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采用溶液还原法将铂镍负载于多壁碳纳米管(MWCNTs)制备Pt-Ni/MWCNTs复合催化剂。利用透射电子显微镜(TEM)、X射线衍射仪(XRD)对制备的复合催化剂进行结构表征,结果表明,铂镍均匀负载到碳纳米管上,Pt-Ni粒子粒径约为2 nm。XRD分析结果表明,复合催化剂是以Pt晶格为基础的固溶体结构。采用循环伏安法和计时电流法在碱性条件下对Pt-Ni/MWCNTs修饰电极进行电化学性能测试,结果表明,Pt-Ni/MWCNTs可直接催化葡萄糖氧化,对葡萄糖的灵敏度为571.68μA·mmol/(L·cm~2),线性范围1.0×10~(-5)~8.2×10~(-3)mol/L(R=0.999 4),检测限为0.5μmol/L(S/N=3)。此外,该电极对葡萄糖有良好的电催化氧化性能,且选择性和重现性好,可有效避免抗坏血酸、尿酸和多巴胺的干扰。
Pt-Ni / MWCNTs composite catalysts were prepared by loading platinum-nickel onto multi-walled carbon nanotubes (MWCNTs) by solution reduction. The prepared composite catalysts were characterized by transmission electron microscopy (TEM) and X-ray diffractometry (XRD). The results showed that the Pt-Ni particles were uniformly loaded on the carbon nanotubes and the diameter of the Pt-Ni particles was about 2 nm. XRD results show that the composite catalyst is based on Pt lattice-based solid solution structure. Cyclic voltammetry and chronoamperometry were used to test the electrochemical performance of Pt-Ni / MWCNTs modified electrode under alkaline conditions. The results showed that Pt-Ni / MWCNTs could directly catalyze glucose oxidation with a sensitivity of 571.68μA · The detection limit was 0.5 μmol / L (S / N) with a linear range of 1.0 × 10 -5 to 8.2 × 10 -3 mol / L (R = 0.999 4) = 3). In addition, the electrode has good electrocatalytic oxidation performance on glucose, and has good selectivity and reproducibility, and can effectively avoid the interference of ascorbic acid, uric acid and dopamine.