Evaluation of the Effect of Sulfur on the Performance of Nickel/Gadolinium‐Doped Ceria Based Solid Oxide Fuel Cell Anodes

Riegraf, Matthias; Yurkiv, Vitaliy; Costa, Rémi; Schiller, Günter; Friedrich, K. Andreas

doi:10.1002/cssc.201601320

Cited by 64 publications

(102 citation statements)

References 72 publications

(255 reference statements)

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“…Thus, the Ce 3+ /Ce 4+ ratio determines the chemical capacitance values which stretch over a whole order of magnitude (0.1-1 F·cm -2 ). This quantitatively confirms an effect that we already qualitatively observed in sulfur poisoning experiments of Ni/CGO electrodes in our recent work (12).…”

Section: Resultssupporting

confidence: 92%

“…Different possible fuel oxidation mechanisms were extensively discussed in our previous work, and the possibility of competitive pathways at double phase and triple phase boundary was pointed out (12,18,19). Thus, it is possible that the change in hydrogen oxidation mechanism is the reason for the different slopes in Figure 4a.…”

Section: Resultsmentioning

confidence: 82%

“…Furthermore, the electrodes contain a current collector layer with increased Ni content. Full cells with the same fuel electrode were characterized in detail by means of current-voltage characteristics, electrochemical impedance spectroscopy and scanning electron microscopy (SEM) in our previous publications (12,18,19).…”

Section: Methodsmentioning

confidence: 99%

“…However, this approach has been proven to be more difficult for Ni/CGO10-based cells due to the occurrence of a low frequency electrode process at ~1 Hz, and therefore the convolution of anode, cathode, and mass transport contributions with similar relaxation frequencies (2,12). This low frequency process was attributed to a surface process, most likely the electrode charge transfer reaction (12). Its low frequency was correlated with the occurrence of a large chemical capacitance that originates in the oxygen non-stoichiometry of CGO.…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical Impedance Analysis of Ni/CGO10-Based Electrolyte-Supported Cells

Riegraf¹,

Dierickx²,

Weber³

et al. 2019

ECS Trans.

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To obtain a better understanding of the behavior of Ni/CGO fuel electrodes, this work presents a comprehensive investigation of Ni/CGO10-based electrolyte-supported cells. Commercial Ni/CGO10|CGO10|3YSZ|CGO10|Ni/CGO10-based symmetrical cells were characterized between 550 -975 °C at pH 2 = 0.8 bar and pH 2 O = 0.2 bar and for different H 2 /H 2 O gas mixtures at 550 °C. Small electrode area, thin anodes and large gas flow rates were used to minimize mass transport contributions. The distribution of relaxation times (DRT) is calculated and based on the results, an equivalent circuit model is derived. Electrode process contributions on Ni/CGO were calculated by means of a complex non-linear square fit of the equivalent circuit model to experimental data. One low frequency and one middle frequency electrode process were identified and correlated to a surface and a bulk process, respectively. Apparent activation energy barriers for both processes were derived.

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 82%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrochemical Impedance Analysis of Ni/CGO10-Based Electrolyte-Supported Cells

Riegraf¹,

Dierickx²,

Weber³

et al. 2019

ECS Trans.

Self Cite

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“…The active area of the planar cells was 4 x 4 cm 2 with a total area of 5 x 5 cm 2 . The setup for cell testing enables the characterization of up to four cells simultaneously and has been illustrated and described in detail elsewhere (11,20). All gases were supplied via mass flow controllers.…”

Section: Methodsmentioning

confidence: 99%

Sulfur Poisoning of Ni/CGO Anodes: A Long-Term Degradation Study

et al. 2017

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This work presents an in-depth analysis of long-term degradation due to sulfur poisoning of Ni/CGO10-based SOFC. A parameter study of the sulfur-induced long-term degradation of commercial, highperformance single cells was conducted with an accumulated cell testing time of more than one year. The long-term degradation behavior is investigated at 900 °C for different H 2 S concentrations and varying H 2 /H 2 O/N 2 fuel gas atmospheres. The sulfur poisoning periods of the different cells varied from 100 up to 1500 h. The progress of the degradation during the experiments was monitored by means of electrochemical impedance spectroscopy. It is shown that Ni/CGO anodes can be exposed to 1 ppm H 2 S and operated without significant irreversible degradation at a current density of 0.5 A·cm -2 for 1500 h for certain fuel gas mixtures, demonstrating their promising long-term stability. However, for reduced hydrogen partial pressures in the fuel gas, the same H 2 S concentration leads to a considerable voltage decrease that is reflected by an increase in anode charge transfer resistance. Furthermore, the microstructural evolution of the Ni/CGO is examined ex-situ by means of SEM and correlated to the anode performance degradation. The existence of a stable operating regime for Ni/CGO anodes under sulfur exposure is clearly shown and the critical operating parameters are outlined. The presented results give important insights into the degradation processes occurring during long-term operation of Ni/CGO anodes as well as strategies for stable SOFC operation. Moreover, the results encourage to further optimize the performance and sulfur tolerance of Ni/CGO anodes.

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Method and Application of Surface Modification of Cerium Dioxide

Wang,

Xu,

Zhao

et al. 2024

Adv Eng Mater

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Airborne pollutants, such as nitrogen oxides (NOx), and waterborne contaminants, including heavy metals, dyes, and other pollutants, pose substantial environmental threats and jeopardize human health. Additionally, certain limitations have hindered the widespread application of some batteries, primarily attributed to elevated operating temperatures and the decreasing use of fossil fuels. In response to these challenges, cerium dioxide (CeO2) nanoparticles have garnered considerable attention due to their unique and advantageous physical and chemical properties. Furthermore, the incorporation of CeO2 into various coating materials has demonstrated the potential to significantly enhance their performance. In the realm of biotechnology, research into CeO2 nanoparticles continues to expand, encompassing a range of applications such as the scavenging of reactive oxygen species (ROS) in biological systems, the development of anti‐inflammatory agents, and cancer research. Nevertheless, in these diverse applications, CeO2 still exhibits certain limitations that hinder the achievement of desired outcomes. The modification of CeO2 nanoparticles presents a promising avenue to address these limitations, thereby improving their overall efficacy. As such, this review aims to comprehensively compare and summarize various methods for the modification of CeO2 nanoparticles, elucidate their practical applications, and provide insights into the potential challenges and future prospects in this field.This article is protected by copyright. All rights reserved.

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Evaluation of the Effect of Sulfur on the Performance of Nickel/Gadolinium‐Doped Ceria Based Solid Oxide Fuel Cell Anodes

Cited by 64 publications

References 72 publications

Electrochemical Impedance Analysis of Ni/CGO10-Based Electrolyte-Supported Cells

Electrochemical Impedance Analysis of Ni/CGO10-Based Electrolyte-Supported Cells

Sulfur Poisoning of Ni/CGO Anodes: A Long-Term Degradation Study

Method and Application of Surface Modification of Cerium Dioxide

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