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Polymer sphere lithography for solid oxide fuel cells: a route to functional, well-defined electrode structures

Brown, Evan C. and Wilke, Stephen K. and Boyd, David A. and Goodwin, David G. and Haile, Sossina M. (2010) Polymer sphere lithography for solid oxide fuel cells: a route to functional, well-defined electrode structures. Journal of Materials Chemistry, 20 (11). pp. 2190-2196. ISSN 0959-9428.

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As a first step towards mechanistic studies of fuel cell electrodes with both well-defined and functionally representative structural features, two-dimensional anti-dot metal films with tunable features are prepared. The fabrication employs a facile, sacrificial templating method, known as polymer sphere lithography, and the resulting metal films are fully connected, yet fully porous. Using initial bead sizes in the range of 500 nm to 3.2 m and oxygen plasma etching to remove from ¼ to ¾ of the original bead diameter, computed triple phase boundary densities in the porous films of 2,000 to 43,500 cm cm-2 are achieved. Image analysis shows the computed (theoretical) and experimental structural features to be in good agreement, demonstrating sufficient perfection in the films for electrochemical studies. Furthermore, thermal stability under hydrogen of thermally evaporated Ni films is excellent, with negligible change in triple phase boundary length as required for quantitative electrochemical measurements. Ultimately, these two-dimensional metallic networks may also serve as the platform for future fabrication of three-dimensional electrodes with truly optimized structural features.

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Haile, Sossina M.0000-0002-5293-6252
Additional Information:© The Royal Society of Chemistry 2010. Received 9th October 2009, Accepted 4th December 2009. First published on the web 25th January 2010. The authors gratefully acknowledge William Chueh for valuable discussions and for providing epitaxial ceria, as well Chang-yi Li for providing AFM images. This work is supported by the Global Climate and Energy Program (GCEP) of Stanford University, funded by a consortium of industrial sponsors.
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Global Climate and Energy Project (GCEP)UNSPECIFIED
Issue or Number:11
Record Number:CaltechAUTHORS:20100401-095039064
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:17835
Deposited By: Ruth Sustaita
Deposited On:07 Apr 2010 16:13
Last Modified:03 Oct 2019 01:34

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