A Review of RedOx Cycling of Solid Oxide Fuel Cells Anode

Faes, Antonin; Hessler-Wyser, Aïcha; Zryd, A.; herle, Jan Van

doi:10.3390/membranes2030585

Cited by 186 publications

(147 citation statements)

References 198 publications

(357 reference statements)

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“…A number of materials such as Ni/YSZ cermet anodes have become industry standard materials they are well established in the technology and the good electrochemical performance of these Ni based cermets have proved difficult to rival (1). However they do suffer from a number of weaknesses which can limit performance and durability, such redox tolerance, carbon deposition in hydrocarbon fuels and sulphur poisoning, though as they have proved difficult to replace a number of engineering solutions have been developed to work around these limitations but they do add cost and complexity to the system in terms of manufacture, operation and maintenance (2). Therefore materials based solutions which could offer a more robust anode with resistance to the above limitations would be of great advantage in simplifying system design and reducing costs and are still sought.…”

Section: Introductionmentioning

confidence: 99%

Development of Tailored Porous Microstructures for Infiltrated Catalyst Electrodes by Aqueous Tape Casting Methods

et al. 2015

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Recent SOFC research has shown that impregnating fine catalyst structures into porous scaffolds to be an extremely promising route for electrode development. It is clear that in optimising the advantages offered by this technique there will be an obvious link between the morphology of the porous scaffold and the infiltrated catalyst. There are significant potential benefits to using aqueous systems for the manufacture of the scaffold. They include the potential for a far larger range of pore formers which may be employed to create specific pore morphologies and also reduced environmental burdens, such as exhaust handling, worker exposure and disposal. Recent and ongoing activities to develop such systems at University of St Andrews will be described. Areas of discussion will be effects of ceramic particle size, the size ratio of pore former to ceramic particle, pore former type and loading and how these interact with other tape constituents both on the behaviour during processing and on the final fired morphology. Better understanding of these complex relationships will help in designing optimised porous structures in the future.

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Section: Introductionmentioning

confidence: 99%

Development of Tailored Porous Microstructures for Infiltrated Catalyst Electrodes by Aqueous Tape Casting Methods

et al. 2015

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“…The greater volume change noted for the Ni-particles upon re-oxidation than reduction is a phenomenon that has been reported to be undesirable in Ni-YSZ cermets due to expansion of the cermet anode and delamination of the electrolyte/electrode layer and/or potential cracking of the YSZ backbone [32]. Moreover, these effects have been reported to be more prolific in Ni-YSZ anodes of low porosity [28,32].…”

Section: Esem Analysismentioning

confidence: 99%

“…where an initial volume change due to NiO reduction (~40%) is significantly exceeded on subsequent re-oxidation (~66%) due to the so called pseudo Kirkendall effect [32].…”

Section: Esem Analysismentioning

confidence: 99%

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In-situ redox cycling behaviour of Ni–BaZr0.85Y0.15O3−δ cermet anodes for Protonic Ceramic Fuel Cells

Nasani¹,

Willinger²,

Yaremchenko³

et al. 2014

International Journal of Hydrogen Energy

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Abstract:The current work investigates the redox behaviour of peak performing NiBaZr 0.85 Y 0.15 O 3- (Ni-BZY) cermet anodes for protonic ceramic fuel cells (PCFCs) by electrochemical impedance measurements, scanning electron microscopy (SEM) and Xray diffraction (XRD). Peak performing PCFC cermet anodes are documented to require much lower porosity levels than those needed in oxide-ion conducting counterparts. The polarisation behaviour of these optimised PCFC anodes is shown to be drastically impaired by redox cycling, with depletions in performance that correspond to around 80% of the original resistance values noted after the first redox cycle. The ohmic resistance (Rohmic) is also shown to be increased due to delamination at the electrode/electrolyte interface, as confirmed by postmortem microstructural analysis. Insitu measurements by environmental scanning microscopy (ESEM) reveal that degradation proceeds due to volume expansion of the nickel phase during the reoxidation stage of redox cycling. The present study reveals degradation to be very fast for peak performing Ni-BZY cermets of low porosity. Hence, methods to improve redox stability can be considered to be essential before such anodes can be implemented in practical devices.

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“…Gadolinia-doped ceria (GDC) exhibits ionic conductivity higher than yttria-stabilized zirconia (YSZ) at temperatures below 800 °C and therefore present great potential for SOFC electrolytes applications [4,5]. However, the oxygen partial pressure at the interface between anode and electrolyte at 800 °C is between 10 -18 and 10 -20 atm [6]. In these conditions, it occurs the Ce +4 reduction since at 800 °C the equilibrium oxygen partial pressure between Ce 2 O 3 and CeO 2 phases is 2.5x10 -20 atm.…”

Section: Introductionmentioning

confidence: 99%

Electrical and microstructural characterization of Gd-doped Ceria/Y-doped Zirconia bi-layer electrolyte prepared by tape casting

Dias

Souza

2017

Matéria (Rio J.)

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GDC-YSZ bi-layer SOFC electrolytes are an interesting manner to protect GDC electrolytes of the low oxygen partial pressure present at anode-electrolyte interface. This oxygen partial pressure condition and high temperatures during the operation of SOFC permit GDC electrolyte reduction injuring the performance of SOFC. In this work, GDC-YSZ bi-layer electrolytes were prepared using double tape casting technique. Single layers of YSZ and GDC electrolytes were also prepared by the same technique for comparison. All samples were sintered at 1600 °C/2 h in air and analyzed by SEM and impedance spectroscopy technique. A good adhesion was established between the layer GDC and YSZ and no cracks were detected despite the differential firing shrinkage. The electrical conductivity of GDC-YSZ bi-layer sample at 350 °C was 7.98x10 -5 S.cm -1 and for GDC and YSZ single layer samples electrical conductivities were 1.89x10 -4 S.cm -1 and 4.71x10 -5 S.cm -1 , respectively. These results show that GDC-YSZ bi-layer electrolyte is superior to YSZ single layer electrolyte.

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A Review of RedOx Cycling of Solid Oxide Fuel Cells Anode

Cited by 186 publications

References 198 publications

Development of Tailored Porous Microstructures for Infiltrated Catalyst Electrodes by Aqueous Tape Casting Methods

Development of Tailored Porous Microstructures for Infiltrated Catalyst Electrodes by Aqueous Tape Casting Methods

In-situ redox cycling behaviour of Ni–BaZr0.85Y0.15O3−δ cermet anodes for Protonic Ceramic Fuel Cells

Electrical and microstructural characterization of Gd-doped Ceria/Y-doped Zirconia bi-layer electrolyte prepared by tape casting

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