Reasonable design of heterojunction band structure and strengthening of the photothermal effect is an important method to promote the photothermal-assisted photocatalytic H2 production activity of photocatalysts. Herein, a composite material named as Co3O4/CNNVs S-scheme heterojunction nanoreactor was constructed by loading Co3O4 nanoparticles on the surface of g-C3N4 nanovesicles (CNNVs) through a simple hydrothermal method and used to achieve efficient photothermal-assisted photocatalytic H2 production. In the absence of Pt as a cocatalyst, Co3O4/CNNVs-22.5 exhibited a photocatalytic H2 production rate up to 772.9 μmol g-1h−1 under irradiation with a 300 W Xenon lamp, which is much higher than that of pure CNNVs (15.5 μmol g-1h−1). In the Co3O4/CNNVs photothermal-assisted photocatalytic system, the synergistic effect of the strong photothermal effect of Co3O4 nanoparticles and the thermal insulation effect of hollow CNNVs nanoreactor was shown to be the main reasons for promoting the surface temperature increase of the heterojunction photocatalyst, which effectively facilitates the separation and transfer of photo-generated carriers, thus increasing the photocatalytic H2 production. In addition, the S-scheme heterojunction formed between Co3O4 and CNNVs optimize the charge transfer path. This work presents a reasonable design of highly efficient photocatalyst with a S-scheme heterojunction nanoreactor for the photothermal-assisted photocatalysis.

中文翻译：

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用于增强光热辅助光催化 H2 生产的 S 型异质结催化纳米反应器的构建


合理设计异质结带结构，加强光热效应是促进光热辅助光催化H2生产活性的重要方法。本文通过简单的水热法将 Co3O4 纳米颗粒加载到 g-C3N4 纳米囊泡 （CNNV） 表面，构建了一种名为 Co3O4/CNNVs S 型异质结纳米反应器的复合材料，用于实现高效的光热辅助光催化 H2 生产。在没有 Pt 作为助催化剂的情况下，Co3O4/CNNVs-22.5 在用 300 W 氙灯照射下表现出高达 772.9 μmol g-1h-1 的光催化 H2 产生速率，远高于纯 CNNV （15.5 μmol g-1h-1）。在 Co3O4/CNNVs 光热辅助光催化体系中，Co3O4 纳米颗粒的强光热效应和空心 CNNVs 纳米反应器的隔热效应的协同作用是促进异质结光催化剂表面温度升高的主要原因，有效地促进了光生载流子的分离和转移，从而提高了光催化 H2 的产生。此外，Co3O4 和 CNNV 之间形成的 S 型异质结优化了电荷转移路径。本工作提出了一种具有 S 型异质结纳米反应器的高效光催化剂的合理设计，用于光热辅助光催化。