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Preparation of rGO/ZnO photoanodes and their DSSCs performance

Authors
  • Li, Jiake
  • Wu, Lanxiang
  • Li, Wentao
  • Chen, Ying
  • Liu, Xin
  • Jiang, Hedong
  • Guo, Pingchun
  • Zhu, Hua
  • Wang, Yanxiang
Type
Published Article
Journal
Materials Science-Poland
Publisher
Sciendo
Publication Date
Sep 07, 2022
Volume
40
Issue
2
Pages
170–180
Identifiers
DOI: 10.2478/msp-2022-0019
Source
De Gruyter
Keywords
License
Green

Abstract

In this study, we report a mild and controllable preparation method for graphene oxide (GO) and ZnO ultrafine powder, respectively. On this basis, reduced graphene oxide (rGO)/ZnO composite powder for the photoanodes of dye-sensitized solar cells (DSSCs) was synthesized by chemical reduction method. Phase composition, microstructure, chemical structure, conductivity, and specific surface area were examined using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FT-IR), Raman, and Brunauer-Emmett-Teller (BET) method, respectively. Photoelectric performance of DSSCs was studied by the current density-voltage (J-V), electrochemical impedance spectra (EIS) photoelectric test system. As rGO possesses higher adsorption capacity and excellent conductivity, hence it may effectively promote separation of electrons and holes, transmission ability of electrons and holes, and utilization of the light. By contrast, the as-synthesized zinc oxide (ZnO) may increase adsorption capacity of dye molecules, so photoelectric conversion efficiency (PCE) of the solar cells is increased by means of synergistic effects. When adding rGO in the rGO/ZnO composite powder at 1.25 wt%, PCE reaches to 6.27%, an increase of 20.6% more than that of pure ZnO as the photoanode.

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