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High-temperature structural stability of ceria-based inverse opals

Casillas, Danielle C. and Wilkinson, Dan C. and Lai, Chun-Han and Wilke, Stephen K. and Ignatowich, Michael J. and Haile, Sossina M. and Dunn, Bruce S. (2017) High-temperature structural stability of ceria-based inverse opals. Journal of the American Ceramic Society, 100 (6). pp. 2659-2668. ISSN 0002-7820. doi:10.1111/jace.14781.

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The use of ceria-based inverse opals as a catalyst system for the thermochemical production of fuels from sunlight offers the potential of improved fuel production kinetics over materials with random porosity. Quantitative methods for characterizing ordered porosity are lacking, thus limiting the ability to predict the lifetime of ordered structures at elevated temperatures. In the present work, Fourier transform image analysis was used to determine the effect of composition and temperature on ordered porosity for a series of CeO_2-ZrO_2 inverse opals having pore sizes ranging from 300 nm to 1 μm. An order parameter, γ, derived from the image analysis, was applied to scanning electron microscopy images and used to determine the degree of order in the inverse opal. The thermal stability studies indicate that loss of ordered porosity is highly dependent on temperature and that gas cycling effects have a minor effect on periodicity. A minimum Zr content of 20 at.% is necessary to retain periodicity for annealing up to 1000°C with pore diameters larger than 1 μm. These results show that CeO_2-ZrO_2 inverse opals can be used at higher temperatures than previously thought for efficient thermochemical hydrogen production without loss of the benefits associated with ordered porosity.

Item Type:Article
Related URLs:
URLURL TypeDescription
Haile, Sossina M.0000-0002-5293-6252
Dunn, Bruce S.0000-0001-5669-4740
Additional Information:© 2017 The American Ceramic Society. Issue online: 1 June 2017; Version of record online: 25 March 2017; Manuscript Accepted: 13 January 2017; Manuscript Received: 31 August 2016. This work was supported by EFRI-RESTOR (1038307) grant funded by the National Science Foundation (NSF). The authors gratefully acknowledge X. Zhou, R. Tucker, and M. Moz for optimization of polystyrene bead synthesis.
Funding AgencyGrant Number
Subject Keywords:catalysts/catalysis; ceria; inverse opal; thermal stability; zirconia
Issue or Number:6
Record Number:CaltechAUTHORS:20170623-091326652
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Official Citation:Casillas DC, Wilkinson DC, Lai CH, et al. High-temperature structural stability of ceria-based inverse opals. J Am Ceram Soc. 2017;100:2659–2668
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:78482
Deposited By: Tony Diaz
Deposited On:24 Jun 2017 03:11
Last Modified:15 Nov 2021 17:40

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