1. Highly electrocatalytic hybrid silver nanowire-graphene counter electrode for Co3+/2+ redox mediator based dye-sensitized solar cells
- Author
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Ji-Hoon Lee, Ju-Won Lee, Kyung Jae Lee, Mohammad Al-Mamun, Sung-Ryong Kim, Jae-Yup Kim, Insik In, Young-Hui Ko, and Yung-Eun Sung
- Subjects
Tafel equation ,Auxiliary electrode ,Materials science ,Mechanical Engineering ,Inorganic chemistry ,Metals and Alloys ,Electrolyte ,Condensed Matter Physics ,Electrochemistry ,Electronic, Optical and Magnetic Materials ,Dye-sensitized solar cell ,Mechanics of Materials ,Electrode ,Materials Chemistry ,Cyclic voltammetry ,Polarization (electrochemistry) - Abstract
Solution processed hybrid silver nanowire (AgNW)-graphene nanoplatelets (GNP) films were prepared and the electrocatalytic activity for the cobalt redox electrolyte in dye-sensitized solar cells (DSSCs) was examined. Cyclic voltammograms and Tafel polarization measurements confirmed the superior electrocatalytic activity of AgNW-GNP electrode than that of standard Pt counter electrode (CE). Electrochemical impedance spectroscopic (EIS) study also revealed the lower charge transfer resistance (Rct) of AgNW-GNP compared to Pt based CE. However, the resistance of the electrolyte diffusion was higher for the AgNW-GNP based CE resulted from the porous structure of the hybrid CE. The photoconversion efficiencies of the DSSC prepared with AgNW-GNP based CE was found to be 2.44%, which was comparable to that of Pt based DSSC, 2.55%. This study proposed an alternative low-cost cathode material for the cobalt redox mediator based DSSCs.
- Published
- 2013
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