Hydrogen generation under sunlight by self ordered TiO2 nanotube arrays

Photo-active and dynamical properties of hematite (Fe2O3)–water interfaces: an experimental and theoretical study

“…3a), indicating that the water-splitting process starts in the presence of light. A small amount of voltage required to initiate water-splitting in the presence of light, could be obtained from a stand-alone solar device if the photo-electrochemical cell is constructed in a tandem configuration by adding a low-cost photovoltaic cell such as a dye-sensitised solar cell [50]. The production of oxygen and hydrogen from the respective hematite and Pt electrode-water interfaces were confirmed by gas chromatography (GC).…”

Dye-sensitized photoelectrochemical cell on plasmonic Ag/AgCl @ chiral TiO 2 nanofibers for treatment of urban wastewater effluents, with simultaneous production of hydrogen and electricity

“…19 The utilization of freely available solar energy as the only energy input makes 20 photocatalysis a sustainable and green process. However, one of the most important 21 advancement in wastewater treatment should be the development of a new process that 1 can simultaneously capture the chemical energy of the oxidized contaminants while 2 meeting the effluent quality standards [1].…”

“…In a 16 DSSC, the sensitizer, which is usually a dye, absorbs the incident photons resulting in 17 the excitation of electrons from the highest occupied molecular orbital (HOMO) to the 18 lowest unoccupied molecular orbital (LUMO) of the dye. The excited electrons are then 19 injected to the conduction band (CB) of the photoanode material (usually TiO 2 ), they 20 further transfer to the photoanode fluorine-doped tin oxide (FTO) supporting the TiO 2 …”

“…They then transfer to the HOMO of the redox couples (usually 1 I -/I 3 -), and finally back to the HOMO of the dye [20,21] to close the cycle. In this 2 process, the redox couples play a very important role as electrons bridges for the 3 stabilization of charges in the DSSCs.…”

“…J sc is determined by electron injection [20,35] which depends on the concentration of 10 contaminants, hence, J sc decreased eventually to a relatively low level as the 11 contaminants were totally removed, after 80 min. However, J sc did not decrease to 0…”