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The electrochemical reduction of carbon dioxide (CO₂) has been treated as a clear and efficient method to face global challenges which are resulted from extra emission of CO₂ into the atmosphere. In CO₂ electroreduction, Sn metal was reported to be the most active electrode towards CO₂ electroreduction in aqueous electrolytes, producing formic acid. However, there technology advances are still not sufficient for practical applications. Moreover, the deactivation of Sn metal electrodes in CO₂ reduction was found to be fast, especially in aqueous solutions. With respect to these, developing new material synthesis technology to give innovative new catalysts with optimal performance is the priority.