NOVELTY - The photoelectrolytic cell has a container for holding liquid, a photoelectrode, a counterelectrode, and a septum. The photoelectrode is disposed within the container and generates a first gas upon exposure to radiation. The counterelectrode is disposed within the container, while electrically connected to the photoelectrode and generates a second gas when the photoelectrode is exposed to radiation. The septum is arranged between the photoelectrode and the counterelectrode to separate the first and second gases.    USE - Photoelectrolytic cell. Uses include but are not limited to photoelectrolysis for use in a hydrogen-based internal combustion engine, water desalination, continual tuning of stress and bandgap properties for telecomm devices, and alteration and improving magnetic properties of thin films applied to hard drive disks for data storage.    ADVANTAGE - Illumination is concentrated by the stress-inducing template shape by self-focusing, and the concentration of the illumination is largely independent of incident illumination angle, thus reducing or eliminating the need to track the sun in the sky. Corrugated substrate causes the film to be more robust by providing mechanical locking to prevent cracking, crazing, and delamination common to other coating of plastic, and allows the film to exist in a highly stressed state. Radiation concentration of sun is enabled without the need for precise optics, thus allowing a low cost, robust, and light weight apparatus. Product is overcoated with silicon dioxide and titanium dioxide for improved ultra-violet reflection, which provides self-cleaning properties and ruggedness, since the hydrophilic nature of titanium dioxide causes rain to remove accumulated dirt from the surface, thus reducing maintenance and improving lifetime.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for an apparatus for generating electricity and for carrying out photo-induced reactions.    DESCRIPTION OF DRAWING(S) - The drawing shows the perspective view of a multiple core photolysis apparatus.    Cylindrical tower apparatus (1000)    Elongate parallel core assemblies (1016)    Outer cylinder (1018)    Tubes (1020)    Protective manifold (1024)