Metal oxides for thermochemical energy storage - From gastriggered isothermal cycling to low-temperature applications with increased O₂ pressure

Autor(en)

Christian Knoll, Georg Gravogl, Werner Artner, Elisabeth Eitenberger, Gernot Friedbacher, Andreas Werner, Ronald Miletich, Peter Weinberger, Danny Müller, Michael Harasek

Abstrakt

Metal oxides providing various, reversibly accessible oxidation states are in the focus as auspicious materials for high-temperature thermochemical energy storage (TCES) materials. Among all principally suitable metal oxides due to equilibrium temperature and, in particular, reaction rate and reversibility, only the couple Co3O4 / CoO and to a smaller extend Mn2O3 / Mn3O4 are considered as suitable candidates. Based on recent studies on isothermal TCES-cycles, the impact of temperature and increased O2-pressure on the reaction rate was investigated by varying the O2-partial pressure in the low-temperature oxidation of the reduced oxide. Whereas Mn3O4 was found to react too slow for a process at lower temperatures, CoO was found suitable. For an increase of the O2 pressure to 6 bar between 500 - 550 °C an attractive oxidation behavior was observed. At 900 °C Co3O4 / CoO could be cycled within 4.5 minutes between both oxidation states by changing the atmosphere from N2 to O2 and vice versa.

Organisation(en)

Institut für Mineralogie und Kristallographie

Externe Organisation(en)

Technische Universität Wien

Anzahl der Seiten

10

DOI

https://doi.org/10.18086/swc.2017.14.02

Publikationsdatum

2017

Peer-reviewed

Ja

ÖFOS 2012

104003 Anorganische Chemie, 104011 Materialchemie, 105113 Kristallographie

Schlagwörter

ASJC Scopus Sachgebiete

Renewable Energy, Sustainability and the Environment

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/325c6159-e67f-4f95-8243-fbccbfdbb864