Exploring the electrochemical performance of graphitic paste electrodes: graphene vs. graphite
Exploring the electrochemical performance of graphitic paste electrodes: graphene vs. graphite
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DOI：
10.1039/c3an00950e
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发表时间：
2013-01-01
期刊：
影响因子：
4.2
通讯作者：
Banks, Craig E.
中科院分区：
文献类型：
--
作者：
Figueiredo-Filho, Luiz C. S.;Brownson, Dale A. C.;Banks, Craig E.
我们报告的制造，表征（SEM，TEM，XPS和拉曼光谱）和电化学实施的石墨烯糊电极。所使用的糊剂电极通过简单地将石墨烯与矿物油（其充当粘合剂）混合来构造，然后将所得糊剂装载到活塞驱动的聚合物管电极壳中，其中该电极配置允许电极表面的快速更新。制造的糊电极的电化学特征在于使用两个内球和外球氧化还原探针，即亚铁氰化钾（II），hexammineruthenium（III）氯化物和hexachloroiridate（III），除了生物相关的和电活性的分析物，L-抗坏血酸（AA）和尿酸（UA）。与石墨膏替代品和石墨烯实施的好处作为一个糊状电极内电化学进行了比较，以及其电分析性能的表征。我们发现在电化学性能上没有可观察到的差异，因此表明在制造糊状电极中使用石墨烯比石墨没有优势。这样的工作是非常重要的和信息的那些在电分析领域的工作，其中电化学可以提供便携式，快速，可靠和准确的传感协议（将实验室带入现场），特别是对那些寻找新的电极材料。
We report the fabrication, characterisation (SEM, TEM, XPS and Raman spectroscopy) and electrochemical implementation of a graphene paste electrode. The paste electrodes utilised are constructed by simply mixing graphene with mineral oil (which acts as a binder) prior to loading the resultant paste into a piston-driven polymeric-tubing electrode-shell, where this electrode configuration allows for rapid renewal of the electrode surface. The fabricated paste electrode is electrochemically characterised using both inner-sphere and outer-sphere redox probes, namely potassium ferrocyanide(II), hexaammineruthenium(III) chloride and hexachloroiridate(III), in addition to the biologically relevant and electroactive analytes, L-ascorbic acid (AA) and uric acid (UA). Comparisons are made with a graphite paste alternative and the benefits of graphene implementation as a paste electrode within electrochemistry are explored, as well as the characterisation of their electroanalytical performances. We reveal no observable differences in the electrochemical performance and thus suggest that there are no advantages of using graphene over graphite in the fabrication of paste electrodes. Such work is highly important and informative for those working in the field of electroanalysis where electrochemistry can provide portable, rapid, reliable and accurate sensing protocols (bringing the laboratory into the field), with particular relevance to those searching for new electrode materials.