Dual-Function Electrocatalytic Activity Unleashed by FeMo-Graphdiyne@Ni₃S₂ with Engineered Heterointerfaces

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Developing efficient electrocatalysts for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is crucial for renewable energy technologies.
• Polyoxometalate (POM)-derived sulfides and graphdiyne (GDY) are promising materials, but their synergistic integration requires further investigation.

Purpose of the Study:

• To construct sp-C-S-M heterointerfaces between metal sulfides (Fe3S4 and MoS2) and GDY.
• To investigate the enhanced bifunctional OER and HER electrocatalytic activity resulting from these heterointerfaces.
• To elucidate the roles of electronic interactions and interfacial architecture in boosting catalytic performance.

Main Methods:

• In situ growth of graphdiyne (GDY) on polyoxometalate (POM)-derived sulfide surfaces.
• Fabrication of sp-C-S-M heterointerfaces using Fe3S4 and MoS2.
• Electrocatalytic performance evaluation for OER and HER, including overpotential measurements at 10 mA cm-2.

Main Results:

• The constructed heterointerfaces significantly enhanced synergistic interactions between POM-derived sulfides and GDY.
• Rapid charge transfer and an increased number of active sites were observed, boosting intrinsic catalytic activity.
• The catalyst achieved low overpotentials of 132 mV for HER and 218 mV for OER at 10 mA cm-2.

Conclusions:

• The study demonstrates that electronic interactions and interfacial architecture are critical for enhancing HER and OER activities.
• The developed sp-C-S-M heterointerfaces offer a promising strategy for designing high-performance bifunctional electrocatalysts.
• This work provides valuable insights into the rational design of advanced catalytic materials for energy conversion.