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Cobalt Schiff-base complexes for electrocatalytic hydrogen generation.

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Two cobalt(III) Schiff-base complexes efficiently catalyze proton reduction at low overpotentials. These inexpensive catalysts exhibit promising activity for electrochemical applications, with potential for high turnover frequencies.

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Area of Science:

  • Inorganic Chemistry
  • Electrochemistry
  • Catalysis

Background:

  • Proton reduction is a key reaction in sustainable energy technologies, such as water splitting.
  • Developing efficient and inexpensive electrocatalysts for proton reduction is crucial for advancing these technologies.
  • Cobalt complexes with Schiff-base ligands are explored as potential alternatives to precious metal catalysts.

Purpose of the Study:

  • To synthesize and characterize two novel cobalt(III) complexes with Schiff-base ligands.
  • To evaluate the electrocatalytic activity of these complexes for proton reduction.
  • To investigate the kinetic properties and efficiency of the developed catalysts.

Main Methods:

  • Synthesis and characterization of cobalt(III) Schiff-base complexes.
  • Electrochemical measurements including cyclic voltammetry and foot-of-the-wave analysis.
  • Analysis of catalytic Tafel plots to determine kinetic parameters.

Main Results:

  • Both dinitro and tetranitro cobalt(III) Schiff-base complexes demonstrated activity for proton reduction.
  • Catalytic activity was observed at low overpotentials of 120 mV and 280 mV, respectively.
  • Foot-of-the-wave analysis indicated a theoretical maximum turnover frequency (TOFmax) up to 4100 s⁻¹, with experimental TOFs of 7 s⁻¹ and 3 s⁻¹.

Conclusions:

  • The studied cobalt(III) Schiff-base complexes are effective electrocatalysts for proton reduction.
  • These complexes offer a promising, low-cost alternative to traditional precious metal catalysts.
  • Further optimization could lead to highly efficient catalysts for electrochemical energy conversion.