It is a great challenge to design efficient noble-metal-free cocatalysts used in hydrogen production under visible light irradiation. Herein, it is demonstrated that a cobalt-sulfide material (Co₉S₈) with the advantages of excellent functionality of charge transfer can be used as an effective cocatalyst to improve the photocatalytic hydrogen evolution of 2D graphitic carbon nitride (2D g-C₃N₄). Interestingly, the developed CoN_x bonds can strengthen the interface connection and ensure effective charge migration. Finally, the photocatalytic hydrogen evolution activity can be greatly improved. The optimal catalyst (20% Co₉S₈/2D g-C₃N₄) shows 237.9 μmol hydrogen evolution at 5 h, which is 140 times that of 2D g-C₃N₄. The good result indicates the positive role of the Co₉S₈ cocatalyst for active site engineering on 2D g-C₃N₄.

中文翻译：

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二维硫化碳与硫化钴助催化剂的表面工程用于增强光催化氢的释放

设计在可见光照射下用于制氢的高效无贵金属助催化剂是一个巨大的挑战。在此证明，具有优异的电荷转移功能的优点的硫化钴材料（Co ₉ S ₈）可以用作有效的助催化剂，以改善二维石墨碳氮化物（2D gC ₃ N _4）的光催化氢析出。）。有趣的是，在开发有限公司 ň _X键可以增强接口的连接，并确保有效的电荷迁移。最后，可以大大提高光催化制氢活性。最佳催化剂（20％Co ₉ S ₈ / 2D gC₃ N ₄）在5 h处释放出237.9μmol氢，是2D gC ₃ N _4的140倍。良好的结果表明Co ₉ S ₈助催化剂对2D gC ₃ N ₄上的活性位点工程具有积极作用。