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Hierarchical TiO1.1Se0.9-wrapped carbon cloth as the TCO-free and Pt-free counter electrode for iodide-based and cobalt-based dye-sensitized solar cells

Abstract

Titanium oxide-selenide (TiO1.1Se0.9) composite material was successfully obtained on a flexible substrate of carbon cloth (CC); this TiO1.1Se0.9/CC electrode was used as the counter electrode (CE) in a dye-sensitized solar cell (DSSC). Each carbon fiber in the CC was wrapped with a composite layer of TiO1.1Se0.9, and the composite layer contained TiO1.1Se0.9 nanospheres and one-dimensional (1D) nanorods. Thus, each carbon fiber with its TiO1.1Se0.9 layer has a hierarchical core-shell structure, in which the carbon fiber acts as a one-dimensional conductive core for electron transfer and the TiO1.1Se0.9 layer around the fiber functions as an electro-catalytic shell. In iodide-based electrolyte, the DSSC with the TiO1.1Se0.9/CC exhibits a power conversion efficiency (η) of 9.47%, which is higher than the cells with the CEs of Pt/CC (7.75%) and the pristine TiO2/CC (4.90%). At dim light condition, the best TiO1.1Se0.9/CC electrode rendered its cell 10.00% at 0.5 sun and the best η of 10.39% at 0.1 sun. In cobalt-based electrolyte, the DSSC with the TiO1.1Se0.9/CC shows an attractive η of 10.32% at 1.0 sun, the best η of 10.47% at 0.5 sun, and an impressive η of 10.20% at 0.1 sun. The earth abundant and low-cost TiO1.1Se0.9 is a promising alternative to Pt for the CE of a DSSC in both iodide and cobalt electrolytes.

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Publication details

The article was received on 21 Mar 2017, accepted on 12 Jun 2017 and first published on 13 Jun 2017


Article type: Paper
DOI: 10.1039/C7TA02474F
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Hierarchical TiO1.1Se0.9-wrapped carbon cloth as the TCO-free and Pt-free counter electrode for iodide-based and cobalt-based dye-sensitized solar cells

    C. Li, C. Lee, I. Chiu, V. Ramamurthy, Y. Huang, T. Chen, H. Pang, J. T. Lin and K. Ho, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA02474F

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