School of Materials Science and Engineering, Tianjin University, Tianjin, 300350, China.
School of Materials Science and Engineering, Tianjin University, Tianjin, 300350, China; School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou, 730070, China; College of Chemistry Engineering and Materials Science, Quanzhou Normal University, Quanzhou, 362000, Fujian, China.
Environ Res. 2021 Jun;197:111002. doi: 10.1016/j.envres.2021.111002. Epub 2021 Mar 25.
Graphitic carbon nitride (g-CN), as the one of the most promising photocatalysts, usually relies on noble metal co-catalysts in the photocatalytic water splitting H evolution process, which greatly increases the use cost. Here, a zeolite imidazole framework (ZIF-67) derived Co@NC/g-CN composite was constructed through facile thermal condensation of ZIF-67 and melamine. The obtained Co@NC/g-CN composites can drive water splitting H evolution without any noble metal co-catalyst under simulated sunlight. The optimal sample exhibits the highest H evolution rate of 161 μmol g·h, which is 6 times of pure g-CN. The N doped carbon in carbonized ZIF-67 can not only quickly capture separated electrons from g-CN but also serve as the co-catalyst. The well dispersed cobalt intermediate on carbonized ZIF-67 also play a role in promoting electron conversion. The formation of junction between carbonized ZIF-67 and g-CN could promote quick charge carrier separation and transfer. This work provides a new idea for photocatalytic H evolution without noble metal co-catalysis.
石墨相氮化碳（g-CN）作为最有前途的光催化剂之一，通常在光催化水分解 H 演化过程中依赖于贵金属共催化剂，这大大增加了使用成本。在这里，通过 ZIF-67 和三聚氰胺的简单热缩聚构建了沸石咪唑骨架（ZIF-67）衍生的 Co@NC/g-CN 复合材料。所获得的 Co@NC/g-CN 复合材料在模拟阳光下无需任何贵金属共催化剂即可驱动水分解 H 演化。最佳样品表现出最高的 H 演化速率为 161 μmol g·h，是纯 g-CN 的 6 倍。碳化 ZIF-67 中的 N 掺杂碳不仅可以快速捕获来自 g-CN 的分离电子，还可以作为共催化剂。碳化 ZIF-67 上分散良好的钴中间体也在促进电子转化中发挥作用。碳化 ZIF-67 和 g-CN 之间形成的连接可以促进快速的载流子分离和转移。这项工作为无贵金属共催化剂的光催化 H 演化提供了新的思路。
