Electrolysis-reducing electrodes for electrokinetic devices
Electrolysis-reducing electrodes for electrokinetic devices
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DOI：
10.1002/elps.201000617
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发表时间：
2011-03-01
期刊：
影响因子：
2.9
通讯作者：
Robinson, Nathaniel D.
中科院分区：
文献类型：
--
作者：
Erlandsson, Per G.;Robinson, Nathaniel D.
直流电动系统通常需要在一对电极处发生法拉第反应，以在连接它们的电解质中保持电场。绝大多数这样的系统，e。G.电泳分离（毛细管电泳）或电渗泵（EOP）在这些反应中使用溶剂的电解。在许多情况下，电解产物，例如在水的情况下的H+和OH-，可以负面地影响被运输或分离的化学或生物物质，并且气体产物例如O-2和H-2可以破坏微流体装置中的电化学回路。本文提出了一种EOP，它采用共轭聚合物聚（3，4-乙撑二氧噻吩）的氧化/还原，而不是电解的溶剂，以驱动毛细管中的流动。用聚（3，4-亚乙基二氧噻吩）电极制成的装置与用Pt电极制成的装置在电极处的流动和局部pH变化方面进行比较。此外，我们证明，流驱动施加的电位在2 V以下，和电极是稳定的电位至少100 V的电化学活性电极，如这里提出的集成EOP的缺点最小化，e。G.芯片实验室应用，并可能开辟新的可能性，特别是对于电池供电的一次性护理点设备。
Direct current electrokinetic systems generally require Faradaic reactions to occur at a pair of electrodes to maintain an electric field in an electrolyte connecting them. The vast majority of such systems, e. g. electrophoretic separations (capillary electrophoresis) or electroosmotic pumps (EOPs), employ electrolysis of the solvent in these reactions. In many cases, the electrolytic products, such as H+ and OH- in the case of water, can negatively influence the chemical or biological species being transported or separated, and gaseous products such as O-2 and H-2 can break the electrochemical circuit in microfluidic devices. This article presents an EOP that employs the oxidation/reduction of the conjugated polymer poly(3,4-ethylenedioxythiophene), rather than electrolysis of a solvent, to drive flow in a capillary. Devices made with poly(3,4-ethylenedioxythiophene) electrodes are compared with devices made with Pt electrodes in terms of flow and local pH change at the electrodes. Furthermore, we demonstrate that flow is driven for applied potentials under 2 V, and the electrodes are stable for potentials of at least 100 V. Electrochemically active electrodes like those presented here minimize the disadvantage of integrated EOP in, e. g. lab-on-a-chip applications, and may open new possibilities, especially for battery-powered disposable point-of-care devices.