(153f) High Photon Flux Photoelectrochemical Reactor: Modelling and Operation

Production of hydrogen via sustainable technologies using renewable resources is an important goal for future global energy generation and storage. Photoelectrolysis is an attractive approach in this context, both, for its simplicity and the opportunity of employing relatively cheap materials. Considerable effort has been expended on the development of materials for photoelectrolysis - less so on the development of photoelectrochemical reactors. Here we model and demonstrate the operation of a high photon flux photoelectrochemical reactor and identify some of the key criteria for the rational design of an efficient, practical device. Mathematical models have already been developed to account for fluid flow and current distribution. An additional model rationalises the minority carrier distribution within the photoelectrochemical film itself. Process intensification through solar concentration will be demonstrated with a flat plate device, leading to a 5-fold increase in hydrogen production rate per unit active semiconductor area, or, conversely a significant reduction in device cost.