In Situ Measurement of Local pH at Working Electrodes in Neutral pH Solutions by the Rotating Ring‐Disk Electrode Technique
In Situ Measurement of Local pH at Working Electrodes in Neutral pH Solutions by the Rotating Ring‐Disk Electrode Technique
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采用旋转环盘电极技术原位测量中性 pH 溶液中工作电极的局部 pH 值
DOI：
10.1002/celc.201900759
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发表时间：
2019
期刊：
影响因子：
4
通讯作者：
Abe Takeshi
中科院分区：
文献类型：
--
作者：
Yokoyama Yuko;Miyazaki Kohei;Miyahara Yuto;Fukutsuka Tomokazu;Abe Takeshi
当发生产生/消耗质子或氢氧根离子的电化学反应时，电极附近的局部pH值与本体pH值有很大的不同。然而，测量局部pH值是非常困难的，使用旋转环盘电极（RRDE）的想法不适用于中性pH的溶液。在这里，我们扩展了使用RRDE测量局部pH值的理论，使其适用于宽pH范围的溶液。在接近中性pH的溶液中对氢氧化/析氢反应的测量证实了这一扩展理论。此外，还测量了高浓度溶液中的局部pH变化，结果表明，无论溶液浓度如何，这种局部pH测量方法都可以使用。
When electrochemical reactions that generate/consume protons or hydroxide ions take place, the local pH in the vicinity of an electrode becomes considerably different from the bulk pH. However, measuring the local pH is very difficult, and the idea of using a rotating ring‐disk electrode (RRDE) is not applicable to solutions with neutral pH. Herein, we extend the theory of local pH measurement using a RRDE and make it applicable to solutions with a wide pH range. This extended theory is corroborated by measurements of hydrogen oxidation/evolution reactions in solutions with near‐neutral pH. In addition, the local pH change in a highly concentrated solution is also measured, and the results show that this local pH measurement method can be used regardless of the solution concentration.