Conclusively, we studied the fixation of CO2 on a polypyrrole
modified Cu for the first time with the ultimate goal to obtain
usable fuel substances such as CH4 and HCOOH. The coating of the
Cu surface with polypyrrole leads to a controlled hydrogen evolution
and compared to the blank Cu as electro-catalyst, formation
of hydrocarbons begins at lower overpotentials with high Faradaic
efficiencies. In this sense, a successfully conversion of waste CO2
in technical scale could be a benefitable process from the point of
environmental view whereby optimum reaction conditions were
determined with variation of some significant parameters such
as potential, pressure, film thickness and concentration of proton
donors in the electrolytic medium. With the establishing optimum
values of mentioned parameters, the highest Faradaic efficiencies
(ca. 25% for CH4 and 20% for HCOOH) were obtained, as known until
now.