Preparation of Au-OVs-BiOBr-P25 Z-scheme photocatalyst and its photocatalytic performance in overall water splitting
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摘要: 本研究以金纳米粒子为电子介质，制备了具有氧空位的Au-OVs-BiOBr-P25 Z-scheme三元光催化剂。采用全分解水制氢方法评价了该三元光催化剂的光催化活性。Au-OVs-BiOBr-P25在紫外-可见照射下，产氢速率可达384 μmol/（h·g）。UV-vis-DRS和瞬态光电流谱表明，Au-OVs-BiOBr-P25光催化活性的提高主要是由于其较宽的光响应范围和有效的载体分离。此外，全分解水是通过两电子途径发生的。该研究结果为开发更高效的光催化剂提供了新的思路。
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关键词:
- Au-OVs-BiOBr-P25 /
- 全分解水 /
- 氧缺陷 /
- 金 /
- H2O2
Abstract: Z-scheme photocatalyst holds great promise in photocatalytic H2 evolution. In this work, a ternary Au-OVs-BiOBr-P25 Z-scheme photocatalyst with oxygen vacancies was successfully prepared, in which Au nanoparticles were used as the electron mediators to introduce into BiOBr and P25. The photocatalytic activity of this ternary photocatalyst was evaluated by overall water splitting. The H2 evolution rate of Au-OVs-BiOBr-P25 achieves an amazing value of 384 μmol/(g·h) under UV-vis irradiation. UV-vis DRS and transient photocurrent spectra revealed that the enhanced photocatalytic activity of Au-OVs-BiOBr-P25 was mainly attributed to its widened photo-response range and effective carrier separation. Furthermore, the photocatalytic mechanism was systematically studied by EPR and Photoelectrochemical measurements, which indicated that the overall water splitting occurred through the two-electron pathway. This result will provide us new ideas for developing more efficient photocatalysts for photocatalytic H2 evolution.-
Key words:
- Au-OVs-BiOBr-P25 /
- overall water splitting /
- oxygen vacancy /
- Au nanoparticles /
- H2O2
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Figure 3 XPS spectra of Au-OVs-BiOBr- P25 (a) survey spectra, high resolution spectra of (b) Ti 2p spectrum, (c) O 1s spectrum, (d) Bi 4f spectrum, (e) Au 4f spectrum, (f) EPR spectra of BiOBr, P25, Au-OVs-BiOBr and Au-OVs-BiOBr-P25
Figure 4 SEM images of (a) P25, (b) BiOBr, (c-d) OVs-BiOBr- P25, (e) HRTEM image, (f) TEM image (inset is STEM) of Au-OVs-BiOBr-P25
Figure 6 UV-vis diffuse reflection spectra of BiOBr, P25, OVs-BiOBr-P25 and Au-OVs-BiOBr-P25
Figure 8 (a) H2 and H2O2 production over BiOBr, P25, OVs-BiOBr-P25 and Au-OVs-BiOBr-P25, (b) H2 and H2O2 production by Au-OVs-BiOBr-P25
Figure 9 ESR response of DMPO-OH spin adduct in water of Au-OVs-BiOBr-P25 under dark and UV-visible light at N2 atmosphere
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