Enhancing NiS performance: Na-doping for advanced photocatalytic and electrocatalytic applications

Area of Science:

• Materials Science
• Catalysis
• Environmental Chemistry

Background:

• Alkali metal doping is an emerging strategy to boost the catalytic performance of nickel sulfide (NiS).
• Understanding the influence of specific dopants, like sodium (Na), on NiS properties is crucial for catalyst development.

Purpose of the Study:

• To investigate the structural, electronic, and photo/electrocatalytic effects of sodium doping on NiS.
• To evaluate the performance of Na-doped NiS (Na-NiS) for 2,4-dichlorophenol (2,4-DCP) degradation and water splitting.

Main Methods:

• Synthesis and characterization of Na-NiS nanoparticles.
• Photocatalytic degradation experiments of 2,4-DCP under visible light.
• Electrochemical measurements for hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and overall water splitting.

Main Results:

• Na-doping significantly altered NiS lattice structure and surface chemistry, increasing the bandgap.
• Na-NiS achieved 98.5% degradation of 2,4-DCP under visible light due to enhanced light absorption and charge separation.
• Electrochemical tests showed low overpotentials for HER (336 mV) and OER (350 mV), with overall water splitting at 2.61 V.

Conclusions:

• Na-NiS demonstrates significant potential as a dual-functional catalyst for environmental remediation and clean energy production.
• The study highlights the effectiveness of sodium doping in optimizing NiS-based catalysts for diverse applications.
• Further research into doped transition metal sulfides can lead to advanced catalytic materials.