| 초록 |
The composite of semiconductors with different band gaps and positions have an in-built potential energy gradient, which facilitates the charge pair separation with enhancing the photocatalytic and photo-electrochemical activities. Until now, many binary hybrid composites have been widely studied for environmental remediation and energy conversion applications but only limited studies have been published about ternary hybrid composites. In this study, we developed a ternary hybrid composite of CdS-TiO2-WO3 which was synthesized by two steps. The TiO2-WO3 hybrid was firstly synthesized by the modified xerogel method and then CdS was precipitated on the optimized TiO2-WO3 hybrid by hydrolysis. The binary hybrids (CdS-TiO2 and CdS-WO3) were also synthesized by the same precipitation method for the comparison with the ternary hybrid. All hybrids were characterized by XRD, TEM, EDS and UVDRS and the photocatalytic activities were tested by monitoring the reduction of polyoxometallate. The photoelectrochemical properties of the ternary hybrid electrode were also characterized by LSV, IPCE and EIS. The CdS-TiO2-WO3 ternary hybrid exhibited enhanced photocatalytic and photoelectrochemical activities. |
