原位生长α-Co(OH)2纳米片修饰电极快速检测亚硝酸盐  

Rapid determination of nitrite by in-situ growthα-Co(OH)2 nanosheets modified electrode

作　　者：刘占 LIU Zhan(Guang Dong Mei Wei Xian Flavoring Foods Co.,Ltd.,Zhongshan 528400,China)

机构地区：[1]广东美味鲜调味食品有限公司,广东中山528400

出　　处：《现代食品科技》2020年第9期309-313,236,共6页Modern Food Science and Technology

摘　　要：本工作以硝酸钴为前驱体,通过一步电沉积法在玻碳电极表面原位生长氢氧化钴纳米片,构建了电化学传感器,研究了其对NO2-离子的电催化行为,建立了快速测定NO2^-离子的电化学方法。通过扫描电子显微镜(Scanning electron microscope,SEM)、能量散射光谱(Elemental energy spectrum analysis,EDX)和电化学技术对所获得的纳米材料的形貌和性能进行表征,进一步研究该修饰电极快速检测NO2^-离子的电化学行为和电催化机理。结果表明,同一浓度NO2^-离子在不同扫描速度与电流响应间成正比关系,得到Co(OH)2/GCE界面的电化学过程受吸附控制。Co(OH)2/GCE对NO2-离子展现了良好的电催化性能,检测线性范围为1~15 mmol/L,检测限为0.29 mmol/L(S/N=3)。该传感器具有快速制备、催化活性好、易操作以及检测耗时短等特点,适用于亚硝酸盐的现场快速筛查。In this work,cobalt hydroxide nanocrystal sheet was prepared by one-step electrodeposition with cobalt nitrate as a precursor.The electrocatalytic behavior to NO2^-ion of cobalt hydroxide was studied and the electrochemical sensor was constructed.The morphology and properties of Co(OH)2/GCE were characterized by scanning electron microscopy(SEM),elemental energy spectrum analysis(EDX)and electrochemical techniques,and the electrochemical behavior and electrocatalytic mechanism of NO2-ion were rapidly detected by the modified electrode.The results show that the same concentration of NO2^-ion has a proportional relationship between different scanning rates and current,and the electrochemical process of the Co(OH)2/GCE interface is controlled by adsorption.Co(OH)2/GCE showed a good electro-catalytic performance for NO2^-ions,with a linear range of 1~15 mmol/L and a detection limit of 0.29 mmol/L(S/N=3).The sensor exhibited rapid preparation,good catalytic activity and easy operation,which is suitable for rapid field screening of nitrite.

关 键 词：氢氧化钴 电化学 亚硝酸盐 

分 类 号：O657.1[理学—分析化学] TP212[理学—化学] TS202.3[自动化与计算机技术—检测技术与自动化装置]