It is a considerable challenge to design a highly efficient photocatalyst for overall water splitting. Herein, a zero-dimension/two-dimension (0D/2D) TiO₂ nanodots/g-C₃N₄ step-scheme (S-scheme) photocatalyst (TOCN) for overall water splitting was prepared by a facile phase interfacial reaction. TOCN showed higher photocatalytic water splitting activity under simulated sunlight, which is about 2.2 and 1.7 times higher than TiO₂ nanodots and g-C₃N₄, respectively. The enhancement of photocatalytic performance can be mainly attributed to the formation of S-scheme heterojunction, rather than normal type-II heterojunction, which could not only improve charge separation but also remain the redox ability of TiO₂ and g-C₃N₄. This work presents a simple method to construct an efficient photocatalyst with S-Scheme heterojunction for overall water splitting.

设计一种用于整体水分解的高效光催化剂是一个相当大的挑战。在此，通过简单的相界面反应制备了用于整体水分解的零维/二维（0D/2D）TiO ₂纳米点/gC ₃ N ₄阶梯式（S-scheme）光催化剂（TOCN）。TOCN在模拟阳光下表现出更高的光催化分解水活性，比TiO ₂纳米点和gC ₃ N ₄高约2.2和1.7倍， 分别。光催化性能的增强主要归因于形成了 S 型异质结，而不是正常的 II 型异质结，这不仅可以改善电荷分离，而且还保留了 TiO ₂和 gC ₃ N ₄的氧化还原能力。这项工作提出了一种简单的方法来构建具有 S-Scheme 异质结的高效光催化剂，用于整体水分解。