A trinuclear cobalt-based coordination polymer as an efficient oxygen evolution electrocatalyst at neutral pH.

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Artificial photosynthesis requires efficient, cost-effective water oxidation catalysts.
• Current noble metal catalysts (Pt, Ru, Ir) are expensive and scarce.
• Developing robust, earth-abundant catalysts is a major challenge.

Purpose of the Study:

• To synthesize and characterize a novel cobalt-based coordination polymer.
• To evaluate its performance as an electrocatalyst for water oxidation at neutral pH.
• To explore its potential as a noble metal-free alternative for artificial photosynthesis.

Main Methods:

• Synthesis of a 3D cobalt-based coordination polymer {[Co3(pyz)(fa)3(dmso)2]·2H2O}n.
• Electrochemical characterization, including cyclic voltammetry and controlled potential electrolysis.
• Analysis of catalytic activity for water oxidation at neutral pH.

Main Results:

• The synthesized compound exhibits a unique 3D stair-like architecture with honeycomb channels.
• It demonstrates remarkable efficiency as a water oxidation electrocatalyst.
• Achieved a current density of 1 mA·cm⁻² at a low overpotential of 257 mV with a Tafel slope of 80.5 mV·dec⁻¹.

Conclusions:

• The 3D cobalt-based coordination polymer is a highly efficient, noble metal-free water oxidation catalyst.
• Its unique structure contributes to its superior catalytic performance.
• This finding guides the development of advanced catalysts for artificial photosynthesis.