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A Continuous-flow Photocatalytic Reactor for the Precisely Controlled Deposition of Metallic Nanoparticles
Published on: April 10, 2019
Polyoxometalate-stabilized Pt nanoparticles and their electrocatalytic activities
Thomas Hsu-Yao1, Kevin P Browne, Nicole Honesty
1Department of Chemistry, Georgetown University, 37th & "O" Streets NW, Washington, DC 20057, USA.
Physical Chemistry Chemical Physics : PCCP
|March 16, 2011
Summary
This study synthesizes stable platinum nanoparticles (Pt NPs) using polyoxometalate (POM) anions as both reductants and stabilizers. These POM-stabilized Pt NPs exhibit enhanced electrocatalytic activity for methanol oxidation and oxygen reduction reactions compared to commercial Pt black.
Area of Science:
- Nanomaterials Science
- Electrochemistry
- Catalysis
Background:
- Developing stable and highly active electrocatalysts is crucial for energy conversion technologies.
- Platinum nanoparticles (Pt NPs) are widely used but require effective stabilization to prevent aggregation and maintain activity.
- Polyoxometalates (POMs) offer unique structural and electronic properties for stabilizing metal nanoparticles.
Purpose of the Study:
- To synthesize and characterize long-term stable polyoxometalate (POM)-stabilized platinum nanoparticles (Pt NPs).
- To investigate the role of different POM anions (SiW12 and H2W12) in stabilizing Pt NPs and influencing their electrocatalytic performance.
- To evaluate the electrocatalytic activity of POM-stabilized Pt NPs in methanol oxidation reaction (MOR) and oxygen reduction reaction (ORR).
Main Methods:
- Controlled bulk electrolysis for the synthesis of POM-stabilized Pt NPs.
- Transmission electron microscopy (TEM) for nanoparticle size characterization.
- Elemental X-ray photoelectron spectroscopy (XPS) for surface composition analysis.
- Electrochemical techniques (CO stripping, MOR, ORR) to assess electrocatalytic activity.
Main Results:
- Formation of 3-4 nm Pt NPs stabilized by SiW12 and H2W12 POM anions.
- Confirmation of POM anion structural integrity on the Pt NP surface via EC, UV-Vis, and IR spectroscopy.
- POM-stabilized Pt NPs demonstrated enhanced electrocatalytic activity in MOR and ORR compared to commercial Pt black.
- H2W12-stabilized Pt NPs exhibited higher activity enhancement than SiW12-stabilized Pt NPs.
Conclusions:
- Polyoxometalate anions effectively stabilize platinum nanoparticles, leading to long-term stability.
- The choice of POM stabilizing ligand significantly influences the electrocatalytic performance of Pt NPs.
- POM-stabilized Pt NPs represent promising electrocatalysts for reactions like MOR and ORR.
