Zn2+诱导棱柱状四氧化三钴的制备及在葡萄糖传感器中的应用

以硝酸钴、硝酸锌、尿素、氟化铵为原料,泡沫镍为基体,在水热法的基础上,利用两性金属的特点,通过引入Zn²⁺离子,并结合碱洗过程,在泡沫镍基体表面合成了高纯度独特的棱柱状Co₃O₄纳米团簇纤维。制备的Co₃O₄/Ni电极的形貌及成分通过扫描电子显微镜与X射线衍射进行了表征,电极的电化学性能利用循环伏安法与计时电流法测试,测试均在1mol/L KOH溶液中进行。结果表明:利用Zn²⁺诱导在泡沫镍表面制备的Co₃O₄呈现一种棱柱状纳米团簇纤维结构。这种结构的Co₃O₄纳米材料具有高的比表面积,在对葡萄糖检测过程中表现出优越的电化学性能,当其作为电极,表现出检测灵敏度高23430μA/(mmol/L·cm²)],检出限低(1.547μmol/L)和线性检测范围宽(0~2.75mmol/L)的特点。抗干扰实验在+0.5Vvs.SCE进行,结果显示制备的Co₃O₄/Ni电极对葡萄糖具有优异的选择性。因此可应用于无酶葡萄糖传感器的电极材料来改善现有无酶葡萄糖传感器材料响应范围小,灵敏度低等问题。

Preparation of Zn2+induced prismatic Co3O4and its application in glucose sensor

Co₃O₄with high-purity and unique prismatic structure were synthesized on the surface of the nickel foam based on hydrothermal method with combination of alkali washing.Which used cobalt nitrate,zinc nitrate,urea and ammonium fluoride as raw materials,and nickel foam as matrix,meanwhile amphoteric Zn²⁺ions were added.The composition and morphology of the Co₃O₄/Ni electrode was characterized by X-ray diffraction(XRD)and scanning electron microscope(SEM),and the electrochemical properties of the fabricated Co₃O₄/Ni heterostructure-based glucose sensor were detected in 1 M KOH solution by the cyclic voltammetry(CV)and chronoamperometry methods.The results showed that synthesized Co₃O₄on the surface of nickel foam had prismatic nano-cluster fibrous structure.This nano-cluster Co₃O₄based electrode had a high specific surface area,and showed excellent electrochemical performance in the process of glucose detection.As an electrode,the Co₃O₄/Ni heterostructure showed high detection sensitivity23430μA/(mmol/L·cm²)],low detection limit(1.547μmol/L)and wide linear detection range(0~2.75 mmol/L).Anti-interference tests showed that the prepared electrode had good selectivity to glucose at+0.5 Vvs.SCE.Therefore this Co₃O₄/Ni based electrode can be used as electrode material of non-enzyme glucose sensor,and solved the problem of low sensitivity and small response range existing in non-enzyme glucose sensor materials.