ZnS/ZnO异质结光催化剂的应用研究进展

Research Progress on ZnS/ZnO Heterojunction Photocatalysts

摘要:

硫化锌（ZnS）和氧化锌（ZnO）具有无毒、环境友好和制备简单等优点，并且常温下拥有优异的物理化学特性和催化活性，所以一直都是光催化领域研究的热点材料。然而，单一ZnS和ZnO光催化剂表现出低的太阳能利用率、量子效率和光稳定性，极大地限制了它们的实际应用。将ZnS与ZnO复合形成异质结不仅可以拓宽光吸收波长范围，而且能促进载流子的转移和空间分离，增强光催化活性和稳定性。归纳了半导体异质结（Ⅱ型异质结、Z型异质结和S型异质结）中载流子的转移路径及光催化机理，综述了ZnS/ZnO异质结在能源和环境催化领域中的应用研究进展及其光催化性能的影响因素和提升策略，最后对其目前存在的问题和未来的发展方向进行了总结与展望。

Abstract:

Zinc sulfide (ZnS) and zinc oxide (ZnO) have always been hot research materials in the field of photocatalysis owing to their non-toxicity, environmental friendliness, simple synthesis, excellent physical/chemical properties and high catalytic activity. However, single ZnS and ZnO photocatalysts usually suffer from low solar energy utilization, poor quantum efficiency and bad photostability, which greatly limit their practical applications. Constructing ZnS/ZnO heterojunction can effectively broaden the light-absorption wavelength range and simultaneously promote the transfer and spatial separation of carriers, thereby achieving enhanced photocatalytic activity and stability. Herein, the carrier transfer pathways and photocatalytic mechanism of various types of semiconductor heterojunctions (Type II, Z-scheme and S-scheme) are summarized. The research progress of ZnS/ZnO heterojunction in the field of energy and environmental catalysis is reviewed, and the effect factors and improvement strategies of photocatalytic performance are expanded. The existing problems and future development direction of ZnS/ZnO heterojunction are summarized and prospected.