Reação de redução de CO2 usando partículas de Cobre em Óxido de Grafeno reduzido.

Abstract

Carbon dioxide (CO2) emissions are among the primary drivers of climate change. A promising strategy to mitigate this issue involves the conversion of CO2 into value-added compounds via electrocatalysis. In this study, we explored the synthesis and application of a nanocomposite composed of copper nanoparticles supported on reduced graphene oxide (CuNPs/rGO) as an electrocatalyst for CO2 reduction. Copper was chosen due to its resistance to catalytic poisoning and its capacity to form various chemical products, while the rGO support enhances electron transfer and lowers the required reduction potential. The material’s morphology was examined through scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). Cyclic voltammetry (CV), linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS), and chronoamperometry (CA) were employed to characterize the electrocatalytic performance of the CuNPs/rGO. Results showed a CO2 reduction onset potential of -0.6 V (vs NHE), a specific capacitance of 30 F/g, and a 19-fold increase in spent charge after the second chronoamperometry test, indicating enhanced electrode activation, low electrochemical impedance, and positive catalytic stability and activity.