Facet-Dependent Catalytic Activity of Platinum Nanocrystals for Triiodide Reduction in Dye-Sensitized Solar Cells

Bo Zhang, Dong Wang, Yu Hou, Shuang Yang, Xiao Hua Yang, Ju Hua Zhong, Jian Liu, Hai Feng Wang, P. Hu, Hui Jun Zhao, Hua Gui Yang*

*Corresponding author for this work

Research output: Contribution to journalArticle

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Abstract

Platinum (Pt) nanocrystals have demonstrated to be an effective catalyst in many heterogeneous catalytic processes. However, pioneer facets with highest activity have been reported differently for various reaction systems. Although Pt has been the most important counter electrode material for dye-sensitized solar cells (DSCs), suitable atomic arrangement on the exposed crystal facet of Pt for triiodide reduction is still inexplicable. Using density functional theory, we have investigated the catalytic reaction processes of triiodide reduction over {100}, {111} and {411} facets, indicating that the activity follows the order of Pt(111) > Pt(411) > Pt(100). Further, Pt nanocrystals mainly bounded by {100}, {111} and {411} facets were synthesized and used as counter electrode materials for DSCs. The highest photovoltaic conversion efficiency of Pt(111) in DSCs confirms the predictions of the theoretical study. These findings have deepened the understanding of the mechanism of triiodide reduction at Pt surfaces and further screened the best facet for DSCs successfully.
Original languageEnglish
Article number1836
Number of pages7
JournalScientific Reports
Volume3
DOIs
Publication statusPublished - 14 May 2013

Keywords

  • ELECTRON-TRANSFER REACTION
  • EFFICIENT COUNTER ELECTRODE
  • HIGH-INDEX FACETS
  • LOW-COST
  • NANOPARTICLE SHAPE
  • COLLOIDAL SOLUTION
  • CARBON NANOTUBES
  • SINGLE-CRYSTAL
  • SURFACE-AREA
  • NANOCATALYSIS

Cite this

Zhang, B., Wang, D., Hou, Y., Yang, S., Yang, X. H., Zhong, J. H., Liu, J., Wang, H. F., Hu, P., Zhao, H. J., & Yang, H. G. (2013). Facet-Dependent Catalytic Activity of Platinum Nanocrystals for Triiodide Reduction in Dye-Sensitized Solar Cells. Scientific Reports, 3, [1836]. https://doi.org/10.1038/srep01836