Zn- and Ti-doped SnO2 for enhanced electroreduction of carbon dioxide
Autor: | Micaela Castellino, Angelica Chiodoni, Adriano Sacco, Nicolò B. D. Monti, Katarzyna Bejtka, M. Amin Farkhondehfal, Candido Pirri, Juqin Zeng, Samuele Porro |
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Jazyk: | angličtina |
Rok vydání: | 2021 |
Předmět: |
Technology
Materials science Formic acid HCOOH production Doped SnO reduction 02 engineering and technology Mesoporous 010402 general chemistry Electrocatalyst 01 natural sciences 2 catalyst Electrochemical CO Oxygen vacancy Catalysis chemistry.chemical_compound doped SnO2 catalyst electrochemical CO2 reduction General Materials Science Microscopy QC120-168.85 QH201-278.5 Doping Energy conversion efficiency Engineering (General). Civil engineering (General) 021001 nanoscience & nanotechnology TK1-9971 0104 chemical sciences Descriptive and experimental mechanics Chemical engineering chemistry Reversible hydrogen electrode Electrical engineering. Electronics. Nuclear engineering TA1-2040 0210 nano-technology Faraday efficiency Carbon monoxide |
Zdroj: | Materials Volume 14 Issue 9 Materials, Vol 14, Iss 2354, p 2354 (2021) |
Popis: | 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 cm−2. 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. |
Databáze: | OpenAIRE |
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