半胱氨酸在Ag_2S/Cu_2S纳米晶修饰玻碳电极上的电化学行为

Electrochemical Behavior of Cysteine at Ag_2S/Cu_2S Nanocrystals Modified Glassy Carbon Electrode

制备了Ag2S/Cu2S纳米混晶修饰玻碳电极,研究了半胱氨酸在Ag2S/Cu2S纳米混晶修饰电极上的电化学行为。结果表明:Ag2S/Cu2S混晶修饰电极对半胱氨酸的电化学氧化过程具有非常明显的电催化作用,其氧化电位减小为0.23V,氧化峰电流为25.98μA,与空白电极相比增加了8倍。在1.0×10-5～1.0×10-3 mol/L浓度范围内,稳态电流信号与半胱氨酸浓度呈现良好的线性变化关系。该修饰电极具有良好的稳定性和重现性。

Ag2 S/Cu2 S nanocrystals modified glassy carbon electrode（Ag2 S/Cu2 S/GCE） was fabricated and the electrochemical behavior of cysteine at the Ag2 S/Cu2 S/GCE was studied. The results showed that Ag2S/Cu2 S/GCE exhibited excellent electrocatalytieal activity to the electro-oxidation of cysteine. The potential of oxidation peak was 0.23 V and the peak current reached 25.98 uA. The steady-state current changed linearly with cysteine concentration in the range of 1.0 × 10^-5 1.0 × 10^- 3mol/L. The modified electrode exhibited good stability and repeatability.