Synthesis of Рorous Bimetallic Nanocatalyst for Selective Formate Production by CO2 Еlectroreduction

Abstract The Ag2SnO3 nanoparticles were prepared by a simple and cost-effective chemical reduction method. Here we present the electrochemical conversion of CO2 to formate in aqueous electrolyte media at pH 6.8. The two-compartment cell (H type cell) was used for electrochemical measurements. The absorption maxima, the energy bandgap, surface morphology, catalytic composition, crystallinity, crystallite size, crystal facet, and electrochemical activity of the electrocatalyst were probed. The linear sweep voltammetry was used to record the polarization curve/current response. The catalyst shows porous/sponge-like morphology. The electrochemical results show higher current density (~26 mA/cm2), long term stability, product selectivity, and higher faradaic efficiency (FE) on the bimetallic electrocatalyst electrode. The highest FE for the only liquid product (formate) was 89% at –1.3 V vs. Ag/AgCl with a Tafel slope of 174 mV/decade. The faradaic efficiency was found high as compared to the monometallic (Ag, Sn) nanoparticles. The high FE and product selectivity indicate the synergistic effect between these metals.