| Abstract
| - A low temperature (60 or 95 °C), “one-pot” procedure for aqueous precipitation of layered manganese oxide core@shell particles is developed, based on the reaction between MnO4− and Mn2+. Characterization of the particles was carried out using powder XRD, nitrogen adsorption−desorption, FESEM, TEM, and electron diffraction. Textural and morphological tailoring is achieved through various experimental parameters, with the specific surface area adjusted between 15 and 110 m2 g−1 while a ball-like or sheetlike shape is selectively obtained. The synthesis is based on a two-step precipitation process, with the first stage involving in situ seeding and enabling shape control via adjustment of the initial acidity. Hierarchical core−corona particles are obtained through a second slower heterogeneous nucleation stage, controlled by reactant ratio, aging time, temperature, and acidity of the aging medium.
- A low-temperature aqueous route toward oxide@oxide materials is developed. This process is applied to layered manganese oxides and shown to provide versatile control of the final particle shape and the texture of the resulting material. Key parameters for efficient tailoring are highlighted and related to a mechanism involving two kinetic pathways.
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