Industrial & Engineering Chemistry Research | 2019
Photochemical Thermodynamic Efficiency Factors (PTEFs) for Hydrogen Production Using Different TiO2 Photocatalysts
The present study reports photochemical thermodynamic efficiency factors (PTEFs) for hydrogen production. The PTEF parameter equates the enthalpy of formation of consumed OH• and H• free radicals with their absorbed photon energy. In this case, therefore, the PTEFs provide information on the efficiency of photon energy utilization. Data from different Pt- and Pd-doped photocatalysts used for hydrogen production, obtained in a Photo-CREC Water-II Reactor under near-UV and visible irradiations, were considered. The evaluated photocatalysts were characterized using XRD, BET, chemisorption and diffuse reflectance UV-Vis spectroscopy. Macroscopic radiation energy balances and the photoconversion of hydrogen rates were also determined in order to evaluate both PTEFs and quantum yields (φ). While PTEF efficiency factors were reported previously by our research group for water and air decontamination, the PTEF is now applied, for the first time, in this research, to hydrogen production.