Mott–Schottky heterojunctions have been widely used to enhance photocatalytic activity by improving the separation and transfer of photogenerated charges. However, an in-depth exploration of design concepts and photocatalytic mechanisms of Mott–Schottky heterojunctions is still lacking. In this work, we have constructed the two-dimensional (2D) ultrathin Mott–Schottky heterojunction MoC@NG@ZIS by combining the photon capturer ZnIn₂S₄ (ZIS) with electrocatalyst MoC@NG (nitrogen-doped graphene loaded with MoC quantum dots). The addition of MoC@NG not only boosts the reaction kinetics but also provides abundant and high-activity reactive sites for hydrogen production. Meanwhile, the 2D ultrathin structure and plentiful interfaces of Mott–Schottky heterojunction MoC@NG@ZIS facilitate mass transfer and provide numerous channels for charge transport. Spectroscopic and electrochemical analyses reveal that MoC@NG@ZIS has extended light absorption and enhanced photoelectric response. Furthermore, due to the presence of a Schottky barrier, efficient charge separation is realized through the unidirectional pathway of charge transfer. Therefore, the optimized photocatalyst MoC@NG-15@ZIS exhibits a great hydrogen evolution performance of 32.96 mmol g⁻¹ h⁻¹ with excellent photochemical stability, which is higher than those of most reported ZIS-based photocatalysts. This study provides constructive insights into the design of efficient Mott–Schottky heterojunctions and reveals the mechanism of performance enhancement.

中文翻译：

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具有增强动力学响应的莫特-肖特基异质结 MoC@NG@ZIS 促进光催化制氢

莫特-肖特基异质结已被广泛用于通过改善光生电荷的分离和转移来提高光催化活性。然而，仍然缺乏对莫特-肖特基异质结的设计理念和光催化机制的深入探索。_{在这项工作中，我们通过结合光子捕获器 ZnIn 2} S ₄构建了二维 (2D) 超薄莫特-肖特基异质结 MoC@NG@ZIS(ZIS) 与电催化剂 MoC@NG（载有 MoC 量子点的氮掺杂石墨烯）。MoC@NG 的添加不仅提高了反应动力学，而且为制氢提供了丰富的高活性反应位点。同时，莫特-肖特基异质结 MoC@NG@ZIS 的二维超薄结构和丰富的界面促进了传质并为电荷传输提供了众多通道。光谱和电化学分析表明，MoC@NG@ZIS 具有扩展的光吸收和增强的光电响应。此外，由于肖特基势垒的存在，通过电荷转移的单向路径实现了有效的电荷分离。^{因此，优化后的光催化剂 MoC@NG-15@ZIS 表现出 32.96 mmol g -1}的良好析氢性能。h ^-1具有优异的光化学稳定性，高于大多数报道的基于 ZIS 的光催化剂。这项研究为高效莫特-肖特基异质结的设计提供了建设性的见解，并揭示了性能增强的机制。