Controlled synthesis of nanostructured manganese oxide: crystalline evolution and catalytic activities

Merging of Kirkendall Growth and Ostwald Ripening: CuO@MnO2 Core-shell Architectures for Asymmetric Supercapacitors

“…5a), in agreement with other reports394950. As reported previously5152, the average oxidation state of Mn in manganese oxides can be determined by the energy separation of Mn 3 s peaks. The CuO@MnO 2 hybrid structures exhibit a separated energy of 4.8 eV for the Mn 3 s doublet (Fig.…”

High-performance of bare and Ti-doped α-MnO2 nanoparticles in catalyzing the Oxygen Reduction Reaction

“…To our best knowledge [8,16,17], the a-MnO 2 polymorph is the most active towards oxygen reduction reaction and its controlled synthesis is still a current research interest [13]. Furthermore, as already stated in the literature [12,18] …”

“…As widely reported in literature, nanostructured MnO 2 can be synthesized by either electrochemical [9] and chemical [10e12] processes. Among these synthetic protocols, the wet route is commonly used for the preparation of manganese dioxide [13]. In particular, the effects of pH, concentrations [14], temperature [11,15], reactants [10], counter cations and anions [12] have been widely studied in order to obtain products with different behaviors, morphological structures (e.g.…”

Preparation and Characterization of Different Loading of Zinc Oxide on Activated Carbon Nanofibers

“…As can be seen in Figure 3(a), there are five major peaks can be detected in both NF0 and NF5 that represent different vibrations existed in the NFs prior activation. However, there is one high peak was detected at wavenumber 445.7 cm -1 in NF5 that represents Zn-O vibrations [11,12]. Nevertheless, the appearance of unknown peak around wavenumber 400 -700 cm -1 in Figure 3 is believed due to the existence of other vibrations that overlapped at the same wavenumber range such as C-C, C-N, and C-O.…”

“…It can be seen that prior activation, the structure of the NFs is amorphous and after activation, the structure become more crystalline. As shown in Figure 4(a), the obvious peak detected at 16.7 o in NF0 represents the polymer PAN peak [12] while the other two sharp peaks that only appeared in NF5 at 31.85 and 36.3 o represents the ZnO peaks. However, in Figure 4(b), the polymer peak changed to carbon peak after activation and it was detected at 13.2 o [13].…”