Facile synthesis of pristine FeS2 microflowers and hybrid rGO-FeS2 microsphere electrode materials for high performance symmetric capacitors

Balamuralitharan Balakrishnan, Suresh Kannan Balasingam, Karthick Sivalingam Nallathambi, Ananthakumar Ramadoss, Manab Kundu, Jin Soo Bak, In Ho Cho, Prabakar Kandasamy, Yongseok Jun, Hee Je Kim

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Iron pyrite (FeS2) is an interesting mineral in the transition metal dichalcogenide group due to its high abundance in the earth's crust which can be used for various electrochemical energy storage applications, such as batteries and supercapacitors; however, it suffers from low rate capability and poor cycle performance, which hampers its use from large-scale commercial applications. In the present study, iron disulfide microspheres anchored onto a reduced graphene oxide matrix (rGO-FeS2 hybrid) were grown using a superficial hydrothermal method. For comparison, rGO-free iron disulfide material was synthesized under the same hydrothermal conditions, and uniformly distributed FeS2 micro-size flowers were formed. The energy storage capacity of both electroactive materials (FeS2 and rGO-FeS2 hybrid material) was tested for supercapacitor applications in a symmetric cell configuration. The pristine FeS2 microflower electrode exhibited an areal capacitance of 70.98 mF cm−2 at 5 mV s−1. On the other hand, the rGO-FeS2 hybrid microsphere electrode exhibited an enhanced areal capacitance of 112.41 mF cm−2 at the same scan rate with an excellent capacitance retention of 90% over 10,000 cycles. The improved electrochemical performance of the rGO-FeS2 hybrid material is due mainly to its improved electrical conductivity, high surface area indicating an enhanced electron, and ion transfer mechanism. This study suggests that the rGO-FeS2 hybrid electrode material has potential applications in energy storage devices.

Original languageEnglish
Pages (from-to)191-200
Number of pages10
JournalJournal of Industrial and Engineering Chemistry
Volume71
DOIs
Publication statusPublished - 2019 Mar 25
Externally publishedYes

Keywords

  • Areal capacitance
  • Electrochemical energy storage
  • Hydrothermal method
  • rGO-FeS
  • Supercapacitors

ASJC Scopus subject areas

  • Chemical Engineering(all)

Fingerprint Dive into the research topics of 'Facile synthesis of pristine FeS<sub>2</sub> microflowers and hybrid rGO-FeS<sub>2</sub> microsphere electrode materials for high performance symmetric capacitors'. Together they form a unique fingerprint.

  • Cite this

    Balakrishnan, B., Balasingam, S. K., Sivalingam Nallathambi, K., Ramadoss, A., Kundu, M., Bak, J. S., Cho, I. H., Kandasamy, P., Jun, Y., & Kim, H. J. (2019). Facile synthesis of pristine FeS2 microflowers and hybrid rGO-FeS2 microsphere electrode materials for high performance symmetric capacitors. Journal of Industrial and Engineering Chemistry, 71, 191-200. https://doi.org/10.1016/j.jiec.2018.11.022