Developing high-efficient and low-cost photocatalysts is of great significance yet challenging for photocatalytic hydrogen evolution. Herein, we report a 2D/2D Ru-modulated CoP nanosheets (Ru-CoP-x, where x refers the Ru-to-Co molar ratio)/g-C₃N₄ nanosheets (GCN NSs) ternary hybrid as a photocatalyst for hydrogen evolution under visible light. The optimal photocatalyst 25% Ru-CoP-1:8/GCN NSs exhibits an excellent hydrogen evolution rate of 1172.5 µmol g⁻¹ h⁻¹ under visible light with a high apparent quantum efficiency (AQE) of 3.49% at 420 nm, which is close to Pt/g-C₃N₄ photocatalytic system and higher than most reported transition metal phosphides (TMP)/g-C₃N₄ photocatalytic system. Experimental results indicate that the higher photocatalytic hydrogen evolution performance can be mainly attributed to the binary Ru-CoP-x co-catalyst with efficient charge separation and promoted surface water reduction kinetics, and the 2D/2D self-assembly structure with strong interface Schottky effect and short charge transport distance. This study provides a new approach to develop cost-effective Pt-alternative co-catalysts for photocatalytic hydrogen evolution by incorporating a small amount of ruthenium into the transition metal phosphides.

开发高效，低成本的光催化剂具有重要意义，但对光催化制氢有挑战性。在这里，我们报告2D / 2D Ru调制的CoP纳米片（Ru-CoP -x，其中x表示Ru-Co摩尔比）/ gC ₃ N ₄纳米片（GCN NSs）三元杂化物作为光催化氢释放的催化剂在可见光下。最佳的光催化剂25％Ru-CoP-1：8 / GCN NSs在可见光下具有1172.5 µmol g ^-1 h ^-1的优异氢析出速率，并在420 nm处具有3.49％的高表观量子效率（AQE）。接近Pt / gC ₃ N ₄光催化系统，并且比大多数报道的过渡金属磷化物（TMP）/ gC ₃ N ₄光催化系统要高。实验结果表明，较高的光催化制氢性能主要归因于二元Ru-CoP -x助催化剂，具有高效的电荷分离和促进的表面水还原动力学，以及具有强界面肖特基效应的2D / 2D自组装结构电荷运输距离短。这项研究提供了一种新的方法，通过将少量钌掺入过渡金属磷化物中来开发具有成本效益的Pt替代助催化剂，以进行光催化制氢。