Design of Hierarchical core-corona architectures of layered manganese oxides by aqueous precipitation
作者： David Portehault , Sophie Cassaignon , Emmanuel Baudrin , Jean-Pierre Jolivet
DOI: 10.1021/CM801400B
关键词: Precipitation (chemistry) 、 Aqueous solution 、 Electron diffraction 、 Nucleation 、 Chemical engineering 、 Nitrogen 、 Materials science 、 Seeding 、 Manganese 、 Inorganic chemistry 、 Specific surface area
摘要: 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 was carried out using powder XRD, nitrogen adsorption−desorption, FESEM, TEM, electron diffraction. Textural morphological tailoring achieved through various experimental parameters, with specific surface area adjusted 15 110 m2 g−1 while a ball-like sheetlike shape selectively obtained. The synthesis two-step process, first stage involving in situ seeding enabling control via adjustment initial acidity. Hierarchical core−corona are obtained second slower heterogeneous nucleation stage, controlled by reactant ratio, aging time, temperature, acidity medium.
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