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Carbon Dioxide (CO2) Electrocatalytic Recycling on Electrodeposited Nanostructured Copper-Gold Electrodes

Wednesday, 31 May 2017
Grand Ballroom (Hilton New Orleans Riverside)
K. A. Gandionco, D. M. Sua-an, J. A. D. del Rosario, and J. D. Ocon (University of the Philippines Diliman)
The electrocatalytic reduction of carbon dioxide (CO2) into hydrocarbons is considered as one of the promising solutions to the pressing problems related to energy and climate change as it can reduce atmospheric CO2 concentration and produce carbon-neutral energy. In this work, copper and gold on cabon fiber paper (Cu-Au/CFP) were studied as electrocatalysts for CO2 reduction. The electrocatalysts were synthesized via co-electrodeposition of metal precursors by applying a constant potential on an electrolyte solution containing cupric sulphate pentahydrate, gold (III) chloride trihydrate, and sulfuric acid. The concentration of the gold metal precursor in the electrolyte solution was varied from 5 to 50 mM whereas that of the copper metal precursor was kept constant at 0.40 M. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to characterize the morphology and crystallinity of the as-prepared electrocatalysts, respectively. It was determined through SEM that the as-prepared electrocatalysts are made of spherical and porous nanostructures. Fern-like structures were also observed to form when the concentration of the gold metal precursor in the electrolyte solution was increased. XRD analysis showed that Cu (III) dominated all other crystal structures in copper and gold electrocatalysts. The faradaic efficiencies of the electrochemical reduction of CO2 for alcohol and formate of the as-prepared electrocatalysts were found to be considerably higher as compared to that of copper electrode. The insights that are obtained through this study can be a guide for the synthesis of a better catalyst for CO2 electrocatalytic reduction.