Operation of ceria-electrolyte solid oxide fuel cells on iso-octane-air fuel mixtures

Zhongliang Zhan; Scott A. Barnett

doi:10.1016/j.jpowsour.2005.08.008

Operation of ceria-electrolyte solid oxide fuel cells on iso-octane-air fuel mixtures

Zhongliang Zhan, Scott A. Barnett^*

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

61 Scopus citations

Abstract

Reduced-temperature solid oxide fuel cells (SOFCs) - with thin Ce_0.85Sm_0.15O_1.925 (SDC) electrolytes, thick Ni-SDC anode supports, and composite cathodes containing La_0.6Sr_0.4Co_0.2Fe_0.8O₃ (LSCF) and SDC - were fabricated and tested with iso-octane/air fuel mixtures. An additional supported catalyst layer, placed between the fuel stream and the anode, was needed to obtain a stable output power density (e.g. 0.6 W cm^-2 at 590 °C) without anode coking. The Ru-CeO₂ catalyst produced CO₂ and H₂ at temperatures <350 °C, while H₂ and CO became predominant above 500 °C. Power densities were substantially less than for the same cells with H₂ fuel (e.g. 1.0 W cm^-2 at 600 °C), due to the dilute (≈20%) hydrogen in the fuel mixture produced by iso-octane partial oxidation. Electrochemical impedance analysis showed a main arc that represented ≈60% of the total resistance, and that increased substantially upon switching from hydrogen to iso-octane/air.

Original language	English (US)
Pages (from-to)	422-429
Number of pages	8
Journal	Journal of Power Sources
Volume	157
Issue number	1
DOIs	https://doi.org/10.1016/j.jpowsour.2005.08.008
State	Published - Jun 19 2006

Funding

The authors gratefully acknowledge the financial support of the Defense Advanced Research Projects Agency, funded via California Institute of Technology, during the course of this work. The authors thank Dr. Yi Jiang for describing the colloidal “drop coating” technique used for depositing the electrolyte layers.

Keywords

Catalyst
Hydrocarbons
Partial oxidation
Solid oxide fuel cells
iso-Octane

ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment
Energy Engineering and Power Technology
Physical and Theoretical Chemistry
Electrical and Electronic Engineering

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.jpowsour.2005.08.008

Cite this

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title = "Operation of ceria-electrolyte solid oxide fuel cells on iso-octane-air fuel mixtures",

abstract = "Reduced-temperature solid oxide fuel cells (SOFCs) - with thin Ce0.85Sm0.15O1.925 (SDC) electrolytes, thick Ni-SDC anode supports, and composite cathodes containing La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) and SDC - were fabricated and tested with iso-octane/air fuel mixtures. An additional supported catalyst layer, placed between the fuel stream and the anode, was needed to obtain a stable output power density (e.g. 0.6 W cm-2 at 590 °C) without anode coking. The Ru-CeO2 catalyst produced CO2 and H2 at temperatures <350 °C, while H2 and CO became predominant above 500 °C. Power densities were substantially less than for the same cells with H2 fuel (e.g. 1.0 W cm-2 at 600 °C), due to the dilute (≈20%) hydrogen in the fuel mixture produced by iso-octane partial oxidation. Electrochemical impedance analysis showed a main arc that represented ≈60% of the total resistance, and that increased substantially upon switching from hydrogen to iso-octane/air.",

keywords = "Catalyst, Hydrocarbons, Partial oxidation, Solid oxide fuel cells, iso-Octane",

author = "Zhongliang Zhan and Barnett, {Scott A.}",

note = "Funding Information: The authors gratefully acknowledge the financial support of the Defense Advanced Research Projects Agency, funded via California Institute of Technology, during the course of this work. The authors thank Dr. Yi Jiang for describing the colloidal “drop coating” technique used for depositing the electrolyte layers.",

year = "2006",

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TY - JOUR

T1 - Operation of ceria-electrolyte solid oxide fuel cells on iso-octane-air fuel mixtures

AU - Zhan, Zhongliang

AU - Barnett, Scott A.

N1 - Funding Information: The authors gratefully acknowledge the financial support of the Defense Advanced Research Projects Agency, funded via California Institute of Technology, during the course of this work. The authors thank Dr. Yi Jiang for describing the colloidal “drop coating” technique used for depositing the electrolyte layers.

PY - 2006/6/19

Y1 - 2006/6/19

N2 - Reduced-temperature solid oxide fuel cells (SOFCs) - with thin Ce0.85Sm0.15O1.925 (SDC) electrolytes, thick Ni-SDC anode supports, and composite cathodes containing La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) and SDC - were fabricated and tested with iso-octane/air fuel mixtures. An additional supported catalyst layer, placed between the fuel stream and the anode, was needed to obtain a stable output power density (e.g. 0.6 W cm-2 at 590 °C) without anode coking. The Ru-CeO2 catalyst produced CO2 and H2 at temperatures <350 °C, while H2 and CO became predominant above 500 °C. Power densities were substantially less than for the same cells with H2 fuel (e.g. 1.0 W cm-2 at 600 °C), due to the dilute (≈20%) hydrogen in the fuel mixture produced by iso-octane partial oxidation. Electrochemical impedance analysis showed a main arc that represented ≈60% of the total resistance, and that increased substantially upon switching from hydrogen to iso-octane/air.

AB - Reduced-temperature solid oxide fuel cells (SOFCs) - with thin Ce0.85Sm0.15O1.925 (SDC) electrolytes, thick Ni-SDC anode supports, and composite cathodes containing La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) and SDC - were fabricated and tested with iso-octane/air fuel mixtures. An additional supported catalyst layer, placed between the fuel stream and the anode, was needed to obtain a stable output power density (e.g. 0.6 W cm-2 at 590 °C) without anode coking. The Ru-CeO2 catalyst produced CO2 and H2 at temperatures <350 °C, while H2 and CO became predominant above 500 °C. Power densities were substantially less than for the same cells with H2 fuel (e.g. 1.0 W cm-2 at 600 °C), due to the dilute (≈20%) hydrogen in the fuel mixture produced by iso-octane partial oxidation. Electrochemical impedance analysis showed a main arc that represented ≈60% of the total resistance, and that increased substantially upon switching from hydrogen to iso-octane/air.

KW - Catalyst

KW - Hydrocarbons

KW - Partial oxidation

KW - Solid oxide fuel cells

KW - iso-Octane

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Operation of ceria-electrolyte solid oxide fuel cells on iso-octane-air fuel mixtures

Abstract

Funding

Keywords

ASJC Scopus subject areas

UN SDGs

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