Fe1-xCoxS2 Solid Solutions with Tunable Energy Structures to Enhance the Performance of Triiodide Reduction in Dye-Sensitized Solar Cells

Dui Ma, Jiantao Zai, Yan Wang, Qiquan Qiao, Xuefeng Qian

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

The electrocatalytic performances of semiconductors are closely correlated to their energy structures, and solid solutions can continuously tune the energy structures by controlling their composition. Herein, a series of Fe1-xCoxS2 (x=0–0.5) solid solutions have been synthesized and served as counter electrodes in dye-sensitized solar cells (DSSCs). The Fermi level of Fe1-xCoxS2 solid solutions shifted negatively as the x value changed from 0 to 0.5, and the electrocatalytic performance for I3 reduction gradually enhanced due to the facilitated electron transfer process from electrode to I3 . Benefitting from its negative Fermi level, Fe0.5Co0.5S2 exhibited the smallest charge transfer resistance (Rct) and remarkable electrocatalytic properties. The DSSCs using Fe0.5Co0.5S2 as a counter electrode achieve the lowest Rct (0.84 Ω cm2) and the highest power conversion efficiency (η=8.36%) of these solid solution materials.

Original languageEnglish (US)
Pages (from-to)1043-1047
Number of pages5
JournalChemNanoMat
Volume4
Issue number10
DOIs
StatePublished - Oct 2018
Externally publishedYes

Keywords

  • dye-sensitized solar cells
  • electrocatalysts
  • energy structures
  • iron pyrite
  • solid solutions

ASJC Scopus subject areas

  • Biomaterials
  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Materials Chemistry

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