Electrochemical characterization of single-layer MnO2 nanosheets as a high-capacitance pseudocapacitor electrode

Morphology and crystallinity-controlled synthesis of manganese cobalt oxide/manganese dioxides hierarchical nanostructures for high-performance supercapacitors

“…Up to now, MnO 2 with diverse structures and morphologies (such as nanosheets [4], hollow nanospheres [5], nanoflowers [6], nanowires/nanorods [7,8], thin films [9], and nanotubes [10]) and different crystalline phases (such as a [11], b [12], g [13], and d [14]) have been fabricated via electrochemical and chemical routes, and their electrochemical properties have been investigated. These studies indicate that the outstanding nanostructures and crystalline phases of the MnO 2 materials have been regarded as critical factors to influence their properties.…”

Ultrathin amorphous manganese dioxide nanosheets synthesized with controllable width

“…The worldwide interest in MnO 2 continues to increase due to its low cost, abundance, and ecofriendliness. 5,9 Twodimensional crystals of MnO 2 are generally peeled off from a layered bulk material by a mechanical or a chemical method. 7,8 Generally the procedures to synthesize MnO 2 nanosheets are multi-step processes (Fig.…”

Solvothermal synthesis of shape-controlled manganese oxide materials and their electrochemical capacitive performances

“…22 In addition, as we know, hierarchical microspheres assembled from small nanostructured particles have been reported to exhibit distinctive properties-different from those of the constituent nanoparticles-with various potential applications 23 ; therefore, the creation of such a shape of MnO 2 is of great significance. Several types of morphologies of MnO 2 materials have been previously reported including nanotubes, nanorods, nanowires, nanosheets, and nanoparticles 10,21,[24][25][26] ; however, to the best of our knowledge, spinel-type MnO 2 microspheres (MS-MnO 2 ) constructed from small nanoparticles have not been investigated. In this paper, we report a simple and quick procedure for the one-pot synthesis of manganese oxides under a basic solvothermal condition in the presence of a cationic surfactant acting as a template in a 2-butanol/water solution for the direct synthesis of spinel-type MS-MnO 2 comprising small MnO 2 nanoparticles.…”