Highly efficient electrocatalysts for oxygen reduction based on 2D covalent organic polymers complexed with...

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Covalent organic polymers (COPs) are a versatile class of materials with tunable properties.
• Developing efficient and stable electrocatalysts for oxygen reduction reactions (ORR) is crucial for energy applications.
• Metal-incorporation into COPs offers a pathway to enhance their catalytic activity.

Purpose of the Study:

• To synthesize 2D covalent organic polymers (COPs) incorporating transition metals (Fe, Co, Mn) with controlled nitrogen heteroatoms and holes.
• To investigate the electrocatalytic activity of these metal-COPs for oxygen reduction reactions (ORR).
• To evaluate the stability and resistance to poisoning effects of the synthesized electrocatalysts.

Main Methods:

• Synthesis of metal-incorporated COPs using N-containing metal-organic complexes and a nickel-catalyzed Yamamoto reaction.
• Carbonization of metal-COPs to form COP-derived graphene analogues.
• Electrochemical characterization of the materials as electrocatalysts for ORR in alkaline and acid media.

Main Results:

• Successfully synthesized 2D COPs with precisely located metals, nitrogen heteroatoms, and holes.
• COP-derived graphene analogues exhibited efficient electrocatalytic activity for ORR.
• The electrocatalysts showed good stability and were free from methanol crossover and CO poisoning effects.

Conclusions:

• Metal-incorporated COPs and their derived graphene analogues are promising electrocatalysts for ORR.
• The controlled structure of these materials contributes to their enhanced performance and stability.
• These findings open new avenues for designing advanced catalysts for energy conversion devices.