Hydrothermal synthesis of porous K+-containing flower-like delte MnO2 with high specific capacitance

作者：Wang, Li; Wang, Hui^*

来源：Micro & Nano Letters, 2017, 12(9): 670-674.

DOI：10.1049/mnl.2017.0249

• manganese compounds
• nanoporous materials
• porosity
• nanofabrication
• liquid phase deposition
• scanning electron microscopy
• transmission electron microscopy
• nitrogen
• adsorption
• desorption
• voltammetry (chemical analysis)
• electrochemical electrodes
• capacitance
• electrolytes
• X-ray diffraction
• current density
• capacitors
• hydrothermal synthesis
• porous K+-containing flower-like delte MnO2
• thin two-dimensional nanosheets
• flower-like morphology
• delte-type crystal
• porous structure

In this study, porous K+-containing flower-like delte-MnO2 constructed by numerous thin two-dimensional nanosheets was fabricated by a hydrothermal procedure. Its flower-like morphology was revealed by scanning electron microscopy. The construction units, the ultrathin sheets, were observed from transmission electron microscopy. Its delte-type crystal was characterised via X-ray diffraction. Its porous structure was convinced through N-2 adsorption-desorption isotherms. The properties of delte-MnO2 nanoflowers as an active electrode constituent for electrochemical capacitors were examined by cyclic voltammetry and galvanostatic charge-discharge in 1 mol l(-1) Na2SO4 electrolyte, and a specific capacitance of 227.2 F g(-1) was obtained at a current density of 0.05 A g(-1). The obtained delte-MnO2 shows a good long-term stability, suggesting it is a potential electrode material for capacitors.

• 出版日期2017-9
• 单位平顶山学院; 西北师范大学