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Electrocatalytic Water Oxidation by a Tetranuclear Copper Complex.

Vijayendran K K Praneeth1, Mio Kondo1,2,3, Pei Meng Woi1,4

  • 1Institute for Molecular Science (IMS), 5-1 Higashiyama, Myodaiji, Okazaki, Aichi, 444-8787, Japan.

Chempluschem
|January 23, 2020
PubMed
Summary

Researchers developed a novel tetranuclear copper catalyst for efficient water oxidation. This homogeneous catalyst operates effectively in basic aqueous solutions, showcasing its potential for sustainable energy applications.

Keywords:
catalysiscopperhomogeneous catalysismultinuclear complexeswater splitting

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Area of Science:

  • Inorganic Chemistry
  • Catalysis
  • Electrochemistry

Background:

  • Water oxidation is a crucial process for renewable energy technologies.
  • Developing efficient and stable water oxidation catalysts is essential.
  • Multinucleating ligands offer unique coordination environments for metal complexes.

Purpose of the Study:

  • To design and synthesize a novel tetranuclear copper-based water oxidation catalyst.
  • To investigate the electrocatalytic activity of the synthesized complex.
  • To elucidate the catalytic mechanism and system behavior under reaction conditions.

Main Methods:

  • Synthesis of a novel tetranuclear copper complex using 1,3-bis(6-hydroxy-2-pyridyl)-1H-pyrazole ligand.
  • Electrocatalytic measurements for water oxidation at pH 12.5.
  • Spectroscopic analyses including UV/Vis absorption and energy-dispersive X-ray (EDX).
  • Electrochemical analyses to determine overpotential and catalytic behavior.

Main Results:

  • The tetranuclear copper complex exhibited electrocatalytic activity for water oxidation.
  • An overpotential of approximately 500 mV was observed under basic aqueous conditions (pH 12.5).
  • Spectroscopic and electrochemical data indicated homogeneous catalytic behavior.

Conclusions:

  • A discrete tetranuclear copper complex can function as an effective water oxidation catalyst.
  • The designed ligand facilitates the formation of an active multinuclear catalytic species.
  • This study highlights the potential of discrete multinuclear complexes in catalysis.