Non-Metal Single-Phosphorus-Atom Catalysis of Hydrogen Evolution

Area of Science:

• Materials Science
• Catalysis
• Electrochemistry

Background:

• Non-metal-based single-atom catalysts (SACs) present cost-effective and tunable alternatives to traditional catalysts.
• Developing highly dispersed single-atom catalysts is crucial for optimizing catalytic efficiency.

Purpose of the Study:

• To synthesize and characterize a novel non-metal single-atom phosphorus catalyst on a unique molybdenum carbide support.
• To evaluate the electrocatalytic performance of the new catalyst for the hydrogen evolution reaction (HER).

Main Methods:

• A simplified pressurized gas-assisted process was employed for catalyst synthesis.
• The catalyst's structure and composition were analyzed using advanced characterization techniques.
• Electrocatalytic activity for HER was assessed through electrochemical measurements.

Main Results:

• The first non-metal single-atom phosphorus catalyst (SAP-Mo2C-CS) with atomic-level dispersion on single-crystal Mo2C hexagonal nanosheet arrays was successfully synthesized.
• The SAP-Mo2C-CS catalyst demonstrated exceptional stability and electrocatalytic activity for HER.
• The catalyst exhibited a near-zero Gibbs free energy of hydrogen adsorption (ΔG_H*), indicating an ideal active site for hydrogen evolution.

Conclusions:

• The developed SAP-Mo2C-CS catalyst represents a significant advancement in non-metal-based SACs for HER.
• The catalyst's unique structure and electronic properties facilitate highly efficient hydrogen evolution.
• The moderate d-band center of the catalyst provides a new benchmark for evaluating HER performance in non-metal catalysts.