Freeze-cast yttria-stabilized zirconia pore networks: Effects of alcohol additives
Abstract
Freeze casting yttria-stabilized zirconia (YSZ) can be useful in making electrodes for solid oxide fuel cells (SOFCs) by introducing hierarchical porosity to increase triple-phase boundary (TPB) area while maintaining adequate fuel flow. In this study the influence of alcohol additives on pore structure of aqueous YSZ freeze-cast samples was investigated. Slurries with ethanol, iso-propyl alcohol, or methanol as additives were compared to a control sample. Pore characteristics along sample lengths were measured using X-ray computed tomography reconstructions. The control sample showed significant changes in pore size along sample length, whereas pore size of the alcohol additive samples remained similar, indicating that freezing rates of the additive samples remained constant during solidification. Ice lens formation and interactions between alcohols and slurry functional additives (dispersant, surfactant, and binder) resulted in complex pore structures which show promise in increasing SOFC TPB area.
Additional Information
© 2017 The American Ceramic Society. Issue online: 9 February 2018; Version of record online: 13 September 2017; Accepted manuscript online: 24 August 2017; Manuscript Accepted: 12 August 2017; Manuscript Received: 6 June 2017. Special Topic: Ceramics for Solid Oxide Fuel Cells. This work was supported by a U.S. National Aeronautics and Space Administration (NASA) Space Technology Research Fellowship and used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. This work also made use of the OMM Facility which receives support from the MRSEC Program (NSF DMR-1121262) of the Materials Research Center at Northwestern University and the EPIC facility (NUANCE Center-Northwestern University), which has received support from the MRSEC program (NSF DMR-1121262) at the Materials Research Center; the International Institute for Nanotechnology (IIN); and the State of Illinois, through the IIN.Attached Files
Accepted Version - Miller_et_al-2017-International_Journal_of_Applied_Ceramic_Technology.pdf
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Additional details
- Alternative title
- Freeze-Cast YSZ Pore Networks: Effects of Alcohol Additives
- Eprint ID
- 80803
- Resolver ID
- CaltechAUTHORS:20170825-143142523
- NASA
- DE-AC02-06CH11357
- Department of Energy (DOE)
- DMR-1121262
- NSF
- Northwestern University
- State of Illinois
- Created
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2017-08-28Created from EPrint's datestamp field
- Updated
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2021-11-15Created from EPrint's last_modified field