A Facile Low-Temperature Approach to Designing Controlled Amorphous-Based Titania Composite Photocatalysts with Excellent Noble-Metal-Free Photocatalytic Hydrogen Production

A microporous amorphous-based titania composite photocatalysts has been fabricated using a facile low-temperature (120 degrees C) synthetic method. Notably, we have successfully prepared the various stages of the amorphous/crystalline heterostructure by simply adjusting the pH value. The high-pH sample favors the formation of amorphous based titania composite structure. Additionally, the BET surface area of the sample increases with the increasing of the pH value, reaching a maximum of 358 m(2) g(-1) when the pH value is 12. Unexpectedly, the H-2 productivity of amorphous-based composite photocatalyst without noble metal co-catalyst increases significantly with the increasing pH value, which is attributed to the quickly increasing amorphous, and the highly active catalytic centers created by the synergistic effect between crystalline TiO2 and amorphous ZnO. This study demonstrates that it is possible to improve the properties of the amorphous-based composite photocatalyst by properly modifying the synthesis conditions. The approach presented herein can be applied to the research of controlled amorphous-based composite photocatalytic systems.