Both fast recombination of photogenerated electron-hole pairs and quick photocorrosion limit CdS’s application in hydrogen production. To address this dilemma, herein, we designed and synthesized a millimetre-sized chitosan-CdS xerogel bead photocatalyst (CXB@CdS) to expound the mechanisms of photocorrosion resistant and enhanced photocatalytic H₂ production. NH₂ and OH groups of chitosan contribute to the spatial separation of photogenerated electron-hole pairs lead to inhibition of CXB@CdS photocorrosion, which guaranteed stable HER performance for 55 h. Directional migration of photogenerated holes from valence band (VB) of CXB@CdS to the highest occupied molecular orbital (HOMO) of chitosan was demonstrated due to the existence of lone pair electrons on NH₂ and OH groups. This work can shed some light on the mechanism of natural polymers with rich functional groups modifying metal sulfides for effective photocorrosion inhibition and highly enhanced photocatalytic activities.

光生电子-空穴对的快速重组和快速的光腐蚀都限制了CdS在制氢中的应用。为了解决这个难题，在本文中，我们设计并合成了毫米大小的壳聚糖-CdS干凝胶珠光催化剂（CXB @ CdS），以阐明抗光腐蚀和增强光催化H ₂产生的机理。壳聚糖的NH ₂和OH基团有助于光生电子-空穴对的空间分离，从而抑制CXB @ CdS光腐蚀，从而保证HER性能稳定55小时。由于存在孤对电子，证明了光生空穴从CXB @ CdS的价带（VB）向壳聚糖的最高占据分子轨道（HOMO）的定向迁移。NH ₂和OH基团。这项工作可以阐明具有丰富官能团的天然聚合物修饰金属硫化物以有效抑制光腐蚀和高度增强光催化活性的机理。