Ning Xiaofeng, Zhen Wenlong, Zhang Xuqiang, Lu Gongxuan
State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China.
University of Chinese Academy of Sciences, Beijing, 100049, China.
ChemSusChem. 2019 Apr 5;12(7):1410-1420. doi: 10.1002/cssc.201802926. Epub 2019 Mar 12.
Photocatalytic splitting of water into hydrogen and oxygen by using visible light is considered to be a clean, green, and renewable route for solar energy conversion and storage. Although the Zn Cd S catalysts show comparatively higher activity for photocatalytic hydrogen generation under visible-light irradiation, they suffer from serious photocorrosion during the photocatalytic reaction. The deposition of a protective layer over the Zn Cd S catalysts is believed to be an effective way to inhibit photocorrosion. However, only a few materials exhibit satisfactory catalytic properties for hydrogen evolution as well as a good protection ability. In this work, a new Zn Cd S photocatalyst was developed for water splitting under visible-light illumination by assembling an ultrathin NiO layer over Zn Cd S through an in situ photodeposition method. The as-prepared NiO/Zn Cd S showed significantly higher activity for overall water splitting compared with Pt/Zn Cd S under the same conditions without photocorrosion. An apparent quantum efficiency of 0.66 % was achieved for hydrogen evolution at 430 nm with an accomplished multicycle stability for up to 12 h without any significant decay. The strong electronic coupling between the NiO layer and Zn Cd S also promoted efficient charge separation and migration.
利用可见光将水催化分解为氢气和氧气被认为是一种用于太阳能转换和存储的清洁、绿色且可再生的途径。尽管硫化锌镉催化剂在可见光照射下对光催化产氢表现出相对较高的活性，但它们在光催化反应过程中会遭受严重的光腐蚀。在硫化锌镉催化剂上沉积一层保护层被认为是抑制光腐蚀的有效方法。然而，只有少数材料对析氢表现出令人满意的催化性能以及良好的保护能力。在这项工作中，通过原位光沉积法在硫化锌镉上组装超薄氧化镍层，开发了一种用于可见光照射下光解水的新型硫化锌镉光催化剂。在相同条件下且无光腐蚀的情况下，所制备的氧化镍/硫化锌镉对整体水分解表现出明显更高的活性。在430 nm处析氢的表观量子效率达到了0.66%，并实现了长达12小时的多循环稳定性，且没有任何明显衰减。氧化镍层与硫化锌镉之间的强电子耦合也促进了有效的电荷分离和迁移。
