基于石墨烯气凝胶的全固态硝酸根离子选择性电极研究

发布时间：2018-03-21 20:11

本文选题：全固态离子选择性电极　切入点：石墨烯气凝胶　出处：《农业机械学报》2017年05期 　论文类型：期刊论文

【摘要】：全固态离子选择性电极的结构在许多制备和应用方面具有明显优势。但由于固态界面上缺少有效的离子-电子转化导致其在电位稳定性上表现较差,无法保证各界面电势的稳定性而限制了全固态离子选择性电极的应用。因此,提出使用具有三维结构的石墨烯气凝胶(GAs)作为有效的固态转接层材料,用于调节离子载体基选择性聚合膜玻碳电极基底之间的离子-电子转化,基于这一原理制备了高性能全固态硝酸根离子选择性电极。通过透射电子显微镜表征其形貌特征;将其滴涂于玻碳电极表面形成GAs修饰电极,采用循环伏安法表征其电化学行为。在上述修饰电极表面覆上硝酸根离子选择性膜后制备新型的全固态离子选择性电极,通过电位水层测试、电位测量来表征其性能。GAs转接层的离子选择性电极对硝酸根离子展现出良好的能斯特响应和10~(-4.2)mol/L的检测下限,这为实现硝酸根离子现场即时检测提供了可能。
[Abstract]:The structure of all-solid-state ion-selective electrode has obvious advantages in many aspects of preparation and application, but its potential stability is poor due to the lack of effective ion-electron transition at the solid-state interface. The stability of interface potential can not be guaranteed and the application of all-solid-state ion-selective electrode is limited. Therefore, the use of graphene aerogel with three-dimensional structure as an effective solid-state transition layer material is proposed. The high performance solid nitrate ion selective electrode was prepared based on the principle of regulating the ion-electron transition between the substrate of the glassy carbon electrode. The morphology of the electrode was characterized by transmission electron microscopy (TEM). The GAs modified electrode was coated on the surface of glassy carbon electrode and its electrochemical behavior was characterized by cyclic voltammetry. A novel all solid state ion selective electrode was prepared by coating nitrate ion selective membrane on the surface of the modified electrode. Through the potentiometric water layer test, the potential measurement was used to characterize its performance. The ion selective electrode of gas layer showed good Nernst response to nitrate ion and the detection limit of 10~(-4.2)mol/L, which provided the possibility for the real-time detection of nitrate ion in situ.
【作者单位】：江苏大学农业装备工程学院;
【基金】：国家自然科学基金项目(31101082、61075036) “十二五”国家科技支撑计划项目(2014BAD08B03) 江苏高校优势学科建设工程PAPD项目(苏政办发(2011)6号) 农业部农业信息技术重点实验室开放课题项目
【分类号】：O657.15;S132

【相似文献】