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Thermodynamic and kinetic assessments of strontium-doped lanthanum manganite perovskites for two-step thermochemical water splitting

Yang, Chih-Kai and Yamazaki, Yoshihiro and Aydin, Aykut and Haile, Sossina M. (2014) Thermodynamic and kinetic assessments of strontium-doped lanthanum manganite perovskites for two-step thermochemical water splitting. Journal of Materials Chemistry A, 2 (33). pp. 13612-13623. ISSN 2050-7488. https://resolver.caltech.edu/CaltechAUTHORS:20140721-090759158

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Abstract

Solar-driven thermochemical water splitting using non-stoichiometric oxides has emerged as an attractive technology for solar fuel production. The most widely considered oxide for this purpose is ceria, but the extreme temperatures required to achieve suitable levels of reduction introduce challenges in reactor design and operation, leading to efficiency penalties. Here, we provide a quantitative assessment of the thermodynamic and kinetic properties of La_(1−x)Sr_xMnO_(3−δ) perovskites, targeted for a reduced temperature operation of thermochemical water splitting. Sr-doping into lanthanum manganite increases the thermodynamic fuel production capacity, which reaches 9 ml g^(−1) for 0.4 Sr for a thermochemical cycle operated between 1400 and 800 °C. The hydrogen yields are moreover in good agreement with expected values based on analysis and extrapolation of thermogravimetric data available in the literature. High levels of Sr doping, however, result in low steam-to-hydrogen conversion rates, implying high energy penalties in an operational reactor. Furthermore, the rate of fuel production decreases with increasing Sr content, suggesting that intermediate compositions may yield the most suitable combination of properties.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1039/c4ta02694bDOIArticle
http://pubs.rsc.org/en/Content/ArticleLanding/2014/TA/C4TA02694BPublisherArticle
ORCID:
AuthorORCID
Haile, Sossina M.0000-0002-5293-6252
Additional Information:© 2014 Royal Society of Chemistry. Received 29th May 2014; Accepted 4th July 2014; First published online 04 Jul 2014. This work was supported by the Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science Technology Agency. We thank Prof. William Chueh for fruitful discussions and Mr Stephen Wilke for performing mercury porosimetry measurements. We are further grateful to Prof. Yong Hao for assistance with the preparation of porous samples.
Funders:
Funding AgencyGrant Number
Precursory Research for Embryonic Science and Technology (PRESTO)UNSPECIFIED
Issue or Number:33
Record Number:CaltechAUTHORS:20140721-090759158
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140721-090759158
Official Citation:Yang, C.-K., Yamazaki, Y., Aydin, A., & Haile, S. M. (2014). Thermodynamic and kinetic assessments of strontium-doped lanthanum manganite perovskites for two-step thermochemical water splitting. [10.1039/C4TA02694B]. Journal of Materials Chemistry A. doi: 10.1039/c4ta02694b
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:47357
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:21 Jul 2014 21:38
Last Modified:03 Oct 2019 06:52

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