An optoelectronic electrode element includes an electrode module (40) having at least a first and second electrodes (41, 42) each having an electrode surface (41s, 42s). An an optoelectronic module (20) is provided and having a photovoltaic cell (21a) suitable for transforming optical energy into electrical energy. A feeding fibre optic (31a) is also provided. A coupling module (10) is provided and having a circuit receiving portion (12) for inserting, positioning, and rigidly fixing the optoelectronic module (20) to the coupling module (10); and a feeding fibre cavity (11a) for inserting and coupling the feeding fibre optic to bring it in optimal optical communication with the photovoltaic cell. The coupling module (10) is coupled directly to a fixing area of the electrode module (40), such that the photovoltaic cell be in electrical contact with the first and second electrodes (41, 42).