Abstract
Designing an effective photocatalyst for hydrogen (H2) performance under visible irradiation with a decrease the band gap energy of semiconductor has been considered as an essential aspect in boosting the performance of photocatalytic reactions. Herein, we focus on evaluating the role of doping with Ir into SrTiO3 structure fabricated by hydrothermal method for H2 generation. The crystalline characteristics the Ir-SrTiO3 photocatalyst were carried out via XRD and FE-SEM. The chemical composition and the optical properties of the Ir-SrTiO3 were classified by EDX and UV-Vis spectra, respectively. The results showcased that the dramatically improved absorbing performances of Ir/SrTiO3 specimen could be governed by the presence of Ir impurity states in the forbidden energy gap causing a decrease in energy gap of SrTiO3. This work also revealed that Ir doped into SrTiO3 exhibited excellent photocatalytic H2 evolution compared with pristine SrTiO3 (~454 and ~325 mmol.h-1.g-1 H2 production under UV and visible light irradiation, respectively). A rational photocatalytic mechanism is projected to be able provide significant awareness for further research.
Highlights
Designing an effective photocatalyst for hydrogen (H2) performance under visible irradiation with a decrease the bandgap energy of semiconductor has been considered as an essential aspect in boosting the performance of photocatalytic reactions for hydrogen performance from the water-splitting process
It can be clearly seen that the photocatalytic performances for hydrogen generation of Ir-SrTiO3 exhibited a superior compared with that of pristine SrTiO3 under both UV light and visible light
It can be found that Ir-SrTiO3 photocatalyst possesses a dramatic H2 evolution with the amount of ~325 mmol.h−1.g−1, which was more than 14-fold as much as that of SrTiO3 under visible light, whereas, no H2 production is detected under visible illumination
Summary
Designing an effective photocatalyst for hydrogen (H2) performance under visible irradiation with a decrease the bandgap energy of semiconductor has been considered as an essential aspect in boosting the performance of photocatalytic reactions for hydrogen performance from the water-splitting process. The generation of photoexcited charge carriers is changed into reactive oxygen species (ROS) to split the water to H2 gas formation 7–9 Among these semiconductors developed in the recent year, titanium dioxide (SrTiO3) has been widely used in this field due to its non-toxic, cheap, environmentfriendly, stable against corrosion and photo-corrosion and the rapid the photoinduced electron-hole pairs under light excitation, contributing enhanced photocatalytic behaviors 10,11. Pt-loaded Rhdoped SrTiO3 exhibited a remarkably high photoelectrochemical behavior and the conversion of alcohol to efficiently form H2 under visible light This result was attributed to the well-driven energy band structures of the semiconductor via Rh doping, which provided the appropriate oxidation capabilities of photogenerated holes 14. Co-doping with tantalum and chromium (TiO2:Ta/Cr) or nickel and tantalum or niobium (TiO2:Ni/(Ta, Nb) showed a high photocatalytic performance response under visible light due
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