Functionalization of Water-Soluble Metallopolymer Electrocatalysts for Water-Splitting Using Atom Transfer Radical...

Area of Science:

• Materials Science
• Electrochemistry
• Polymer Chemistry

Background:

• Functionalization of diiron disulfide [2Fe-2S] metallopolymer electrocatalysts is key to improving molecular hydrogen generation via water-splitting.
• Mild post-polymerization modification techniques are necessary to preserve the integrity of the iron carbonyl (Fe-CO) bonds within the [2Fe-2S] active site.

Purpose of the Study:

• To develop a novel synthetic strategy for functionalizing [2Fe-2S] metallopolymers.
• To employ atom transfer radical polymerization (ATRP) and azide-alkyne click chemistry for precise polymer modification.
• To evaluate the electrocatalytic performance of the functionalized metallopolymers for water-splitting.

Main Methods:

• Synthesized azide-functionalized [2Fe-2S] metallopolymers via ATRP of 3-azidopropyl methacrylate (AzPMA) with methyl methacrylate (MMA) or 2-(dimethylamino)ethyl methacrylate (DMAEMA).
• Utilized copper-catalyzed azide-alkyne cycloaddition (click chemistry) for post-polymerization functionalization with terminal alkynes.
• Characterized the resulting PMMA and PDMAEMA functional metallo-copolymers.

Main Results:

• The click chemistry modification successfully functionalized the metallopolymers without degrading the critical Fe-CO bonds in the [2Fe-2S] active sites.
• Both PMMA and PDMAEMA based functional metallo-copolymers retained high electrocatalytic activity.
• The functionalized catalysts demonstrated efficient electrochemical water-splitting under pH-neutral aqueous conditions.

Conclusions:

• The developed ATRP and click chemistry methodology provides a robust route for tailoring the properties of [2Fe-2S] metallopolymers.
• This approach enables the creation of highly active and stable electrocatalysts for water-splitting.
• The functionalized metallopolymers show significant promise for sustainable hydrogen production.