Abstract
This work demonstrates simultaneously employing light and ultrasonic irradiation to improve the electrocatalytic reduction of CO2 on Co2SnO4/CuO/Cu foam. We have synthesized n-type Co2SnO4 nanoparticles on p-type substrate CuO/Cu foam via hydrothermal method then investigated electrocatalytic, sono-electrocatalytic, photo-electrocatalytic and sono-photo electrocatalytic responses of Co2SnO4/CuO/Cu foam in the CO2-saturated electrolyte. The UV–visible differential reflectance spectroscopy (DRS) experiment displayed that Co2SnO4/CuO/Cu foam harvests more visible light energy than CuO/Cu foam. In cyclic voltammetry (CV) investigations, the electrocatalytic response of the Co2SnO4/CuO/Cu foam occurred at a higher positive potential (ΔE = 0.46 V) than the CuO/Cu foam, andsolo application of ultrasound and light irradiation resulted in 1.3- and 1.4-fold increases in cathodic current density, respectively, while synchronized ultrasound and light irradiation resulted in a 1.8-fold increase during the electrocatalytic CO2 reaction on the Co2SnO4/CuO/Cu foam. Based on the electrochemical impedance spectroscopy (EIS) tests, the formation of p-n heterojunction on Cu foam decreased charge transfer resistance from 198.8 Ω to 48.79 Ω, and under sono-photo irradiation, charge transfer irradiation resistance on Co2SnO4/CuO/Cu foam receded to 32.96 Ω. The chronoamperometry technique followed by gas chromatography-mass spectrometry revealed acetaldehyde and propylene glycol as CO2 conversion products with a 66 % coulombic efficiency.
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