摘要
采用循环伏安法(CV)在碳糊电极(CPE)上通过共聚的方式电聚合制备了聚中性红/Ni2+修饰碳糊电极(Ni2+/PNR/CPE),该修饰电极在0.1mol.L-1NaOH溶液中扫描活化后,在0.531V/0.348V处有一对明显的氧化还原峰,表明Ni2+离子已掺杂于聚合膜中。分别运用扫描电子显微镜(SEM)和X射线能谱仪(EDS)观测并分析了聚合膜的表面形貌及组成。研究结果表明:Ni2+/PNR/CPE在碱性介质中对葡萄糖的氧化具有明显的电催化作用。探讨了最佳实验条件;计算了葡萄糖的部分动力学参数:电荷转移系数(α=0.6970)及电极反应速率常数(k=2.003×103cm3.mol-1.s-1);葡萄糖的氧化峰电流与浓度在1.0×10-5mol.L-1～1.0×10-2mol.L-1范围内表现出良好的线性关系,检出限为5×10-6mol.L-1(S/N=3),该修饰电极制备方法简单、灵敏度高、稳定性好,用于实际样品中葡萄糖的含量分析,结果令人满意。
A poly（ neutral red）/Ni^2＋ modified carbon paste electrode （PNR/Ni^2＋/CPE）is fabricated by the electrochemical polymer- ization on carbon paste electrode （CPE）by cyclic voltammetry（CV） with Ni （II）ions incorporated in polymerized solution. A couple of redox current peaks are appeared at 0. 531V and 0. 348V after scanning in 0. lmol ~ L-~ NaOH solution,which indicated that Ni^2＋ has been embedded into the polymerized film. The structural morphology and composition of the polymerized film are character- ized using scanning electron microscope （ SEM ） and energy dispersive spectrometry （EDS）. The experimental results indicate that PNR/Ni^2＋/CPE shows a strong electrocatalytic ability towards the oxidation of glucose in alkaline solutions. The optimal experimen- tal conditions for the determination of glucose are discussed in detail. And some kinetic parameters such as the electron transfer eoe- ficient （ α = 0. 6970） and the electrode reaction rate constant （ k = 2. 003 × 10^3 cm^ 3· mol^-1 · s^-1 ） of glucose are calculated. The oxida- tion peak currents and concentrations of glucose have a good linear relationship in the range from 1.0×10^-5mol·L^-1to 1.0×10^-2mol·L^-1 with a detection limit of 5. 0×10^-6mol·L^-1（ S/N= 3 ）. Furthermore, the preparation process of PNR/Ni^2＋/CPE is simple, which has high sensitivity and good stability. It can be applied to the quantitative determination of glucose in practical samples with satisfactory results.
出处
《化学研究与应用》
CAS
CSCD
北大核心
2013年第6期812-817,共6页
Chemical Research and Application
关键词
中性红
NI2+
电聚合
碳糊电极
葡萄糖
neutral red
Ni^2＋ electropolymerization
carbon paste electrode
glucose
