Integrating Salen Complexes into Gas Diffusion Electrodes for CO2 Electroreduction: Considerations for Employing Molecular Precatalysts in Heterogeneous Electrolyzers

Abstract

Transition metal salen complexes (Co, Ni, Cu) are studied as precatalysts for CO₂-to-CO electroreduction in zero-gap electrolyzers. Performance depends strongly on metal choice and electrode characteristics. XPS, UV-Vis, comparisons to simple metal salts, and a RHE-ZGE half-cell setup shed light on precatalyst decomposition and inform methodologies for molecular electrocatalyst heterogenization.