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采用等体积浸渍和程序升温还原的方法制备了不同Ni含量的Ni/AC纳米催化剂,并对其进行了形貌和结构表征。采用三电极体系和循环伏安法在碱性溶液中进行了其对葡萄糖催化氧化的电化学测试。结果表明,Ni/AC/GCE(修饰在玻碳电极上的Ni/AC)催化剂对葡萄糖有较强的电催化氧化作用。其中,20%的Ni/AC/GCE对葡萄糖电催化氧化作用最强,且随着葡萄糖浓度增加,响应电流显著增大,二者呈线性相关。20%Ni/AC/GCE催化剂对葡萄糖催化氧化的线性响应范围为0.2~6.5 mmol/L,相关系数为0.999,响应灵敏度是13.15μA/(mmol/L),最低检测限为35μmol/L。稳定性测试结果表明,20%Ni/AC/GCE有着良好的稳定性,每隔两天测试,运行三周后其响应电流仍能维持在95%以上。
Ni / AC nanocatalysts with different Ni content were prepared by the same volume impregnation and temperature programmed reduction. The morphology and structure of the catalysts were characterized. Electrochemical tests on the catalytic oxidation of glucose were carried out in alkaline solution using a three-electrode system and cyclic voltammetry. The results show that Ni / AC / GCE catalyst (Ni / AC modified on glassy carbon electrode) has a strong electrocatalytic oxidation of glucose. Among them, 20% of Ni / AC / GCE electrocatalytic oxidation of glucose strongest, and with the increase of glucose concentration, the response current increased significantly, the two were linearly related. The linear response range of 20% Ni / AC / GCE catalyst to glucose oxidation was 0.2-6.5 mmol / L, the correlation coefficient was 0.999, the response sensitivity was 13.15 μA / (mmol / L) and the lowest detection limit was 35 μmol / L. Stability test results show that 20% Ni / AC / GCE has good stability, tested every two days, after three weeks of operation the response current can still be maintained at 95% or more.