Insight into Oxygen Transport in Proton Exchange Membrane Water Electrolyzers by In Situ X-Ray Characterization.

ABSTRACT: The proton exchange membrane water electrolyzer (PEMWE) is one of the most promising electrochemical energy conversion devices for hydrogen production, while still limited by performance bottlenecks at high current densities, due to the lack of mass transfer insights. To investigate the mechanisms of oxygen transport inside the PEMWE at high current density and its relation to electrolytic performance. Operational in situ x-ray imaging is utilized to simultaneously characterize the bubble behavior and voltage response in a novel designed visual mini-cell, and it is identified that oxygen evolution and transport in the PEMWE follow the process of bubble nucleation, growth, and detachment. Based on the results of mini-cells with three porous transport layers (PTLs) up to 9 A cm^-2

SUBMITTER: Li P 

PROVIDER: S-EPMC11578382 | biostudies-literature | 2024 Nov

REPOSITORIES: biostudies-literature