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

2 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

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Microspheres
Capacitors
Energy storage
Electrodes
Capacitance
Hybrid materials
Iron
Graphite
Pyrites
Oxides
Graphene
Transition metals
Minerals
Earth (planet)
Ions
Electrons
Supercapacitor
pyrite

Keywords

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

ASJC Scopus subject areas

  • Chemical Engineering(all)

Cite this

Facile synthesis of pristine FeS2 microflowers and hybrid rGO-FeS2 microsphere electrode materials for high performance symmetric capacitors. / Balakrishnan, Balamuralitharan; Balasingam, Suresh Kannan; Sivalingam Nallathambi, Karthick; Ramadoss, Ananthakumar; Kundu, Manab; Bak, Jin Soo; Cho, In Ho; Kandasamy, Prabakar; Jun, Yongseok; Kim, Hee Je.

In: Journal of Industrial and Engineering Chemistry, Vol. 71, 25.03.2019, p. 191-200.

Research output: Contribution to journalArticle

Balakrishnan, B, Balasingam, SK, Sivalingam Nallathambi, K, Ramadoss, A, Kundu, M, Bak, JS, Cho, IH, Kandasamy, P, Jun, Y & Kim, HJ 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, vol. 71, pp. 191-200. https://doi.org/10.1016/j.jiec.2018.11.022
Balakrishnan, Balamuralitharan ; Balasingam, Suresh Kannan ; Sivalingam Nallathambi, Karthick ; Ramadoss, Ananthakumar ; Kundu, Manab ; Bak, Jin Soo ; Cho, In Ho ; Kandasamy, Prabakar ; Jun, Yongseok ; Kim, Hee Je. / Facile synthesis of pristine FeS2 microflowers and hybrid rGO-FeS2 microsphere electrode materials for high performance symmetric capacitors. In: Journal of Industrial and Engineering Chemistry. 2019 ; Vol. 71. pp. 191-200.
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AU - Balakrishnan, Balamuralitharan

AU - Balasingam, Suresh Kannan

AU - Sivalingam Nallathambi, Karthick

AU - Ramadoss, Ananthakumar

AU - Kundu, Manab

AU - Bak, Jin Soo

AU - Cho, In Ho

AU - Kandasamy, Prabakar

AU - Jun, Yongseok

AU - Kim, Hee Je

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AB - 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.

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