Fabrication of a Silver Nanoparticle/polydopamine Modified Glassy Carbon Electrode and Its Electrocatalytic Reduction for p-Nitrophenol
Fabrication of a Silver Nanoparticle/polydopamine Modified Glassy Carbon Electrode and Its Electrocatalytic Reduction for p-Nitrophenol
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纳米银/聚多巴胺修饰玻碳电极的制备及其对硝基苯酚的电催化还原
DOI：
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发表时间：
2010-08
影响因子：
1
通讯作者：
Su Bi-Quan
中科院分区：
文献类型：
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作者：
Wang Chun-Ming;Zhang Yu-Zhen;Du Yong-Ling;Su Bi-Quan
采用电聚合和脉冲电沉积的方法，在聚多巴胺薄膜下成功制备了银粒子修饰的玻碳电极。对扫描电镜图像的详细分析表明，在脉冲电沉积条件下获得的银沉积物，与未修饰的玻璃碳表面相比，在过度氧化的聚多巴胺底物上表现得均匀致密，晶体分散得很好。通过还原对硝基苯酚（pNP），对制备的纳米银/聚多巴胺修饰玻碳电极（Ag/PDA/GC）进行了电化学表征。在Ag/PDA/GC电极上，化合物的还原所需电位明显小于在未修饰的玻碳电极上观察到的负电位。pNP浓度与电流响应在4 × 10(-5)-3 × 10(-4) mol/L范围内呈线性关系。Ag/PDA/GC法可用于有毒硝基酚的检测。
A glassy carbon electrode modified with silver particles under polydopamine film was prepared successfully by means of electropolymerization and pulsed electrodeposition. A detailed analysis of the scanning electron microscope images reveals that silver deposit, obtained under pulsed electrodeposition conditions, appears as homogeneously compact and the crystallites are well dispersed on the overoxidized polydopamine substrate than that observed on the unmodified glassy carbon surfaces. The resulting silver nanoparticle/polydopamine modified glassy carbon electrode(Ag/PDA/GC) was electrochemically characterized through the reduction of p-nitrophenol(pNP). The potential needed for the reduction of the compound on the Ag/PDA/GC electrode is significantly less negative than that observed on the unmodified glassy carbon electrode substrates. A linear relationship between pNP concentration and current response was obtained in the range of 4 x 10(-5)-3 x 10(-4) mol/L. The Ag/PDA/GC would be used in the practical application for detecting toxic nitrophenols.