Concentric circular flow field to improve mass transport in large-scale proton exchange membrane water electrolysis cells
Year: 2024
Type: article
Abstract: Subject Renewable Energy High-performance proton-exchange membrane water electrolysis (PEMWE) for renewable energy storage must operate at high current densities over large active areas. However, as the area and current density increase, the even distribution of the fuel becomes a challenge. This uneven distribution increases the mass transfer resistance and deteriorates cell performance. Mass transfer is also affected by the anode flow field orientation, anode flow field pattern, and stoichiometric ratio. In this study, the performances of the two flow field patterns were compared for a single PEMWE cell with an active area of 100cm2. A straight serpentine was used as the reference model and a concentric circle was designed in an arc shape. These results indicate that the optimum anode flow-field pattern differs depending on the stoichiometric ratio. At low flow rates, mass transfer via diffusion dominated; therefore, straight serpentine flow was preferred. By contrast, a concentric circle, which induced a large differential pressure between adjacent channels, was preferable at a high flow rate. Additionally, water is better distributed by gravity and buoyancy when the electrolyte membrane is parallel to the ground and the anode flow path is above the porous medium. This leads to high PEMWE cell performance.
Source: Energy Reports
Authors: Woojung Lee, Inae Pyun, Youngseung Na
Institution: University of Seoul
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,700
OpenAlex ID: W4402908537