NOVELTY - An electrode is partially coated with metal nanoparticles by light induced effect.    USE - Electrode used in photocatalytic reactor, light-assisted fuel cell, solar light assisted fuel cell, light assisted electrolysis cell and solar light assisted electrolysis cell for vehicle, satellite, aircraft, marine vessel, transportation structure, engine, fork lift, hydrogen fuelling station, building, domestic building, hydrogen storage structure and for solar, wind, nuclear, hydro power generation applications (all claimed). Can also be used in off-grid power supply, emergency power system, generator, residential home, hospital, scientific laboratory, data center, telecommunication equipment, modern naval ship, electric and hybrid vehicles, notebook computer, cell phone personal digital assistant (PDA), smartphone and small heating appliance, etc.    ADVANTAGE - The efficiency of the electrolysis process can be improved and the energy consumption can be reduced reliably while improving the electrical efficiency and improving the operability.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) photocatalytic reactor;    (2) light-illuminated nanoparticle;    (3) solar light-illuminated nanoparticle;    (4) light-assisted fuel cell;    (5) solar light assisted fuel cell;    (6) light assisted electrolysis cell;    (7) solar light assisted electrolysis cell;    (8) fuel cell stack;    (9) article of manufacture;    (10) method for producing partially coated electrode;    (11) method for producing light induced electrode;    (12) method for producing photocatalytic reactor;    (13) method for producing fuel cell;    (14) method for producing electrolysis cell;    (15) method for performing photocatalysis in electrolytic cell;    (16) method for performing photocatalysis in fuel cell; and    (17) method of manufacturing fuel cell stack.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the photocatalytic electrode assembly.    Anode (121)    Separator (122)    Proton exchange membrane (123)    Cathode (124)    Extraneous radiation (140)