Co-precipitation synthesized nanostructured Ce_0.9Ln0.₀₅Ag0.₀₅O_2−δ materials for solar thermochemical conversion of CO₂ into fuels

Synthesis, characterization, and application of Ce_0.9Ln0.₀₅Ag0.₀₅O_2−δ materials (where, Ln = La, Pr, Nd, Sm, Gd, Tb, Dy, Er) for the thermochemical conversion of CO2 reported in this paper. The Ce_0.9Ln0.₀₅Ag0.₀₅O_2−δ materials were synthesized by using an ammonium hydroxide-driven co-precipitation method. The derived Ce_0.9Ln0.₀₅Ag0.₀₅O_2−δ materials were characterized via powder X-ray diffraction, scanning electron microscope, and electron diffraction spectroscopy. The characterization results indicate the formation of spherically shaped Ce_0.9Ln0.₀₅Ag0.₀₅O_2−δ nanostructured particles. As-prepared Ce_0.9Ln0.₀₅Ag0.₀₅O_2−δ materials were further tested toward multiple CO₂ splitting cycles by utilizing a thermogravimetric analyzer. The results obtained indicate that all the Ce_0.9Ln0.₀₅Ag0.₀₅O_2−δ materials produced higher quantities of O₂ and CO than the previously studied pure CeO₂ and lanthanide-doped ceria materials. Overall, the Ce_0.911La₀.₀₅₃Ag_0.047O1.925 showed the maximum redox reactivity in terms of O₂ release (72.2 μmol/g cycle) and CO production (136.6 μmol/g cycle).

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Published in: Journal of Materials Science
License: https://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1007/s10853-020-04567-w