Nickel Doping in Atomically Thin Tin Disulfide Nanosheets Enables Highly Efficient CO 2 Reduction

Engineering electronic properties by elemental doping is a direct strategy to design efficient catalysts towards CO 2 electroreduction. Atomically thin SnS 2 nanosheets were modified by Ni doping for efficient electroreduction of CO 2 . The introduction of Ni into SnS 2 nanosheets significantly enhanced the current density and Faradaic efficiency for carbonaceous product relative to pristine SnS 2 nanosheets. When the Ni content was 5 atm %, the Ni‐doped SnS 2 nanosheets achieved a remarkable Faradaic efficiency of 93 % for carbonaceous product with a current density of 19.6 mA cm −2 at −0.9 V vs. RHE. A mechanistic study revealed that the Ni doping gave rise to a defect level and lowered the work function of SnS 2 nanosheets, resulting in the promoted CO 2 activation and thus improved performance in CO 2 electroreduction.