Fabrication of platinum-disk ultramicroelectrodes.

Fabrication of platinum-disk ultramicroelectrodes.
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铂盘超微电极的制造。

DOI:
10.1021/ac00153a021
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发表时间:
1988
影响因子:
7.4
通讯作者:
Sweigart,DA
Sweigart,DA
中科院分区:
化学1区
文献类型:
--
作者:
Baer,CD;Stone,NJ;Sweigart,DA

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在过去的几年里,铂、金和石墨超微电极(至少有一个维度小于25)已经得到了广泛的研究。这样的电极已经被制造成盘、圆柱体、环和各种阵列。与直径为1mm的常规电极相比,微电极在伏安实验中具有几个显著的优点。这些特性包括:(1)在适当低的扫描速率下的稳态响应,(2)通过稳态测量确定中等快的非均相电子转移速率常数(ks)以及非常快的均相化学反应的速率常数的能力,(3)减少了由iR下降引起的失真,这允许使用极性较小的溶剂、较低的电解质浓度和较快的扫描速率,(4)法拉第电流的快速测量
Platinum, gold, and graphite ultramicroelectrodes having at least one dimension less than 25 have been intensely investigated during the past fewyears. Such electrodes have been fabricated as disks, cylinders, rings, and various arrays. Compared to conventional electrodes of diameter on the order of 1 mm, microelectrodesoffer several significant advantages in voltammetric experiments. These include (1) a steady-state response at appropriately low sweep rates,(2) the ability to determine moderately fast heterogeneous electron-transfer rate constants (ks) as well as rate constants for very rapid homogeneous chemical reactions through steady-state measure-ments,(3) decreased distortion from iR drop, which allows less polar solvents, lower electrolyte concentrations, and faster sweep rates to be used,(4) rapid measurement of faradaic
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