Phase junction CdS: High efficient and stable photocatalyst for hydrogen generation
Phase junction CdS: High efficient and stable photocatalyst for hydrogen generation
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相结CdS：高效稳定的制氢光催化剂
DOI：
10.1016/j.apcatb.2017.09.002
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发表时间：
2018-02-01
期刊：
影响因子：
--
通讯作者：
Hao, Xiaopeng
中科院分区：
文献类型：
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作者：
Ai, Zizheng;Zhao, Gang;Hao, Xiaopeng
CdS是一种光催化剂，以其理想的带隙和可用性而闻名，但它在实际应用中受到光腐蚀和低效率问题的限制。根据能带工程理论，通过调节立方相和六方相之间的成键区宽度，设计合适的相位结，实现电子空穴对的有效分离。从而解决了光腐蚀和相排斥引起的问题。在420 nm波长处，所制备的材料的最佳光催化活性为4.9 mmol h（-1）g（-1），量子效率为41.5%，比初始样品（立方相或六方相）提高了60倍，并保持了较高的光催化稳定性。这种新的构造方法可以用于设计理想的能带结构和匹配其他二元硫化物的相位带隙。
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 nrn, 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.