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O: Fachverband Oberflächenphysik

O 84: Poster Session - Solid-Liquid Interfaces: Reactions and Electrochemisty

O 84.5: Poster

Mittwoch, 18. März 2020, 18:15–20:00, P2/EG

Characterization of Microelectrodes for Scanning Electrochemical Microscopy — •Leon Rosenbecker, Raffael Ruess, and Derck Schlettwein — Justus Liebig University Gießen, Institute of Applied Physics

Scanning electrochemical microscopy (SECM) can be used to investigate the dye regeneration process of dye-sensitized solar cells (DSSCs).[1] In the present work, we studied the performance and stability of different catalytic layers for the microelectrodes. The electrodes have been structured using photolithography on a polyethylene terephthalate (PET) substrate coated with indium tin oxide (ITO). However, as shown by cyclic voltammetry (CV), ITO does not provide sufficiently fast electrode kinetics. Therefore, PEDOT and gold have been coated onto the ITO microelectrodes. Sputtered gold has proven to be a suitable layer since it has shown high catalytic activity and high stability. Gold coated microelectrodes have then been used for SECM measurements in feedback mode using an actuator to press the microelectrodes against an insulator. A decrease in steady state current has been measured. However, the measured decrease is lower than expected. This is due to an imprecise landing of the microelectrode on the substrate. Presently, we are working on a more precise arrangement and progress will be discussed.

[1]. R. Ruess, S. Scarabino, A. Ringleb, K. Nonomura, N. Vlachopoulos, A. Hagfeldt, G. Wittstock, D. Schlettwein, Phys. Chem. Chem. Phys., 2019, 21, 13047-13057.