In-situ measurements of temperature field and Marangoni convection at hydrogen bubbles using schlieren and PTV techniques

Babich, A.; Bashkatov, Aleksandr; Yang, Xuegeng; Mutschke, Gerd; Eckert, Kerstin

doi:10.1016/j.ijheatmasstransfer.2023.124466

Cited by 13 publications

(2 citation statements)

References 35 publications

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“…To set the baseline, we briefly report the results for the case where only a single electrode is operated, which has been studied previously. ,,− As an example, Figure a shows the transient current ( I s ) and radius ( R s ) of the bubble for three complete bubble evolution cycles at −1.0 V. Shadowgraphs corresponding to a complete cycle from nucleation − to departure are included in Figure b. This process is highly periodic with a bubble lifetime of T s .…”

Section: Resultsmentioning

confidence: 99%

Performance Enhancement of Electrocatalytic Hydrogen Evolution through Coalescence-Induced Bubble Dynamics

Bashkatov,

Park,

Demirkır

et al. 2024

J. Am. Chem. Soc.

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The evolution of electrogenerated gas bubbles during water electrolysis can significantly hamper the overall process efficiency. Promoting the departure of electrochemically generated bubbles during (water) electrolysis is therefore beneficial. For a single bubble, a departure from the electrode surface occurs when buoyancy wins over the downward-acting forces (e.g., contact, Marangoni, and electric forces). In this work, the dynamics of a pair of H 2 bubbles produced during the hydrogen evolution reaction in 0.5 M H 2 SO 4 using a dual platinum microelectrode system is systematically studied by varying the electrode distance and the cathodic potential. By combining highspeed imaging and electrochemical analysis, we demonstrate the importance of bubble−bubble interactions in the departure process. We show that bubble coalescence may lead to substantially earlier bubble departure as compared to buoyancy effects alone, resulting in considerably higher reaction rates at a constant potential. However, due to continued mass input and conservation of momentum, repeated coalescence events with bubbles close to the electrode may drive departed bubbles back to the surface beyond a critical current, which increases with the electrode spacing. The latter leads to the resumption of bubble growth near the electrode surface, followed by buoyancy-driven departure. While less favorable at small electrode spacing, this configuration proves to be very beneficial at larger separations, increasing the mean current up to 2.4 times compared to a single electrode under the conditions explored in this study.

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Section: Resultsmentioning

confidence: 99%

Performance Enhancement of Electrocatalytic Hydrogen Evolution through Coalescence-Induced Bubble Dynamics

Bashkatov,

Park,

Demirkır

et al. 2024

J. Am. Chem. Soc.

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“…Ihr Ursprung ist thermokapillarer Natur, da die Dissipation des elektrischen Stromes in Joule'sche Wa ¨rme zu einem Temperaturgradienten an der Blase fu ¨hrt, der durch die Schlieren-Technik messtechnisch erfasst werden kann, s. Abb. 8b (links) [117,120]…”

Section: Heidenreich Wurden Neben Vielen Industrienahenunclassified

70 Jahre Verfahrenstechnik an der TU Dresden

Beckmann,

Babick,

Eckert

et al. 2023

Chemie Ingenieur Technik

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An der Technischen Hochschule Dresden, der Vorgängereinrichtung der TU Dresden, wurde 1953 mit der Besetzung der Fachprofessur für Verfahrenstechnik eine Fachrichtung „Ingenieur für Verfahrenstechnik“ eingerichtet und das heutige Institut für Verfahrenstechnik und Umwelttechnik begründet. Seitdem wurde das Profil in Ausbildung und Forschung des Instituts innerhalb der Fakultät Maschinenwesen der Technische Universität Dresden (TUD) erheblich weiterentwickelt. Ausgehend von dieser Entwicklung werden die heutigen Forschungsschwerpunkte der fünf Professuren und Arbeitsgruppen vorgestellt.

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Evolution of hydrogen bubbles on a microelectrode driven by constant currents and its impact on potential response

Lu,

Yadav,

Zhou

et al. 2024

Chemical Engineering Journal

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In-situ measurements of temperature field and Marangoni convection at hydrogen bubbles using schlieren and PTV techniques

Cited by 13 publications

References 35 publications

Performance Enhancement of Electrocatalytic Hydrogen Evolution through Coalescence-Induced Bubble Dynamics

Performance Enhancement of Electrocatalytic Hydrogen Evolution through Coalescence-Induced Bubble Dynamics

70 Jahre Verfahrenstechnik an der TU Dresden

Evolution of hydrogen bubbles on a microelectrode driven by constant currents and its impact on potential response

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