Li, Qing-yuan, et al. Journal of Electroanalytical Chemistry 785 (2017): 229-234.
Tetrabutylammonium perchlorate (TBAP) serves as a supporting electrolyte for the electrochemical reduction of carbon dioxide (CO2) into carbon monoxide (CO) in organic media.
Experimental Protocol: A two-compartment electrolysis cell separated by a Nafion 117 membrane is used. The catholyte is CO2-saturated 0.1 M TBAP in N-methyl pyrrolidone (NMP), and the anolyte is 0.1 M H2SO4 aqueous solution. A gold sheet cathode and graphite rod anode are employed. Potentiostatic electrolysis is conducted at -2.4 V versus Fc/Fc+ at 25°C. The gaseous products are analyzed by gas chromatography.
Performance Evaluation: The cathodic current density reaches 6.6 mA/cm2 at -2.4 V. The highest Faradaic efficiency for CO formation reaches 93% after 40 min of electrolysis. No deactivation of the Au electrode is observed during long-term electrolysis. The NMP/TBAP electrolyte prevents poisoning of the cathode, as confirmed by SEM analysis, demonstrating excellent stability for CO2 electroreduction.