Heat-treated copper phthalocyanine on carbon toward electrochemical CO 2 conversion into ethylene boosted by oxygen reduction.

Copper phthalocyanine on carbon (CuPc/C) after pyrolysis exhibits a C 2 H 4 Faradaic efficiency (FE C 2 H 4 ) of 42.6 ± 0.5% at an extremely low potential of -0.4 V vs. RHE toward the electrochemical CO 2 reduction reaction (CO 2 RR), significantly boosted by the in situ oxygen reduction reaction (ORR).