N‐doped Ti3C2Tx MXene‐regulated metal‐oxide facilitates the efficient electrocatalytic CO2 reduction to CO

Abstract CO 2 electroreduction reaction (CO 2 ER) provides a promising pathway for scaling up the conversion of CO 2 to CO using renewable electricity, thereby providing an alternative potential pathway to carbon neutrality. Typically, the reaction conducted in aqueous media is an ideal way on the standpoint of sustainability. However, the undesired hydrogen evolution reaction (HER) is feasible to occur on catalyst surface together with CO 2 ER, thereby reducing the overall CO 2 ‐to‐CO efficiency. In this work, we utilized the stacked structure of N‐doped Ti 3 C 2 T x MXene material supported metal oxide (ZnO) to form a ZnO/N‐Ti 3 C 2 T x catalyst in electrolytic CO 2 reduction to CO. The catalyst exhibited an Faradaic efficiency (FE CO ) of 96.4 % in CO 2 ER at −0.967 V ( vs . RHE) with a current density of 7.2 mA cm −2 . ZnO acted as the active site for CO 2 ER in ZnO/N‐Ti 3 C 2 T x , while N‐doped Ti 3 C 2 T x MXene was responsible for enhancing textural properties and electrical conductivity, which could promote the mass transfer of gas molecules and electron transfer to ZnO active sites, and further improving the activity. This work inspires the rational design of unique metal oxide/N‐Ti 3 C 2 T x interfaces to regulate the high‐performance electrocatalytic selectivity of CO 2 reduction.