Black reduced porous SnO2 nanosheets for CO2 electroreduction with high formate selectivity and low overpotential

Release time:2023-10-19 Hits:

Key Words:Density functional theory;Carbon dioxide - Carrier concentration - Electrocatalysts - Electrolytic reduction - Nanosheets - Oxygen vacancies

Abstract:The great bottleneck that lies in CO<inf>2</inf> reduction reaction (CO<inf>2</inf>RR) electrocatalysts is to simultaneously enhance their conductivity and density of active sites. Herein, we developed a black reduced porous SnO<inf>2</inf> nanosheets electrocatalyst that enabled possessing both metallic conductivity and high density of active sites via vacancy engineering. The black reduced porous SnO<inf>2</inf> nanosheets showed high activity and selectivity for CO<inf>2</inf>RR to formate, with maximum Faradaic efficiency (FE) of 92.4% at the low overpotential of 0.51 V and stable FE of 90 ± 2% in the large potential range from -0.6 to -1.1 V vs. reversible hydrogen electrode (RHE). Density functional theory (DFT) calculations indicated that the introduction of oxygen vacancy increased carrier density and lowered the adsorption of HCOO^- * and HCOOH by 0.29 and 0.17 eV, respectively, accounting for the improved CO<inf>2</inf>RR to formate performance.<br/> © 2019 Elsevier B.V.

Volume:260

Issue:wu

Translation or Not:no