Coupled Electrochemical Reactions at Bipolar Microelectrodes and Nanoelectrodes
Coupled Electrochemical Reactions at Bipolar Microelectrodes and Nanoelectrodes
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DOI：
10.1021/ac2028672
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发表时间：
2012-02-07
影响因子：
7.4
通讯作者：
Zhang, Bo
中科院分区：
文献类型：
--
作者：
Guerrette, Joshua P.;Oja, Stephen M.;Zhang, Bo
在这里，我们报告了在一个封闭的双极电池的微电极和纳米电极上耦合的电化学反应的伏安法研究。我们使用稳态循环伏安法来讨论封闭双极电极（BPEs）的整体伏安响应，并了解其对氧化还原物种的浓度和电极尺寸的依赖性。以前在双极电分析化学中的许多工作都集中在使用具有位于开放微通道中的BPE的“开放”池。另一方面，封闭的BPE具有放置在单独隔室中的两个极，并且在该领域中相对未被探索。在这项工作中，我们证明了碳纤维微电极，当回填电解质，以建立导电性是封闭的BPE。氧化反应，例如，碳盘/圆柱上的多巴胺氧化和内部纤维上的氧还原可能是导电性的原因。我们还证明了定量测量伏安特性的阴极和阳极极在一个封闭的双极电池从一个单一的循环伏安法（CV）扫描的能力。结果发现，“二次”反应，如氧还原在这一过程中发挥了重要作用。我们还描述了铂双极纳米电极的制造和使用，这可能是一个有用的平台，为未来的纳米双极电化学的进展。
Here we report the voltammetric study of coupled electrochemical reactions on microelectrodes and nanoelectrodes in a closed bipolar cell. We use steady-state cyclic voltammetry to discuss the overall voltammetric response of closed bipolar electrodes (BPEs) and understand its dependence on the concentration of redox species and electrode size. Much of the previous work in bipolar electroanalytical chemistry has focused on the use of an "open" cell with the BPE located in an open microchannel. A closed BPE, on the other hand, has two poles placed in separate compartments and has remained relatively unexplored in this field. In this work, we demonstrated that carbon-fiber microelectrodes when backfilled with an electrolyte to establish conductivity are closed BPEs. The coupling between the oxidation reaction, e.g., dopamine oxidation, on the carbon disk/cylinder and the reduction of oxygen on the interior fiber is likely to be responsible for the conductivity. We also demonstrated the ability to quantitatively measure voltammetric properties of both the cathodic and anodic poles in a closed bipolar cell from a single cyclic voltammetry (CV) scan. It was found that "secondary" reactions such as oxygen reduction play an important role in this process. We also described the fabrication and use of Pt bipolar nanoelectrodes which may serve as a useful platform for future advances in nanoscale bipolar electrochemistry.