Photoelectrochemical Water Splitting of Metal Oxide Photoanode Enhanced with a Cerium(III/IV) Redox Mediator

Wednesday, 4 October 2017
Prince George's Exhibit Hall D/E (Gaylord National Resort and Convention Center)


Photoelectrochemical (PEC) water-splitting remains a promising sustainable technique for hydrogen generation. However, existing photoanode materials for PEC water-splitting suffer from sluggish water oxidation kinetics. Cerium (IV) compounds have historically been used as oxidizers in chemical and are thermodynamically able to oxidize water without additional energy input. In this project, Cerium(III/IV) is used as a regenerable redox mediator for water oxidation. A rutile TiO2 nanorod array (TiO2 NRA) is employed as a photoanode in an acidic electrolyte containing varying concentrations of Ce(III). This presentation demonstrates the roles of Ce(III) in improving the photoelectrochemical performance of TiO2 NRA.