Mn-doped atomic SnO2 layers for highly efficient CO2 electrochemical reduction†
An efficient catalyst is the key to the application of the electrocatalytic CO2 reduction reaction (CO2RR). Herein, we report a facile in situ gas induced growth strategy to synthesize Mn-doped SnO2 (TMO) with a thickness of 3–4 atomic layers for highly efficient CO2 electroreduction. Compared with commercial SnO2, TMO (with 11.86 wt% Mn) exhibits enhanced performance with a higher current density (∼21.2 mA cm−2), higher faradaic efficiency (∼85%) and lower overpotential (240 mV) for formic acid formation. The total faradaic efficiency for CO2 conversion reaches ∼91.6%. X-ray fine structure and density functional theory studies reveal that the ultrathin nanostructure not only features a shrunken energy gap for electron transfer but also exposes more surface active sites. Meanwhile, Mn doping modulates the electronic configuration of SnO2 and generates a large amount of oxygen vacancies. The designed ultrathin structure and Mn doping remarkably decreased the energy barrier of electron transportation on the TMO surface during the CO2RR.
- This article is part of the themed collection: 2019 Journal of Materials Chemistry A HOT Papers