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Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts
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Polyoxometalate-Complexed Indium Hydroxide: Atomically Homogeneous Impregnation via Countercation Exchange
Tal Tubul-Sterin1, Mark Baranov1, Gal Gan-Or1
1Department of Chemistry and Ilse Katz Institute for Nanoscale Science & Technology, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel.
Inorganic Chemistry
|March 21, 2022
Summary
Researchers developed stable, water-soluble indium hydroxide nanocrystal (NC) complexes using polyoxometalate (POM) ligands. This breakthrough enables enhanced catalysis, such as improved CO2 reduction, and versatile applications in functional materials.
Area of Science:
- Materials Science
- Inorganic Chemistry
- Nanotechnology
Background:
- Metal hydroxides are crucial catalysts and precursors for advanced materials.
- Existing methods lack stable, water-soluble metal hydroxide nanocrystal (NC) complexes for versatile applications.
Purpose of the Study:
- To develop general methods for stable, water-soluble metal hydroxide NC complexes.
- To explore their utility in catalysis and as precursors for multicomponent devices.
Main Methods:
- Utilized Indium(III)-substituted Wells-Dawson (WD) polyoxometalate (POM) cluster anions as ligands.
- Synthesized platelike indium hydroxide NCs complexed with WD POMs.
- Employed countercation exchange for homogeneous dispersion of transition metal ions (e.g., Cu2+).
- Characterized NCs using cryogenic transmission electron microscopy.
Main Results:
- Created stable, water-soluble complexes of In(OH)3 NCs stabilized by WD POM ligands.
- Achieved homogeneous dispersion of ~1800 Cu2+ ions per NC core via ion exchange.
- Demonstrated a 15-fold increase in CO2 electroreduction to CO efficiency using the Cu2+-impregnated NCs compared to a control.
Conclusions:
- Polyoxometalate (POM) complexation offers a promising strategy for stabilizing and solubilizing reactive metal hydroxide NCs.
- This method facilitates the creation of advanced catalytic materials and versatile precursors for functional multicomponent devices.
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