Accelerating the decomposition of KMnO4 by photolysis and auto-catalysis: a green approach to synthesize a layered birnessite-type MnO2 assembled hierarchical nanostructure

作者：Hu, Xiaonan; Shi, Liyi; Zhang, Dengsong^*; Zhao, Xin; Huang, Lei^*

来源：RSC Advances, 2016, 6(17): 14192-14198.

DOI：10.1039/c5ra22668f

• MANGANESE OXIDE
• HIGH-PERFORMANCE
• SUPERCAPACITOR ELECTRODE
• HYDROTHERMAL SYNTHESIS
• AQUEOUS-SOLUTION
• NANOSHEETS
• DEGRADATION
• COMPOSITES
• MORPHOLOGY
• NANOTUBES

In this work, we developed a facile, green and low-cost strategy for the controllable synthesis of birnessite-type MnO2 (Bir-MnO2) nanosheets assembled in a "desert rose"-like 3D hierarchical nanostructure and proposed a two-step growth route, namely photolysis and followed by auto-catalytic decomposition of KMnO4. Bir-MnO2 nanosheets were first obtained under the irradiation of a light source and acted as seeds for further decomposition of the excess MnO4- in the dark. The sizes of the Bir-MnO2 3D hierarchical nanostructures could be readily controlled by varying the concentration of KMnO4, the light source and the pH value. Furthermore, Bir-MnO2 nanosheets on CNTs were successfully fabricated utilizing the same strategy without the addition of any surfactants or organic templates. It is anticipated that the fabrication of Bir-MnO2 based nanostructures and composites could be beneficial from this universal method.

• 出版日期2016
• 单位上海大学