Efficient hydrogen generation of vector Z-scheme CaTiO3/Cu/TiO2 photocatalyst assisted by cocatalyst Cu nanoparticles
2022
Yang, Junfeng | Shi, Chenyang | Dong, Yanhui | Su, He | Sun, Hang | Guo, Yao | Yin, Shengyan
Herein, the CaTiO₃/Cu/TiO₂ all-solid-state Z-scheme heterojunction is successfully designed via Cu nanoparticles situating at the interface between CaTiO₃ and TiO₂ with a new synthesis route. Interestingly, TiO₂ nanosheets are generated in-situ on the surface of CaTiO₃ in the second step hydrothermal reaction. The lifetimes of photoexcited carriers, photoluminescence emission spectra and transient photocurrent response tests have confirmed that the efficient Z-scheme charge transmission path of the CaTiO₃/Cu/TiO₂ is beneficial to facilitate the separation of photogenerated carriers and reduce their recombination efficiency. As expected, the hydrogen generation rate of CaTiO₃/Cu/TiO₂ is increased to 23.550 mmol g⁻¹h⁻¹ with the appropriate amount of copper loading, which is about 981 times and 93 times higher than that of pristine CaTiO₃ (0.024 mmol g⁻¹h⁻¹) and CaTiO₃/TiO₂ (0.253 mmol g⁻¹h⁻¹), respectively. Furthermore, the CaTiO₃/Cu/TiO₂ sample shows good stability in cycle experiments. Particularly, experimental results show that the non-noble metal Cu nanoparticles can be an effective electron mediator. And these merits strongly demonstrate that the CaTiO₃/Cu/TiO₂ composites have potential application in photocatalytic field. This study can provide fundamental guidance for designing rationally efficient non-noble metal vector Z-scheme system photocatalysts with outstanding photocatalytic H₂ generation performance.
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