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The oxygen-releasing step in the water splitting cycle by MnFe2O4-Na2CO3 system

TitoloThe oxygen-releasing step in the water splitting cycle by MnFe2O4-Na2CO3 system
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione2009
AutoriSeralessandri, L., Bellusci M., Padella F., Santini A., and Varsano F.
RivistaInternational Journal of Hydrogen Energy
Parole chiaveCarbon dioxide, Coexistence regions, Experimental conditions, Ferrite, Ferrites, Gas producers, Hydrogen production, Isomers, Manganese, Manganese compounds, Manganese ferrite, Oxygen, Phase diagrams, Phase identifications, Rietveld analysis, Rietveld method, Sodium, Sodium compounds, Solid phasis, Sustainable hydrogen production, Thermal cycling, Thermochemical water splitting, Water analysis, Water splitting cycles, X ray diffraction, XRD, Xrd analysis

Investigation of the feasibility of the thermochemical two-step water splitting cycle based on MnFe2O4/Na2CO3 system is reported. Influence of temperature and carbon dioxide pressure on the oxygen-releasing step was investigated. XRD analysis was applied to obtain phase identification of reacted powders at investigated experimental conditions. Different sodium sub-stoichiometric Na1-δ(Mn1/3Fe2/3)O2-δ/2 compounds were observed and their structure determined by using Rietveld analysis. Selected experimental conditions permitted to define a T / pCO2 phase diagram, showing different solid phases coexistence regions. Experimental conditions that permit complete regeneration of the initial MnFe2O4/Na2CO3 mixture were identified (field I in the reported diagram), demonstrating the possibility of full chemical cyclical operation of the system. © 2008 International Association for Hydrogen Energy.


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Citation KeySeralessandri20094546