Lysine‐Functionalized SnO2 for Efficient CO2 Electroreduction into Formate

Abstract Electroreduction of CO 2 to HCOO − can be considered as the most economically valuable process. Herein, we developed lysine‐functionalized SnO 2 nanoparticles (SnO 2 ‐lys) as an efficient catalyst for the electroreduction of CO 2 into HCOO − . During CO 2 electroreduction, SnO 2 ‐lys achieved a Faradaic efficiency for HCOO − of higher than 80% over a wide range of applied potentials from −0.5 V to −2.3 V versus reversible hydrogen electrode ( vs . RHE). Notably, the partial current density for HCOO − reached as high as −351.9 mA cm −2 at −2.3 V vs . RHE. On account of kinetic analysis and mechanistic study, lysine‐functionalized SnO 2 facilitated faradaic process and accelerated reaction kinetics via enhancing the CO 2 activation, thus promoting the catalytic performance of the electroreduction of CO 2 into HCOO − .