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Journal of Solid State Electrochemistry

, Volume 22, Issue 11, pp 3331–3341 | Cite as

One-step hydrothermal synthesis of marigold flower-like nanostructured MoS2 as a counter electrode for dye-sensitized solar cells

  • R. Senthilkumar
  • S. Ramakrishnan
  • Murali Balu
  • Praveen C. Ramamurthy
  • Duraisamy Kumaresan
  • Nikhil K. Kothurkar
ORIGINAL ARTICLE
  • 136 Downloads

Abstract

MoS2 thin films with marigold flower-like nanostructures were grown on conductive fluorine-doped tin oxide (FTO) substrates through a one-step hydrothermal synthesis for their application as counter electrodes (CEs) in dye-sensitized solar cells (DSSCs). Different MoS2 thin film samples (A–D) were grown on FTO slides using different concentrations of precursors (sodium molybdate and thioacetamide), while keeping the Mo/S molar ratio constant (1:4.6), in all samples. The effect of varying precursor concentrations (3.2–12.6 mM on MoS2 basis) on the structure of the nanostructured thin films and their performance as DSSC-CEs was investigated. Scanning electron microscopy revealed a material with an infolded petal-like morphology. With increasing precursor concentration, the petal-like structures tended to form bunched nanostructures (100–300 nm) resembling marigold flowers. X-ray diffraction analysis, X-ray photoelectron, and Raman spectroscopy studies showed that the thin films were composed of hexagonal MoS2 with good crystallinity. Hall effect measurements revealed MoS2 to be a p-type semiconductor with a carrier mobility of 219.80 cm2 V−1 s−1 at room temperature. The electrochemical properties of the thin films were examined using cyclic voltammetry and electrochemical impedance spectroscopy. The marigold flower-like MoS2 thin films showed excellent electrocatalytic activity towards the I¯/I3¯ reaction and low charge transfer resistance (Rct) values of 14.77 Ω cm−1, which was close to that of Pt electrode (12.30 Ω cm−1). The maximum power conversion efficiency obtained with MoS2 CE-based DSSCs was 6.32%, which was comparable to a Pt CE-based DSSC (6.38%) under one sun illumination. Similarly, the maximum incident photon-to-charge carrier efficiency exhibited by MoS2 CE-based DSSCs was 65.84%, which was also comparable to a Pt CE-based DSSC (68.38%). The study demonstrated that the marigold flower-like nanostructured MoS2 films are a promising alternative to the conventional Pt-based CEs in DSSCs.

Graphical abstract

Keywords

Marigold flower-like MoS2 Dye-sensitized solar cells MoS2 counter electrodes One-step hydrothermal synthesis and counter electrodes 

Notes

Acknowledgments

The authors are grateful to Dr. Murali Rangarajan, CoE AMGT, for providing the facilities of conducting the electrochemical studies, Dr. T.G Satheeshbabu, Biosensor research lab, for providing film thickness measurement, and CoE-AMGT and DST CERI [Grant Number: DST/TM/CERI/D11 (G)] for their financial support for the research.

Supplementary material

10008_2018_4043_MOESM1_ESM.doc (614 kb)
ESM 1 (DOC 613 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Center of Excellence in Advanced Materials and Green Technologies (CoE-AMGT)Amrita School of Engineering, Coimbatore, Amrita Vishwa VidyapeethamCoimbatoreIndia
  2. 2.Department of Chemical Engineering and Materials ScienceAmrita School of Engineering, Coimbatore, Amrita Vishwa VidyapeethamCoimbatoreIndia
  3. 3.Department of Materials EngineeringIndian Institute of ScienceBangaloreIndia

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