Electrochimica Acta, Vol.43, No.8, 899-907, 1998
Electrochemical reduction of carbon dioxide at Ti and hydrogen-storing Ti electrodes in KOH-methanol
The electrochemical reduction of carbon dioxide was investigated with titanium electrode and hydrogen-storing Ti (Ti + H) electrode in 100 mM KOH-methanol electrolyte. By the electroreduction of CO2, the main products were formic acid and carbon monoxide. In general, CO formation on Ti + H electrode was larger than that on Ti electrode. The current efficiency for formic acid formation on Ti electrode was larger than that for CO formation. However, on Ti + H electrode CO formation was larger than formic acid formation at relatively positive potential and higher temperature. The best CO formation (32%) was obtained with Ti + H electrode at -2.2 V and -30 degrees C. A maximum efficiency of formic acid was 44% with Ti + H electrode at -2.1 V and -30 degrees C. Hydrogen formation increased with temperature and negative potential and was depressed at relatively low temperature.
Keywords:LOW-TEMPERATURE;ELECTROLYTES