Designing the heterojunction is an efficient method to boost the H evolution activity of photocatalysts. Here, to enhance the photocatalytic activity of ZnSe, ZnSe particles were attached to the flower-like CoO surface to form S-scheme heterojunctions. Under visible light exposure, the H production rate of the 3 wt%CoO/ZnSe (COZS) composite was 4197.36 μmol g h, which was approximately 5.5 and 18.2 times that of 1 %Pt-ZnSe (756.76 μmol g h) and ZnSe (230.52 μmol g h). X-ray photoelectron spectroscopy (XPS), electrochemical and photoluminescence results revealed that the recombination of carriers was effectively inhibited, which may be attributed to Co/Co autooxidation-reduction pairs and S-scheme heterojunction. According to the specific surface area results, CoO was beneficial in increasing the specific surface area of composite photocatalyst and exposing more active sites, thereby improving photocatalytic activity. Moreover, the optical test results displayed that the light absorbing range of COZS was broadened to the entire visible spectrum, which may promote the increase of photogenerated carriers. According to the band structure of COZS and the possible path of electron transfer, the photocatalytic mechanism was discussed.

中文翻译：

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一种新型Co3O4/ZnSe S型异质结光催化剂，具有高效的载流子分离和增强的光吸收，用于光催化析氢

设计异质结是提高光催化剂析氢活性的有效方法。为了增强 ZnSe 的光催化活性，将 ZnSe 颗粒附着在花状 CoO 表面形成 S 型异质结。在可见光照射下，3 wt%CoO/ZnSe（COZS）复合材料的产氢率为4197.36 μmol·gh，分别是1%Pt-ZnSe（756.76 μmol·gh）和ZnSe（230.52 μmol·gh）的5.5和18.2倍。呃）。 X射线光电子能谱（XPS）、电化学和光致发光结果表明，载流子的复合被有效抑制，这可能归因于Co/Co自氧化还原对和S型异质结。根据比表面积结果，CoO有利于增加复合光催化剂的比表面积，暴露出更多的活性位点，从而提高光催化活性。此外，光学测试结果表明，COZS的光吸收范围拓宽至整个可见光谱，这可能促进光生载流子的增加。根据COZS的能带结构和可能的电子转移路径，讨论了其光催化机理。