Leaching-resistant SnO2/g-Al2O3 nanocatalyst for stable electrochemical CO2 reduction into formate

다국어 초록 (Multilingual Abstract)

Tin(IV) oxide (SnO2) is the catalyst most commonly used for electrochemical reduction of CO2 intoformate. However, the electrocatalytic performance of SnO2 is not ensured due to its poor long-termstability. Here, we report our study on the electrochemical stability of SnO2 for 152 h and describe anapproach to achieve stable SnO2 electrodes using a g-alumina (g-Al2O3) support. The g-Al2O3 reduces theleaching of Sn from the supported-SnO2 during CO2 electrolysis due to the strong interaction of thesupport with the electrocatalyst. This maintains the particle size, morphology, and crystallinity of SnO2.
Thereby, pulverization of SnO2 is prevented and stable selectivity towards CO2 reduction results. Theprepared SnO2/g-Al2O3 exhibits much more stable Faradaic efficiency (65.0% at 152 h) and partial currentdensity (21.7 mA cm 2 at 152 h) for formate synthesis than does unsupported SnO2 electrocatalyst (14.2%Faradaic efficiency; 4.6 mA cm 2 of partial current density at 152 h).

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