Ultrathin FeSe2 nanosheets: Controlled synthesis and application as a heterogeneous catalyst in dye-sensitized solar cells

Shoushuang Huang, Qingquan He, Wenlong Chen, Qiquan Qiao, Jiantao Zai, Xuefeng Qian

Research output: Contribution to journalArticlepeer-review

Abstract

Two-dimensional (2D) semiconducting nanosheets have emerged as an important field of materials, owing to their unique properties and potential applications in areas ranging from electronics to catalysis. However, the controlled synthesis of ultrathin 2D nanosheets remains a great challenge, due to the lack of an intrinsic driving force for anisotropic growth. High-quality ultrathin 2D FeSe2 nanosheets with average thickness below 7 nm have been synthesized on large scale by a facile solution method, and a formation mechanism has been proposed. Due to their favorable structural features, the as-synthesized ultrathin FeSe2 nanosheets exhibit excellent electrocatalytic activity for the reduction of triiodide to iodide and low charge-transfer resistance at the electrolyte-electrode interface in dye-sensitized solar cells (DSSCs). The DSSCs with FeSe2 nanosheets as counter electrode material achieve a high power conversion efficiency of 7.53% under a simulated solar illumination of 100 mWcm-2 (AM 1.5), which is comparable with that of Pt-based devices (7.47 %).

Original languageEnglish (US)
Pages (from-to)4085-4091
Number of pages7
JournalChemistry - A European Journal
Volume21
Issue number10
DOIs
StatePublished - Oct 7 2014
Externally publishedYes

Keywords

  • Electrocatalysis
  • Iron chalcogenides
  • Nanostructures
  • Photoelectrochemistry
  • Solar cells

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

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