The Parkinson Lab is performing fundemental research on a redox flow battery, which can store both electricity and heat. This project encompases both materials issues and photoelectrochemical issues. Fundemental questions researchers in our lab are try to address are: 1) What are the electron transfer kinetic and mass transport limitations in a solar driven redox flow battery? 2) How does the morphology (single crystal, micro- or nanoporous) of the electrode structure influence such properties? 3) What properties of a redox electrolyte, such as redox potential with respect to the band positions in the semiconductor, concentration and standard electron transfer rate constants, result in the most stored and recoverable electrical energy through a photocharge and discharge cycle?