Bhat, K.S.Nagaraja, H.S.2026-02-052021International Journal of Hydrogen Energy, 2021, 46, 7, pp. 5530-55363603199https://doi.org/10.1016/j.ijhydene.2020.11.133https://idr.nitk.ac.in/handle/123456789/23389Electrochemical hydrogen-storage is one of the prominent energy storage systems. In this work, the hydrothermally synthesized copper sulfide (Cu<inf>2</inf>S) revealed a unique morphology of micro-hexagons as envisioned through scanning electron microscopy measurements. Electrochemical hydrogen storage (EHS) performance was evaluated using various electrochemical techniques, such as cyclic voltammetry, galvanostatic charge-discharge, and impedance spectroscopy measurements. The hydrogen discharge capacity of ~59.32 mAh g?1 was obtained at an applied current density of 1 A g?1. Further, the analysis of the charge-storage mechanism indicates foremost contributions from the redox processes. The prominent hydrogen storage performance is complimented with reasonable cyclic retention for 2500 cycles. © 2020 Hydrogen Energy Publications LLCCopper compoundsCopper metallographyCyclic voltammetryElectric dischargesElectrochemical impedance spectroscopyHydrogen sulfideScanning electron microscopySulfide mineralsSulfur compoundsElectrochemical hydrogen storageElectrochemical hydrogen storage performanceElectrochemical techniquesEnergy storage systemsGalvanostatic charge dischargesHydrothermally synthesizedImpedance spectroscopy measurementsStorage performanceHydrogen storage