Composition-Dependent Electrocatalytic Activity of Cobalt Sulfides for Triiodide Reduction in Dye-Sensitized Solar Cells
2017
Kim, Min-su | Bang, Jin Ho
A new nanoarchitecture of cobalt sulfide (CoSₓ) is designed by exploiting a Prussian blue analogue. Depending on the sulfidation temperatures, CoSₓ materials with different compositions and morphologies are obtained. This investigation of the composition-dependent electrocatalytic activity of CoSₓ for triiodide reduction reaction (IRR) reveals that sulfur-deficient CoSₓ is more active than sulfur-rich CoSₓ. When utilized in dye-sensitized solar cells (DSSCs), sulfur-deficient CoSₓ with a hollow nanocube morphology outperforms platinum (Pt), showing great promise as a Pt alternative. This composition dependency on IRR is attributed to different surface characteristics and electrical properties that vary with CoSₓ composition. This work highlights the importance of understanding the surface properties of sulfide-based electrocatalysts that are intimately dictated by their compositions as part of a new design principle for a highly active electrocatalyst.
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