Figure 10.

(A) General principles of optical microscopy imaging of electrochemical processes, with schematic setup and some selected types of detection based on the phenomenon at the origin of the imaging process. (B) Single-photon ECL imaging of Ru(bpy)₃²⁺ oxidation at an Au hexagonal nanoplate: SEM micrograph with corresponding kinetic and thermodynamic mappings of Ru(bpy)₃²⁺ oxidation. Reproduced from Operando Imaging of Chemical Activity on Gold Plates with Single-Molecule Electrochemiluminescence Microscopy, Dong, J.; Xu, Y.; Zhang, Z.; Feng, J. Angew. Chem. Int. Ed., Vol. 61, Issue 14 (ref (347)). Copyright 2022 Wiley. (C) Implementing optical phase imaging in scattering interferometric microscopy to track the electrochemical conversion of Ag into AgCl NPs and vice versa. Reproduced from Wu, G.; Zhou, X.; Lv, W. L.; Qian, C.; Liu, X. W. Real-Time Plasmonic Imaging of the Compositional Evolution of Single Nanoparticles in Electrochemical Reactions. Nano Lett.2022, 22 (11), 4383–4391 (ref (359)). Copyright 2022 American Chemical Society. (D) Monitoring object dissolution. DFM setup used to probe single coccolitophore calcification degree by dissolution using electrogenerated H⁺. Reproduced from Opto-Electrochemical Dissolution Reveals Coccolith Calcium Carbonate Content, Yang, M.; Batchelor-McAuley, C.; Barton, S.; Rickaby, R. E. M.; Bouman, H. A.; Compton, R. G. Angew. Chem. Int. Ed.2021, Vol. 60, Issue 38 (ref (404)) under CC-BY 4.0 license. (E) Monitoring gas evolution reactions. Schematic and DFM images, at different potential values, of IrO₂ NPs hopping, induced by oxygen nanobubbles formation at the interface between NPs and electrode. Reproduced from Wang, J. G.; Zhang, L.; Xie, J.; Weizmann, Y.; Li, D.; Li, J. Single Particle Hopping as an Indicator for Evaluating Electrocatalysts. Nano Lett.2022, 22 (13), 5495–5502 (ref (407)). Copyright 2022 American Chemical Society.