High-performance carbon composite electrode based on an ionic liquid as a binder
High-performance carbon composite electrode based on an ionic liquid as a binder
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DOI：
10.1021/ac060070
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发表时间：
2006-06-01
影响因子：
7.4
通讯作者：
Tajabadi, Fariba
中科院分区：
文献类型：
--
作者：
Maleki, Norouz;Safavi, Afsaneh;Tajabadi, Fariba
采用离子液体六氟磷酸正辛基吡啶（OPFP）制备了一种具有良好电化学性能的新型碳复合电极。这种类型的碳电极是用石墨与OPFP混合作为粘合剂构建的。该电极结合了碳纳米管的边平面特性和边平面热解石墨电极的优点，以及碳糊电极的低成本和金属电极的坚固性。它显著提高了不同有机和无机电活性化合物的电子转移速率，并显著降低了NADH、多巴胺和抗坏血酸等生物分子的过电压。它还规避了NADH表面污垢效应，并为广泛的化合物测试提供了更高的电流密度。根据电解液的选择，电极可以具有粘土修饰电极的离子交换性能和吸附特性。因此，所提出的电极允许对生物分子和其他电活性化合物进行敏感、低电位、简单、低成本和稳定的电化学传感。扫描电子显微镜图像表明，与碳糊电极相比，所提出的电极的微观结构有显著改善。这种能力为广泛的电化学和生物传感应用提供了新的机会。
Ionic liquid, n-octylpyridinum hexafluorophosphate (OPFP) has been used to fabricate a new carbon composite electrode with very attractive electrochemical behavior. This type of carbon electrode has been constructed using graphite mixed with OPFP as the binder. The electrode has combined advantages of edge plane characteristics of carbon nanotubes and edge plane pyrolytic graphite electrodes together with the low cost of carbon paste electrodes and robustness of metallic electrodes. It provides a remarkable increase in the rate of electron transfer of different organic and inorganic electroactive compounds and offers a marked decrease in the over-voltage for biomolecules such as NADH, dopamine, and ascorbic acid. It also circumvents NADH surface fouling effects as well as furnishing higher current density for a wide range of compounds tested. Depending on the choice of the electrolyte, the electrode can have the ion-exchange property and adsorptive characteristics of clay-modified electrodes. The proposed electrode thus allows sensitive, low-potential, simple, low-cost, and stable electrochemical sensing of biomolecules and other electroactive compounds. Scanning electron microscopy images indicate significant improvement in the microstructure of the proposed electrode compared to carbon paste electrodes. Such abilities promote new opportunities for a wide range of electrochemical and biosensing applications.