Manufacturing Free-Standing, Porous Metallic Layers with Dynamic Hydrogen Bubble Templating

Adrian Mularczyk, Daniel Niblett, Adam Wijpkema, Marc P.F.H.L. van Maris, Antoni Forner-Cuenca (Corresponding author)

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Samenvatting

The 3D structure (i.e., microstructure) of porous electrodes governs the performance of emerging electrochemical technologies such as fuel cells, electrolysis, and batteries. Sustaining electrochemical reactions and convective-diffusive mass transport at high efficiency is complex and motivates the search for sophisticated microstructures with multimodal pore size distributions and pore size gradients. Here a new synthesis route for porous, metallic layers is presented that combines the characteristics of carbon structures (i.e., pore size, porosity) with the properties of metals (i.e., recyclability, conductivity). Building on the method of dynamic hydrogen bubble templating, a novel approach is engineered to manufacture thin, free-standing layers using an electrochemical flow cell through the introduction of an intermediate layer and optimization of the synthesis parameters. Mechanically stable layers are created with thicknesses ranging from ≈50 to ≈200 µm comprising porous, dendritic structures, arranged to form a vascular network of larger pores with a gradient in radii from ≈5 µm at the bottom and up to ≈36 µm at the top of the material. Using X-ray tomographic data, the morphology is analyzed, and the diffusive transport through the material as a function of liquid filling is simulated and compared to state-of-the-art carbon fiber-based electrodes, showing significantly higher mass transfer properties.

Originele taal-2Engels
Artikelnummer2400052
Aantal pagina's12
TijdschriftAdvanced Materials Interfaces
Volume11
Nummer van het tijdschrift16
Vroegere onlinedatum25 apr. 2024
DOI's
StatusGepubliceerd - 6 jun. 2024

Financiering

FinanciersFinanciernummer
Horizon 2020899987
UK Research and InnovationEP/W005204/1

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