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Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions

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Published on: September 7, 2018

Proton exchange membrane-like alkaline water electrolysis using flow-engineered three-dimensional electrodes.

Fernando Rocha¹, Christos Georgiadis¹, Kevin Van Droogenbroek¹

¹Division of Materials and Process Engineering, Université catholique de Louvain, Louvain-la-Neuve, Belgium.

Nature Communications

|August 28, 2024

Summary

Researchers developed flow-engineered 3-D electrodes for efficient gas bubble removal in water electrolysers. This innovation enhances performance by mimicking Proton Exchange Membrane (PEM) designs in alkaline electrolysis.

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Area of Science:

Electrochemistry
Materials Science
Chemical Engineering

Background:

Minimizing Ohmic losses via efficient gas bubble evacuation is crucial for high-rate water electrolysers.
Improving electrode electrocatalytic properties is key to reducing activation losses.

Purpose of the Study:

To identify topological parameters of flow-engineered 3-D electrodes for enhanced bubble evacuation.
To investigate the potential of integrating these electrodes into a laterally-graded bi-layer zero-gap cell configuration for alkaline water electrolysis.

Main Methods:

Combined experimental and computational fluid dynamics (CFD) approach.
Detailed CFD simulations of 3-D electrode and cell topology.
Analysis of electrolyte flow dynamics under forced upstream flow.

Main Results:

Ni-based foam electrodes in a graded bi-layer zero-gap cell configuration demonstrated PEM-like performance in alkaline water electrolysis.
The graded structure induced high lateral electrolyte velocity away from the diaphragm.
State-of-the-art Zirfon diaphragm performance was maintained.

Conclusions:

Flow-engineered 3-D electrodes with specific topological parameters can significantly enhance bubble evacuation.
PEM-like cell designs, including square or rectangular electrodes in flow-through cells, are promising for alkaline water electrolysis.