Photocatalytic hydrogen evolution from water splitting is a promising strategy for realizing the vision of carbon neutrality. Herein, a novel SrTiO₃-SrCO₃ n-n heterojunction was used for the first time for water splitting to generate H₂. The heterojunction was synthesized by a soft chemical one-pot hydrothermal method. The SrTiO₃-SrCO₃ loading with 3 wt% Pt shows the maximum photocatalytic H₂ evolution rate of 3.62 mmol h⁻¹g⁻¹ under simulated sunlight irradiation, which is 20.1 times higher than that of pristine SrTiO₃. The apparent quantum efficiency of SrTiO₃-SrCO₃ reaches 21.73% at 313 nm, and it shows good stability during cyclic experiment. The formation of compact SrTiO₃-SrCO₃ heterojunction with strong interfacial electronic interaction promotes the transmission and separation of photo-generated carriers. The results of XPS, PL, PC, EIS and DFT support the mechanism of improving photocatalytic activity based on carrier dynamics. This work provides a facile and effective method to enhance the activity of SrTiO₃-based heterojunction photocatalysts.

从水分解中光催化析氢是实现碳中和愿景的一种有前途的策略。在此，首次使用新型SrTiO ₃ -SrCO ₃ nn异质结进行水分解产生H ₂。采用软化学一锅法水热法合成异质结。载有 3 wt% Pt的 SrTiO ₃ -SrCO ₃在模拟太阳光照射下的最大光催化 H ₂释放速率为 3.62 mmol h ^{− 1} g ^{− 1 ，是原始 SrTiO} ₃的 20.1 倍。_{SrTiO 3}的表观量子效率-SrCO ₃在313 nm处达到21.73%，在循环实验中表现出良好的稳定性。具有强界面电子相互作用的致密SrTiO ₃ -SrCO ₃异质结的形成促进了光生载流子的传输和分离。XPS、PL、PC、EIS 和 DFT 的结果支持基于载流子动力学提高光催化活性的机制。该工作为提高SrTiO ₃基异质结光催化剂的活性提供了一种简便有效的方法。