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Solar thermochemical hydrogen production using ceria zirconia solid solutions: Efficiency analysis

Bulfin, Brendan and Lange, Matthias and de Oliveira, Lamark and Roeb, Martin and Sattler, Christian (2016) Solar thermochemical hydrogen production using ceria zirconia solid solutions: Efficiency analysis. International Journal of Hydrogen Energy, 41, pp. 19320-19328. Elsevier. DOI: 10.1016/j.ijhydene.2016.05.211 ISSN 0360-3199

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Official URL: http://www.sciencedirect.com/science/article/pii/S0360319916307650

Abstract

In this work thermochemical hydrogen production using ceria zirconia redox materials of the form Ce1�xZrxO2, with x varied in the range 0e0.2, is investigated. A number of literature sources are used to fix the thermodynamic properties such as the partial molar entropies and enthalpies of reduction. From this, a full thermodynamic analysis of the fuel production is possible, where the heat required was assumed to be supplied by concentrated solar power. An efficiency model is presented and the materials are compared. The extent of reduction for a given temperature and oxygen partial pressure increases with increasing Zr concentration. However, the addition of Zr also has a negative effect on the oxidation reaction, requiring lower temperature oxidation and thus a larger temperature swing between the reaction steps. The thermodynamic analysis suggests that for cycles with a reduction temperature of 1773 K, the improvement in yield offered by Ce1�xZrxO2 does improve the efficiency, with Ce0.8Zr0.2O2 having the highest solar to fuel production efficiency of the materials considered. To achieve this efficiency the oxidation would need to be performed at lower temperature (�800 �C for Ce0.8Zr0.2O2) than is common in experimental demonstrations, and may be kinetically limited.

Item URL in elib:https://elib.dlr.de/108157/
Document Type:Article
Title:Solar thermochemical hydrogen production using ceria zirconia solid solutions: Efficiency analysis
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bulfin, Brendanbrendan.bulfin (at) dlr.deUNSPECIFIED
Lange, MatthiasMatthias.Lange (at) dlr.dehttps://orcid.org/0000-0003-4747-0010
de Oliveira, Lamarklamark.de-oliveira (at) dlr.deUNSPECIFIED
Roeb, Martinmartin.roeb (at) dlr.deUNSPECIFIED
Sattler, ChristianChristian.Sattler (at) dlr.dehttps://orcid.org/0000-0002-4314-1124
Date:11 June 2016
Journal or Publication Title:International Journal of Hydrogen Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:41
DOI :10.1016/j.ijhydene.2016.05.211
Page Range:pp. 19320-19328
Publisher:Elsevier
ISSN:0360-3199
Status:Published
Keywords:Cerium dioxide, Thermochemical cycle, Solar fuel, Ceria, Zirconia, CSP, Solar hydrogen
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Solar Fuels
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Solar Fuels (old)
Location: Jülich , Köln-Porz
Institutes and Institutions:Institute of Solar Research > Solare Verfahrenstechnik
Deposited By: Sattler, Prof. Dr. Christian
Deposited On:24 Nov 2016 14:54
Last Modified:24 Nov 2016 14:54

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