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Hierarchically Ordered Macro-Mesoporous Electrocatalyst with Hydrophilic Surface for Efficient Oxygen Reduction

Wen Yao1, Anqian Hu1, Jieting Ding1

  • 1State Key Laboratory of Pulp and Paper Engineering, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510640, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|April 17, 2023
PubMed
Summary

This study introduces a novel method to create advanced metal-organic frameworks (MOFs) for catalysis. The resulting functionalized MOFs yield highly active cobalt catalysts with improved structures for liquid-phase reactions.

Keywords:
hierarchical poresmetal-organic frameworksordered macroporesoxygen reduction reactionwettability

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Area of Science:

  • Materials Science
  • Catalysis
  • Electrochemistry

Background:

  • Metal-organic frameworks (MOFs) are versatile precursors for supported metal catalysts.
  • Microporous structures and poor wettability of MOF-derived catalysts limit their performance in liquid-phase reactions.

Purpose of the Study:

  • To develop a functionalized MOF with a hierarchical hollow-wall and 3D-ordered macroporous (H-3DOM) structure.
  • To synthesize cobalt supported on oxygen/nitrogen-co-doped carbon composites (Co/ONC) with H-3DOM structures and enhanced wettability.
  • To evaluate the electrocatalytic performance of the synthesized material for the oxygen reduction reaction (ORR).

Main Methods:

  • An etching-functionalization strategy using tannic acid was employed to create the H-3DOM MOF precursor.
  • The functional MOF was used to synthesize H-3DOM-Co/ONC composites.
  • Electrochemical techniques were used to assess the catalytic activity for the oxygen reduction reaction.

Main Results:

  • The H-3DOM structure significantly increased the external surface area, maximizing active site exposure.
  • Oxygen-containing functional groups enhanced surface wettability, improving electrochemical accessibility in aqueous electrolytes.
  • The resulting H-3DOM-Co/ONC catalyst demonstrated superior electrocatalytic activity for the oxygen reduction reaction compared to control materials.

Conclusions:

  • The developed etching-functionalization strategy successfully created MOFs with H-3DOM structures.
  • The H-3DOM-Co/ONC material exhibits excellent performance in the oxygen reduction reaction due to its unique structure and surface properties.
  • This approach offers a promising pathway for designing high-performance catalysts for liquid-phase reactions.