Electrochemical hydrogen-storage performance of copper sulfide micro-hexagons

Electrochemical hydrogen-storage is one of the prominent energy storage systems. In this work, the hydrothermally synthesized copper sulfide (Cu2S) 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 s(p)ectroscopy measurements. The hydrogen discharge capacity of similar to 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. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

Copper sulfide with unique micro-hexagon morphology was synthesized hydrothermally and showed promising electrochemical hydrogen storage performance. The hydrogen discharge capacity reached approximately 59.32 mAh g(-1) at a current density of 1 A g(-1) with contributions from redox processes, indicating stable cyclic retention for 2500 cycles. Various electrochemical techniques, such as cyclic voltammetry, galvanostatic charge-discharge, and impedance spectroscopy, were used for performance evaluation.