Nanotubes of NiCo

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Efficient and cost-effective catalysts are crucial for water splitting.
• Developing electrocatalysts for hydrogen evolution reaction (HER) under alkaline conditions remains a challenge.

Purpose of the Study:

• To synthesize and evaluate a novel NiCo2 S4 /Co9 S8 nanotube heterostructure as an electrocatalyst for HER in alkaline media.
• To investigate the structure-activity relationship of the synthesized materials.

Main Methods:

• Hydrothermal synthesis of NiCo2 S4 , Co9 S8 , and NiCo2 S4 /Co9 S8 nanotubes.
• Electrochemical characterization using cyclic voltammetry and linear sweep voltammetry in 1.0 M KOH.
• Evaluation of hydrogen gas evolution rate.

Main Results:

• The NiCo2 S4 /Co9 S8 heterostructure exhibited superior HER activity compared to individual NiCo2 S4 and Co9 S8 nanotubes.
• The heterostructure achieved a current density of 10 mA cm⁻² at an overpotential of -0.172 V vs. RHE.
• A hydrogen gas evolution rate of 2.29 μmol min⁻¹ was recorded for the NiCo2 S4 /Co9 S8 heterostructure.

Conclusions:

• The NiCo2 S4 /Co9 S8 nanotube heterostructure is a highly efficient electrocatalyst for HER in alkaline conditions.
• The synergistic effect between NiCo2 S4 and Co9 S8 , along with the nanotube morphology, enhances charge transport and catalytic activity.
• This development offers a promising pathway towards cost-effective hydrogen production via water splitting.