Hierarchical ITO nanofibers coated Mn₃O₄ nanoplates core-shell nanocomposites for high performance all-solid-state symmetric supercapacitor device

We have made a first attempt to build a novel Tin doped indium oxide@Manganese oxide (ITO@Mn₃O₄) nanocomposite electrode to overcome the detriments of Mn₃O₄ such as low conductivity and small potential window. Herein, we have synthesized the ITO@Mn₃O₄ nanocomposite by growing Mn₃O₄ nanoplates over ITO nanofibers synthesized by electrospinning technique. Benefitted from, the high conductivity and negative operating potential window of ITO exceptionally increased in the electrochemical performance of ITO@Mn₃O₄ was observed. The specific capacitance of optimized ITO@Mn₃O₄ nanocomposite reached up to 823 F/g at 1 mA/cm² in a wide potential window of 2 V using Na₂SO₄ electrolyte. To determine the practical feasibility an ITO@Mn₃O₄//ITO@Mn₃O₄ all-solid-state symmetric device was developed, which operated very well in a 2.2 V voltage window. It was found to deliver a maximum energy density of 88 Wh/kg and a power density of 550 W/kg. This novel composite inferred the significance of using simple design to build a high-performance device.