Abstract
The TiO2/Mn0.2Cd0.8S hollow heterojunction with Mn/Cd bimetallic synergy is prepared via a continuous chemical-hydrothermal-etching method. There, the TiO2 shell and Mn0.2Cd0.8S nanoparticles were deposited by continuous chemical-hydrothermal method on the surface of SiO2 template, and subsequently the SiO2 template was etched via a chemical method. Evaluated by HER, the as-prepared TiO2/Mn0.2Cd0.8S hollow heterojunction exhibits an obvious photocatalytic enhancement to about ~5822.94 μmol/g∙h(~40 folds of TiO2, ~7 folds of Mn0.2Cd0.8S), which can be mainly ascribed to that, the narrow band gap of Mn0.2Cd0.8S can increase the visible light energy utilization, the TiO2/Mn0.2Cd0.8S heterojunction and Mn/Cd bimetallic synergy can separate/transfer the photo-generated charge carriers efficiently, and the sufficient specific surface areas and actives from 3D hollow structure can promote the charge carrier diffusing into water quickly for achieving H2 generation. Additionally, the hollow 3D structure can provide a decent physical-chemical stability to improve the photocatalytic stability.
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