MnCo2S4/CoS2 Electrode for Ultrahigh Areal Capacitance
0
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
MnCo2S4/CoS2 electrode with highly accessible electroactive sites is prepared using the hydrothermal method. The electrode exhibits an areal capacitance of 0.75Fcm-2 at 6mAcm-2 in 1 M KOH. The capacitance is further increased to 2.06 Fcm-2 by adding K3Fe(CN)6and 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 10mAcm-2 in a composite electrolyte system of KOH and ferri/ferrocyanide. The capacitance enhancement is supported by the lowest equivalent series resistance (0.62Ωcm-2) of MnCo2S4/CoS2 in the presence of redox additive couple compared with the bare KOH electrolyte.
Abstract
MnCo2S4/CoS2 electrode with highly accessible electroactive sites is prepared using the hydrothermal method. The electrode exhibits an areal capacitance of 0.75Fcm-2 at 6mAcm-2 in 1 M KOH. The capacitance is further increased to 2.06 Fcm-2 by adding K3Fe(CN)6and 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 10mAcm-2 in a composite electrolyte system of KOH and ferri/ferrocyanide. The capacitance enhancement is supported by the lowest equivalent series resistance (0.62Ωcm-2) of MnCo2S4/CoS2 in the presence of redox additive couple compared with the bare KOH electrolyte.
참고문헌 (13)
- T. Zhao, "Surfactant-assisted electrochemical deposition of a cobalt hydroxide for supercapacitors", J. Power Sources, 196(2), pp.860~864 (2011)
- M. Huang, "MnO2-based nanostructures for high-performance supercapacitors", J. Mater. Chem. A, 3(43), pp.21380~21423 (2015)
- R. B. Pujari, "Hexagonal microrods architectured MoO3 thin film for supercapacitor application", J. Mater. Sci. : Mater. Electron, 27(4), pp.3312~3317 (2016)
- Y. Ji, "A facile template-free approach for the solid-phase synthesis of CoS2 nanocrystals and their enhanced storage energy in supercapacitors", RSC Adv, 4(19), pp.50220~50225 (2014)
- W. Kong, "Homogeneous core-shell NiCo2S4 nanostructures supported on nickel foam for supercapacitors", J. Mater. Chem. A, 3(23), pp.12452~12460 (2015)
- Y. Liang, "Zn0. 76Co0. 24S", CoS2 nanowires array for efficient electrochemical splitting of water, 2016, pp.190(1), 360~364
- Q. Wang, "Facile synthesis of novel CuCo2S4 nanospheres for coaxial fiber supercapacitors", RSC Adv, 7(48), pp.29933~29937 (2017)
- A. M. Elshahawy, "Controllable MnCo2S4 nanostructures for high performance hybrid supercapacitors", J. Mater. Chem. A, 5(16), pp.7494~7506 (2017)
- Y. M. Chen, "General formation of MxCo3-xS4(M = Ni, Mn, Zn)hollow tubular structures for hybrid supercapacitors", Angew. Chem. In. Ed, 54(36), pp.10521~10524 (2015)
- K. Chen, "Carbon with ultrahigh capacitance when graphene paper meets K3Fe(CN)6", Nanoscale, 7(7), pp.432~439 (2015)
- S. T. Senthilkumar, "Redox additive", active electrolytes : a novel approach to enhance the performance of supercapacitors, 2013, pp.1(40), 12386~12394
- C. Zhao, "Ultrahigh capacitive performance from both Co(OH)2", graphene electrode and K3Fe(CN)6 electrolyte, 2013, pp.3, 2986(1)~2986(6)
- S. Liu, "Hierarchical manganese cobalt sulfide core-shell nanostructures for high-performance asymmetric supercapacitors", J. Power Sources, 342(28), pp.629~637 (2017)