Solar-light driven water splitting to hydrogen and oxygen without sacrificial agents has gained tremendous attention due to the clean and renewable energy supply of the future. Herein, we report construction of Co₃O₄ quantum dots (QDs)/TiO₂ nanobelts (NBs) hybrids via a facile hydrothermal method for simultaneous H₂ and O₂ productions from pure water, with high evolution rates of 41.8 and 22.0 μmol h⁻¹ g⁻¹, respectively, which are significantly enhanced compared with TiO₂ NBs and Co₃O₄ materials. The Co₃O₄ QDs not only improve light sensitivity but also change the work function of TiO₂, promoting the transfer of electrons from TiO₂ to Co₃O₄ QDs and H₂ generation on the surface of Co₃O₄ QDs. Moreover, the size effect of Co₃O₄ QDs (∼3 nm) facilitates the electron trapping due to the shorter pathway, and the generation of heterojunctions favors to suppress the recombination of photo-excited carries.

由于未来的清洁和可再生能源供应，由太阳能驱动的水在不使用牺牲剂的情况下分解为氢和氧已经引起了极大的关注。在此，我们报告了通过一种简便的水热方法构建Co ₃ O ₄量子点（QDs）/ TiO ₂纳米带（NBs）杂化体，以同时从纯水中生产H ₂和O _2的情况，其高析出速率为41.8和22.0μmol·h ^-1  g ^-1，分别比TiO ₂ NBs和Co ₃ O ₄材料显着增强。钴₃ O ₄量子点不仅提高光灵敏度也改变TiO 2的功函数₂，促进电子的转移选自TiO ₂对Co ₃ ö _4个量子点和H ₂产生Co的表面上₃ ö _4个量子点。此外，Co ₃ O ₄ QDs（〜3 nm）的尺寸效应由于路径较短而促进了电子俘获，并且异质结的产生有利于抑制光激发载流子的复合。