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

Thermochemical two-step CO2 splitting under concentrated solar energy has received significant attention, and ferrites are promising materials for such a redox reaction. However, their application is still challenged by the sintering problem due to the inevitably high operating temperature. Herein,...

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Bibliographic Details
Published in:Sustainable energy & fuels 2019, Vol.3 (4), p.975-984
Main Authors: Huang, Jincheng, Fu, Yu, Li, Shuqing, Kong, Wenbo, Zhang, Jun, Sun, Yuhan
Format: Article
Language:English
Subjects:
Aluminum oxide
Carbon dioxide
Cations
Cobalt
Cobalt ferrites
Crystal structure
Diffusion
Fourier transforms
Infrared analysis
Infrared spectroscopy
Morphology
Mossbauer spectroscopy
Operating temperature
Performance enhancement
Photoelectron spectroscopy
Photoelectrons
Raman spectroscopy
Scanning electron microscopy
Solar energy
Spectroscopy
Spectrum analysis
Splitting
Structural analysis
X ray photoelectron spectroscopy
X-ray diffraction
Zirconium dioxide
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Summary:Thermochemical two-step CO2 splitting under concentrated solar energy has received significant attention, and ferrites are promising materials for such a redox reaction. However, their application is still challenged by the sintering problem due to the inevitably high operating temperature. Herein, we report non-stoichiometric cobalt-based ferrites, with no thermostable supports employed, as efficient redox materials for thermochemical two-step CO2 splitting. In 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 morphological and crystal structure characterization by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), Mössbauer spectroscopy and Fourier transform infrared spectroscopy (FT-IR), the ferrites were thoroughly analyzed and thereby bulk cation diffusion for CoFe2O4/CoO over the reaction is kinetically demonstrated to play an important role in enhancing the performance.
ISSN:2398-4902
DOI:10.1039/c8se00611c