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  Solutal Marangoni effect determines bubble dynamics during electrocatalytic hydrogen evolution

Park, S., Liu, L., Demirkır, Ç., van der Heijden, O., Lohse, D., Krug, D., et al. (2023). Solutal Marangoni effect determines bubble dynamics during electrocatalytic hydrogen evolution. Nature Chemistry, 15, 1532-1540. doi:10.1038/s41557-023-01294-y.

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Item Permalink: https://hdl.handle.net/21.11116/0000-000F-2F65-C Version Permalink: https://hdl.handle.net/21.11116/0000-000F-2F66-B
Genre: Journal Article

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s41557-023-01294-y.pdf (Publisher version), 2MB
 
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 Creators:
Park, Sunghak, Author
Liu, Luhao, Author
Demirkır, Çayan, Author
van der Heijden, Onno, Author
Lohse, Detlef1, Author           
Krug, Dominik, Author
Koper, Marc T. M., Author
Affiliations:
1Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063285              

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 Abstract: Understanding and manipulating gas bubble evolution during electrochemical water splitting is a crucial strategy for optimizing the electrode/electrolyte/gas bubble interface. Here gas bubble dynamics are investigated during the hydrogen evolution reaction on a well-defined platinum microelectrode by varying the electrolyte composition. We find that the microbubble coalescence efficiency follows the Hofmeister series of anions in the electrolyte. This dependency yields very different types of H2 gas bubble evolution in different electrolytes, ranging from periodic detachment of a single H2 gas bubble in sulfuric acid to aperiodic detachment of small H2 gas bubbles in perchloric acid. Our results indicate that the solutal Marangoni convection, induced by the anion concentration gradient developing during the reaction, plays a critical role at practical current density conditions. The resulting Marangoni force on the H2 gas bubble and the bubble departure diameter therefore depend on how surface tension varies with concentration for different electrolytes. This insight provides new avenues for controlling bubble dynamics during electrochemical gas bubble formation.

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Language(s): eng - English
 Dates: 2023-08-102023-11
 Publication Status: Issued
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1038/s41557-023-01294-y
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Project name : BU-PACT
Grant ID : 950111
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)
Project name : DDD
Grant ID : 740479
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)
Project name : FRUMKIN
Grant ID : 101019998
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)

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Title: Nature Chemistry
  Abbreviation : Nat. Chem.
Source Genre: Journal
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Publ. Info: London, UK : Nature Publishing Group
Pages: - Volume / Issue: 15 Sequence Number: - Start / End Page: 1532 - 1540 Identifier: ISSN: 1755-4330
CoNE: https://pure.mpg.de/cone/journals/resource/1755-4330