for CO and 1.6% for HCOOH production. At a more negative potential of -0.65 V vs. RHE, jtot increased, with corresponding FEs of 27.6% for CO, 2.2% for HCOOH, and 13.7% for CH4 production. At -0.75 V vs. RHE, ethane production became significant, with an FE of 16.4% alongside FEs of 24%, 22.9%, and 3.7% for CO, CH4, and HCOOH, respectively, at an increased current density. Notably, a peak FE of 34.8% for C2H6 production was observed at -1 V vs. RHE, accompanied by an FE of 11.3% for C2H4 production (Figure ). This corresponds to an overpotential of only 40 mV relative to the equilibrium potential for the CO2/C2H6 reaction (0.554 V vs. RHE). Additionally, the FE for C2H6 production on the CTC-65 electrode remained relatively stable over time, indicating consistent catalytic activity for CO2 reduction. These results highlight the efficiency and stability of the CTC-65 electrode in selectively converting CO2 into C2 hydrocarbons during electrocatalysis.