Fabricating efficient nanocatalysts with excellent visible light response, coupled with rapid charge separation and transfer efficiency is still the most challenge for solar-driven hydrogen (H₂) evolution. Herein, an ultrathin layered 2D/2D van der Waals heterojunction of ReS₂/high-crystalline g-C₃N₄ (CCN) is constructed for the first time to significantly boost photocatalytic H₂ production. The as-prepared optimized 15% ReS₂/CCN exhibits the highest H₂-evolution rate of 3.46 mmol g⁻¹h⁻¹ under visible light irradiation, a 2.7 fold enhancements over that of pristine CCN and is also much higher than ReS₂ alone. The excellent photocatalytic performance of ReS₂/CCN is mainly attributed to the efficient charge transport of highly crystalline CCN by eliminating deep defects, the strong visible light harvesting of ReS₂ nanoflakes, as well as the synergistic effect of an ultrathin layered 2D/2D heterojunction to rapidly enable charge-separation while inhibiting the charge recombination. This work provides an efficient photocatalyst for H₂ energy production, and sheds light on fundamental insight to a rational design of photo/electro nanocatalysts or heterojunction materials toward highly efficient photocatalyst.

制造具有优异可见光响应的高效纳米催化剂，以及快速的电荷分离和转移效率仍然是太阳能驱动的氢 (H ₂ ) 演化的最大挑战。在此，首次构建了ReS ₂ /高结晶 gC ₃ N ₄ (CCN)的超薄层状 2D/2D 范德华异质结，以显着提高光催化 H ₂的产生。所制备的优化的 15% ReS ₂ /CCN 在可见光照射下表现出最高的 H ₂释放速率，为 3.46 mmol g ^-1 h ^-1，比原始 CCN 提高了 2.7 倍，也远高于 ReS₂单独。_{ReS 2} /CCN优异的光催化性能主要归功于高结晶 CCN 通过消除深层缺陷的高效电荷传输、ReS ₂纳米薄片的强可见光捕获以及超薄层状 2D/2D 异质结的协同效应快速实现电荷分离，同时抑制电荷复合。这项工作为 H ₂能量生产提供了一种高效的光催化剂，并阐明了合理设计光/电纳米催化剂或异质结材料以实现高效光催化剂的基本见解。