Structural Regulation of a Multi-Component Co₂P₂O₇-MoN/NC Electrocatalyst for Efficient Oxygen Evolution Reaction

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Developing efficient and durable non-precious metal electrocatalysts for the oxygen evolution reaction (OER) is crucial for energy conversion technologies.
• Existing catalysts often face challenges in terms of activity, stability, and cost.

Purpose of the Study:

• To synthesize and characterize a novel multi-component composite for enhanced OER performance.
• To investigate the synergistic effects of different components in the composite for improved electrocatalytic activity and durability.

Main Methods:

• A facile two-step synthesis method was employed to prepare the Co2P2O7-MoN/NC composite.
• Electrochemical characterizations, including overpotential, Tafel slope, and long-term stability tests, were conducted in an alkaline solution.
• Post-synthesis characterizations were performed to understand the structural and chemical changes.

Main Results:

• The Co2P2O7-MoN/NC composite exhibited superior OER activity, requiring an overpotential of 278 mV at 10 mA cm⁻² and a Tafel slope of 83.3 mV dec⁻¹.
• The catalyst demonstrated excellent long-term stability, maintaining performance for over 100 hours in an alkaline solution.
• Synergistic effects between Co2P2O7, MoN, N-doped carbon, and newly formed CoOOH nanosheets were identified as key to the enhanced performance.

Conclusions:

• The multi-component Co2P2O7-MoN/NC composite presents a promising non-precious metal electrocatalyst for OER.
• Structural reconstruction and synergistic effects play a vital role in promoting OER performance.
• This study offers a viable strategy for designing efficient transition-metal-based electrocatalysts for energy conversion applications.