Tunable composition of NiII–AlIII and NiII–FeIII layered hydroxides within a wide range of layer charge

In this paper we investigated the particular behaviour of the nickel ion to serve as divalent cations for MII/FeIII and MII/AlIII layered double hydroxides. To this end, we showed by careful TEM/EDX, PXRD and infrared analysis the possibility to accurately tune the composition of Ni-based layered double hydroxides in the range 0.09 ≤ MIII/(NiII + MIII) ≤ 0.33. The morphology of the crystals was strongly correlated to the net charge of the layer. Finally, we confirmed the trends of structural parameters observed in literature for other MII/MIII LDHs synthesized in narrower ranges of composition.

Composition of carbonate NiII layered double hydroxides with FeIII or AlIII as MIII cations have been accurately tuned in the large range 0.09 ≤ x = MIII/(NiII + MIII) ≤ 0.33.Figure optionsDownload as PowerPoint slide