ICP-MS Assisted EDX Tomography: A Robust Method for Studying Electrolyte Penetration Phenomena in Gas Diffusion Electrodes Applied to CO₂ Electrolysis.

ABSTRACT: A carbon paper-based gas diffusion electrode (GDE) is used with a bismuth(III) subcarbonate active catalyst phase for the electrochemical reduction of CO₂ in a gas/electrolyte flow-by configuration electrolyser at high current density. It is demonstrated that in this configuration, the gas and catholyte phases recombine to form K₂CO₃/KHCO₃ precipitates to an extent that after electrolyses, vast amount of K⁺ ions is found by EDX mapping in the entire GDE structure. The fact that the entirety of the GDE gets wetted during electrolysis should, however, not be interpreted as a sign of flooding of the catalyst layer, since electrolyte perspiring through the GDE can largely be removed with the outflow gas, and the efficiency of electrolysis

SUBMITTER: Rieder A 

PROVIDER: S-EPMC11672170 | biostudies-literature | 2024 Dec

REPOSITORIES: biostudies-literature