Block, Tina and Knoblauch, Nicole and Schmücker, Martin (2014) The Cobalt-oxide/Iron-oxide Binary System for Use as High Temperature Thermochemical Energy Storage Material. Thermochimica Acta (577), 25 -32. Elsevier. DOI: 10.1016/j.tca.2013.11.025 ISSN 0040-6031
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Abstract
The use of thermochemical reactions is a promising approach for heat storage applications. Redox-reactions involving multivalent cations are recently envisaged for high temperature applications. In temperature range of 900-1000 °C, however, where heat storage required for concentrated solar power (CSP) processes only few metal oxides with sufficient heat storage capabilities do exist. Binary systems, on the other hand, could provide a wider range of suitable materials. In the present experimental study the cobalt-oxide/iron-oxide binary system is investigated. For pure iron-oxide the transformation of Fe2O3/Fe3O4 occurs at 1392 °C with a reaction enthalpy of 599 J/g. The reaction temperature, however, is far too high for CSP applications. Cobalt-oxide, on the other hand, reacts from Co3O4/CoO at 915 °C with an enthalpy of 576 J/g. Iron-doped cobalt-oxides transform at similar temperature as pure cobalt-oxide but the reaction enthalpy gradually decreases with increasing iron content. Microstructural stability and related long-term reversibility of the chemical reaction, however, is higher with respect to pure cobalt-oxide. Compositions of around 10 % iron-oxide were identified having appropriate enthalpies and being beneficial in terms of microstructural stability.
Item URL in elib: | https://elib.dlr.de/86214/ | ||||||||||||
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Document Type: | Article | ||||||||||||
Title: | The Cobalt-oxide/Iron-oxide Binary System for Use as High Temperature Thermochemical Energy Storage Material | ||||||||||||
Authors: |
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Date: | 10 February 2014 | ||||||||||||
Journal or Publication Title: | Thermochimica Acta | ||||||||||||
Refereed publication: | Yes | ||||||||||||
Open Access: | No | ||||||||||||
Gold Open Access: | No | ||||||||||||
In SCOPUS: | Yes | ||||||||||||
In ISI Web of Science: | Yes | ||||||||||||
DOI : | 10.1016/j.tca.2013.11.025 | ||||||||||||
Page Range: | 25 -32 | ||||||||||||
Publisher: | Elsevier | ||||||||||||
ISSN: | 0040-6031 | ||||||||||||
Status: | Published | ||||||||||||
Keywords: | Thermochemical Energy Storage, CoxFe3-xO4, Cobalt-oxide, Iron-oxide, Redox-reactions, Microstructure | ||||||||||||
HGF - Research field: | Energy | ||||||||||||
HGF - Program: | Efficient Energy Conversion and Use (old) | ||||||||||||
HGF - Program Themes: | Energy-efficient Processes (old) | ||||||||||||
DLR - Research area: | Energy | ||||||||||||
DLR - Program: | E EV - Energy process technology | ||||||||||||
DLR - Research theme (Project): | E - Thermochemische Prozesse (old) | ||||||||||||
Location: | Köln-Porz | ||||||||||||
Institutes and Institutions: | Institute of Materials Research > Keramische Strukturwerkstoffe | ||||||||||||
Deposited By: | Block, Tina | ||||||||||||
Deposited On: | 24 Feb 2014 08:04 | ||||||||||||
Last Modified: | 24 Feb 2014 08:04 |
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