Mechanism of Long-term Reduction of CO2 to Formic Acid on SnOx Electrode Enhanced by Pulse Strategy
SnOx is an efficient and active catalyst for the electrochemical reduction of carbon dioxide to produce formate.However,under traditional constant-potential CO2 reduction,SnOx tends to be reduced to lower-valent metal oxides or elemental metals,leading to decreased activity or even deactivation.The pulsed electrocatalysis technique enables dynamic regulation of active species on the electrode surface and it is easy to operate.There-fore,a pulsed strategy to enhance the catalyst stability of SnOx is used in the study.Experimental results indicate that under pulsed potential conditions,the SnOx electrode maintains good stability after 12 hours of electrolysis,with a Faradaic efficiency for formate production of approximately 40％,an improvement of 153％compared to constant-potential conditions.Based on physicochemical characterization and electrochemical testing,the outstand-ing catalytic stability is attributed to the pulsed oxidation potential,which promotes dynamic in-situ regeneration of SnOx on the electrode surface and facilitates the dispersion of active components.The research results provide a no-vel technical approach to enhance the stability of metal oxide electrodes for electrocatalytic CO2 reduction to for-mate.
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