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Cobalt-based ferrites as efficient redox materials for thermochemical two-step CO2 splitting: enhanced performance due to cation diffusion

Abstract

Thermochemical two-step CO2 splitting under concentrated solar energy has received numerous attentions, and ferrite is a promising material for such a redox reaction. However, their application is still challenged by sintering problem due to the inevitably high operating temperature. Herein, we report the non-stoichiometric cobalt-based ferrites, with no thermostable supports employed, as efficient redox materials for thermochemical two-step CO2 splitting. In the comparison with ZrO2- and Al2O3-added CoFe2O4, CoO-added CoFe2O4 (CoFe2O4/CoO) shows a CO productivity of 8.5 mL g-1, which is 1.5 and 3.2 times higher than that of CoFe2O4/ZrO2 (5.4 mL g-1) and CoFe2O4/Al2O3 (2.6 mL g-1), respectively. Based on the characterization of morphological and crystal structures by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), mössbauer spectroscopy and fourier transformed infrared spectroscopy (FT-IR), the ferrites were thoroughly ananlyzed and thereby a bulk cation diffusion for CoFe2O4/CoO over the reaction is kinetically demonstrated to play an important role in enhancing the performance.

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Publication details

The article was received on 11 Dec 2018, accepted on 09 Feb 2019 and first published on 11 Feb 2019


Article type: Paper
DOI: 10.1039/C8SE00611C
Citation: Sustainable Energy Fuels, 2019, Accepted Manuscript

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    Cobalt-based ferrites as efficient redox materials for thermochemical two-step CO2 splitting: enhanced performance due to cation diffusion

    J. Huang, Y. Fu, S. Li, W. Kong, 军. 张 and Y. Sun, Sustainable Energy Fuels, 2019, Accepted Manuscript , DOI: 10.1039/C8SE00611C

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