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Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
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Bimetallic Covalent Organic Frameworks for Constructing Multifunctional Electrocatalyst.

Dekun Wu1,2, Qing Xu1, Jing Qian1

  • 1CAS Key Laboratory of Low-Carbon Conversion Science and Engineering, Shanghai Advanced Research Institute (SARI), Chinese Academy of Sciences (CAS), Shanghai, 201210, P. R. China.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|December 12, 2018
PubMed
Summary

This study presents a novel electrochemical catalyst derived from bimetallic covalent organic frameworks (COFs). This catalyst demonstrates exceptional performance in oxygen reduction and hydrogen evolution reactions, offering a promising alternative to platinum-based catalysts.

Keywords:
bimetallic electrochemical catalystscovalent organic frameworkselectrochemistrymultifunctional catalystsoxygen reduction reactions

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Covalent organic frameworks (COFs) are versatile crystalline porous polymers.
  • COFs serve as excellent precursors for heteroatom-doped porous carbons.
  • Developing efficient catalysts for energy storage and conversion is crucial.

Purpose of the Study:

  • To synthesize a multifunctional electrochemical catalyst from a bimetallic COF.
  • To evaluate the catalyst's performance in oxygen reduction (ORR), hydrogen evolution (HER), and oxygen evolution (OER).

Main Methods:

  • Pyrolysis of a bimetallic COF to create a hierarchical porous carbon structure.
  • Embedding iron and cobalt nanoparticles within the carbon matrix.
  • Electrochemical characterization of the catalyst's activity for ORR, HER, and OER.

Main Results:

  • The catalyst exhibits excellent ORR activity with a 50 mV positive half-wave potential compared to Pt-C.
  • Superior HER performance with low overpotentials (-0.26 V in acid, -0.33 V in alkali) at 10 mA cm⁻².
  • Efficient OER catalysis with an overpotential of 1.59 V at 10 mA cm⁻².

Conclusions:

  • The pyrolyzed bimetallic COF-derived catalyst shows high efficiency and stability for key electrochemical reactions.
  • This material presents a promising, cost-effective alternative to precious metal catalysts for energy applications.