito

Sanna

et al. 2014

Journal of Power Sources

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“…The upper part of Figure 3 shows the typical evolution of a sputtering deposited Pt thin film after annealing at 750ºC for different time. This degradation mechanism is particularly important in μSOFCs, because it can cause the loss of electric contact between the electrolyte membrane and the silicon substrate, determining the failure of the device 44 . Moreover, the use of a pure electronic conductor as electrode in a μSOFC can generate electrical constrains in the nanometric thin film electrolyte.…”

Section: The Electrodesmentioning

confidence: 99%

“…The high interest in obtaining high cathode performance is because the Oxygen reduction reactions (ORR) is one of the more limiting processes in the overall behaviour of a SOFC, especially at intermediate temperatures. 44,49 . In their work, they measured a complete μSOFC with LSCF as cathode and Pt as anode, founding a maximum power of 60mW/cm 2 at 500ºC.…”

Section: The Electrodesmentioning

confidence: 99%

Micro solid oxide fuel cells: a new generation of micro-power sources for portable applications

et al. 2017

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Portable electronic devices are already an indispensable part of our daily life; and their increasing number and demand for higher performance is becoming a challenge for the research community. In particular, a major concern is the way to efficiently power these energy-demanding devices, assuring long grid independency with high efficiency, sustainability and cheap production. In this context, technologies beyond Li-ion are receiving increasing attention, among which the development of micro solid oxide fuel cells (μSOFC) stands out. In particular, μSOFC provides a high energy density, high efficiency and opens the possibility to the use of different fuels, such as hydrocarbons. Yet, its high operating temperature has typically hindered its application as miniaturized portable device. Recent advances have however set a completely new range of lower operating temperatures, i.e. 350-450ºC, as compared to the typical >900ºC needed for classical bulk SOFC systems. In this work, a comprehensive review of the status of the technology is presented. The main achievements, as well as the most important challenges still pending are discussed, regarding (i.) the cell design and microfabrication, and (ii.) the integration of functional electrolyte and electrode materials. To conclude, the different strategies foreseen for a wide deployment of the technology as new portable power source are underlined.

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“…By taking advantage of well-established thin film deposition and microfabrication techniques used in semiconductor device processing, they may be mass-produced at low cost. Therefore, it is essential to be able to integrate multilayer, functional oxide membranes onto wafers, such as silicon (Si) [4][5][6][7][8] or Foturan [9], and operate them at low temperatures with adequate power output. Besides their applications in lSOFCs, functional ionic and mixed ionic and electronic conducting oxide membranes are also of technological importance in oxygen pumps [10], oxygen separation [10,11] and as catalysts for oxidation of hydrocarbons [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Microfabrication Considerations for Self‐Supported On‐Chip Ultra‐Thin Micro‐Solid Oxide Fuel Cell Membranes

et al. 2009

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La0.6Sr0.4Co0.8Fe0.2O3 – δ (LSCF) has been sputtered on bare Si and Si3N4 and yttria‐stabilised zirconia (YSZ) thin films to investigate annealing temperature‐ and thickness‐dependent microstructure and functional properties, as well as their implications for designing failure‐resistant micro‐solid oxide fuel cell (μSOFC) membranes. The LSCF thin films crystallise in the 400–450 °C range; however, after annealing in the 600–700 °C range, cracks are observed. The formation of cracks is also thickness‐dependent. High electrical conductivity, ∼520 Scm–1 at 600 °C, and low activation energy, ∼0.13 eV, in the 400–600 °C range, are still maintained for LSCF films as thin as 27 nm. Based on these studies, a strong correlation between microstructure and electrical conductivity has been observed and an annealing temperature‐thickness design space that is complementary to temperature‐stress design space has been proposed for designing reliable membranes using sputtered LSCF thin films. Microfabrication approaches that maintain the highest possible surface and interface quality of heterostructured membranes have been carefully examined. By taking advantage of the microstructure, microfabrication and geometrical structural considerations, we were able to successfully fabricate large‐area, self‐supported membranes. These results are also relevant to conventional or grid‐supported SOFC membranes using ultrathin nanocrystalline cathodes and μSOFCs using cathode thin films other than LSCF.

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An experimental investigation into micro-fabricated solid oxide fuel cells with ultra-thin La0.6Sr0.4Co0.8Fe0.2O3 cathodes and yttria-doped zirconia electrolyte films

Cited by 80 publications

References 24 publications

Porous La0.6Sr0.4CoO3−δ thin film cathodes for large area micro solid oxide fuel cell power generators

Porous La0.6Sr0.4CoO3−δ thin film cathodes for large area micro solid oxide fuel cell power generators

Micro solid oxide fuel cells: a new generation of micro-power sources for portable applications

Microstructure and Microfabrication Considerations for Self‐Supported On‐Chip Ultra‐Thin Micro‐Solid Oxide Fuel Cell Membranes

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