Effect of graphene nanoplatelet thickness on electrochemical performance of dye-sensitized solar cell

Jiawei Gong, K. Sumathy, Zhengping Zhou, Qiquan Qiao

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

Graphene nanoplatelets were activated by a hydrothermal method using potassium hydroxide (KOH) as an activating agent. The activation process significantly increases the sample specific surface area from 2.4 m2/g to 48 m2/g. The activated graphene nanoplatelets (aGNP) were used as counter electrode (CE) in dye-sensitized solar cells (DSSCs). DSSCs fabricated using aGNP as counter electrodes were tested under standard AM 1.5 illumination with an intensity of 91.5 mW/cm2. The optimized device achieved an overall power conversion efficiency of 7.7%, which is comparable to the conventional platinum counter electrode (8%). The device efficiency (η) and short-circuit current density (Jsc) are dependent on the thickness which is in turn proportional to the surface area, indicating that the surface area could be a dominating factor that dictates the device performance. In addition, it was found that the performance of DSSC is sensitive to the thickness of aGNP thickness. Electrochemical impedance spectroscopy (EIS) indicated that aGNP possessed excellent electrocatalytic activity for triiodide reduction at the interface between electrolyte and counter electrode. This suggests that the aGNP is a promising, cost effective counter electrode material with similar efficiency to Pt counter electrode for the DSSC application.

Original languageEnglish (US)
Title of host publication2016 IEEE International Conference on Electro Information Technology, EIT 2016
PublisherIEEE Computer Society
Pages297-301
Number of pages5
ISBN (Electronic)9781467399852
DOIs
StatePublished - Aug 5 2016
Event2016 IEEE International Conference on Electro Information Technology, EIT 2016 - Grand Forks, United States
Duration: May 19 2016May 21 2016

Publication series

NameIEEE International Conference on Electro Information Technology
Volume2016-August
ISSN (Print)2154-0357
ISSN (Electronic)2154-0373

Conference

Conference2016 IEEE International Conference on Electro Information Technology, EIT 2016
CountryUnited States
CityGrand Forks
Period5/19/165/21/16

All Science Journal Classification (ASJC) codes

  • Computer Science Applications
  • Information Systems
  • Control and Systems Engineering
  • Electrical and Electronic Engineering

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