修饰的GC电极上CO_2的电催化还原

The Electro-catalytic Reduction of CO_2 on Modified GC Electrodes

研究了高压及常压下玻碳电极还原CO2的反应,以及钴酞菁修饰玻碳电极的电还原CO2行为。结果表明,玻碳电极常压下即可还原CO2,但法拉第效率极低。高压下法拉第效率大大提高,可将CO2还原为CO(31%)和HCOOH(15%)。若用钴钛菁修饰玻碳电极常压下即可将CO2还原,法拉第效率可达30%。

Electrochemical reduction of CO2 under atmospheric and high pressure on glassy carbon (GC) electrodes and modified GC electrodes were investigated. The faradaic efficiency is very low under 0.1 MPa on GC electrode. But under high pressure on GC electrode the faradaic efficiency increased; CO2 was reduced to CO and formic acid with a faradaic efficiency of 31% and 15% respectively in 0.1mol/l KHCO3 aqueous electrolyte. In addition, on a modified GC electrode of Cobalt phthalocyanine under 0.1 MPa could electrochemically reduce CO2 to CO with a faradaic efficiency of 30%. In the end, the reaction mechanism is discussed.