Journal of Inorganic Materials ›› 2018, Vol. 33 ›› Issue (12): 1343-1348.doi: 10.15541/jim20180126

• RESEARCH PAPER • Previous Articles     Next Articles

CdS/TiO2 Nanocrystalline Films: In-situ Synthesis and Photoelectrochemical Performance

Can-Jun LIU1(), Shu CHEN1, Jie LI2()   

  1. 1. Key Laboratory of Theoretical Chemistry and Molecular Simulation, Ministry of Education, School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China
    2. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
  • Received:2018-03-22 Revised:2018-06-21 Online:2018-12-20 Published:2018-11-27
  • About author:LIU Can-Jun. E-mail: liucanjun@hnust.edu.cn
  • Supported by:
    National Natural Science Foundation of China (51502088);Hunan Provincial Natural Science Foundation (2017JJ3079);Scientific Research Fund of Hunan Provincial Education Department (17C0628)

Abstract:

CdS/TiO2 heterojunction films have attracted much attention in the field of photocatalysis due to their excellent photocatalytic performance under visible light irradiation. However, the CdS/TiO2 films prepared by the conventional methods may exhibit loose interface, leading to poor transport of photogenerated carriers in the interface. In this study, CdS/TiO2 heterojunction films were successfully prepared by in-situ transformation (TiO2→CdTiO3→CdS). Morphologies and structures of as-prepared films were characterized by XRD, SEM and TEM. Results show that CdS formed on the surface of TiO2 nanoparticle, and the interface of CdS/TiO2 heterojunction was compact. Their photoelectrochemical (PEC) performance was investigated by electrochemical working station.Results indicate that the CdS/TiO2 films prepared by in-situ method, whose photocurrent density was as high as 9.8 mA∙cm-2 at 0.4 V (vs. RHE), present higher PEC activity than those prepared by successive ionic layer adsorption and reaction (SILAR). The electrochemical impedance spectroscopy (EIS) results show that the in-situ synthesized CdS/TiO2 films own lower charge transfer resistance, which reveals that the in-situ formed compact interface can reduce the charge transfer resistance in the CdS/TiO2 interface, restrict the recombination of photo-induced carriers, and further enhance the PEC performance.

Key words: CdS/TiO2, photoelectrochemical performance, in-situ synthesis, photoanode, heterojunction

CLC Number: 

  • O644