Fuel Cells (SOFC): Alternative Approaches (Electroytes, Electrodes, Fuels)

Sasaki, Kazunari; Nojiri, Y.; Shiratori, Yusuke; Taniguchi, Shunsuke

doi:10.1007/978-1-4419-0851-3_138

Cited by 4 publications

(2 citation statements)

References 264 publications

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“…Typical I-V characteristics of the model cell have been published in previous papers. 14,15 Pt paste was used to prepare the reference electrode, locating more than 2 mm away from the edge of the cathode on the cathode side of the model cell.…”

Section: Methodsmentioning

confidence: 99%

Sulfur Poisoning of SOFCs: Voltage Oscillation and Ni Oxidation

Yoshizumi

Taniguchi²,

Shiratori

et al. 2012

J. Electrochem. Soc.

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Sulfur is one of the major contaminants for SOFC anodes, and can cause performance degradation of SOFC systems. In the present study, H 2 S poisoning phenomena are analyzed at around 800 • C, using electrolyte-supported single cells to understand Ni anode degradation mechanisms, especially under relatively oxidizing conditions. Anode performance degradation caused by sulfur in partially or fully pre-reformed CH 4 -based fuels has been evaluated as a function of various operational parameters, including; operational temperature, pre-reforming ratio, steam-to-carbon ratio, fuel utilization, and current density, for different fuel compositions. Besides the well-known change in cell voltage by the reversible surface adsorption/desorption mechanism, sulfur poisoning phenomena associated with voltage oscillation and Ni oxidation are newly found at high fuel utilizations and at high current densities, respectively. Such degradation is associated with the increase in the O/Ni ratio, and grain growth of Ni-based particles in the anodes.

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Section: Methodsmentioning

confidence: 99%

Sulfur Poisoning of SOFCs: Voltage Oscillation and Ni Oxidation

Yoshizumi

Taniguchi²,

Shiratori

et al. 2012

J. Electrochem. Soc.

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“…If a mixed-conducting material is used for the electrodes, adsorption and dissociation reactions on the electrode surface followed by the bulk diffusion from the electrode surface into the electrode material may dominate the whole electrode reactions. 23,24,[60][61][62][63] Exchange current density values should be reconsidered for this situation where surface exchange coefficient or bulk diffusion coefficient will be rate-determining.…”

Section: Rate-determining Reactionmentioning

confidence: 99%

Exchange Current Density of SOFC Electrodes: Theoretical Relations and Partial Pressure Dependencies Rate-Determined by Electrochemical Reactions

Hosoi

Yonekura

Sunada

et al. 2014

J. Electrochem. Soc.

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As a theoretical consideration on electrode defect chemistry, general relations of exchange current density quantitatively representing Solid Oxide Fuel Cell (SOFC) electrode performance are systematically derived as a function of gas partial pressures, equilibrium constants of adsorption and dissociation reactions on electrode surfaces, and electrochemical reaction rate constants for possible elemental reactions at the cathode and the anode, in the case that an electrochemical reaction is the rate-determining electrode reaction. Simplified expressions are also derived, under the condition that one kind of neutral or charged adsorbed species is predominant at the electrode, to derive gas partial pressure dependence of exchange current density for given rate-determining electrochemical reactions. Importance of considering elementary steps is highlighted to derive rate equations and to clarify various dependencies. Partial pressure dependencies of the exchange current density are compiled and discussed by simulating normalized exchange current density values for given partial pressures. The applicability and limitation of the Butler-Volmer type expressions of exchange current density for SOFC electrodes are carefully discussed.

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Why Hydrogen? Why Fuel Cells?

Sasaki

2016

Green Energy and Technology

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Fuel Cells (SOFC): Alternative Approaches (Electroytes, Electrodes, Fuels)

Cited by 4 publications

References 264 publications

Sulfur Poisoning of SOFCs: Voltage Oscillation and Ni Oxidation

Sulfur Poisoning of SOFCs: Voltage Oscillation and Ni Oxidation

Exchange Current Density of SOFC Electrodes: Theoretical Relations and Partial Pressure Dependencies Rate-Determined by Electrochemical Reactions

Why Hydrogen? Why Fuel Cells?

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