Proceedings of nanoGe Fall Meeting 2021 (NFM21)
Publication date: 23rd September 2021
The electrocatalytic reduction of CO2 into useful fuels, exploiting rationally designed,
inexpensive, active, and selective catalysts, produced through easy, quick, and scalable routes,
represents a promising approach to face today’s climate challenges and energy crisis. This work
presents a facile strategy for the preparation of doped SnO2 as an efficient electrocatalyst for the
CO2 reduction reaction to formic acid and carbon monoxide. Zn or Ti doping was introduced into
a mesoporous SnO2 matrix via wet impregnation and atomic layer deposition. It was found that
doping of SnO2 generates an increased amount of oxygen vacancies, which are believed to contribute
to the CO2 conversion efficiency, and among others, Zn wet impregnation resulted the most efficient
process, as confirmed by X-ray photoelectron spectroscopy analysis. Electrochemical characterization
and active surface area evaluation show an increase of availability of surface active sites. In particular,
the introduction of Zn elemental doping results in enhanced performance for formic acid formation,
in comparison to un-doped SnO2 and other doped SnO2 catalysts. At -0.99 V versus reversible
hydrogen electrode, the total faradaic efficiency for CO2 conversion reaches 80%, while the partial
current density is 10.3 mA cm2. These represent a 10% and a threefold increases for faradaic
efficiency and current density, respectively, with respect to the reference un-doped sample. The
enhancement of these characteristics relates to the improved charge transfer and conductivity with
respect to bare SnO2.
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