CdS is a photocatalyst known for its desirable bandgap and availability but it is limited by photocorrosion and inefficiency issues in practical applications. According to band engineering theory, regulating the width of bonding region that exists between cubic phase and hexagonal phase, we design a suitable phase junction and achieve effective separation of electron-hole pairs. Thus, the problems caused by photocorrosion and phase exclusion can be resolved. The optimal photocatalytic activity of the prepared material is 4.9 mmol h⁻¹ g⁻¹ with 41.5% quantum efficiency at the wavelength of 420 nm, which is 60 times higher than that of the initial samples (cubic or hexagonal phase), and keeps high photocatalytic stability. This novel construction approach can be useful in designing ideal band structures and matching the phase bandgap of other binary sulfides.

中文翻译：

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CdS相接点：高效稳定的制氢光催化剂

CdS是一种光催化剂，以其理想的带隙和可利用率而闻名，但在实际应用中受到光腐蚀和效率低下的限制。根据能带工程理论，通过调节存在于立方相和六方相之间的键合区域的宽度，我们设计了合适的相结并实现了电子-空穴对的有效分离。因此，可以解决由光腐蚀和相排斥引起的问题。所制备材料的最佳光催化活性为4.9 mmol h ^-1  g ^-1在420 nm波长处具有41.5％的量子效率，是初始样品（立方或六方相）的60倍，并且保持了高的光催化稳定性。这种新颖的构造方法可用于设计理想的能带结构和匹配其他二元硫化物的相带隙。