Reduced graphene oxides embedded zeolitic imidazolate framework-8 and copper sulfide as electrodes for asymmetric supercapacitors and hydrogen evolution reactions (original) (raw)

Journal of Energy Storage, 2025

Abstract

Developing electrode materials with interconnected channels and a sufficient specific surface area for energy storage and electrochemical water splitting implementation as supercapacitors and hydrogen evaluation reaction (HER) holds great potential but is still challenging. Integrating reduced graphene oxide (rGO) with metal sulfides and metal-organic frameworks (MOF) has shown exciting potential for enhancing electrochemical performance. In this research, we prepared zeolitic imidazolate framework-8 (ZIF-8) and copper sulfide (CuS) nanostructure to compare their performance in supercapacitors and HER. Pristine ZIF-8 and CuS demonstrated storage capacities of 1115C/g and 1479C/g, respectively. Upon doped ZIF-8/CuS with rGO at fix percentage ratio to further improve performance. The resulting rGO@ZIF-8/CuS composites, estimated in a three-electrode setup, achieved an outstanding specific capacity of 2180C/g. Fabricated electrode were employed to construct a novel super- capattery (rGO@ZIF-8/CuS//AC), which showcased exceptional electrochemical interpretation through a ca- pacity of 250C/g in two electrode system. The rGO@ZIF-8/CuS composite also transported a remarkable energy density (Ed) of 70 Wh/kg and a power density (Pd) of 1400 W/kg. The asymmetric supercapacitor exhibited exceptional cycling performance, retaining 91 % of its initial capacitance and maintaining a Coulombic efficiency of 95 % after 1000 charge-discharge cycles. The assembled electrode showed 140 mV overpotential and 58.3 mV/dec Tafel slope from the HER process.

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