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The Cobalt-oxide/Iron-oxide Binary System for Use as High Temperature Thermochemical Energy Storage Material

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.

Document Type:Article
Title:The Cobalt-oxide/Iron-oxide Binary System for Use as High Temperature Thermochemical Energy Storage Material
Authors:
AuthorsInstitution or Email of Authors
Block, TinaWF-KSW
Knoblauch, NicoleWF-KSW
Schmücker, MartinWF-KSW
Date:10 February 2014
Journal or Publication Title:Thermochimica Acta
Refereed publication:Yes
In 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
HGF - Program Themes:Energy-efficient Processes
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Thermochemische Prozesse
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Keramische Strukturwerkstoffe
Deposited By: Tina Block
Deposited On:24 Feb 2014 08:04
Last Modified:24 Feb 2014 08:04

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