Document Type

Article

Publication Date

4-17-2024

Abstract

Water splitting stands out as an optimal technology to address the continually growing energy demands. This field has garnered considerable attention, with numerous materials being scrutinized for their potential applications. Among these, the family of nickel-based sulfides emerges as a noteworthy example, showcasing intriguing properties pertinent to water-splitting endeavors. In this study, a methodical and uncomplicated approach for synthesizing nickel sulfides is proposed. The process initiates with the creation of nickel disulfide (NiS2) hollow microspheres through a hydrothermal procedure. Subsequently, meticulous temperature regulation in a specific atmosphere lead to the preparation of porous hollow microspheres of nickel sulfide (NiS). The effectiveness of NiS2 in the hydrogen evolution reaction (HER) is demonstrated, exhibiting impressive performance in both acidic and alkaline environments. In acidic conditions, an overpotential of 174 mV is required to attain a current density of 10 mA/cm2, with a Tafel slope of only 63 mV/dec. Similarly, in alkaline conditions, an overpotential of 148 mV achieves a current density of 10 mA/cm2, accompanied by a Tafel slope of 79 mV/dec. Meanwhile, NiS proves to be adept in the oxygen evolution reaction (OER), displaying a low overpotential of 320 mV to achieve a current density of 10 mA/cm2, marking it as a commendable catalyst. These findings inspire the construction of an efficient water-splitting system, incorporating NiS2 as the HER catalyst in a cathode and NiS as the OER catalyst in an anode. The resulting system exhibits high activity and robust stabilization. Notably, it maintains a stable current density of 10 mA/cm2 at an applied voltage of 1.58 V, presenting itself as a noteworthy electrolyzer for water splitting.

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