Morphology controlled synthesis of Mn2V2O7 nanoparticles: Hydrothermal reaction time dependent electrochemical performance for hybrid supercapacitor application

Abstract

Different nanostructures of Mn2V2O7 (MVO) were synthesized in the present study via a facile hydrothermal route by simply varying the reaction time for 6, 12, 18 and 24 h, and referred to as MVO-6 h, MVO-12 h, MVO-18 h and MVO-24 h, respectively. Several analytical techniques, including XRD, XPS, SEM, TEM, and BET, were used to investigate the structural, morphological and surface characteristics. The electrochemical properties were thoroughly investigated utilizing CV, GCD and EIS revealed that MVO-18 h electrode has a higher specific capacity of 327.3 C g−1 at 1 A g−1 than those of MVO-6 h (113.3 C g−1), MVO-12 h (205.7 C g−1) and MVO-24 h (270.6 C g−1) electrodes. The interconnecting nano pebbles-like morphology of the MVO-18 h sample with more void spaces boosts its electrical conductivity and accelerates the ion transport, resulting in enhanced electrochemical activity. A hybrid supercapacitor (HSC) MVO-18 h//AC exhibited a specific capacity of 192 C g−1 at 1 A g−1 and 61.8 C g−1 at 5 A g−1, high energy density of 44.3 Wh kg−1 at a power density of 807.4 W kg−1 with an excellent cycle stability over 10,000 cycles.