Evaluation of counter electrodes composed by carbon nanofibers and nanoparticles in dye-sensitized solar cells

Amit Thapa, Yong Zhao, Prashant Poudel, Hytham Elbohy, Bjorn Vaagensmith, Zhiling Zhang, Hao Fong, Qiquan Qiao

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

A series of counter electrodes (CEs) for dye-sensitized solar cells (DSSCs) was fabricated using different weight ratios of electrospun carbon nanofibers (ECNs) and carbon nanoparticles (CNPs). The conductivity of neat ECN was 838 S/m, which is more than twice than that of neat CNP, and the bulk resistance of CEs decreased as the ECN ratios increased in the composite, leading to lower transport resistance in the CEs. However, as the concentration of CNPs increased, the surface area of CEs also improved because CNPs have a much smaller dimension than ECNs, leading to higher electrocatalytic property. The CEs with higher ratio of CNPs possessed several superiorities compared with those with higher ratio ECNs, such as larger surface area for triiodide reduction, faster reaction rate, and less charge transfer resistance at the interface of CE and electrolyte. Evidenced from cyclic voltammograms and electrochemical impedance spectroscopy, the devices with higher ratio CNPs exhibited lower Nernst diffusion impedance and higher efficiency electrocatalytic performance than those with higher ratio ECNs. When the materials of CE switched from neat ECN to those with a higher concentration of CNPs, the DSSC fill factor, current density, and efficiency were improved.

Original languageEnglish (US)
Article number6637059
Pages (from-to)3883-3887
Number of pages5
JournalIEEE Transactions on Electron Devices
Volume60
Issue number11
DOIs
StatePublished - 2013
Externally publishedYes

Keywords

  • Carbon nanofibers
  • carbon nanoparticles (CNPs)
  • counter electrode (CE)
  • dye-sensitized solar cells (DSSCs)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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