Electrocatalytic Oxidation of Nitrite at Gold Nanoparticle‐ polypyrrole Nanowire Modified Glassy Carbon Electrode
Electrocatalytic Oxidation of Nitrite at Gold Nanoparticle‐ polypyrrole Nanowire Modified Glassy Carbon Electrode
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DOI：
10.1002/cjoc.201090011
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发表时间：
2009-12
影响因子：
5.4
通讯作者：
Jing Li
中科院分区：
文献类型：
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作者：
Jing Li
开发了一种基于聚吡咯纳米线上分散金纳米颗粒的新型化学修饰电极，采用循环伏安法、差示脉冲伏安法和计时电流法研究了亚硝酸盐的氧化行为。测定了亚硝酸根氧化反应的扩散系数D、电子转移系数α和电荷转移速率常数k。该修饰电极对亚硝酸根的氧化具有很高的电催化活性。亚硝酸根浓度在8.0×10−7 - 2.5×10−3 mol·L−1范围内与催化峰电流呈良好的线性关系，检出限为1.0×10−7 mol·L−1（s/n=3）。该方法用于水样中亚硝酸根的测定，结果令人满意。该传感器具有良好的灵敏度、抗干扰能力、重现性和稳定性。
A novel chemically modified electrode based on the dispersion of gold nanoparticles on polypyrrole nanowires has been developed to investigate the oxidation behavior of nitrite using cyclic voltammetry, differential pulse voltammetry and chronoamperometry techniques. The diffusion coefficient (D), electron transfer coefficient (α) and charge transfer rate constant (k) for the oxidation of nitrite were determined. The modified electrode exhibited high electrocatalytic activity toward the oxidation of nitrite. The catalytic peak current was found to be linear with nitrite concentrations in the range of 8.0×10−7−2.5×10−3 mol·L−1 with a detection limit of 1.0×10−7 mol·L−1 (s/n=3). The proposed method was successfully applied to the detection of nitrite in water samples with obtained satisfactory results. Additionally, the sensor also showed excellent sensitivity, anti-interference ability, reproducibility and stability properties.