科研之友
微信
新浪微博
Facebook
分享链接
摘要
The conversion of solar energy into chemical energy by photo-hydrolysis is considered as an effective way to solve current energy and environmental problems. The preparation of photo-catalysts with excellent activity is expected to promote the rapid development of photo-catalytic hydrogen production research. A two-step strategy is used to obtain a CdS-based photo-catalyst with enhanced photo-hydrogen production efficiency by improving the electron transport efficiency and the intrinsic electric field to promote electron separation. The CdS/Ag2S/NiS nanocomposites were prepared by a two-step method in this work. After characterization of the structure, optical properties and surface chemical state by XRD, EDS, XPS, TEM and UV-vis, it is found that Under visible light exposure (lambda=420 nm), when the ratio of NiS is 11 %, the sample got the highest hydrogen yield (3280 mu mol.g(-1).h(-1)), which is 2.8 times of CdS/Ag2S material, and also showing good cycle stability. The improved catalytic efficiency can be attributed to two points: the introduction of Ag2S provides more electro-chemical active sites and routes for nano-materials; the introduction of NiS builds an internal electric field to promote the transmission and separation of optical electrons and holes, and improve aquatic hydrogen capacity.
