Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
권호 표지
DOI QR코드

DOI QR Code

MnCo2S4/CoS2 Electrode for Ultrahigh Areal Capacitance

  • Pujari, Rahul B. (MEMS and Nanotechnology Laboratory, School of Mechanical System Engineering, Chonnam National University) ;
  • Lokhande, C.D. (Centre for Interdisciplinary Research, D.Y. Patil Education Society (Deemed to be University)) ;
  • Lee, Dong-Weon (MEMS and Nanotechnology Laboratory, School of Mechanical System Engineering, Chonnam National University)
  • Received : 2020.05.27
  • Accepted : 2020.07.29
  • Published : 2020.07.31
Download PDF
⟨ Previous Next ⟩

Abstract

MnCo2S4/CoS2 electrode with highly accessible electroactive sites is prepared using the hydrothermal method. The electrode exhibits an areal capacitance of 0.75 Fcm-2 at 6 mAcm-2 in 1 M KOH. The capacitance is further increased to 2.06 Fcm-2 by adding K3Fe(CN)6 and K4Fe(CN)6 (a redox couple) to KOH. This increment is associated with the redox-active properties of cobalt and manganese transition metals, as well as the ion pair of [Fe(CN)6]-3/[Fe(CN)6]-4. The capacitance retention of the MnCo2S4/CoS2 electrode is 87.5% for successive 4000 charge-discharge cycles at 10 mAcm-2 in a composite electrolyte system of KOH and ferri/ferrocyanide. The capacitance enhancement is supported by the lowest equivalent series resistance (0.62 Ωcm-2) of MnCo2S4/CoS2 in the presence of redox additive couple compared with the bare KOH electrolyte.

Keywords

References

  1. T. Zhao, H. Jiang, and J. Ma, "Surfactant-assisted electrochemical deposition of a cobalt hydroxide for supercapacitors", J. Power Sources, Vol. 196, No. 2, pp. 860-864, 2011. https://doi.org/10.1016/j.jpowsour.2010.06.042
  2. M. Huang, F. Li, F. Dong, Y. X. Zhang, and L. L. Zhang, "MnO2-based nanostructures for high-performance supercapacitors", J. Mater. Chem. A, Vol. 3, No. 43, pp. 21380-21423, 2015. https://doi.org/10.1039/C5TA05523G
  3. R. B. Pujari, V. C. Lokhande, V. S. Kumbhar, N. R. Chodankar and C. D. Lokhande, "Hexagonal microrods architectured MoO3 thin film for supercapacitor application", J. Mater. Sci.: Mater. Electron., Vol. 27, No. 4, pp. 3312-3317, 2016. https://doi.org/10.1007/s10854-015-4160-3
  4. Y. Ji, X, Liu, W. Liu, Y. Wang, H. Zhang, M. Yang, X. Wang, X. Zhao, and S. Feng, "A facile template-free approach for the solid-phase synthesis of CoS2 nanocrystals and their enhanced storage energy in supercapacitors", RSC Adv., Vol. 4, No. 19, pp. 50220-50225, 2014. https://doi.org/10.1039/C4RA08614G
  5. W. Kong, C. Lu, W. Zhang, J. Pu, and Z. Wang, "Homogeneous core-shell NiCo2S4 nanostructures supported on nickel foam for supercapacitors", J. Mater. Chem. A, Vol. 3, No. 23, pp. 12452-12460, 2015. https://doi.org/10.1039/C5TA02432C
  6. Y. Liang, Q. Liu, Y. Luo, X. Sun, Y. He, and A. M. Asiri, "Zn0.76Co0.24S/CoS2 nanowires array for efficient electrochemical splitting of water", Electrochim. Acta, Vol. 190, No. 1, pp. 360-364, 2016. https://doi.org/10.1016/j.electacta.2015.12.153
  7. Q. Wang, X. Liang, D. Yang, and D. Zhang, "Facile synthesis of novel CuCo2S4 nanospheres for coaxial fiber supercapacitors", RSC Adv., Vol. 7, No. 48, pp. 29933-29937, 2017. https://doi.org/10.1039/C7RA04532H
  8. A. M. Elshahawy, X. Li, H. Zhang, Y. Hu, K. H. Ho, C. Guan and J. Wang, "Controllable MnCo2S4 nanostructures for high performance hybrid supercapacitors", J. Mater. Chem. A, Vol. 5, No. 16, pp. 7494-7506, 2017. https://doi.org/10.1039/C7TA00943G
  9. Y. M. Chen, Z. Li, and X. W. Lou, "General formation of MxCo3-xS4 (M = Ni, Mn, Zn) hollow tubular structures for hybrid supercapacitors", Angew. Chem. In. Ed., Vol. 54, No. 36, pp. 10521-10524, 2015. https://doi.org/10.1002/anie.201504349
  10. K. Chen, F. Liu, D. Xue, and S. Komarneni, "Carbon with ultrahigh capacitance when graphene paper meets K3Fe(CN)6", Nanoscale, Vol. 7, No. 7, pp. 432-439, 2015. https://doi.org/10.1039/C4NR05919K
  11. S. T. Senthilkumar, R. K. Selvan, and J. S. Melo, "Redox additive/active electrolytes: a novel approach to enhance the performance of supercapacitors", J. Mater. Chem. A, Vol. 1, No. 40, pp. 12386-12394, 2013. https://doi.org/10.1039/c3ta11959a
  12. C. Zhao, W. Zheng, X. Wang, H. Zhang, X. Cui, and H. Wang, "Ultrahigh capacitive performance from both Co(OH)2/graphene electrode and K3Fe(CN)6 electrolyte", Sci. Rep., Vol. 3, pp. 2986(1)-2986(6), 2013.
  13. S. Liu and S. C. Jun, "Hierarchical manganese cobalt sulfide core-shell nanostructures for high-performance asymmetric supercapacitors", J. Power Sources, Vol. 342, No. 28, pp. 629-637, 2017. https://doi.org/10.1016/j.jpowsour.2016.12.057