College of Environment and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, China.
School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China.
Sci Total Environ. 2022 Feb 25;809:151114. doi: 10.1016/j.scitotenv.2021.151114. Epub 2021 Oct 21.
Carbon nitride (CN) as the photocatalytic hydrogen production catalyst has attracted great attentions but suffering from a poor performance due to the unsatisfied energy band gap and the low separation efficiency of photogenerated carriers. Herein, we create a simple method to construct a novel CN-based photocatalyst, i.e., the N, P, O co-doped carbon filled CN microtube, which presents a narrow band gap, a high separation efficiency of photogenerated carriers, and a good stability. In this novel structure, the tubular morphology of CN ensures a narrow band gap, and the N, P, O co-doped carbon facilitates the transfer of photogenerated electrons. Coupling these two further reduces the energy band gap and improves the separation efficiency. For the photocatalytic hydrogen evolution under the visible light, the optimal sample presents an ultrahigh hydrogen evolution rate of 1149.71 μmol g h ranking at the top level, which is 112.60 times that of traditional bulk CN. In addition, it also has a high reusability and good stability after four cycle experiments. This study has provided a new viewpoint to design or develop the high-efficient photocatalysts for hydrogen production.
氮化碳（CN）作为光催化制氢催化剂引起了广泛关注，但由于其能带隙不满足要求和光生载流子的分离效率低，其性能仍有待提高。在此，我们提出了一种简单的方法来构建一种新型的基于 CN 的光催化剂，即 N、P、O 共掺杂碳填充的 CN 微管，它具有较窄的能带隙、较高的光生载流子分离效率和较好的稳定性。在这种新型结构中，CN 的管状形态确保了较窄的能带隙，而 N、P、O 共掺杂碳则有利于光生电子的转移。这两种方式的结合进一步降低了能带隙并提高了分离效率。在可见光下的光催化析氢反应中，最佳样品的析氢速率高达 1149.71 μmol g h，处于领先水平，是传统块状 CN 的 112.60 倍。此外，经过四次循环实验后，它仍具有较高的可重复使用性和良好的稳定性。这项研究为设计或开发高效的光催化制氢催化剂提供了新的视角。
