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NiSx/NiO/MoS2 heterostructure for enhanced hydrogen evolution in acidic media and supercapacitor electrode applications
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DOI：10.1039/D5RA06931A.png)
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Abstract
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This study demonstrates the synthesis and characterization of a NiSx/NiO/MoS2 (x = 1; 2) heterostructure using a hydrothermal method; demonstrating superior performance for the hydrogen evolution reaction (HER) in 1 M H2SO4. X-ray diffraction (XRD) confirmed the presence of cubic NiO; mixed NiS and NiS2 phases; and hexagonal MoS2; while scanning electron microscopy (SEM) revealed an interconnected nanosheet morphology with Ni; S; Mo; and O elements verified by energy-dispersive X-ray (EDX) spectroscopy. Fourier-transform infrared (FTIR) spectroscopy identified Ni–O; Ni–S; and Mo–S bonds; and UV-visible spectroscopy indicated a reduced bandgap of 2.81 eV for the composite. The composite achieved a low overpotential of 166 mV at 10 mA cm−2; a Tafel slope of 55 mV dec−1; and a charge transfer resistance of 52 Ω; outperforming individual NiO (582 mV; 91 mV dec−1; 266 Ω) and NiSx (357 mV; 72 mV dec−1; 170 Ω). Additionally; the composite exhibited a high specific capacitance of 428.24 F g−1 at 2 A g−1 and an electrochemical surface area (ECSA) of 0.7 mF cm−2; highlighting its potential as a dual-functional material for HER and supercapacitor applications. These results underscore the effectiveness of synergistic interactions in enhancing catalytic activity and charge storage capacity; offering a promising pathway for sustainable energy technologies.
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