4.6 Article

Cobalt telluride/reduced graphene oxide using as high performance counter electrode for dye-sensitized solar cells

Journal

ELECTROCHIMICA ACTA
Volume 185, Issue -, Pages 184-189

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2015.10.150

Keywords

dye-sensitized solar cell; counter electrode; cobalt telluride; reduced graphene oxide

Funding

  1. National Natural Science Foundation of China [91422301, 51472094, 61474047, 21301060, 61306077, U1205112]

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A cobalt telluride/reduced graphene oxide (CoTe/RGO) hybrid is synthesized by hydrothermal method and used as counter electrode in dye-sensitized solar cell (DSSC). The synthesized samples are characterized by field emission scanning electron microscopy and transmission electron microscope, which shows that CoTe/RGO has a larger specific surface area than CoTe. Cyclic voltammogram measurement indicates that CoTe/RGO electrode has larger current density and better electrocatalytic activity in the reduction of triiodidie than Pt electrode. Electrochemical impedance spectroscopy shows that CoTe/RGO electrode has lower charge-transfer resistance (2.94 V cm(2)). Owing to above advantages, the DSSC based on CoTe/RGO counter electrode achieves a high power conversion efficiency of 9.17%, outperforming that based on Pt counter electrode (8.17%). Therefore, inexpensive CoTe/RGO is a promising counter electrode to replace noble metal Pt. (C) 2015 Elsevier Ltd. All rights reserved.

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