Chen Ben, Zhang Jin, Yu Jing, Wang Rui, He Beibei, Jin Jun, Wang Huanwen, Gong Yansheng
Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, PR China.
Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, PR China; Engineering Research Center of Nano-Geomaterials of Ministry of Education, China University of Geosciences, Wuhan 430074, PR China.
J Colloid Interface Sci. 2022 Feb;607(Pt 1):760-768. doi: 10.1016/j.jcis.2021.09.023. Epub 2021 Sep 8.
Poor visible light utilization and charge separation efficiency of TiO restrict its extensive application in the photocatalytic field. Herein, a specific Z-scheme TiO/Cu/ZnO heterojunction was successfully constructed by atomic layer deposition (ALD) technique and spray pyrolysis technology. Benefited from the surface plasmon resonance (SPR) effect of Cu and Z-scheme heterojunction, the visible light absorption capacity was greatly enhanced. Meanwhile, ZnO nanolayer coating, prepared by ALD technique, protects Cu element to hinder its oxidation, thus enhancing the separation efficiency of photogenerated carriers. Therefore, the photocatalytic hydrogen production performance was significant improved, exhibiting a maximum value of 342.0 µmol·g·h for the optimal B-T-0.1C-10Z (black TiO/0.1Cu/10 nm ZnO) sample without any noble-metal cocatalyst, which is higher than pure TiO (310.7 µmol·g·h, with 3 wt% Pt) synthesized by spray pyrolysis method under equal conditions. In addition, a possible mechanism for the enhanced performance was briefly discussed based on the experimental results.
TiO₂可见光利用效率低以及电荷分离效率差限制了其在光催化领域的广泛应用。在此，通过原子层沉积（ALD）技术和喷雾热解技术成功构建了一种特殊的Z型TiO₂/Cu/ZnO异质结。受益于Cu的表面等离子体共振（SPR）效应和Z型异质结，可见光吸收能力大大增强。同时，通过ALD技术制备的ZnO纳米层涂层保护Cu元素以防止其氧化，从而提高光生载流子的分离效率。因此，光催化产氢性能得到显著提高，对于最佳的B-T-0.1C-10Z（黑色TiO₂/0.1Cu/10 nm ZnO）样品，在没有任何贵金属助催化剂的情况下，其最大值为342.0 μmol·g⁻¹·h，高于在相同条件下通过喷雾热解方法合成的纯TiO₂（310.7 μmol·g⁻¹·h，含3 wt% Pt）。此外，基于实验结果简要讨论了性能增强的可能机制。
