Hybrid supercapacitor with nano-TiP2O7 as intercalation electrode

Abstract Nano-size (≤100 nm) TiP 2 O 7 is prepared by the urea assisted combustion synthesis, at 450 and 900 °C. The compound is characterized by powder X-ray diffraction, Rietveld refinement, high resolution transmission electron microscopy and surface area methods. Lithium cycling properties by way of galvanostatic cycling and cyclic voltammetry (CV) showed a reversible and stable capacity of 60 (±3) mAh g −1 (0.5 mole of Li) up to 100 cycles, when cycled at 15 mA g −1 between 2–3.4 V vs. Li. Non-aqueous hybrid supercapacitor, TiP 2 O 7 (as anode) and activated carbon (AC) (as cathode) has been studied by galvanostatic cycling and CV in the range, 0–3 V at 31 mA g −1 and exhibited a specific discharge capacitance of 29 (±1) F g −1 stable in the range, 100–500 cycles. The Ragone plot shows a deliverable maximum of 13 Wh kg −1 and 371 W kg −1 energy and power density, respectively.