Aimed at achieving high efficiency of photocatalytic hydrogen production from ammonia borane (NH₃BH₃, AB), a reduced graphene oxide (rGO)-modified TiO₂ photocatalyst was proposed for hydrogen production. In this study, rGO/TiO₂ photocatalysts with different rGO contents were prepared and characterized by XRD, UV–vis DRS, FTIR, Raman, and SEM. The experimental results showed that addition of rGO can reduce the band gap energy of TiO₂, and the band gap energy of rGO/TiO₂ varies with the content of rGO, and 1% rGO/TiO₂ has the lowest band gap energy of 2.96 eV. This indicates that the modification of TiO₂ by rGO not only increases the probability of electron transition but also promotes the separation of photoelectron and hole pairs due to the good conductivity of rGO so as to improve the quantum efficiency of photocatalysis. In addition, compared with pure TiO₂, rGO/TiO₂ shows a certain photocatalytic activity under the condition of light irradiation. Among the rGO/TiO₂ photocatalysts with different contents of rGO, 1% rGO/TiO₂ shows the best photocatalytic performance of ammonia borane hydrolysis, and the value of turnover frequency is 1088.93 μmol·min^–1·g^–1. Furthermore, the catalyst 1% rGO/TiO₂ shows perfect reusability, and its catalytic activity did not decrease significantly even after five reaction cycles.

中文翻译：

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rGO/TiO2复合材料在光催化反应器中氨硼烷水解高效制氢

为了实现氨硼烷（NH ₃ BH ₃，AB）光催化制氢的高效性，提出了一种还原氧化石墨烯（rGO）修饰的TiO ₂光催化剂用于制氢。在本研究中，制备了具有不同 rGO 含量的rGO/TiO ₂光催化剂，并通过 XRD、UV-vis DRS、FTIR、拉曼和 SEM 对其进行了表征。实验结果表明，rGO的加入可以降低TiO ₂的带隙能量，rGO/TiO ₂的带隙能量随rGO含量的不同而变化，1% rGO/TiO ₂的带隙能量最低为2.96 EV。这表明 TiO ₂的改性由于rGO良好的导电性，rGO不仅增加了电子跃迁的概率，而且促进了光电子和空穴对的分离，从而提高了光催化的量子效率。此外，与纯TiO ₂相比，rGO/TiO ₂在光照条件下表现出一定的光催化活性。在不同rGO含量的rGO/TiO ₂光催化剂中，1% rGO/TiO ₂的氨硼烷水解光催化性能最好，转换频率值为1088.93 μmol·min ^–1 ·g ^–1。此外，催化剂 1% rGO/TiO ₂ 显示出完美的可重复使用性，即使经过五个反应循环，其催化活性也没有显着下降。