Comparison of the performances of single cell solid oxide fuel cell stacks with Ni/8YSZ and Ni/10CGO anodes with H2S containing fuel

Schubert, Sena Kavurucu; Kusnezoff, Mihails; Michaelis, Alexander; Бредихин, С. И.

doi:10.1016/j.jpowsour.2012.06.020

Cited by 48 publications

(52 citation statements)

References 33 publications

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“…The CGO surface is probably strongly involved in the electrochemical process and even substitutes Ni active sites, reducing their function to a collection of electrons generated by electrochemical reactions from the CGO catalyst. This assumption is also supported by the observation of a better sulphur tolerance of new Ni/CGO anodes by Kavurucu-Schubert [12] which could be only explained by ceria surface involvement into hydrogen oxidation.…”

Section: Resultsmentioning

confidence: 58%

Influence of Electrode Design and Contacting Layers on Performance of Electrolyte Supported SOFC/SOEC Single Cells

et al. 2016

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The solid oxide cell is a basis for highly efficient and reversible electrochemical energy conversion. A single cell based on a planar electrolyte substrate as support (ESC) is often utilized for SOFC/SOEC stack manufacturing and fulfills necessary requirements for application in small, medium and large scale fuel cell and electrolysis systems. Thickness of the electrolyte substrate, and its ionic conductivity limits the power density of the ESC. To improve the performance of this cell type in SOFC/SOEC mode, alternative fuel electrodes, on the basis of Ni/CGO as well as electrolytes with reduced thickness, have been applied. Furthermore, different interlayers on the air side have been tested to avoid the electrode delamination and to reduce the cell degradation in electrolysis mode. Finally, the influence of the contacting layer on cell performance, especially for cells with an ultrathin electrolyte and thin electrode layers, has been investigated. It has been found that Ni/CGO outperform traditional Ni/8YSZ electrodes and the introduction of a ScSZ interlayer substantially reduces the degradation rate of ESC in electrolysis mode. Furthermore, it was demonstrated that, for thin electrodes, the application of contacting layers with good conductivity and adhesion to current collectors improves performance significantly.

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Section: Resultsmentioning

confidence: 58%

Influence of Electrode Design and Contacting Layers on Performance of Electrolyte Supported SOFC/SOEC Single Cells

et al. 2016

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“…Gadolinia doped cerium oxide (GDC) exhibits MIEC properties in reducing atmospheres and, in combination with metallic current collectors, is considered a prime candidate as a future alternative anode material. Furthermore, it has been shown that infiltration of classical nickel/yttria stabilized zirconia (Ni/YSZ) ceramic-metal composite SOFC anodes with doped or undoped cerium oxide, or even complete substitution of YSZ, improves their resilience against sulphur poisoning [4,5,6,7,8,9,10,11,12,13,14]. This property is highly sought after for enabling the commercialization of SOFCs, where tolerance against hydrogen sulphide containing fuels like diesel reformate or bio gas is an important requirement.…”

Section: Introductionmentioning

confidence: 99%

“…While this explanation seems reasonable, a recent study showed that despite the high sulphur coverage of the Ni phase, it retains its catalytic activity in large parts [11]. However, by introduction of the mixed conducting ceria, the reactive site is extended onto the ceria surface, making Ni/ceria based cermets less prone to sulphur poisoning [10,13]. …”

Section: Introductionmentioning

confidence: 99%

“…It seems like a logical next step to test Ni/GDC as a substitute for the traditional Ni/YSZ cermet electrodes, which show severe degradation under operation with sulphur containing fuels [10,13,16,21,22]. However, a thorough understanding of the poisoning mechanisms of both Ni/YSZ and GDC is important for an informed improvement strategy toward sulphur tolerant SOFC anodes [10,11,12,15,17,18,23,24].…”

Section: Introductionmentioning

confidence: 99%

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The Sulphur Poisoning Behaviour of Gadolinia Doped Ceria Model Systems in Reducing Atmospheres

et al. 2016

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An array of analytical methods including surface area determination by gas adsorption using the Brunauer, Emmett, Teller (BET) method, combustion analysis, XRD, ToF-SIMS, TEM and impedance spectroscopy has been used to investigate the interaction of gadolinia doped ceria (GDC) with hydrogen sulphide containing reducing atmospheres. It is shown that sulphur is incorporated into the GDC bulk and might lead to phase changes. Additionally, high concentrations of silicon are found on the surface of model composite microelectrodes. Based on these data, a model is proposed to explain the multi-facetted electrochemical degradation behaviour encountered during long term electrochemical measurements. While electrochemical bulk properties of GDC stay largely unaffected, the surface polarisation resistance is dramatically changed, due to silicon segregation and reaction with adsorbed sulphur.

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“…SOFC systems can be operated without significant degradation using fuels with hydrogen sulfide concentrations of up to x H 2 S = 1 ppm. [17] This concentration can be reached with tech- Table 1. Composition of the product gas of anaerobic digestion.…”

Section: Introductionmentioning

confidence: 98%

Oxidative Dry‐Reforming of Biogas: Reactor Design and SOFC System Integration

et al. 2013

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Biogas is an attractive fuel for solid oxide fuel cell applications because of the high CO2 content. Its composition allows a high electrical efficiency without adding external water to the system. Because of the CO2 reforming reaction only a very small amount of air is needed for partial oxidation, which is why the process could be called oxidative dry‐reforming. Herein, this concept is demonstrated by a thermodynamic analysis of the process and experimental system and component results. In order to realize a high yield of electrical power from the SOFC stack, a large flow of chemical energy into the stack is needed. To achieve this goal the efficiency of the reforming process is essential. With optimized reforming conditions it is possible to increase the chemical energy content of the fuel by adding an ample amount of heat to the reforming step. To achieve this in practice, the necessary heat flow to the reformer has to be calculated for a given operating temperature. Based on these thermodynamic calculations a reactor was built and tested. After successful laboratory tests the reactor was integrated into an SOFC system, where the necessary heat for the reforming step was supplied by the afterburner. The results of the component tests were verified under system conditions. Based on this system concept a high value for the electrical efficiency (ηel>0.5) of the system was achieved.

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Comparison of the performances of single cell solid oxide fuel cell stacks with Ni/8YSZ and Ni/10CGO anodes with H2S containing fuel

Cited by 48 publications

References 33 publications

Influence of Electrode Design and Contacting Layers on Performance of Electrolyte Supported SOFC/SOEC Single Cells

Influence of Electrode Design and Contacting Layers on Performance of Electrolyte Supported SOFC/SOEC Single Cells

The Sulphur Poisoning Behaviour of Gadolinia Doped Ceria Model Systems in Reducing Atmospheres

Oxidative Dry‐Reforming of Biogas: Reactor Design and SOFC System Integration

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