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Issue 24, 2016
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Efficient ceria nanostructures for enhanced solar fuel production via high-temperature thermochemical redox cycles

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Abstract

Syngas synthesis by solar energy-driven two-step thermochemical redox cycles is a promising approach for large-scale industrial production of renewable fuels. A key challenge is developing durable materials capable of providing and sustaining high redox kinetics under harsh environmental conditions required for efficient operation. Here, we demonstrate that nanostructured ceria with a high surface area and porosity can significantly enhance the initial and long-term syngas production performance. Three types of ceria morphologies were synthesised and comparatively investigated against commercial powders in two-step thermochemical redox cycles, namely nanostructured flame-made and flower-like agglomerates and sol–gel sub-micro particles. Their syngas production performance was assessed in terms of redox kinetics, conversion stoichiometry and structural stability. The flame-made ceria nano-powders had up to 191%, 167% and 99% higher initial average production rates than the flower-like, commercial and sol–gel ceria powders, respectively. This resulted in the highest H2 (480 μmol min−1 g−1) and CO (230 and 340 μmol min−1 g−1) production rates and redox capacity (Δδ = 0.25) so far reported for ceria. Notably, the grain morphology played a key role in the long-term performance and while the redox kinetics of the flower-like ceria rapidly decreased below that of the commercial powders, the flame-made agglomerates maintained up to 57% higher average production rate until the last cycle. These findings show that the thermochemical stabilisation of nano-scale structural features, observed in the flame-made agglomerates, is key to engineering efficient materials for enhanced thermochemical solar fuel production.

Graphical abstract: Efficient ceria nanostructures for enhanced solar fuel production via high-temperature thermochemical redox cycles

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Supplementary files

Article information


Submitted
15 Mar 2016
Accepted
16 May 2016
First published
16 May 2016

J. Mater. Chem. A, 2016,4, 9614-9624
Article type
Paper

Efficient ceria nanostructures for enhanced solar fuel production via high-temperature thermochemical redox cycles

X. Gao, A. Vidal, A. Bayon, R. Bader, J. Hinkley, W. Lipiński and A. Tricoli, J. Mater. Chem. A, 2016, 4, 9614
DOI: 10.1039/C6TA02187E

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