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Evaluation of Bi_(2)V_(0.9)Cu_(0.1)O_(5.35) — an Aurivillius-Type Conducting Oxide — as a Cathode Material for Single-Chamber Solid-Oxide Fuel Cells

Shao, Zongping and Mederos, Jennifer and Kwak, Chan and Haile, Sossina M. (2010) Evaluation of Bi_(2)V_(0.9)Cu_(0.1)O_(5.35) — an Aurivillius-Type Conducting Oxide — as a Cathode Material for Single-Chamber Solid-Oxide Fuel Cells. Journal of Fuel Cell Science and Technology, 7 (2). 021016. ISSN 1550-624X.

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The compoundBi_(2)V_(0.9)Cu_(0.1)O_(5.35), a typical Aurivillius-type fast oxygen ion conductor, was evaluated as a possible cathode material for single-chamber solid-oxide fuel cells operated under mixed propane and oxygen. The material was found to be structurally stable under various C_(3)H_(8)+ O_2 environments over a wide temperature range and furthermore displayed low catalytic activity for propane oxidation. However, at temperatures above 650°C, detrimental reactions between the cathode and the ceria electrolyte occurred, producing low conductivity interfacial phases. At these high temperatures the cathode additionally underwent extensive sintering and loss of porosity and, thus, stable fuel cell operation was limited to furnace temperatures of <600°C. Even under such conditions, however, the partial oxidation occurring at the anode (a ceria nickel cermet) resulted in cell temperatures as much as 70–110°C higher than the gas-phase temperature. This explains the sharp decrease in fuel cell performance with time during operation at a furnace temperature of 586°C. Under optimized conditions, a peak power density of ~60 mW/cm^2 was obtained, which does not compete with recent values obtained from higher activity cathodes. Thus, the poor electrochemical activity of Bi_(2)V_(0.9)Cu_(0.1)O_(5.35), combined with its chemical instability at higher temperatures, discourages further consideration of this material as a cathode in single-chamber fuel cells.

Item Type:Article
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URLURL TypeDescription
Haile, Sossina M.0000-0002-5293-6252
Additional Information:© 2010 American Society of Mechanical Engineers. Received 8 May 2008; revised 3 February 2009; published 12 January 2010. This work was funded by DARPA, Microsystems Technology Office under Award No. N66001-01-1-8966. Additional support was provided by the National Science Foundation, Division of Materials Research, through its support of the Caltech Center for the Science and Engineering of Materials under Grant No. DMR-0520565.
Funding AgencyGrant Number
Office of Naval Research (ONR)N66001-01-1-8966
Defense Advanced Research Projects Agency (DARPA)UNSPECIFIED
Subject Keywords:bismuth compounds; cathodes; copper compounds; solid oxide fuel cells; vanadium compounds
Issue or Number:2
Classification Code:PACS: 82.47.Ed Solid-oxide fuel cells (SOFC)
Record Number:CaltechAUTHORS:20100216-152924665
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Official Citation:Evaluation of Bi[sub 2]V[sub 0.9]Cu[sub 0.1]O[sub 5.35]---an Aurivillius-Type Conducting Oxide---as a Cathode Material for Single-Chamber Solid-Oxide Fuel Cells Zongping Shao, Jennifer Mederos, Chan Kwak, and Sossina M. Haile, J. Fuel Cell Sci. Technol. 7, 021016 (2010), DOI:10.1115/1.3182729
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:17493
Deposited By: Jason Perez
Deposited On:17 Feb 2010 18:55
Last Modified:03 Oct 2019 01:28

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