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Updated: Sep 28, 2025
Millifluidics for Chemical Synthesis and Time-resolved Mechanistic Studies
Published on: November 27, 2013
Frequency controlled agglomeration of pt-nanoparticles in sonochemical synthesis
Henrik E Hansen1, Frode Seland2, Svein Sunde2
1Electrochemistry Group, Department of Materials Science and Engineering, Faculty of Natural Sciences, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway; Hydrogen Energy and Sonochemistry Research Group, Department of Energy and Process Engineering, Faculty of Engineering, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway.
Reproducible platinum nanoparticles for catalysis can be synthesized using sonochemistry. Optimal ultrasonic frequencies are not critical for primary particle size or hydrogen evolution activity, simplifying synthesis.
Area of Science:
- Materials Science
- Nanotechnology
- Electrochemistry
Background:
- Optimizing nanoparticle surface area is crucial for efficient catalytic activity in electrochemical energy conversion.
- Sonochemical synthesis offers a route to producing nanoparticles with desirable properties.
Purpose of the Study:
- To investigate the optimal ultrasonic frequency range for sonochemical synthesis of platinum nanoparticles.
- To determine if varying frequencies affect nanoparticle properties and catalytic activity.
Main Methods:
- Sonochemical synthesis of platinum nanoparticles across a frequency range of 200-500 kHz.
- Physical characterization (agglomerate size) and electrochemical characterization (electrochemical surface area, catalytic activity).
Main Results:
- Lower frequencies (210 kHz) yielded smaller, more open agglomerates (238 nm) with higher electrochemical surface areas (12.4 m²g⁻¹) compared to higher frequencies (326 kHz; 274 nm; 3.4 m²g⁻¹).
- Primary particle size (2.1 nm) and catalytic activity for hydrogen evolution remained consistent across all tested frequencies.
- Reproducible platinum nanoparticle properties were achieved throughout the broad ultrasonic frequency range.
Conclusions:
- Ultrasonic frequency significantly influences agglomerate morphology and electrochemical surface area but not primary particle size or catalytic performance.
- Sonochemical synthesis provides a robust method for producing reproducible platinum nanoparticles for catalysis over a wide frequency range.
