Hydrogen Bubble Size Distribution on Nanostructured Ni Surfaces: Electrochemically Active Surface Area Versus Wettability.

Autor: Krause L; Institute of Process Engineering and Environmental Technology, Technische Universität Dresden, Helmholtzstraße 14, 01069 Dresden, Germany.; Institute of Fluid Dynamics, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany., Skibińska K; Faculty of Non-Ferrous Metals, AGH University of Science and Technology, A. Mickiewicza 30, 30-059 Kraków, Poland.; Centrum Badań i Rozwoju Technologii dla Przemysłu S.A., Ludwika Waryńskiego 3A, 00-645 Warszawa, Poland., Rox H; Institute of Fluid Dynamics, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany., Baumann R; Institute of Manufacturing Science and Engineering, Technische Universität Dresden, George-Baehr-Straße 3c, 01069 Dresden, Germany., Marzec MM; Academic Centre for Materials and Nanotechnology, AGH University of Science and Technology, A. Mickiewicza 30, 30-059 Kraków, Poland., Yang X; Institute of Fluid Dynamics, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany., Mutschke G; Institute of Fluid Dynamics, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany., Żabiński P; Faculty of Non-Ferrous Metals, AGH University of Science and Technology, A. Mickiewicza 30, 30-059 Kraków, Poland., Lasagni AF; Institute of Manufacturing Science and Engineering, Technische Universität Dresden, George-Baehr-Straße 3c, 01069 Dresden, Germany.; Fraunhofer Institut für Werkstoff- und Strahltechnik IWS, Winterbergstraße 28, 01277 Dresden, Germany., Eckert K; Institute of Process Engineering and Environmental Technology, Technische Universität Dresden, Helmholtzstraße 14, 01069 Dresden, Germany.; Institute of Fluid Dynamics, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany.
Jazyk: angličtina
Zdroj: ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2023 Apr 12; Vol. 15 (14), pp. 18290-18299. Date of Electronic Publication: 2023 Apr 03.
DOI: 10.1021/acsami.2c22231
Abstrakt: Emerging manufacturing technologies make it possible to design the morphology of electrocatalysts on the nanoscale in order to improve their efficiency in electrolysis processes. The current work investigates the effects of electrode-attached hydrogen bubbles on the performance of electrodes depending on their surface morphology and wettability. Ni-based electrocatalysts with hydrophilic and hydrophobic nanostructures are manufactured by electrodeposition, and their surface properties are characterized. Despite a considerably larger electrochemically active surface area, electrochemical analysis reveals that the samples with more pronounced hydrophobic properties perform worse at industrially relevant current densities. High-speed imaging shows significantly larger bubble detachment radii with higher hydrophobicity, meaning that the electrode surface area that is blocked by gas is larger than the area gained by nanostructuring. Furthermore, a slight tendency toward bubble size reduction of 7.5% with an increase in the current density is observed in 1 M KOH.
Databáze: MEDLINE