Optimizing Interfacial Charge Dynamics and Quantum Effects in Heterodimensional Superlattices for Efficient Hydrogen...

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Superlattice materials offer tunable properties for water electrocatalysis.
• Transition metal superlattices face limitations in hydrogen evolution reaction (HER) activity due to electronic structure constraints.

Purpose of the Study:

• To design a highly efficient electrocatalyst for HER using a VS2-VS heterodimensional superlattice.
• To address limitations in charge carrier mobility and active site availability in superlattice catalysts.

Main Methods:

• Fabrication of a VS2-VS heterodimensional (2D-1D) superlattice.
• Introduction of sulfur vacancies to engineer electronic properties.
• Theoretical calculations and experimental validation of catalytic performance.

Main Results:

• The engineered heterojunction in the VS2-VS superlattice promotes efficient electron-hole separation.
• Sulfur vacancies induce quantum localization of electrons, enhancing HER activity.
• Achieved a ΔGH* of -0.06 eV and an overpotential of 46 mV at 10 mA·cm−2, outperforming commercial Pt/C.

Conclusions:

• Advanced material engineering of superlattices is crucial for developing efficient electrocatalysts.
• The VS2-VS superlattice with sulfur vacancies represents a promising catalyst for sustainable hydrogen production.
• Demonstrated exceptional stability over 15,000 cycles, highlighting practical applicability.