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Electrochemically Driven Water Oxidation by a Highly Active Ruthenium-Based Catalyst.

Andrey Shatskiy1, Andrey A Bardin1,2, Michael Oschmann1

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Summary

A new ruthenium-based water oxidation catalyst, [RuX (mcbp)(OHn )(py)2 ], achieves high activity comparable to state-of-the-art catalysts. This efficient catalyst is generated stoichiometrically under mild conditions from a RuII precursor.

Keywords:
artificial photosynthesiselectrocatalysishomogeneous catalysisrutheniumwater oxidation

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Area of Science:

  • Inorganic Chemistry
  • Catalysis
  • Electrochemistry

Background:

  • Water oxidation is a key process in artificial photosynthesis and renewable energy.
  • Ruthenium complexes are promising catalysts for water oxidation but often require harsh conditions or exhibit limited stability.
  • Developing efficient and stable water oxidation catalysts (WOCs) under mild conditions remains a significant challenge.

Purpose of the Study:

  • To synthesize and characterize a novel ruthenium-based water oxidation catalyst, [RuX (mcbp)(OHn )(py)2 ].
  • To investigate the generation of catalytically active Ru-aqua species from precursor complexes under mild conditions.
  • To evaluate the electrocatalytic activity and efficiency of the new catalyst for water oxidation.

Main Methods:

  • Synthesis and isolation of RuII and RuIII precursor complexes.
  • Characterization using single-crystal X-ray analysis, NMR, UV/Vis, EPR, FTIR spectroscopy, ESI-HRMS, and elemental analysis.
  • Electrochemical and spectroscopic studies of redox properties and electrocatalytic water oxidation activity.

Main Results:

  • Stoichiometric generation of the active Ru-aqua complex [RuX (mcbp)(OHn )(py)2 ] from a RuII precursor was achieved at pH 7.0.
  • The catalyst demonstrated a maximum turnover frequency (TOFmax) of approximately 40,000 s-1 at pH 9.0.
  • The catalytic activity is comparable to state-of-the-art ruthenium catalysts like [RuIV (tda)(O)(py)2 ].

Conclusions:

  • The novel ruthenium complex [RuX (mcbp)(OHn )(py)2 ] is a highly active and efficient water oxidation catalyst.
  • Mild and stoichiometric generation of the active species is possible, overcoming limitations of previous catalysts.
  • This catalyst represents a significant advancement in the field of water oxidation catalysis for energy applications.