Open AccessHydrothermal synthesis of porous K + ‐containing flower‐like delte MnO 2 with high specific capacitance
Author(s) -
Wang Li,
Wang Hui
Publication year - 2017
Publication title -
micro and nano letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.25
H-Index - 31
ISSN - 1750-0443
DOI - 10.1049/mnl.2017.0249
Subject(s) - cyclic voltammetry , capacitance , transmission electron microscopy , materials science , scanning electron microscope , electrolyte , electrode , supercapacitor , electrochemistry , hydrothermal circulation , hydrothermal synthesis , analytical chemistry (journal) , capacitor , desorption , chemical engineering , porosity , adsorption , nanotechnology , chemistry , composite material , voltage , chromatography , electrical engineering , engineering
In this study, porous K + ‐containing flower‐like delte‐MnO 2 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‐MnO 2 nanoflowers as an active electrode constituent for electrochemical capacitors were examined by cyclic voltammetry and galvanostatic charge–discharge in 1 mol l −1 Na 2 SO 4 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‐MnO 2 shows a good long‐term stability, suggesting it is a potential electrode material for capacitors.