Assessment of Sulfur Poisoning of Ni/CGO-Based SOFC Anodes

Riegraf, Matthias; Zekri, Atef; Yurkiv, Vitaliy; Costa, Rémi; Schiller, G.; Friedrich, K. Andreas

doi:10.1149/07710.0149ecst

Cited by 8 publications

(5 citation statements)

References 31 publications

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“…The growth of the non-ohmic portion of the cell impedance, shown in Figure d, was largely responsible for the performance loss of the reference cell, which is in agreement with results in the literature ,,,, and is dominated by the polarization resistance of the anode. The sharp initial increase in the non-ohmic component of the ASR in all cells is likely the result of sulfur occupying catalytic sites and reducing effective TPB length.…”

Section: Resultssupporting

confidence: 88%

“…More recently, low-to-intermediate temperature SOFCs based on ceria oxygen-ion conductors have become more common. − These cells use a rare earth doped ceria, such as GDC, as the electrolyte and Ni-GDC cermet as the anode. These cells can experience similar performance loss issues to the Ni-YSZ cells when exposed to sulfur, but because of their lower operating temperature (550–650 °C), the mechanisms can differ.…”

Section: Introductionmentioning

confidence: 99%

“…One explanation for this difference is the variable oxidation state of the cerium atom. This variability means that the ceria lattice can readily give up lattice oxygen and prompt gaseous sulfur dioxide formation which lowers the local effective sulfur concentration, thus preventing chemical reactions with the anode structure. , …”

Section: Introductionmentioning

confidence: 99%

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Improved Sulfur Tolerance of SOFCs through Surface Modification of Anodes

Hays¹,

Hussain²,

Huang³

et al. 2018

ACS Appl. Energy Mater.

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SOFCs are a promising technology for high efficiency power generation with fuel flexibility; however, sulfur, a common contaminant in most hydrocarbon fuels, can cause severe anode degradation. Here we demonstrated that surface modification of Ni-GDC-based SOFC through nanoparticle infiltration drastically reduces the sulfur poisoning effect. Infiltrated SOFCs showed stable performance with sulfurcontaminated fuel for over 290 h, while unmodified SOFCs became inoperative after 60 h. We proposed that the nanosized GDC coating promotes sulfur removal through SO 2 formation by increasing the density of reaction sites and providing a ready supply of oxygen to those sites. The significant benefit provided by this electrode treatment is promising for the integration of SOFCs with established fuel compositions.

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Section: Resultssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Improved Sulfur Tolerance of SOFCs through Surface Modification of Anodes

Hays¹,

Hussain²,

Huang³

et al. 2018

ACS Appl. Energy Mater.

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show abstract

“…The consideration of GDC as a catalytically active phase has been confirmed later by investigations of Yokokawa et al (17) on protonic conductivity and H + -solubility in stabilized ceria. The sulfur tolerance of Ni/GDC fuel electrode up to 20 ppm H2S was confirmed by DLR (18).…”

Section: Electrodesmentioning

confidence: 80%

Progress in SOC Development at Fraunhofer IKTS

et al. 2021

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After long and successful development history of Solid Oxide Cells (SOC) continuous improvement in performance, longevity, manufacturing, and system integration it is necessary to bring this highly efficient technology to the market. The activities on material development and optimization at IKTS are focused mainly on enhancement of durability for SOFC, SOEC, and rSOC operation and on boosting the power density. During recent years considerable efforts on simplification and automation of cell and stack manufacturing processes have been addressed. The processes for electrode manufacturing have been adjusted for high yield automated printing on thin electrolytes with integrated quality control measures. Efficient ways for reduction of time and energy consumption for sealing process of SOC stacks have been found and demonstrated in pilot production as well as automated assembling of components to stacks was shown. The increasing interest in “green hydrogen” created multiple opportunities for SOEC technology to be considered as inherent part of industrial and chemical processes. IKTS pioneering work on coupled operation of SOEC module with Fischer-Tropsch reactor provided first demonstration of feasibility of this approach for wax production. However, high power electrolysis applications (>10 MW) will need new approaches for stack design and put higher requirements on durability.

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“…GDC-based electrodes demonstrate positive features, e.g. enhanced electrochemical performance in low operating temperatures [1][2][3][4][5][6], resistivity to sulfur poisoning [7] and carbon deposition [8], etc. As GDC is a mixed ionic-electronic conductor in reducing atmospheres [9], electrochemical reactions can take place at the double phase boundary (DPB) on the GDC surface.…”

Section: Introductionmentioning

confidence: 99%

Correlation Between Microstructure and Performance of GDC-Based Electrodes

Ściążko¹,

Komatsu²,

Shimura³

et al. 2023

ECS Trans.

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Gadolinium doped ceria (GDC) is a promising material for solid oxide cells. GDC is conventionally used as an ionic conductor in composites with electron-conducting metal or perovskite materials. However, recent studies demonstrated that pure GDC fuel electrodes can achieve substantial power density if their microstructure is appropriately designed. Four different types of GDC electrodes are investigated in this study, including conventional Nickel (Ni)-GDC composite, GDC-perovskite composite, GDC deposited with Ni nanoparticles and pure GDC. The test results show a clear correlation between GDC surface area and electrode performance. At the same time, the electrode active thickness depends on the electrode microstructure. It is in the range of 5 µm for the nano-size GDC electrodes. When the GDC electrode is thicker than the active thickness, it results in large ohmic resistance due to the electronic conduction in the outer layer.

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Assessment of Sulfur Poisoning of Ni/CGO-Based SOFC Anodes

Cited by 8 publications

References 31 publications

Improved Sulfur Tolerance of SOFCs through Surface Modification of Anodes

Improved Sulfur Tolerance of SOFCs through Surface Modification of Anodes

Progress in SOC Development at Fraunhofer IKTS

Correlation Between Microstructure and Performance of GDC-Based Electrodes

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