![]() ![]() The ion conductivity of the electrolytes proved to be the main factor for the enhancement of the surface controlled capacitance of ß-MnO2 as the temperature increased. Due to its high specific surface area, abundant pores, interconnected structure, as well as a great length/diameter ratio, the as-prepared ß-MnO2, in 0.5 M Na2SO4, exhibits a good electrochemical performance at a wide temperature range of 5-80 ☌. Porous nanospheres self-assembled from nanowires interconnecting with each other to form 3D hierarchical mesoporous networks of beta-MnO2 (ß-MnO2) are successfully prepared, with a high yield, at room temperature with a template-free approach. The amphoteric semiconducting behavior, along with the PEC properties markedly dependent on the deposit nanoscale organization, open interesting avenues to an eventual implementation of the target materials in view of sustainable applications. The obtained α-Mn3O4 nanodeposits were ultimately tested as catalysts in the photoelectrochemical (PEC) splitting of water under simulated solar illumination, with particular focus on the interplay relationships between the adopted preparative conditions and the resulting functional performances. Materials were grown in a N2+O2 atmosphere in the presence of water vapor, investigating the influence of growth temperature and total pressure on the system structural, compositional, morphological and optical properties through a multi-technique characterization approach. In the present work, α-Mn3O4 (hausmannite) nanostructured films were fabricated by chemical vapor deposition (CVD) on indium tin oxide- (ITO-) coated glass substrates from a β-diketonate-diamine Mn(II) precursor. ![]()
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