NiS@CuBi₂O₄/ERGO heterostructured electro-catalyst for enhanced hydrogen evolution reaction

In this study, nickel sulfide (NiS)-decorated copper bismuthate/electro-reduced graphene oxide nanocomposites (NiS@CuBi2O4/ERGO) were fabricated on nickel foam (NF) electrodes by a twostep synthesis method including electrochemical deposition technique and thermally annealing. The prepared electrode materials were characterized using XRD, XPS, EDS, and SEM techniques. The NiS@CuBi2O4/ERGO electrode was used as a promising electrocatalyst for hydrogen evolution reaction (HER). The resulting electrode exhibited superb electrocatalytic activity, probably originating from more active sites and a higher electron transfer rate than the NF. HER activity of the electrode was investigated in 0.5 M H2SO4 solution and had an overpotential of 210 mV at the current density of 10 mA cm(-2). Thanks to the NiS decoration, the HER stability of the thin films in the acidic environment has shown a remarkable improvement. Moreover, the electrocatalyst material, produced using a simple method, retained its activity by about similar to 71% after stability tests at 100 mA cm(-2).

Journal

MICRO AND NANOSTRUCTURES

Year

2023

Volume

183

eISSN

2773-0123

DOI

10.1016/j.micrna.2023.207666

WoS UID

WOS:001077634700001