Ketkaew Marisa, Kassahun Getnet, Ali Nashwan Hussein, Garrigue Patrick, Bonhommeau Sébastien, Bouffier Laurent, Kuhn Alexander, Wattanakit Chularat, Zigah Dodzi
Department of Chemical and Biomolecular Engineering, School of Energy Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Rayong, 21210, Thailand.
ISM UMR 5255, University of Bordeaux, Bordeaux INP, CNRS, 33607, Pessac, France.
Mikrochim Acta. 2025 Mar 28;192(4):270. doi: 10.1007/s00604-025-07109-w.
Glassy carbon electrodes were modified with a CeO film and Pt nanoparticles (Pt-CeO) for electrocatalysis. Interestingly, the oxidation of benzyl alcohol was significantly enhanced when Pt-CeO films were prepared by the simultaneous electrodeposition of the two materials, indicating a significant synergistic electrocatalytic activity. Subsequently, bipolar electrochemistry was employed to prepare Pt-CeO gradient films. Scanning electrochemical microscopy (SECM) was employed for studying local electrochemical properties at liquid/solid interfaces. SECM allowed mapping the local electrochemical performance of the Pt-CeO gradient films for benzyl alcohol oxidation, showing that the reaction rate is proportional to the local Pt-CeO surface coverage. Therefore, Pt-CeO deposits with different densities along the bipolar electrode offer tunable catalytic performances for benzyl alcohol oxidation. This allows identifying in a fast and straightforward way the optimal conditions for electrocatalytic processes in a more general sense because the approach, illustrated here with one specific reaction, can be easily generalized to other catalytically active surfaces.
玻碳电极用CeO薄膜和铂纳米颗粒（Pt-CeO）进行修饰以用于电催化。有趣的是，当通过两种材料的同时电沉积制备Pt-CeO薄膜时，苯甲醇的氧化显著增强，这表明存在显著的协同电催化活性。随后，采用双极电化学法制备Pt-CeO梯度薄膜。利用扫描电化学显微镜（SECM）研究液/固界面处的局部电化学性质。SECM能够绘制出Pt-CeO梯度薄膜对苯甲醇氧化的局部电化学性能，结果表明反应速率与局部Pt-CeO表面覆盖率成正比。因此，沿双极电极具有不同密度的Pt-CeO沉积物为苯甲醇氧化提供了可调节的催化性能。这使得能够以快速且直接的方式确定更一般意义上电催化过程的最佳条件，因为这里用一个特定反应说明的方法可以很容易地推广到其他催化活性表面。
