Anandan Vannathan, A.Chandewar, P.R.Shee, D.Mal, S.S.2026-02-042022Journal of the Electrochemical Society, 2022, 169, 5, pp. -134651https://doi.org/10.1149/1945-7111/ac6c58https://idr.nitk.ac.in/handle/123456789/22576Two different polyoxovanadates derivatives, K5MnIVV11O32.10 H2O (MnV11) and K7MnIVV13O38.18 H2O (MnV13), have been studied to evaluate their electrochemical performance. These polyoxovanadates were deposited on activated carbon (AC) to prepare AC-MnV11 and AC-MnV13 composites. The electrochemical performance of the AC-MnV11 electrode exhibits the remarkable specific capacitance of 479.73 F g-1 at a current density of 0.6 A g-1, along with incredible specific power and energy of 960 W kg-1. Likewise, the AC-MnV13 exhibits a specific capacitance of 357.33 F g-1 at the current density of 0.6 A g-1 with a specific energy of 71.46 Wh kg-1. Interestingly, the AC-MnV11 could light up the red and yellow color LED bulbs for a duration of 80 and 60 s, respectively, indicating a considerable specific power of the material. The AC-MnV13 electrode shows significantly less lighting up during the 65 and 30 s period with red and yellow LED bulbs. © 2022 The Electrochemical Society ("ECS"). Published on behalf of ECS by IOP Publishing Limited.CapacitanceElectrochemical electrodesHybrid materialsLight emitting diodesManganese compoundsCarbon-basedElectrochemical performanceHigh performance electrochemical capacitorsHybrids materialPolyoxovanadatesSpecific capacitanceSpecific energySpecific powerActivated carbon