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Lili Li1, Binbin Wang1, Hongni Chen1

  • 1State Key Laboratory of Bio-fibers and Eco-textiles, Collaborative Innovation Center of Shandong Marine Biobased Fibers and Ecological Textiles, Institute of Marine Biobased Materials, College of Materials Science and Engineering, Qingdao University, Qingdao, 266071, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|December 20, 2024
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This study introduces novel organogel polymers for efficient oxygen reduction reactions (ORR). Shortening alkyl sidechains enhances catalytic activity, yielding high selectivity for hydrogen peroxide production.

Keywords:
active siteelectrocatalysisgel catalystshydrogen peroxideorganic polymer

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Polymer gels offer chemical stability and self-sustaining properties, making them attractive for electrocatalysis.
  • Organic polymer gels with temperature sensitivity and specific liquid inclusions enhance conductivity and morphology but are underexplored for oxygen reduction reaction (ORR).
  • Existing metal-free carbon-based electrocatalysts have limitations in ORR efficiency and selectivity.

Purpose of the Study:

  • To develop novel organogel polymers as efficient electrocatalysts for the oxygen reduction reaction (ORR).
  • To investigate the synergistic effect of mainchain rigidity and alkyl sidechain length on catalyst performance.
  • To achieve high selectivity for hydrogen peroxide (H2O2) production during the 2-electron ORR.

Main Methods:

  • Synergistic modulation of mainchain molecular skeleton rigidity and alkyl sidechain length in organogel polymers.
  • Development of organogel polymers exhibiting temperature-sensitive sol-gel phase transitions.
  • Electrocatalytic evaluation of synthesized organogel polymers for ORR in alkaline medium.
  • Theoretical calculations to identify active sites.

Main Results:

  • Shortening alkyl sidechains significantly impacts gelation, microstructure, and electron states, enhancing catalytic activity.
  • Phenyl-containing Ph-FL1 organogel with short alkyl sidechains demonstrated outstanding 2-electron ORR activity.
  • Achieved 98.6% selectivity for hydrogen peroxide (H2O2) with a yield of 4.08 mol g-1 h-1.
  • Performance surpasses most existing metal-free carbon-based ORR electrocatalysts.

Conclusions:

  • Organogel polymers with tailored sidechain lengths are promising metal-free electrocatalysts for ORR.
  • The C═N group's carbon atom (site-3) is identified as a key active site through theoretical calculations.
  • This work represents a significant advancement in designing cost-effective and efficient ORR electrocatalysts, particularly for H2O2 production.