標題: CdS/CdSe co-sensitized brookite H:TiO2 nanostructures: Charge carrier dynamics and photoelectrochemical hydrogen generation
作者: Chang, Yung-Shan
Choi, Mingi
Baek, Minki
Hsieh, Ping-Yen
Yong, Kijung
Hsu, Yung-Jung
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: Brookite TiO2;Hydrogen doping;Sensitization;Interfacial charge dynamics;PEC hydrogen production
公開日期: 5-六月-2018
摘要: In this study, we have synthesized CdS/CdSe co-sensitized brookite TiO2 nanostructures with hydrogen doping (H:TiO2/CdS/CdSe) in a facile solution reaction and studied their PEC performances. Compared to undoped brookite TiO2, the H:TiO2/CdS/CdSe composites exhibit much enhanced photocurrent generation, which originates from the improved charge transfer kinetics endowed by hydrogen doping and sensitization. Time-resolved photoluminescence (PL) and electrochemical impendence spectroscopy (EIS) are employed to explore the charge transfer dynamics between sensitizers and TiO2 and charge carrier kinetics at the semiconductor/electrolyte interface. According to the analytical results, sensitizations of TiO2 are found to enhance the charge separation efficiency. Besides, the hydrogen doping into TiO2 generates oxygen vacancy states, providing additional charge transfer pathway and prohibiting charge recombination, beneficial for enhancing the PEC performances as well. Based on the charge dynamics data, we further develop charge transfer models for TiO2/CdS/CdSe and H:TiO2/CdS/CdSe. The findings from this work can help understanding the charge transfer dynamics in brookite TiO(2)based composite systems as well as designing versatile photoelectrodes for solar energy conversion.
URI: http://dx.doi.org/10.1016/j.apcatb.2017.11.063
http://hdl.handle.net/11536/144502
ISSN: 0926-3373
DOI: 10.1016/j.apcatb.2017.11.063
期刊: APPLIED CATALYSIS B-ENVIRONMENTAL
Volume: 225
起始頁: 379
結束頁: 385
顯示於類別:期刊論文