Developing photocatalysts with efficient spatial charge separation and transfer as well as a high light-harvesting ability remains a key challenge. Here, we report a facile in situ process to decorate ultrathin g-C₃N₄ nanosheets (NSs) with a co-catalyst, Cu₂MoS₄, for photocatalytic water splitting. The as-obtained Cu₂MoS₄/g-C₃N₄ exhibits a superior photocatalytic H₂ evolution rate of 2170.5 μmol h⁻¹ g⁻¹ under visible light irradiation, which is nearly 677 and 34 times higher than that of bulk g-C₃N₄ and g-C₃N₄ NSs, respectively, and far exceeds that of most g-C₃N₄ catalysts modified with other sulphide co-catalysts reported in the literature, demonstrating that Cu₂MoS₄ can serve as a promising non-noble metal co-catalyst to couple with g-C₃N₄ for highly efficient photocatalysts. Structural characterization confirms the well-defined morphology of Cu₂MoS₄/g-C₃N₄ in which Cu₂MoS₄ hollow spheres are uniformly attached on the ultrathin g-C₃N₄ NSs with numerous micropores and vacancies. The optical properties indicate that Cu₂MoS₄/g-C₃N₄ possesses a superb visible light absorption ability. The photoluminescence spectra, photocurrent response, and electrochemical impedance spectra combine to prove the highly efficient separation and migration of photogenerated electrons and holes. All these factors synergistically enhance the photocatalytic activity of Cu₂MoS₄/g-C₃N₄ for photocatalytic water splitting, providing new insights into the rational design of high-performance visible light-driven photocatalysts based on earth-abundant elements.

中文翻译：

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在用Cu ₂ MoS ₄改性的超薄gC ₃ N ₄纳米片中作为无贵金属的助催化剂进行有效的空间电荷分离和转移，实现了卓越的可见光驱动的光催化水分解†

开发具有有效空间电荷分离和转移以及高光捕获能力的光催化剂仍然是关键的挑战。在这里，我们报告了一种简便的原位工艺，用助催化剂Cu ₂ MoS ₄装饰超薄gC ₃ N ₄纳米片（NSs），用于光催化水分解。所获得的Cu ₂ MoS ₄ / gC ₃ N ₄在可见光照射下表现出优异的光催化H ₂释放速率，为2170.5μmolh ^-1 g ^-1，比本体gC ₃ N高出近677倍和34倍。₄和gC ₃ N ₄ NSs分别远远超过大多数文献报道的用其他硫化物助催化剂改性的gC ₃ N ₄催化剂，表明Cu ₂ MoS ₄可以用作有前途的非贵金属助催化剂催化剂与gC ₃ N ₄偶联，形成高效的光催化剂。结构表征证实了Cu ₂ MoS ₄ / gC ₃ N ₄的明确定义的形态，其中Cu ₂ MoS ₄中空球均匀地附着在超薄gC _3上N _4个NS，具有许多微孔和空位。光学性质表明，Cu ₂ MoS ₄ / gC ₃ N ₄具有极好的可见光吸收能力。光致发光光谱，光电流响应和电化学阻抗谱相结合，证明了光生电子和空穴的高效分离和迁移。所有这些因素协同增强了Cu ₂ MoS ₄ / gC ₃ N ₄对光催化水分解的光催化活性，为基于地球丰富元素的高性能可见光驱动光催化剂的合理设计提供了新见识。