Nanostructured Tin Catalysts for Selective Electrochemical Reduction of Carbon Dioxide to Formate
2014-02-05T00:00:00Z (GMT) by
High surface area tin oxide nanocrystals prepared by a facile hydrothermal method are evaluated as electrocatalysts toward CO2 reduction to formate. At these novel nanostructured tin catalysts, CO2 reduction occurs selectively to formate at overpotentials as low as ∼340 mV. In aqueous NaHCO3 solutions, maximum Faradaic efficiencies for formate production of >93% have been reached with high stability and current densities of >10 mA/cm2 on graphene supports. The notable reactivity toward CO2 reduction achieved here may arise from a compromise between the strength of the interaction between CO2•– and the nanoscale tin surface and subsequent kinetic activation toward protonation and further reduction.