Patent attributes
An electrochemical device comprises a fluidic cell having an internal volume able to be filled with a fluid and at least one first and one second electrode making contact with the internal volume, wherein at least the first electrode comprises a thin layer made of a conductive material that is optically absorbent at at least one wavelength λ in the visible, near-infrared or near-ultraviolet spectrum, the thin layer being arranged on or in an internal surface of a wall of the fluidic cell which is at least partially transparent to said wavelength λ. An electrochemical apparatus comprises such an electrochemical device and an optical microscope arranged to illuminate the first electrode through the wall at at least said wavelength λ and also to observe it through the wall.