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Phase I biotransformation reductive reactions are chemical processes that modify drugs by introducing or revealing polar functional groups via reduction. Enzymes called reductases catalyze these reactions, playing a pivotal role in drug metabolism by transforming lipophilic drugs into more polar, water-soluble metabolites for easy excretion. An essential type of reductive reaction is the carbonyl group reduction, where aldehydes and ketones are reduced to alcohols. An example is the...
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Updated: Feb 3, 2026

Author Spotlight: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange
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Nonpyrolyzed Fe-N Coordination-Based Iron Triazolate Framework: An Efficient and Stable Electrocatalyst for Oxygen

Zheng-Hong Huang1, Nan-Hong Xie1, Min Zhang1

  • 1Innovative Catalysis Program, Key Lab of Organic Optoelectronics & Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing, 100084, China.

Chemsuschem
|October 20, 2018
PubMed
Summary

Nonpyrolyzed iron triazolate frameworks (FeTa2) show efficient and stable oxygen reduction reaction (ORR) catalysis in alkaline media. This study highlights Fe-N coordination sites in intact FeTa2 as active centers for ORR, outperforming other nonpyrolyzed MOFs.

Keywords:
electrocatalysisheterogeneous catalysisironmetal-organic frameworksoxygen reduction reaction

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Pyrolyzed metal-organic frameworks (MOFs) with FeNx coordination are known catalysts for the oxygen reduction reaction (ORR).
  • Nonpyrolyzed MOFs with Fe-N coordination have not been previously explored for ORR catalysis.

Purpose of the Study:

  • To investigate the catalytic performance of a nonpyrolyzed iron triazolate framework (FeTa2) for ORR in alkaline electrolyte.
  • To evaluate the effect of conductive carbon (Ketjenblack carbon, KB) on the FeTa2 catalyst's ORR performance.
  • To identify the active sites responsible for the ORR catalysis.

Main Methods:

  • Synthesis and characterization of FeTa2-xKB composites (x = KB/FeTa2 weight ratio).
  • Electrochemical testing for ORR activity using onset and half-wave potentials.
  • Material characterization using elemental analysis, FTIR spectroscopy, XPS, and cyclic voltammetry.
  • Accelerated durability testing to assess catalytic stability.

Main Results:

  • FeTa2-xKB composites demonstrated superior ORR performance compared to most nonpyrolyzed MOFs.
  • N-FeIII-OH- sites on the FeTa2 surface were identified as the active catalytic sites.
  • The FeTa2 catalyst exhibited highly stable ORR activity over 20,000 cycles (approx. 90 hours).
  • The framework structure of FeTa2 remained intact during durability testing.

Conclusions:

  • Nonpyrolyzed Fe-N coordination-based MOFs, specifically FeTa2, can efficiently catalyze the ORR in alkaline electrolytes.
  • The intact framework structure of FeTa2 contributes to its excellent catalytic durability.
  • This work presents the first demonstration of efficient and stable ORR catalysis using a nonpyrolyzed Fe-N coordination-based MOF.