Selective Reduction of Carbon dioxide to Formate by using Electrochemical method
Date15th Mar 2022
Time04:00 PM
Venue Virtual Mode
PAST EVENT
Details
Conversion of CO¬2 into valuable chemicals and fuels has received widespread attention as a way to tackle the increased CO2 emissions (Gattrell, Gupta and Co, 2006) and also reduced the dependence on fossil fuels . There are different techniques for CO2 conversion to value-added products, where electrochemical reduction (ECR) of carbon dioxide into chemical fuels is identified as a promising way since energy efficiency is high and the products, especially the chemical fuels can be readily stored. Copper (Cu) has a unique property of producing hydrocarbons and appears to be a promising candidate as a catalyst for the ECR (Kaneco et al., 1999). However, Cu generates a range of reaction products and has low formic acid selectivity. To improve its selectivity, there have been several studies with metal alloys, and among them, tin (Sn), bismuth (Bi), indium (In) was found to be selective towards formic acid production. In this work, a 3D foam of copper is electrochemically deposited on to Cu foil (f-Cu) and Cu mesh (f-Cu mesh). The deposition parameters for the electrodeposition of Sn on 3D Cu foam (Sn/f-Cu) were optimized and investigated for their activity towards the ECR of CO2. SEM and EDX were employed for the physical characterization of the electrodes, while formic acid was quantified using ion chromatography. The results indicate that Sn/f-Cu mesh electrode showed better performance for ECR of CO2 to formic acid compared to Sn deposited copper foil (Sn/Cu) and bare copper foam. Among the various potentials investigated, Sn/f-Cu mesh achieved 83 % maximum faradaic efficiency at -1.6V vs Ag/AgCl and the highest rate of formic acid production of 350 µmol/hr.cm2 was achieved at -1.8V vs Ag/AgCl which is nearly seven times higher than Sn/Cu at the same potential. Other formic acid selective catalysts such as Bi/f-Cu mesh and In/f-Cu mesh will be done for similar analysis. Finally, the optimized electrode will be scaled up for CO2 reduction using electrolyser.
Speakers
Mr. Y.S. Sivaram Prasad, CH17D405
Chemical Engineering