Chemostructurally Stable Polyionomer Coatings Regulate Proton-Intermediate Landscape in Acidic CO₂ Electrolysis.

ABSTRACT: CO₂ electroreduction (CO₂R) in acidic media offers a path to high carbon utilization via local carbonate regeneration. However, this proton-rich environment challenges achieving a combined selectivity and rate toward multicarbon (C₂₊) products due to proton and intermediate competition. Here, we demonstrate a strategy to modulate local protons and intermediates, at these settings, using a polyionomer coating over benchmark copper gas diffusion electrodes. The polyionomer integrates amine (-NH_x) function from branched polyethylenimine (PEI) with sulfonate (-SO₃^-) and amphiphilic functions from PFSA. We show that their chemical structure enables H-bonding interaction, leading to a stereochemical assembly that retains a

SUBMITTER: Polesso B 

PROVIDER: S-EPMC12333358 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature