2 research outputs found
Photoelectrochemical Water Oxidation Using Cobalt PhosphateâModified NitrogenâDoped Titania Nanotube Arrays
The synthesis of cobalt phosphate (CoPi)âmodified, nitrogenâdoped TiO2 nanotube arrays (NâTNAs) for photoelectrochemical (PEC) oxygen evolution under visible light is reported. Because of the nitrogen doping, the NâTNAs exhibit enhanced visibleâlight activity toward the PEC water oxidation reaction. However, the performance is diminished as a result of selfâoxidation by photogenerated holes in the valence band of the NâTNAs. Compared with the NâTNAs, the CoPi/NâTNAs prepared under optimal conditions show a twofold improvement in photocurrent generation and are also sensitive to light with wavelengths as long as 580ânm. Stable oxygen evolution with a Faradaic efficiency approaching unity is demonstrated using the CoPi/NâTNA photoanodes under simulated sunlight for at least 2âh of operation