Chladni figures reduce ohmic losses in alkaline electrolysis

Agrež, Vid (avtor), Heidary, Zeinab (avtor), Gavaises, Manolis (avtor), Petkovšek, Martin (avtor), Ohl, Claus-Dieter (avtor)

An method for hydrogen bubble removal through ultrasonic excitation applied directly through the cathode is presented in this work. High-speed imaging, pressure field measurements, and overvoltage monitoring were employed to characterize how cathode vibration in the 100 kHz range influences electrolytic efficiency. Upon the start of the vibration, hydrogen bubbles detached and migrated across the surface, forming distinct spatial patterns corresponding to the electrode’s vibrational modes and resembling Chladni figures. The bubble migration is dominated by the primary Bjerknes force arising from acoustic pressure gradients. This is confirmed by the Keller-Miksis model which predicts the observed movement of the bubbles to the pressure nodes. The work demonstrates that electrode vibrations significantly reduced ohmic losses, with overvoltage dropping 20% within 100 ms during a 2 s activation period. The voltage required 7 s to return to initial values after deactivation, indicating that pulsed vibration strategies can achieve superior efficiency compared to continuous running setups.

• Jezik: Angleški jezik
• Ključne besede: alkaline electrolysis, Bjerknes force, hydrogen generation, Chladni figures
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FS - Fakulteta za strojništvo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2026
• Št. strani: 8 str.
• Številčenje: Vol. 128, art. 107833
• PID: 20.500.12556/RUL-181283
• UDK: 532.5:544.642
• ISSN pri članku: 1350-4177
• DOI: 10.1016/j.ultsonch.2026.107833
• COBISS.SI-ID: 273591299
• Datum objave v RUL: 30.03.2026

Gradivo je del revije

• Naslov: Ultrasonics sonochemistry
• Skrajšan naslov: Ultrason. sonochem.
• Založnik: Butterworth-Heinemann, Elsevier
• ISSN: 1350-4177
• COBISS.SI-ID: 707668

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: alkalna elektroliza, Bjerknesova sila, nastajanje vodika, Chladnijeve oblike

Projekti

• Financer: ARIS - Javna agencija za znanstvenoraziskovalno in inovacijsko dejavnost Republike Slovenije
• Številka projekta: P2-0270
• Naslov: Proizvodni sistemi, laserske tehnologije in spajanje materialov

• Financer: DFG - Deutsche Forschungsgemeinschaft
• Program financ.: Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) Award
• Številka projekta: ME 1645/12-1