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Preparation of Highly Porous Coordination Polymer Coatings on Macroporous Polymer Monoliths for Enhanced Enrichment of Phosphopeptides
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Zn and Co redox active coordination polymers as efficient electrocatalysts.

Ruslan Shekurov1, Vera Khrizanforova, Leysan Gilmanova

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New helical coordination polymers containing zinc and cobalt exhibit efficient electrocatalysis for hydrogen production. These materials demonstrate fast reaction rates and long-term stability, making them promising for hydrogen evolution reactions.

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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Electrochemistry

Background:

  • Coordination polymers (CPs) are investigated for their catalytic properties.
  • Redox-active ligands can impart unique electrochemical characteristics to CPs.
  • Developing efficient electrocatalysts for hydrogen evolution is crucial for renewable energy.

Purpose of the Study:

  • Synthesize and characterize novel 1D helical coordination polymers using a ferrocenyl phosphinic acid ligand.
  • Evaluate the redox and electrocatalytic properties of these CPs, particularly for hydrogen evolution.
  • Compare the performance of zinc and cobalt CPs as electrocatalysts.

Main Methods:

  • Synthesis of coordination polymers M(fcdHp) (M = Zn, Co) using 1,1'-ferrocenylenbis(H-phosphinic) acid (H2fcdHp) and metal nitrates.
  • Crystallographic analysis to determine isomorphic structures in chiral space groups.
  • Incorporation into carbon paste electrodes for electrochemical studies.
  • Electrocatalytic evaluation for hydrogen evolution reaction (HER) in acetonitrile and sulfuric acid solutions.

Main Results:

  • Isomorphic 1D helical coordination polymers of Zn(1) and Co(2) were successfully synthesized.
  • Both complexes exhibit reversible redox behavior due to the ferrocenyl moiety.
  • Cobalt CP (2) shows a high turnover frequency of 300 s-1 for hydrogen evolution in acetonitrile.
  • CPs demonstrate good electrocatalytic activity for HER in 0.5 M H2SO4 with notable overpotentials and Tafel slopes.
  • Long-term stability was observed for the hydrogen evolution reaction.

Conclusions:

  • The synthesized helical coordination polymers are efficient electrocatalysts for proton reduction to hydrogen.
  • The cobalt-based CP exhibits one of the fastest rates reported for CP electrocatalysts in acetonitrile.
  • These CPs show promise for applications in electrocatalytic hydrogen production.