• 文献标题:   Graphene Oxide Sponge as Nanofillers in Printable Electrolytes in High-Performance Quasi-Solid-State Dye-Sensitized Solar Cells
  • 文献类型:   Article
  • 作  者:   VENKATESAN S, DARLIM ES, TSAI MH, TENG H, LEE YL
  • 作者关键词:   graphene oxide sponge, poly ethylene oxide, poly vinylidene fluoride, printable electrolyte, dyesensitized solar cell
  • 出版物名称:   ACS APPLIED MATERIALS INTERFACES
  • ISSN:   1944-8244
  • 通讯作者地址:   Natl Cheng Kung Univ
  • 被引频次:   5
  • DOI:   10.1021/acsami.8b01098
  • 出版年:   2018

▎ 摘  要

A graphene oxide sponge (GOS) is utilized for the first time as a nanofiller (NF) in printable electrolytes (PEs) based on poly(ethylene oxide) and poly(vinylidene fluoride) for quasi-solid-state dye-sensitized solar cells (QS-DSSCs). The effects of the various concentrations of GOS NFs on the ion diffusivity and conductivity of electrolytes and the performance of the QS-DSSCs are studied. The results show that the presence of GOS NFs significantly increases the diffusivity and conductivity of the PEs. The introduction of 1.5 wt % of GOS NFs decreases the charge-transfer resistance at the Pt-counter electrode/electrolyte interface (R-pt) and increases the recombination resistance at the photoelectrode/electrolyte interface (R-ct). QS-DSSC utilizing 1.5 wt % GOS NFs can achieve an energy conversion efficiency (8.78%) higher than that found for their liquid counterpart and other reported polymer gel electrolytes/GO NFs based DSSCs. The high energy conversion efficiency is a consequence of the increase in both the open-circuit potential (V-oc) and fill factor with a slight decrease in current density (J(sc)). The cell efficiency can retain 86% of its initial value after a 500 h stability test at 60 degrees C under dark conditions. The long-term stability of the QS-DSSC with GOS NFs is higher than that without NFs. This result indicates that the GOS NFs do not cause dye-desorption from the photoanode in a long-term stability test, which infers a superior performance of GOS NFs as compared to TiO2 NFs in terms of increasing the efficiency and long-term stability of QS-DSSCs.