Asymmetric supercapacitor device performance based on microwave synthesis of N-doped graphene/nickel sulfide nanocomposite
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Nickel sulfide (NiS) and Nitrogen-doped Graphene/NiS nanocomposite (NG/NiS) are prepared via green microwave synthesis route as electrode materials for supercapacitors. As-prepared materials are examined using XRD, Raman, XPS, SEM, EDX and elemental mapping characterization techniques to obtain the information regarding their structure, complex formation, morphology and elemental presence. The electrochemical investigations like CV, GCD and impedance analysis suggest that NG/NiS is an excellent electrode material with a specific capacitance of 1467.8 F g−1 at 1 A g−1. In asymmetric configuration of NG//NG/NiS, with polyurethane foam as the separator soaked with 6 M KOH and graphite sheet as the current collector, the composite produces the energy density of 66.6 Wh kg−1 at a power density of 405.83 W kg−1 with a cyclic stability of 86.6% for 5000 cycles. The high electrochemical performance is because N-doped graphene houses NiS nanoflake clusters, and together they demonstrate an impressive performance for supercapacitors.
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Conflict of interest
The authors hereby declare that there is no conflict of interest.
- 6.Sun L, Wang L, Tian CG, Tan TX, Xie Y, Shi KY, Li MT, Fu HG (2012) Nitrogen-doped graphene with high nitrogen level via a one-step hydrothermal reaction of graphene oxide with urea for superior capacitive energy storage. RSC Adv 12:4498–4506. https://doi.org/10.1039/c2ra01367c CrossRefGoogle Scholar
- 7.Liu C, Zhang L, Liu R, Gao Z, Yang X, Tu Z, Yang F, Ye Z, Cui L, Xu C, Li Y (2016) Hydrothermal synthesis of N-doped TiO2 nanowires and N-doped graphene heterostructures with enhanced photocatalytic properties. J Alloys Compd 656:24–32. https://doi.org/10.1016/j.jallcom.2015.09.211 CrossRefGoogle Scholar
- 9.Cheng CK, Lin CH, Wu HC, Ma CCM, Yeh TK, Chou HY, Tsai CH, Hsieh CK (2016) The Two-dimensional nanocomposite of molybdenum disulfide and nitrogen-doped graphene oxide for efficient counter electrode of dye-sensitized solar cells. Nanoscale Res Lett 11:117–125. https://doi.org/10.1186/s11671-016-1277-0 CrossRefGoogle Scholar
- 17.Son MY, Choi JH, Kang YC (2014) Electrochemical properties of bare nickel sulfide and nickel sulfide-carbon composites prepared by one-pot spray pyrolysis as anode materials for lithium secondary batteries. J Power Sour 251:480–487. https://doi.org/10.1016/j.jpowsour.2013.10.093 CrossRefGoogle Scholar
- 26.Xing Z, Chu Q, Ren X, Tian J, Asiri AM, Alamry KA, Al-Youbi AO, Sun X (2013) Biomolecule-assisted synthesis of nickel sulfides/reduced graphene oxide nanocomposites as electrode materials for supercapacitors. Electrochem Commun 32:9–13. https://doi.org/10.1016/j.elecom.2013.03.033 CrossRefGoogle Scholar
- 29.Zhou W, Cao X, Zheng Z, Shi W, Zhu Y, Yan Q, Liu H, Wang J, Zhang H (2013) One-step synthesis of Ni3S2 nanorod@Ni(OH)2 nanosheet core–shell nanostructures on a three-dimensional graphene network for high-performance supercapacitors. Energy Environ Sci 6:2216–2221. https://doi.org/10.1039/c3ee40155c CrossRefGoogle Scholar
- 35.Peng L, Ji X, Wan H, Ruan Y, Xu K, Chen C, Miao L, Jiang J (2015) Nickel sulfide nanoparticles synthesized by microwave-assisted method as promising supercapacitor electrodes: an experimental and computational study. Electrochim Acta 182:361–367. https://doi.org/10.1016/j.electacta.2015.09.024 CrossRefGoogle Scholar
- 37.Chen YL, Hu ZA, Chang YQ, Wang HW, Zhang ZY, Yang YY, Wu HY (2011) Zinc oxide/reduced graphene oxide composites and electrochemical capacitance enhanced by homogeneous incorporation of reduced graphene oxide sheets in zinc oxide matrix. J Phys Chem C 115:2563–2571. https://doi.org/10.1021/jp109597n CrossRefGoogle Scholar
- 41.Sudhakar S, Joshi DN, Peera SG, Sahu SK, Eggleston CM, Prasath RA (2018) Hydrothermal-microwave synthesis of cobalt oxide incorporated nitrogen-doped graphene composite as an efficient catalyst for oxygen reduction reaction in alkaline medium. J Mater Sci Mater Electron 29:6750–6762. https://doi.org/10.1007/s10854-018-8661-8 CrossRefGoogle Scholar
- 46.Xie LJ, Wu JF, Chen CM, Zhang CM, Wan L, Wang JL, Kong QQ, Lv CX, Li KX, Sun GH (2013) A novel asymmetric supercapacitor with an activated carbon cathode and a reduced graphene oxide–cobalt oxide nanocomposite anode. J Power Sour 242:148–156. https://doi.org/10.1016/j.jpowsour.2013.05.081 CrossRefGoogle Scholar