Abstract

To construct the heterojunctions of TiO₂ with other compounds is of great importance for overcoming its inherent shortages and improving the visible-light photocatalytic performance. Here we propose the construction of TiO₂/covalent organic framework (COF) heterojunction with tight connection by a supercritical CO₂ (SC CO₂) method, which helps bridging the transformation paths for photo-induced charge between TiO₂ and COF. The produced TiO₂/COF heterojunction performs a H₂ evolution of 3,962 µmol·g⁻¹·h⁻¹ under visible-light irradiation, which is ∼ 25 times higher than that of pure TiO₂ and 4.5 folds higher than that of TiO₂/COF synthesized by the conventional solvothermal method. This study opens up new possibilities for constructing heterojunctions for solar energy utilization.

中文翻译：

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超临界CO 2产生可见光响应的TiO 2 / COF异质结，具有增强的电子-空穴分离能力，可实现高性能的氢气释放

摘要

用其他化合物构建TiO ₂的异质结对克服其固有的不足和改善可见光的光催化性能具有重要意义。在这里，我们提出了一种通过超临界CO ₂（SC CO ₂）方法紧密连接的TiO ₂ /共价有机骨架（COF）异质结的构建方法，这有助于桥接TiO ₂和COF之间的光生电荷的转变路径。产生的TiO ₂ / COF异质结在可见光照射下的H ₂析出量为3,962 µmol·g ^-1 ·h ^-1，约为纯TiO _2的25倍。比传统的溶剂热法合成的TiO ₂ / COF高4.5倍。这项研究为构建利用太阳能的异质结开辟了新的可能性。