Nano Black Titania and Solar Applications

Sunday, 5 October 2014: 17:00
Sunrise, 2nd Floor, Mars 1-4 (Moon Palace Resort)
C. Yang, Z. Wang, T. Lin (Shanghai Institute of Ceramics, Chinese Academy of Sciences), and F. Huang (Peking University, Shanghai Institute of Ceramics, Chinese Academy of Sciences)
Searching of efficient semiconductor photocatalysts utilizing visible-light solar energy for hydrogen generation from water splitting remains a great challenge. Many efforts have been focused on enhancing visible light absorption by narrowing the bandgap of TiO2, but their visible-light power conversion still remains insufficient. Here we report a new low-temperature approach to synthesize black titania with a unique amorphous core/crystalline shell structure (TiO2@TiO2-x). This black titania improves visible and infrared light absorption and ultra-visible light photocatalytic activity. More importantly, the incorporation of nonmetal elements (X = H, N, S, I) into the shells significantly boosts visible-light photocatalytisis on both water splitting and waste-water cleaning. It is worth noting that the amorphous shell and the X termination as a strategy are necessary for titania to narrow bandgap and receive more efficient visible-light photocatalysis than any other reported titania.