Acta Chimica Sinica ›› 2013, Vol. 71 ›› Issue (03): 421-426.DOI: 10.6023/A12100830 Previous Articles     Next Articles

Article

CdSeTe NSs/TiO2NTs的制备及其光电催化还原CO2的应用

井华, 王祜英, 徐金凤, 睢晓娜, 胡海涛, 李培强, 尹洪宗   

  1. 山东农业大学化学与材料科学学院 泰安 271018
  • 收稿日期:2012-10-27 出版日期:2013-03-14 发布日期:2013-02-01
  • 通讯作者: 李培强,尹洪宗 E-mail:chem_carbon@yahoo.cn,pqli@sdau.edu.cn
  • 基金资助:

    项目受国家青年自然科学基金(No.21203114)及山东省优秀中青年科学家科研奖励基金(No.BS2012NJ008)资助.

CdSeTe NSs/TiO2 NTs Photoelectric Catalytic Reduction of CO2

Jing Hua, Wang Huying, Xu Jinfeng, Sui Xiaona, Hu Haitao, Li Peiqiang, Yin Hongzong   

  1. College of Chemistry and Material Science, Shandong Agricultural University, Tai'an 271018
  • Received:2012-10-27 Online:2013-03-14 Published:2013-02-01
  • Supported by:

    Project supported by the National Natural Science Foundation of China (No. 21203114) and the Promotive Research Fund for Excellent Young and Middle-aged Scientists of Shandong Province (No. BS2012NJ008).

The TiO2 NTs was prepared by means of anodic oxidation method at the applied voltage of 20 V. The electrolyte consisted of 0.8 wt% NH4F, 1.6 wt% NaSO4, and 10 wt% PEG400. After 3 h anodization, it was rinsed with twice-distilled water and dried in a nitrogen stream. And then the amorphous TiO2 NTs were crystallized by annealing in oxygen atmosphere for 1.5 h at 500 ℃ at both heating and cooling rates of 1 ℃·min-1. Subsequently, the TiO2 NTs and CdSeTe precursor solution were placed in teflon-lined stainless reactor at 120 ℃ for 2 h. Then the CdSeTe modified TiO2 NTs were dried at 80 ℃, at last, the modified TiO2 NTs was treated at 500 ℃ for 2 h under nitrogen atmosphere with heating and cooling rate of 2 ℃·min-1. The catalyst of CdSeTe NSs/TiO2 NTs was gained finally. According to the SEM (Scanning electron microscope), TEM (Transmission electron microscopy) and HRTEM (High resolution transmission electron microscopy) testing, it showed that the CdSeTe was sheet morphology and grew on the TiO2 NTs surface parallelly. XRD (X-ray diffraction) characterization revealed that CdSeTe NSs had preferential orientation along the (100) and (002) direction. Measured by UV-vis DRS (Ultraviolet-visible diffuse reflection spectrum), it got the band gap of the as-prepared catalyst material, 1.48 eV. Processing XPS (X-ray photoelectron spectroscopy) data by Linear extrapolation, we got its valence band located at 1.02 eV. So we could deduce that the conduction band minimum (CBM) was located at -0.46 eV. Under light irradiation, the photoelectrocatalytic reduction performance for CO2 had a significant improvement compared with TiO2 NTs, it expressed as the great increase of reduction current density. In the photoelectrocatalytic reduction of CO2 process, methanol was the major product identified by gas chromatography, and the excellent reduction mechanism was explained from the following three aspects: energy band match, electron high transport ability and the stability of catalyst material.

Key words: CdSeTe, TiO2 NTs, PEC reduction, CO2, energy band match