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Electrochemically modified, robust solid oxide fuel cell anode for direct-hydrocarbon utilization

Choi, Yoonseok and Brown, Evan C. and Haile, Sossina M. and Jung, WooChul (2016) Electrochemically modified, robust solid oxide fuel cell anode for direct-hydrocarbon utilization. Nano Energy, 23 . pp. 161-171. ISSN 2211-2855. https://resolver.caltech.edu/CaltechAUTHORS:20160527-091829937

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Abstract

A main advantage of solid oxide fuel cells (SOFCs) operating at a high temperature (>650 °C) is the flexibility of the fuel they use, specifically as they offer the possibility to utilize methane (natural gas). Unfortunately, however, the state-of-the-art SOFC anodes, composed of a nickel and an anionically conducting oxide such as yttria-stabilized zirconia (YSZ), are associated with Ni-catalyzed carbon deposition and the ensuing degradation of the anode performance. Here, we address these issues through the application of a simple, scalable, cost-effective ceramic coating method known as cathodic electrochemical deposition (CELD). Samaria-doped CeO_2 (SDC) was chosen as the coating material due to its high chemical stability against carbon formation, high electronic and ionic conductivities, and favorable electrocatalytic activity toward fuel oxidation reaction. Nanostructured SDC layers with a high specific surface area were successfully coated onto Ni surfaces via CELD. The physical and chemical attributes of each coating were characterized by a range of analysis tools, in this case SEM, TEM, XRD, EDS, ICP-MS and Raman spectroscopy. An analysis of the AC impedance spectroscopy (ACIS) of Ni-patterned YSZ symmetric cells (anode|electrolyte|anode) with SDC coatings revealed significantly enhanced electrode activity toward fuel oxidation and coking stability under dry or wet methane fuel at 650 °C. These results suggest that the Ni-surface modification via CELD can be a feasible solution for the direct use of hydrocarbon fuels in SOFCs.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/j.nanoen.2016.03.015 DOIArticle
http://www.sciencedirect.com/science/article/pii/S2211285516300386PublisherArticle
ORCID:
AuthorORCID
Haile, Sossina M.0000-0002-5293-6252
Additional Information:© 2016 Elsevier Ltd. Received 6 January 2016, Revised 14 March 2016, Accepted 27 March 2016, Available online 30 March 2016.
Subject Keywords:Solid oxide fuel cell anode; Sm-doped ceria; Electrochemical deposition; Coking resistance; Impedance spectroscopy
Record Number:CaltechAUTHORS:20160527-091829937
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20160527-091829937
Official Citation:Yoonseok Choi, Evan C. Brown, Sossina M. Haile, WooChul Jung, Electrochemically modified, robust solid oxide fuel cell anode for direct-hydrocarbon utilization, Nano Energy, Volume 23, May 2016, Pages 161-171, ISSN 2211-2855, http://dx.doi.org/10.1016/j.nanoen.2016.03.015. (http://www.sciencedirect.com/science/article/pii/S2211285516300386)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:67430
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:27 May 2016 16:44
Last Modified:03 Oct 2019 10:05

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