Abstract Converting sustainable solar energy into hydrogen energy over semiconductor-based photocatalytic materials provides an alternative to fossil fuel consumption. However, efficient photocatalytic splitting of water to realize carbon-free hydrogen production remains a challenge. Heterojunction photocatalysts with well-defined dimensionality and perfectly matched interfaces are promising for achieving highly efficient solar-to-hydrogen conversion. Herein, we report the fabrication of a novel type of protonated graphitic carbon nitride (PCN)/Ti3C2 MXene heterojunctions with strong interfacial interactions. As expected, the two-dimensional (2D) PCN/2D Ti3C2 MXene interface heterojunction achieves a highly improved hydrogen evolution rate (2181 μmol·g−1) in comparison with bulk g-C3N4 (393 μmol·g−1) and protonated g-C3N4 (816 μmol·g−1). The charge-regulated surfaces of PCN and the accelerated charge transport at the face-to-face 2D/2D Schottky heterojunction interface are the major contributors to the excellent hydrogen evolution performance of the composite photocatalyst.

中文翻译：

---

原位构建质子化 g-C3N4/Ti3C2 MXene 肖特基异质结以实现高效光催化制氢

摘要 通过基于半导体的光催化材料将可持续太阳能转化为氢能提供了替代化石燃料消耗的方法。然而，高效的光催化分解水以实现无碳制氢仍然是一个挑战。具有明确维度和完美匹配界面的异质结光催化剂有望实现高效的太阳能到氢气的转化。在此，我们报告了一种新型质子化石墨氮化碳 (PCN)/Ti3C2 MXene 异质结的制备，具有强界面相互作用。正如预期的那样，与块体 g-C3N4 (393 μmol·g-1) 和质子化 g-C3N4 相比，二维 (2D) PCN/2D Ti3C2 MXene 界面异质结实现了高度提高的析氢速率 (2181 μmol·g-1) -C3N4 (816 μmol·g-1)。