Electrochemical reduction of CO2 to C2 products—effect of surfactant on copper electrodeposition

Abstract

Rapid hydrocarbon depletion and environmental concerns have prompted researchers to examine electrocatalytic reduction of carbon dioxide to manufacture value-added substances using sustainable energy. In the present research work, the electrodeposition of copper on copper (Cu) with cetyltrimethyl ammonium bromide (CTAB) (Cu/Cu-WC) and without CTAB (Cu/Cu-WOC) at a constant potential of − 0.5 V vs. Ag/AgCl is reported. CTAB as a capping agent and molecular promotor for the reduction of CO2. Scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) analyses are used to characterize the prepared electrodes. Cyclic voltammetry studies show difference in current density (− 57 mA/cm2) for reduction of CO2 than compared to inert gas for Cu/Cu-WC. Chronoamperometric techniques are applied for electrolysis. During electrolysis, Cu/Cu-WC shows ethylene with a Faradaic efficiency (FE) of 66% while that of bare copper is 10%.