In
this article, we have reported the electrochemical reduction
of CO2 in a continuous semi-micro reactor for the synthesis
of formic acid (HCOOH). The reactor was fabricated with polydimethylsiloxane
by following the microwire molding technique. Tin (Sn) nanocatalyst-deposited
graphite rod was used as the cathode for the electrochemical reduction
of CO2 to HCOOH. We performed the reactions in an alkaline
environment at different pH values and different applied voltages
for 1200 s to obtain an optimum condition for HCOOH production. The
maximum Faradaic efficiency (FE) values of 84.25 and 57.69% were obtained
at 2.5 and 3 V, respectively, after 300 s at an initial pH value of
9.5. It was found that the continuous reactor showed higher FE values
than the batch reactor. It was also noted that the HCOOH concentration
in the batch reactor was continuously decreasing with time, whereas
it was almost constant in the continuous semi-micro reactor.
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