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Impact of enhanced oxide reducibility on rates of solar-driven thermochemical fuel production

Published online by Cambridge University Press:  09 October 2017

Michael J. Ignatowich ,
Alexander H. Bork ,
Timothy C. Davenport ,
Jennifer L. M. Rupp ,
Chih-kai Yang ,
Yoshihiro Yamazaki  and
Sossina M. Haile
Michael J. Ignatowich
Affiliation:
Department of Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA
Alexander H. Bork
Affiliation:
ETH Zürich, Zürich 8093, Switzerland
Timothy C. Davenport
Affiliation:
Department of Materials Science, Northwestern University, Evanston, IL 60208, USA
Jennifer L. M. Rupp
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
Chih-kai Yang
Affiliation:
Materials Science, California Institute of Technology, Pasadena, CA 91125, USA
Yoshihiro Yamazaki
Affiliation:
INAMORI Frontier Research Center, Kyushu University, Fukuoka 819-0395, Japan
Sossina M. Haile*
Affiliation:
Department of Materials Science, Northwestern University, Evanston, IL 60208, USA Materials Science, California Institute of Technology, Pasadena, CA 91125, USA
*
Address all correspondence to S. M. Haile at sossina.haile@northwestern.edu
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Abstract

Two-step, solar-driven thermochemical fuel production offers the potential of efficient conversion of solar energy into dispatchable chemical fuel. Success relies on the availability of materials that readily undergo redox reactions in response to changes in environmental conditions. Those with a low enthalpy of reduction can typically be reduced at moderate temperatures, important for practical operation. However, easy reducibility has often been accompanied by surprisingly poor fuel production kinetics. Using the La1−x Sr x MnO3 series of perovskites as an example, we show that poor fuel production rates are a direct consequence of the diminished enthalpy. Thus, material development efforts will need to balance the countering thermodynamic influences of reduction enthalpy on fuel production capacity and fuel production rate.

Type
Research Letters
Information
MRS Communications , Volume 7 , Issue 4 , December 2017 , pp. 873 - 878
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Copyright
Copyright © Materials Research Society 2017 

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