Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, Universitätsstr. 31, 93053 Regensburg, Germany.
Future Energy and Innovations Laboratory, CEITEC-Central European Institute of Technology, Brno University of Technology, Purkyňova 123, 612 00 Brno, Czech Republic.
Molecules. 2020 Mar 5;25(5):1169. doi: 10.3390/molecules25051169.
We report a new configuration for enhancing the performance of scanning electrochemical microscopy (SECM) via heating of the substrate electrode. A flattened Pt microwire was employed as the substrate electrode. The substrate was heated by an alternating current (AC), resulting in an increased mass transfer between the wire surface and the bulk solution. The electrochemical response of the Pt wire during heating was investigated by means of cyclic voltammetry (CV). The open circuit potential (OCP) of the wire was recorded over time, while varied heating currents were applied to investigate the time needed for establishing steady-state conditions. Diffusion layer studies were carried out by performing probe approach curves (PACs) for various measuring modes of SECM. Finally, imaging studies of a heated substrate electrode surface, applying feedback, substrate generation/tip collection (SG/TC), and the competition mode of SECM, were performed and compared with room temperature results.
我们报告了一种新的配置，通过加热基底电极来增强扫描电化学显微镜（SECM）的性能。采用扁平的 Pt 微米线作为基底电极。基底通过交流电（AC）加热，导致线表面和本体溶液之间的传质增加。通过循环伏安法（CV）研究了加热过程中 Pt 线的电化学响应。记录了线的开路电位（OCP）随时间的变化，同时施加不同的加热电流以研究达到稳定状态所需的时间。通过执行各种 SECM 测量模式的探针接近曲线（PAC）进行扩散层研究。最后，进行了加热基底电极表面的成像研究，应用反馈、基底产生/尖端收集（SG/TC）和 SECM 的竞争模式，并将结果与室温结果进行了比较。
