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A recent class of porous materials, viz., metal-organic frameworks (MOFs), finds applications in several areas. In this work, Cu-based MOFs (Cu-benzene-1,3,5-tricarboxylic acid) along with graphene oxide, viz., Cu-MOF/GO, are synthesized and used further for reducing CO 2 electrochemically. The reduction was accomplished in various supporting electrolytes, viz., KHCO 3 /H 2 O, tetrabutylammonium bromide (TBAB)/dimethylformamide (DMF), KBr/CH 3 OH, CH 3 COOK/CH 3 OH, TBAB/CH 3 OH, and tetrabutylammonium perchlorate (TBAP)/CH 3 OH to know their effect on product formation. The electrode fabricated with the synthesized material was used for testing the electroreduction of CO 2 at various polarization potentials. The electrochemical reduction of CO 2 is carried out via the polarization technique within the experimented potential regime vs saturated calomel electrode (SCE). Ion chromatography was employed for the analysis of the produced products in the electrolyte, and the results showed that HCOOH was the main product formed through reduction. The highest concentrations of HCOOH formed for different electrolytes are 0.1404 mM (-0.1 V), 66.57 mM (-0.6 V), 0.2690 mM (-0.5 V), 0.2390 mM (-0.5 V), 0.7784 mM (-0.4 V), and 0.3050 mM (-0.45 V) in various supporting electrolyte systems, viz., KHCO 3 /H 2 O, TBAB/DMF, KBr/CH 3 OH, CH 3 COOK/CH 3 OH, TBAB/CH 3 OH, and TBAP/CH 3 OH, respectively. The developed catalyst accomplished a significant efficiency in the conversion and reduction of CO 2 . A high faradic efficiency of 58% was obtained with 0.1 M TBAB/DMF electrolyte, whereas for Cu-MOF alone, the efficiency was 38%. Thus, the work is carried out using a cost-effective catalyst for the conversion of CO 2 to formic acid than using the commercial electrodes. The synergistic effect of GO sheets at 3 wt % concentration and Cu + OH - interaction leads to the formation of formic acid in various electrolytes.

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Investigation on Electroreduction of CO2 to Formic Acid Using Cu3(BTC)2 Metal–Organic Framework (Cu-MOF) and Graphene Oxide