Antiferroelectric SnO₂ Network with Amorphous Surface for Electrochemical N₂ Fixation

Area of Science:

• Electrochemistry
• Materials Science
• Catalysis

Background:

• Electrochemical nitrogen fixation offers sustainable ammonia (NH3) production.
• Current catalysts face limitations in nitrogen (N2) adsorption, hindering efficiency.

Purpose of the Study:

• To improve N2 adsorption and activation for enhanced electrochemical ammonia synthesis.
• To leverage the antiferroelectric properties of SnO2 for catalyst design.

Main Methods:

• Fabrication of a 3D porous SnO2 network with amorphous surfaces.
• Utilizing antiferroelectric SnO2 to create dipole-dipole interactions with N2.
• Employing experimental and first-principles calculations for analysis.

Main Results:

• The SnO2 catalyst demonstrated enhanced N2 adsorption and activation.
• Achieved high NH3 production rate (57.38 µg h⁻¹mg⁻¹ cat) and Faradaic efficiency (33.26%).
• Significantly improved N2 utilization and active site accessibility.

Conclusions:

• Antiferroelectric SnO2 provides a novel strategy for designing efficient electrocatalysts.
• This work establishes a framework for gas-involved electrocatalyst development.
• Pioneers integrated strategies for sustainable nitrogen utilization.