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Silica-supported Zr-doped cobalt ferrite complex oxides, Co1−2xZrxFe2O4/SiO2 (0⩽x⩽0.15) were prepared via a simple sol–gel auto-combustion method using aqueous silica colloid as the silica source. The products were used as reactive materials in two-step thermochemical cycles for CO2 splitting. Compared to undoped cobalt ferrite, the Zr-doped ones can significantly enhance the rates of the reduction...
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