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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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.
|Title:||The Cobalt-oxide/Iron-oxide Binary System for Use as High Temperature Thermochemical Energy Storage Material|
|Date:||10 February 2014|
|Journal or Publication Title:||Thermochimica Acta|
|In Open Access:||No|
|In ISI Web of Science:||Yes|
|Page Range:||25 -32|
|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|
|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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