Brady Áine, Forster Robert J
National Centre for Sensor Research, School of Chemical Sciences, Dublin City University, Dublin 9 D09 V209, Ireland.
FutureNeuro, SFI Research Centre for Chronic and Rare Neurological Diseases, Dublin City University, Dublin 9 D09 V209, Ireland.
Anal Chem. 2025 Jan 14;97(1):410-418. doi: 10.1021/acs.analchem.4c04454. Epub 2024 Dec 19.
Wirefree, or bipolar electrochemistry, is advancing key fields, including (nano)materials, human health, and energy. Central to these applications is an understanding of the potential distribution induced in the bipolar electrode, BPE. Here, the impact of the electric field distribution is reported for the wirefree deposition of the conducting polymer, poly(3,4-ethylenedioxythiophene), PEDOT, in the absence of deliberately added electrolytes. PEDOT films with a gradient thickness are deposited, and the films formed at 10 V cm for 20 min have an average film thickness of 350 nm. Significantly, the quantity of the polymer deposited increases proportionally to the deposition time up to approximately 20 min, suggesting that the presence of a thin PEDOT film does not change the interfacial potential distribution or driving force for heterogeneous electron transfer. For electric field strengths ≥5 V cm, PEDOT is deposited on regions of the BPE where the voltage is predicted to be insufficient to drive electropolymerization. This result demonstrates that local intensification of the field, e.g., at edges, and migration of the cationic radicals can significantly affect the electrodeposition profile. These results provide an enhanced understanding of the potential profiles for applications from multianalyte detection devices to wirefree electroceuticals.
无线电化学，即双极电化学，正在推动包括（纳米）材料、人类健康和能源在内的关键领域的发展。这些应用的核心是理解双极电极（BPE）中感应的电位分布。在此，报道了在没有故意添加电解质的情况下，电场分布对导电聚合物聚（3,4-乙撑二氧噻吩）（PEDOT）的无线沉积的影响。沉积了具有梯度厚度的PEDOT薄膜，在10 V/cm下沉积20分钟形成的薄膜平均厚度为350 nm。值得注意的是，聚合物沉积量与沉积时间成正比增加，直至约20分钟，这表明薄PEDOT薄膜的存在不会改变界面电位分布或异质电子转移的驱动力。对于电场强度≥5 V/cm，PEDOT沉积在BPE上预计电压不足以驱动电聚合的区域。这一结果表明，例如在边缘处的电场局部增强以及阳离子自由基的迁移会显著影响电沉积轮廓。这些结果有助于更深入地理解从多分析物检测设备到无线电疗药物等应用的电位分布情况。
