Numerous studies have demonstrated that the presence of chloride anions enhances CO selectivity while suppressing the hydrogen evolution reaction (HER). Jihun Oh revealed that chloride-adsorbed Au electrodes exhibited four times the CO selectivity at -0.39 V compared to bare Au. Their studies, both theoretical and experimental, elucidated the role of adsorbed chloride on the Au surface in influencing ECR activity and selectivity. Similarly, adsorbed chloride on Ag surfaces has been shown to boost ECR intrinsic activity and selectivity by minimising side reactions associated with HER. Zn-based catalysts have also been extensively investigated in chloride anion-containing electrolytes. It has been hypothesized that the increased CO Faradaic efficiency results from chloride anion adsorption on the electrode surface, which preferentially facilitates electron transfer from CO2 to intermediates, thereby enhancing CO generation selectivity. For instance, a chloride anion-linked Ag nanocoral structure exhibited 32 times greater ECR activity compared to pure Ag. While halide adsorption on Cu-based catalysts has been explored, the role of chloride ions in tuning ECR pathways for selective ethane formation remains underexplored, particularly when introduced via direct catalyst modification rather than electrolyte-based approaches.