Ultrafine nano-network structured bacterial cellulose as reductant and bridging ligands to fabricate ultrathin K-birnessite type MnO2 nanosheets for supercapacitors
Abstract In this work, nanostructured ultrathin K-birnessite type MnO 2 nanosheets are successfully prepared by a rapid and environmently friendly hydrothermal method, which involves only a facile redox reaction between KMnO 4 and nano-network structured bacterial cellulose with abundant hydroxyl groups. The results show that the unique three-dimensional interwoven structured bacterial cellulose acts as not only reductant but also bridging ligands for assembling nanoscaled building units to control the desired morphology of prepared MnO 2 . Furthermore, electrochemical performances of prepared MnO 2 are investigated as electrode materials for supercapacitors by cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectrum in 1.0M Na 2 SO 4 electrolyte. The resulting ultrathin K-birnessite type MnO 2 nanosheets based electrode exhibits higher capacitance (328.2Fg −1 at 0.2Ag −1 ), excellent rate capability (328.2Fg −1 and 200.4Fg −1 at 0.2Ag −1 and 2.0Ag −1 , respectively) and satisfactory cyclic stability (91.6% of initial capacitance even after 2000 cycles at 3.0Ag −1 ). This work suggests that bacterial cellulose as reductant is a promising candidate in the development of nanostructures of metal oxides. Highlights Bacterial cellulose was firstly used as reductant for synthesis of δ-MnO 2 . Bacterial cellulose also tuned the morphology of prepared nanostructured δ-MnO 2 . Ultrathin K-birnessite type MnO 2 nanosheets were successfully prepared. As-prepared K-birnessite type MnO 2 exhibited satisfactory capacitive behavior. Graphical abstract [DISPLAY OMISSION] Shown in figure was the introduction of preparation and characterization of ultrathin K-birnessite type MnO 2 nanosheets.
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