Phase and microstructure control of electrodeposited Manganese Oxide with enhanced optical properties

Mn3O4 and Mn2O3 were synthesized by potentiostatic electrodeposition from a de-aerated manganese acetate sodium sulfate electrolytic bath, followed annealing. The parameters (including applied potential, precursor concentration, pH, temperature) the thermal treatment conditions investigated to obtain best control over microstructure stoichiometry of oxides. We found that voltage is key parameter affecting valence state initial amorphous while leads crystallization tuning optical properties without substantially changing morphology. as-electrodeposited oxides are X-rays amorphous, two different crystalline phases, Mn2O3, obtained after depending on voltage. Through analysis TEM cross section images, fiber-like growth was observed for Mn3O4, presented less porous-more compact microstructure. investigated, resulting in an enhancement charge separation thermally treated oxides, reflected nearly 40 % reduction photoluminescence peak intensity. believe these finding will be useful future development environmental friendly oxide-based photoelectrochemical systems.