Blue TiO nanosheets as a high-performance electrode material for supercapacitors.

We are reporting the use of blue titanium oxide (b-TiO) nanostructures as advanced electrode material for high performance supercapacitor for the first time. A one-pot hydrothermal route was employed for the oxidation of layered titanium diboride (TiB) into b-TiO nanosheets. The b-TiO nanosheets are prepared via hydrothermal oxidation of TiB. Physico-chemical characterizations such as X-ray diffraction, UV-visible, photoluminescence spectroscopy, electron spin resonance spectroscopy, laser Raman spectrum, X-ray photoelectron spectroscopy, and morphological studies revealed the formation of sheet-like b-TiO nanostructures. The energy storage properties of the b-TiO electrode were examined using aqueous and organic electrolytes. The cyclic voltammetry and charge-discharge analysis of b-TiO electrode using 1 M NaSO revealed their pseudocapacitive nature with a high specific capacitance (∼19 mF cm). The b-TiO based symmetric supercapacitor (SSC) device using organic liquid (1 M TEABF) works over a wide operating potential window (3 V) and delivered a high specific capacitance (6.67 F g or 3.58 mF cm), possess high energy density and power density with excellent cyclic stability over 10,000 cycles. Collectively, these studies demonstrated the usefulness of b-TiO as a novel electrode material for high performance supercapacitor.