Hossein A. Alinajafi, Ali A. Ensafi, B. Rezaei

a b s t r a c t
In this study, the surface of reduced graphene oxide (rGO) was modified with adenine via diazonium reaction. Then, to prepare Pt@Adenine-rGO, Pt was deposited on the surface of adenine-rGO, using cyclic voltammetry in the range of
0.30 to þ1.30 V at a scan rate of 100 mV s
1 in a solution containing Pt salt. Afterward, it was characterized by various techniques such as scanning electron microscopy, X-ray photoelectron spectroscopy, and infrared spectroscopy. Electrochemical studies showed the efficient electrocatalytic behavior of Pt@Adenine-rGO for the reduction of CO2 to methanol at
0.30 V. The products formed on the surface of Pt@Adenine-rGO were monitored using different techniques including Raman spectroscopy, gas chromatography, gas chromatography-mass spectrometry, and 13C NMR spectroscopy. Our findings indicated that methanol with a reasonably high Faradaic efficiency up to 85% and a current density of 0.5 mA cm
2 as the main product of CO2 reduction on the surface of Pt@Adenine-rGO.

Keywords:
CO2 reduction, Methanol, Pt@Adenine modified reduced, graphene oxide, Electrocatalyst