能源化学(英文版)

能源化学(英文) ›› 2019, Vol. 28 ›› Issue (2): 88-94.DOI: 10.1016/j.jechem.2018.02.017

• Preface • 上一篇    下一篇

Ultrafast laser dynamics of metal organic frameworks/TiO2 nano-arrays hybrid composites for energy conversion applications

Fatma M. Ismaila,b, Daniel O'Neilc, Tareq Youssefa, Souad A. Elfekya   

  1. a The National Institute of Laser Enhanced Sciences, Cairo University, Giza, 12613, Egypt;
    b Zewail City of Science and Technology, Giza, Egypt;
    c Georgia Institute of Technology, Georgia, Atlanta, USA
  • 收稿日期:2017-10-31 修回日期:2018-01-28 出版日期:2019-02-15 发布日期:2019-02-15
  • 通讯作者: Souad A. Elfeky
  • 基金资助:

    This work was funded by the Science and Technology Development Fund in Egypt (STDF), project number 12323.

Ultrafast laser dynamics of metal organic frameworks/TiO2 nano-arrays hybrid composites for energy conversion applications

Fatma M. Ismaila,b, Daniel O'Neilc, Tareq Youssefa, Souad A. Elfekya   

  1. a The National Institute of Laser Enhanced Sciences, Cairo University, Giza, 12613, Egypt;
    b Zewail City of Science and Technology, Giza, Egypt;
    c Georgia Institute of Technology, Georgia, Atlanta, USA
  • Received:2017-10-31 Revised:2018-01-28 Online:2019-02-15 Published:2019-02-15
  • Contact: Souad A. Elfeky
  • Supported by:

    This work was funded by the Science and Technology Development Fund in Egypt (STDF), project number 12323.

摘要： Herein, we report the victorious synthesis of metal-organic frameworks (MOFs) on TiO2 nanotubes (NTs) using a layer-by-layer (LbL) approach. Highly crystalline and homogenous thin films of MOFs were grown and characterized using XRD, SEM, FT-IR and UV/Vis spectroscopy. Moreover, the utilization of the MOF films as sensitizers was probed in bespoke Graetzel type liquid junction solar cells. The constructed cell performance revealed an Isc of 1.16 mA cm-2, Voc of 0.63 V, FF of 0.33, and Eff of 0.42%. Further, pumpprobe transient laser spectroscopy was performed to investigate the energy and charge transfer dynamics of the MOFs/TiO2 NTs interface. The results indicated 86% injection efficiency. The ultrafast pump-probe spectroscopy allows the investigation of this process and the differences between MOFs. It also showed that the relaxation of the MOF chromophores is in competition with electron injection in the TiO2 motif. Thus this study provides a new insight into electron transfer from photoexcited metal-organic frameworks (MOFs) into titanium dioxide.

关键词: Ultrafast laser dynamics, Metal-organic frameworks, TiO2 nano-arrays, Energy conversion, Thin film

Abstract: Herein, we report the victorious synthesis of metal-organic frameworks (MOFs) on TiO2 nanotubes (NTs) using a layer-by-layer (LbL) approach. Highly crystalline and homogenous thin films of MOFs were grown and characterized using XRD, SEM, FT-IR and UV/Vis spectroscopy. Moreover, the utilization of the MOF films as sensitizers was probed in bespoke Graetzel type liquid junction solar cells. The constructed cell performance revealed an Isc of 1.16 mA cm-2, Voc of 0.63 V, FF of 0.33, and Eff of 0.42%. Further, pumpprobe transient laser spectroscopy was performed to investigate the energy and charge transfer dynamics of the MOFs/TiO2 NTs interface. The results indicated 86% injection efficiency. The ultrafast pump-probe spectroscopy allows the investigation of this process and the differences between MOFs. It also showed that the relaxation of the MOF chromophores is in competition with electron injection in the TiO2 motif. Thus this study provides a new insight into electron transfer from photoexcited metal-organic frameworks (MOFs) into titanium dioxide.

Key words: Ultrafast laser dynamics, Metal-organic frameworks, TiO2 nano-arrays, Energy conversion, Thin film