Coupling Plant Polyphenol Coordination Assembly with Co(OH)₂ to Enhance Electrocatalytic Performance towards Oxygen...

Area of Science:

• Electrochemistry
• Materials Science
• Catalysis

Background:

• The oxygen evolution reaction (OER) is crucial for energy conversion but is kinetically limited by its four-electron transfer pathway.
• Developing efficient and cost-effective catalysts is essential to overcome OER's sluggish kinetics.
• Biomass-derived materials offer sustainable and inexpensive precursors for advanced catalyst design.

Purpose of the Study:

• To synthesize a novel heterostructure electrocatalyst for enhanced oxygen evolution reaction (OER) performance.
• To investigate the synergistic effects of plant-polyphenol coordination assembly on Co(OH)₂ nanosheets for OER.
• To demonstrate a facile and scalable strategy for utilizing biomass-derived modifiers in electrocatalysis.

Main Methods:

• Fabrication of a Co(OH)₂@TA-Fe heterostructure electrocatalyst via a coordination assembly strategy.
• Characterization of the catalyst's structure and properties using electrochemical techniques.
• Evaluation of the electrocatalyst's performance for the oxygen evolution reaction (OER).

Main Results:

• The Co(OH)₂@TA-Fe heterostructure exhibited significantly reduced OER overpotential (297 mV at 10 mA cm^-2).
• The catalyst demonstrated favorable reaction kinetics with a low Tafel slope (64.8 mV dec^-1) and enhanced charge transfer.
• Confined growth of the coordination assembly on Co(OH)₂ exposed more active sites, leading to synergistic performance enhancement.

Conclusions:

• The Co(OH)₂@TA-Fe heterostructure serves as a highly efficient electrocatalyst for the oxygen evolution reaction.
• The strategy of using biomass-derived tannic acid as a modifier effectively enhances catalyst performance.
• This study presents a simple and feasible approach for developing advanced electrocatalysts for energy conversion applications.