2D heterogeneous vanadium compound interfacial modulation enhanced synergistic catalytic hydrogen evolution for full...

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Developing efficient electrocatalysts is crucial for sustainable hydrogen production.
• MXene-based materials show promise but require further optimization for challenging environments like seawater electrolysis.

Purpose of the Study:

• To synthesize and characterize a novel VS2@V2C electrocatalytic material.
• To evaluate its performance in hydrogen evolution reaction (HER) across various electrolytes, including seawater.
• To understand the structure-property relationships governing its catalytic activity.

Main Methods:

• One-step hydrothermal synthesis of VS2@V2C composite.
• Electrochemical characterization including overpotential and Tafel slope measurements.
• First-principles calculations to investigate electronic properties and adsorption energies.

Main Results:

• VS2@V2C exhibited low overpotentials and Tafel slopes in both acidic and alkaline media.
• Achieved high-efficiency and stable seawater electrolysis at current densities >100 mA cm-2.
• Demonstrated superior catalytic performance compared to platinum-based alloys.
• Calculations confirmed enhanced carrier mobility and favorable hydrogen adsorption/desorption.

Conclusions:

• The VS2@V2C composite is a highly effective electrocatalyst for hydrogen production from seawater.
• Its unique structure facilitates charge transfer and optimizes hydrogen evolution kinetics.
• This work provides a valuable framework for designing advanced industrial catalysts for green hydrogen generation.