The generation of green hydrogen (H₂) energy using sunlight is of great significance to solve the worldwide energy and environmental issues. Particularly, photocatalytic H₂ production is a highly promising strategy for solar‐to‐H₂ conversion. Recently, various heterostructured photocatalysts with high efficiency and good stability have been fabricated. Among them, 2D/2D van der Waals (VDW) heterojunctions have received tremendous attention, since this architecture can promote the interfacial charge separation and transfer and provide massive reactive centers. On the other hand, currently, most photocatalysts are composed of metal elements with high cost, limited reserves, and hazardous environmental impact. Hence, the development of metal‐free photocatalysts is desirable. Here, a novel 2D/2D VDW heterostructure of metal‐free phosphorene/graphitic carbon nitride (g‐C₃N₄) is fabricated. The phosphorene/g‐C₃N₄ nanocomposite shows an enhanced visible‐light photocatalytic H₂ production activity of 571 µmol h⁻¹ g⁻¹ in 18 v% lactic acid aqueous solution. This improved performance arises from the intimate electronic coupling at the 2D/2D interface, corroborated by the advanced characterizations techniques, e.g., synchrotron‐based X‐ray absorption near‐edge structure, and theoretical calculations. This work not only reports a new metal‐free phosphorene/g‐C₃N₄ photocatalyst but also sheds lights on the design and fabrication of 2D/2D VDW heterojunction for applications in catalysis, electronics, and optoelectronics.

中文翻译：

---

无金属2D / 2D磷/ g-C3N4范德华异质结，可显着增强可见光光催化制氢

利用阳光产生绿色氢（H ₂）能量对于解决世界范围的能源和环境问题具有重要意义。特别是，光催化生产H ₂是将太阳能转化为H ₂的极有希望的战略转换。近来，已经制备了具有高效率和良好稳定性的各种异质结构光催化剂。其中，2D / 2D范德华（VDW）异质结受到了极大的关注，因为这种体系结构可以促进界面电荷的分离和转移并提供大量的反应中心。另一方面，当前，大多数光催化剂由金属元素组成，这些金属元素成本高，储量有限并且对环境有害。因此，需要开发无金属的光催化剂。在此，制造了一种新型的无金属磷/石墨碳氮化物（g-C ₃ N ₄）的2D / 2D VDW异质结构。磷/ g‐C ₃ N ₄在18 v％的乳酸水溶液中，纳米复合材料显示出571 µmol h ^-1 g ^-1的增强的可见光光催化H ₂产生活性。改进的性能来自于2D / 2D接口处的紧密电子耦合，并被先进的表征技术所证实，例如，基于同步加速器的X射线吸收近边缘结构以及理论计算。这项工作不仅报告了一种新型的不含金属的磷/ g-C ₃ N ₄光催化剂，而且还为催化，电子和光电应用中的2D / 2D VDW异质结的设计和制造提供了启示。