Facet-dependent catalytic activity of platinum nanocrystals for triiodide reduction in dye-sensitized solar cells

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Zhang, Bo
Wang, Dong
Hou, Yu
Yang, Shuang
Yang, Xiao Hua
Zhong, Ju Hua
Liu, Jian
Wang, Hai Feng
Hu, P
Zhao, Hui Jun
Yang, Hua Gui
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2013
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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.

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Scientific Reports

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3

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© The Author(s) 2013. This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License, which permits unrestricted, non-commercial use, distribution and reproduction in any medium, providing that the work is properly cited. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/3.0/

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Inorganic green chemistry

Electrochemistry

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