Fine Characterization of Co/Fe-Based Materials: Insights into the Influence of Cation Ratios Between 2/2 and 10/2 on Obtaining Layered Double Hydroxides
Almaza Abi Khalil, Stéphanie Betelu, Sandrine Delpeux, Corinne Bouillet, Nicolas Maubec, Fabrice Muller, Alain Seron
TL;DR
This paper studies how varying cobalt and iron ratios affects the formation of layered double hydroxides, revealing insights into their structure and properties.
Contribution
The study provides a detailed characterization of Co/Fe LDHs using multiple techniques, revealing how cation ratios and pH influence phase formation.
Findings
Well-crystallized LDHs were synthesized except for the 2/2 ratio at pH 11.5, which produced byproducts.
A pH of 8.0 yielded quasi-hexagonal LDH particles with high purity and consistent composition.
Rietveld refinement confirmed LDH phases in the range of 95–98% for most compositions.
Abstract
Co/Fe layered double hydroxides (LDHs) are among the most promising materials for advanced industrial and energy applications. Controlling the synthesis conditions of LDH materials is thus crucial to precisely tailoring cation composition and distribution, thereby regulating surface charge, ion sorption, and electron transfer required for optimal chemical and electrochemical performance. Therefore, characterizing Co/Fe precipitates (chemical composition, purity, morphology, and crystallinity) is also required to further exploit their controlled properties. Thus, solids with Co/Fe cation ratios between 2/2 and 10/2 were synthesized under an air atmosphere, at pH 8 or 11.5. For the first time, multiscale physicochemical techniques (FTIR, TEM-EELS, SEM, AAS, TGA, CHN elemental analysis, and XRD complemented by Rietveld refinement) were used to provide a fully documented characterization of…
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Taxonomy
TopicsLayered Double Hydroxides Synthesis and Applications · Supercapacitor Materials and Fabrication · Iron oxide chemistry and applications