Optical voltammetry of redox processes inside a nanohole with opto-iontronic microscopy

Proceedings of the National Academy of Sciences, Volume 123, Issue 5, February 2026. <br/>SignificanceElectrochemical reactions govern catalysis and sensors. Yet their crucial steps unfold locally on nanometer distances from the electrodes, far below the reach of conventional voltammetry that averages over large areas. We introduce “Opto-…