Graphene Oxide Sponge as Nanofillers in Printable Electrolytes in High-Performance Quasi-Solid-State Dye-Sensitized Solar Cells

Shanmuganathan Venkatesan, Elmer Surya Darlim, Ming Hsiang Tsai, Hsisheng Teng, Yuh Lang Lee

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

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 (Rpt) and increases the recombination resistance at the photoelectrode/electrolyte interface (Rct). 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 (Voc) and fill factor with a slight decrease in current density (Jsc). The cell efficiency can retain 86% of its initial value after a 500 h stability test at 60 °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.

Original languageEnglish
Pages (from-to)10955-10964
Number of pages10
JournalACS Applied Materials and Interfaces
Volume10
Issue number13
DOIs
Publication statusPublished - 2018 Apr 4

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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