NOVELTY - A stabilized electroactive system (100) comprises an electroactive device comprising electrochemically active surface, electrochemically active material (106), and polymer coating (104) disposed over the material; and an electrolyte solution (112) contacting at least a portion of polymer coating. The polymer coating is electrically conducting, optically transparent and corrosion resistant. The polymer coating is configured to be an oxidation electrocatalyst material.    USE - As stabilized electroactive system, e.g. photoelectochemical cell, an artificial photosynthetic cell or solar battery (claimed).    ADVANTAGE - The system has fuel conversion efficiency of at least 10%; and remains stable for at least 18 hours of continuous illumination. The polymer used in the functional coating is highly tunable; this allows for functional coating to be used in applications for different electroactive devices under different conditions. The functional coating material protects electroactive devices from chemical/electrochemical/photo corrosion enabling it for long term efficient operation, i.e. the devices can last for at least 10-100 days. The system is large scale, inexpensive, hybrid organic-inorganic solar-to-chemical conversion system.    DETAILED DESCRIPTION - A stabilized electroactive system (100) comprises an electroactive device comprising an electrochemically active surface, electrochemically active material (106), and polymer coating (104) disposed over the electrochemically active material; where the polymer coating is electrically conducting, optically transparent, and corrosion resistant; and an electrolyte solution (112) contacting at least a portion of the polymer coating. The system additionally comprises counter electrode (110), and semipermeable coating on the polymer coating. The electroactive device further comprises reduction electrocatalyst material disposed on opposite side of the electrochemically active layer; and transparent substrate disposed on the polymer coating.    DESCRIPTION OF DRAWING(S) - The figure shows perspective view of stable photoelectochemical system.    Photoelectochemical system (100)    External wire (103)    Functional coating (104)    Electrochemically active material (106)    Counter electrode (110)    Electrolyte solution (112)    Ammeter (114)