Fabricating Black-Phosphorus/Iron-Tetraphosphide Heterostructure via a Solid-Phase Solution-Precipitation Method for...

Area of Science:

• Materials Science
• Catalysis
• Electrochemistry

Background:

• Heterostructures are key to enhancing catalyst activity but often involve complex preparation and low yields.
• Developing efficient and scalable synthesis methods for advanced catalysts remains a significant challenge.

Purpose of the Study:

• To develop a high-yield, interface-intensive heterostructure synthesis method inspired by solid-phase solution-precipitation (SPSP).
• To prepare and evaluate a black-phosphorus/iron-tetraphosphide (BP/FeP4) heterostructure for catalytic applications, specifically the nitrogen reduction reaction (NRR).

Main Methods:

• Mechanochemical synthesis using solid-phase ball milling under high transient pressure.
• Electrocatalytic evaluation of the synthesized BP/FeP4 heterostructure for the nitrogen reduction reaction (NRR).
• Experimental investigation and density-functional theory (DFT) calculations to understand catalytic mechanisms.

Main Results:

• Successfully synthesized BP/FeP4 heterostructures with high yield using a mechanochemical SPSP-inspired approach.
• Achieved excellent NRR performance with an NH3 yield of 77.6 µg h⁻¹ and a Faradic efficiency of 62.9% at -0.2 V.
• DFT calculations revealed that excess phosphorus in the heterostructure is crucial for NRR activity by facilitating N2 activation.

Conclusions:

• The SPSP-inspired mechanochemical approach provides a simple, low-cost, and high-yield method for preparing advanced heterostructure catalysts.
• The developed BP/FeP4 heterostructure demonstrates superior catalytic activity for NRR, highlighting its potential for efficient ammonia synthesis.
• This work offers a new perspective for designing and synthesizing highly efficient catalysts through interface engineering.