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Updated: Jul 31, 2025
09:50
Electrochemically and Bioelectrochemically Induced Ammonium Recovery
Published on: January 22, 2015
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Sono-electrolysis performance based on indirect continuous sonication and membraneless alkaline electrolysis:
Kaouther Kerboua1, Nour Hane Merabet2
1National Higher School of Technology and Engineering, Department of Process Engineering, 23005 Annaba, Algeria.
Ultrasonics Sonochemistry
|May 5, 2023
Summary
This study combines sono-electrolysis experiments with a mathematical model to understand acoustic cavitation effects. Ultrasounds primarily enhance hydrogen production via shockwaves and microjets, not sonochemistry, reducing electrode coverage and resistance.
Area of Science:
- Electrochemistry
- Acoustics
- Chemical Engineering
Background:
- Membraneless alkaline electrolysis offers potential for hydrogen production.
- Acoustic cavitation introduces complex sono-physical and sonochemical effects.
- Understanding ultrasound-enhanced electrolysis mechanisms is crucial for efficiency.
Purpose of the Study:
- To elucidate the mechanism of acoustic cavitation in alkaline sono-electrolysis.
- To model sono-electrolyzer performance considering electrochemical and cavitation dynamics.
- To quantify the contribution of sono-physical versus sonochemical effects.
Main Methods:
- Experimental sono-electrolysis in a membraneless H-cell with indirect sonication (40 kHz, 60 We).
- Mathematical modeling of electrochemical resistances, overpotentials, and bubble cavitation dynamics.
- Calorimetric characterization to link experimental and numerical results.
Main Results:
- Sonochemistry was found to have no contribution to hydrogen production.
- Ultrasounds enhance electrolysis through shockwaves and microjets, not sonochemical reactions.
- Reduced electrode coverage (76% to 42%) led to decreased Ohmic resistance (7.2%) and bubble resistance (62.35%).
Conclusions:
- Acoustic cavitation's sono-physical effects, specifically shockwaves and microjets, dominate alkaline sono-electrolysis.
- The study provides a validated model for sono-electrolyzer performance.
- Optimizing ultrasound parameters can significantly improve hydrogen production efficiency by managing electrode surface phenomena.
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