Identifying an Interfacial Stabilizer for Regeneration-Free 300 h Electrochemical CO 2 Reduction to C 2 Products.

The electrochemical CO 2 reduction reaction (CO 2 RR) to produce high value-added hydrocarbons and oxygenates presents a sustainable and compelling approach toward a carbon-neutral society. However, uncontrollable migration of active sites during the electrochemical CO 2 RR limits its catalytic ability to simultaneously achieve high C 2 selectivity and ultradurability. Here, we demonstrate that the generated interfacial CuAlO 2 species can efficiently stabilize the highly active sites over the Cu-CuAlO 2 -Al 2 O 3 catalyst under harsh electrochemical conditions without active sites regeneration for a long-term test. We show that this unique Cu-CuAlO 2 -Al 2 O 3 catalyst exhibits ultradurable electrochemical CO 2 RR performance with an 85% C 2 Faradaic efficiency for a 300 h test. Such a simple interfacial engineering design approach unveiled in this work would be adaptable to develop various ultradurable catalysts for industrial-scale electrochemical CO 2 RR.