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Proton reduction by a bimetallic zinc selenolate electrocatalyst.

Aditya Upadhyay1, K V Saurav1, Evelin Lilly Varghese1

  • 1Department of Chemistry, Indian Institute of Science Education and Research Bhopal By-Pass Road, Bhauri Bhopal 462 066 Madhya Pradesh India sangitkumar@iiserb.ac.in.

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This study introduces a novel bimetallic zinc selenolate complex for efficient hydrogen production. This metal-free ligand catalyst achieves a high turnover frequency (TOF) for the hydrogen evolution reaction (HER).

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Area of Science:

  • Electrochemistry
  • Catalysis
  • Materials Science

Background:

  • Developing efficient alternative energy sources is crucial.
  • Existing homogeneous electrocatalysts often rely on metal oxidation states or active ligands.
  • There is a need for robust and efficient catalysts for the hydrogen evolution reaction (HER).

Purpose of the Study:

  • To synthesize and structurally characterize a novel bimetallic zinc selenolate complex.
  • To investigate its efficacy as a homogeneous electrocatalyst for the hydrogen evolution reaction (HER).
  • To evaluate the catalyst's stability and efficiency under various electrochemical conditions.

Main Methods:

  • Synthesis and structural characterization of the bimetallic zinc selenolate complex.
  • Electrochemical analysis including current-voltage measurements to determine onset overpotential.
  • Constant potential electrolysis (CPE) to assess stability and Faradaic efficiency.
  • Preliminary investigation of heterogeneous catalyst performance by electrode surface deposition.

Main Results:

  • The bimetallic zinc selenolate complex was successfully synthesized and characterized.
  • The catalyst demonstrated efficient HER with an onset overpotential of 0.86 V vs. Ag/AgCl.
  • A high turnover frequency (TOF) of 509 s-1 was achieved, one of the highest for homogeneous TM-metal-free ligand-centered HER catalysts.
  • The catalyst exhibited stability under both cathodic and anodic potentials during bulk electrolysis.
  • A Faradaic efficiency of 75% for hydrogen gas generation was recorded.

Conclusions:

  • The developed bimetallic zinc selenolate complex is a highly efficient and stable homogeneous electrocatalyst for the hydrogen evolution reaction (HER).
  • This catalyst offers a promising alternative to traditional electrocatalysts, utilizing a redox-silent metal center and a metal-free ligand.
  • Further research into heterogeneous applications by surface deposition shows potential for broader catalytic uses.