NiFe3 alloy ingot was metallurgically prepared to simulate the Ni/Fe ratio in most high Ni steels. Electrochemical conditioning of this alloy in KSCN and KOH solutions proved effective in compositional modulation and morphologic...
The Effect of SnO2 Surface Properties on CO2 Photoreduction to Higher Hydrocarbons
Von Wiley-VCH zur Verfügung gestellt
CO2 photoreduction using SnO2 under UV radiation lead to CO, C2H4, and C2H6, with higher selectivity for CH4. The same reaction under visible light using Au-decorated SnO2 produces CH4 and a smaller amount of CO but in much lower yields. Although the SnO2 band structure does not indicate a good semiconductor for CO2 reduction, its surface characteristics are responsible for its catalytic activity, and it does not act as a simple support for other catalysts, as plasmonic metals.
Several photocatalysts have been developed for applications in reduction reactions, including tin oxide-based semiconductors. Although its band structure is unfavorable for CO2 reduction reactions, strategies to modify its surface properties directly impacted its activity and selectivity during these reactions. Here, we analyze the influence of heat treatment and decoration of SnO2 with gold nanoparticles on the gas phase CO2 photoreduction process. In both cases, a deleterious effect was observed during reactions under UV radiation (with a drop of 59.81 % and 51.45 % in CH4 production for SnO2_150 °C and SnO2/Au_cop, respectively, compared to SnO2_cop), which is directly related to the availability of surface hydroxyl groups that play a crucial role in CO2 adsorption. Under visible radiation, the gold plasmonic resonance took place in the production of methane (0.33 μmol g−1 for SnO2/Au_cop and 0.29 μmol g−1 for SnO2/Au_150 °C), with small amounts of carbon monoxide (0.06 μmol g−1 for SnO2/Au_cop and 0.03 μmol g−1 for SnO2/Au_150 °C). These results demonstrate that, though the SnO2 band structure does not indicate a good semiconductor for CO2 reduction, its surface characteristics are responsible for its catalytic activity.Zum Volltext
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