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Issue 18, 2014
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Efficiency maximization in solar-thermochemical fuel production: challenging the concept of isothermal water splitting

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Abstract

Widespread adoption of solar-thermochemical fuel production depends on its economic viability, largely driven by the efficiency of use of the available solar resource. Herein, we analyze the efficiency of two-step cycles for thermochemical hydrogen production, with emphasis on efficiency. Owing to water thermodynamics, isothermal H2 production is shown to be impractical and inefficient, irrespective of reactor design or reactive oxide properties, but an optimal temperature difference between cycle steps, for which efficiency is the highest, can be determined for a wide range of other operating parameters. A combination of well-targeted pressure and temperature swing, rather than either individually, emerges as the most efficient mode of operation of a two-step thermochemical cycle for solar fuel production.

Graphical abstract: Efficiency maximization in solar-thermochemical fuel production: challenging the concept of isothermal water splitting

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Article information


Submitted
12 Dec 2013
Accepted
10 Mar 2014
First published
25 Mar 2014

Phys. Chem. Chem. Phys., 2014,16, 8418-8427
Article type
Paper
Author version available

Efficiency maximization in solar-thermochemical fuel production: challenging the concept of isothermal water splitting

I. Ermanoski, J. E. Miller and M. D. Allendorf, Phys. Chem. Chem. Phys., 2014, 16, 8418
DOI: 10.1039/C4CP00978A

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