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Mapping the Distribution of Potential Gradient in Bipolar Electrochemical Systems through Luminol Electrochemiluminescence Imaging
Analytical Chemistry ( IF 6.7 ) Pub Date : 2021-06-03 , DOI: 10.1021/acs.analchem.0c05397
Elena Villani 1 , Shinsuke Inagi 1, 2
Affiliation  

Bipolar electrochemistry has been regarded as a powerful and sustainable electrochemical process for the synthesis of novel functional materials. The appealing features of this electrochemical technology, such as the wireless nature of the bipolar electrode (BPE) and the possibility to drive simultaneously electrochemical reactions on multiple BPEs placed in the same electrochemical cell, together with the possibility to change the shape and positioning of the driving electrodes, give significant freedom to design reaction systems. Nevertheless, the cell geometry dramatically affects the distribution and intensity of the potential gradient generated on the BPE surface and its monitoring is hampered due to the wireless nature of the BPE. In the present study, we propose the use of electrochemiluminescence (ECL) as an electrochemical imaging technique to map the distribution of potential gradient in bipolar electrochemical cells with different geometries. The proposed approach exploits the strong ECL emission of luminol/hydrogen peroxide (H2O2) system generated at the anodic pole of the BPE, when the total applied voltage (Etot) is strong enough to trigger the electrochemical reaction. Since luminol ECL emission is rather intense and relatively stable, the evolution of the potential distribution as a function of Etot can be monitored using a digital camera, allowing the elucidation of the potential distribution profile in every bipolar configuration. The suggested approach represents a valuable and reliable method to map the potential gradient in bipolar electrochemical systems and can be readily employed in every type of bipolar configuration.

中文翻译:

通过鲁米诺电化学发光成像绘制双极电化学系统中电位梯度的分布

双极电化学已被认为是合成新型功能材料的强大且可持续的电化学过程。这种电化学技术的吸引人的特点,例如双极电极 (BPE) 的无线特性和在放置在同一电化学电池中的多个 BPE 上同时驱动电化学反应的可能性,以及改变形状和定位的可能性驱动电极,给予设计反应系统很大的自由。然而,小区几何形状极大地影响了 BPE 表面上产生的电位梯度的分布和强度,并且由于 BPE 的无线特性,其监测受到阻碍。在目前的研究中,我们建议使用电化学发光 (ECL) 作为一种电化学成像技术来绘制具有不同几何形状的双极电化学电池中的电位梯度分布。所提出的方法利用鲁米诺/过氧化氢(H2 O 2 ) 系统在 BPE 的阳极产生,当总施加电压 ( E tot ) 足够强以触发电化学反应时。由于鲁米诺 ECL 发射相当强烈且相对稳定,因此可以使用数码相机监测作为E tot函数的电位分布的演变,从而可以阐明每个双极配置中的电位分布轮廓。建议的方法代表了一种有价值且可靠的方法来绘制双极电化学系统中的电位梯度,并且可以很容易地用于每种类型的双极配置。
更新日期:2021-06-15
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