The role of Anions and Additives in Electrochemical CO2 Reduction

The electrochemical reduction of CO2 (eCO2R) is governed by complex interactions at the electrode-electrolyte interface. Recent studies show that electrolyte species in the electrical double layer can strongly affect the CO2 reduction activity and selectivity. While the role of cations in eCO2R is relatively well understood, recent studies show that anions and molecular additives can be equally influential. Here, we discuss how these species can facilitate eCO2R intermediate stabilization and suppress the hydrogen evolution reaction, enhancing the activity and selectivity of eCO2R.