Au_(25)/L-半胱氨酸修饰金电极上CO_2的电化学还原

The electrochemical reduction of CO_2 on Au_(25)/L-cysteine electrode

采用自组装方式制备GNPs/L-Cys/Au和Au_(25)/L-Cys/Au修饰电极,构造不同的CO_2电化学还原界面.利用线性扫描伏安法和红外光谱电化学技术研究修饰电极上CO_2电化学行为.电化学结果表明:与Au电极相比,在GNPs/L-Cys/Au电极上,CO_2还原过电位降低了将近190 mV;而在Au_(25)/L-Cys/Au电极上,过电位降低了将近280mV,Au_(25)/L-Cys/Au电极表现出更好的CO_2电化学催化效果.结合红外光谱电化学结果提出了CO_2在Au_(25)/L-Cys/Au电极上可能的还原机制.

The GNPs/L-Cys/Au and Au25/L-Cys/Au modified electrodes were prepared by self-assembly method to construct different electrochemical reduction interfaces of CO2.The electrochemical reduction of CO2 on modified electrodes was studied by linear sweep voltammetry and FTIR spectroelectrochemistry.The electrochemical results showed that the overpotential of CO2 on the GNPs/L-Cys/Au electrode was reduced by nearly 190 mV compared to the Au electrode and the overpotential of CO2 on the Au25/L-Cys/Au electrode was reduced by nearly 280 mV.This indicated that Au25/L-Cys/Au modified electrode had better catalytic effect than GNPs/L-Cys/Au modified electrode.The mechanism of CO2 reduction on Au25/L-Cys/Au modified electrode was proposed by FTIR spectroelectrochemistry.