Interface-Engineered RuP₂/Mn₂P₂O₇ Heterojunction on N/P Co-Doped Carbon for High-Performance Alkaline Hydrogen...

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Efficient and durable electrocatalysts are vital for sustainable hydrogen production via the hydrogen evolution reaction (HER).
• Developing cost-effective alternatives to precious metal catalysts like platinum is a key challenge in electrocatalysis.

Purpose of the Study:

• To design and synthesize a novel heterojunction electrocatalyst for the alkaline HER.
• To investigate the enhanced catalytic activity and durability of the proposed material.

Main Methods:

• A controlled pyrolysis-phosphidation strategy was employed to synthesize the RuP2/Mn2P2O7 heterojunction on a nitrogen and phosphorus co-doped porous carbon framework (RuP2/Mn2P2O7/NPC).
• Electrochemical characterization techniques were used to evaluate the HER performance in 1 M KOH.

Main Results:

• The RuP2/Mn2P2O7/NPC catalyst demonstrated high HER activity, requiring a low overpotential of 69 mV to achieve 10 mA·cm−2 with a Tafel slope of 69 mV·dec−1.
• The catalyst exhibited excellent stability, with negligible activity loss over 48 hours of operation.
• The phosphorus doping effectively modulated the electronic structure at the heterojunction interface, enhancing electron transfer and catalytic kinetics.

Conclusions:

• The RuP2/Mn2P2O7/NPC heterojunction is a highly efficient and durable electrocatalyst for the alkaline HER, comparable to commercial Pt/C.
• This work presents a viable strategy for designing transition metal phosphide heterostructures with tunable electronic properties for advanced energy conversion applications.