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We developed novel isoindigo-based covalent organic networks for efficient electrocatalysis. The planar I-TTA material demonstrates superior performance in both oxygen and hydrogen evolution reactions, showing robust stability for energy applications.

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Covalent organic frameworksElectrocatalysisIsoindigoWater splitting

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Developing efficient electrocatalysts for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is crucial for energy storage and conversion.
  • Current challenges include achieving low cost, robustness, and high performance under both acidic and basic conditions.

Purpose of the Study:

  • To synthesize and characterize novel imine-linked isoindigo-based covalent organic networks (CONs).
  • To investigate the effect of core amine unit planarity on material morphology and electrocatalytic activity.
  • To evaluate the performance of synthesized materials as electrocatalysts for OER and HER.

Main Methods:

  • Synthesis of two CONs, I-TTA (planar triazine core) and I-TG (non-planar guanidinium core), via imine linkage.
  • Characterization of material morphology, crystallinity, and electrochemical properties.
  • Electrocatalytic testing for HER and OER in acidic and basic electrolytes, respectively.

Main Results:

  • I-TTA formed a 2D nanosheet covalent organic framework (COF) with high crystallinity, while I-TG formed an amorphous covalent organic polymer (COP) with fibrous morphology.
  • I-TTA exhibited superior electrocatalytic activity for both HER (134 mV overpotential for 10 mA cm⁻² current density in H₂SO₄) and OER (283 mV overpotential in KOH).
  • I-TTA demonstrated OER activity surpassing other metal-free COFs and maintained stability over 24 hours and 500 cycles.

Conclusions:

  • The planarity of the core amine unit significantly influences the structure and electrocatalytic performance of isoindigo-based CONs.
  • The crystalline, planar I-TTA COF is a promising metal-free electrocatalyst for efficient and stable OER and HER.
  • This work offers a new strategy for designing high-performance electrocatalysts for renewable energy technologies.