Preparation and electrochemical performances of NiS with PEDOT:PSS chrysanthemum petal like nanostructure for high performance supercapacitors

• Published in: Electrochimica acta 2017-11, Vol.254, p.269-279
• Main Authors: S., Srinivasa Rao, Punnoose, Dinah, Bae, Jin-Ho, Durga, Ikkurthi Kanaka, Thulasi-Varma, Chebrolu Venkata, Naresh, Bandari, Subramanian, Archana, Raman, Vivekanandan, Kim, Hee-Je
• Format: Article
• Language: English
• Subjects: Charge transfer; Chrysanthemum petals; Conductivity; Cycles; Electrical resistivity; Electrodes; Electron transfer; Energy storage; Flux density; Metal foams; Nanoparticles; Nanostructure; Nanostructured materials; Nickel foam; NiS/PEDOT:PSS with DEG; Structural stability; Supercapacitor; Supercapacitors; Surface stability; Thin films
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2017.09.134

[Display omitted] •NiS/PEDOT:PSS with DEG chrysanthemum petals were prepared using a facile bar-coating method.•NiS/PEDOT:PSS with DEG showed greater electrochemical properties.•Improved penetration of electrolyte ions into the electrode was observed by the attachment PEDOT:PSS on NiS.•The electrode exhibited a high specific capacitance of 750.64Fg−1 at 1.11Ag−1.•The nanocomposite displayed excellent cycling stability. This paper reports the facile synthesis of a novel architectural of NiS/PEDOT:PSS with DEG, where the complementary features of the three components (well-defined NiS black pepper like nanoparticles on nickel foam, an ultrathin layers of poly (3,4-ethylenedioxythiophene)/poly(styrenesulfonate) (PEDOT:PSS), and diethylene glycol (DEG)) are deposited sequentially to a single entity to fabricate a high-performance electrode for supercapacitor applications. Owing to the high electrical conductivity of the well-defined NiS nanoparticles, in which the conductivity, and good chemical and electrochemical stability is enhanced further by the PEDOT:PSS and DEG thin layers, the as-fabricated NiS/PEDOT:PSS with a DEG chrysanthemum petal-like nanostructure exhibits good rate capability, excellent cycling stability, and high specific capacitance. The PEDOT:PSS with DEG offers extra conductive paths for each layer on NiS, yielding a lower internal resistance and charge-transfer resistance than that of the NiS/PEDOT:PSS without DEG. As a result, the NiS/PEDOT:PSS with the DEG electrode shows a tremendous pseudocapacitance of 750.64Fg−1 at 1.11Ag−1, along with a high energy density of 24.52Whkg−1 at a power density of 138.88Wkg−1 and good cycling stability, suggesting that it is a promising candidate for energy storage. The unique performance of NiS/PEDOT:PSS with a DEG benefits from its unique chrysanthemum petal-like nanostructure, which could offer faster ion and electron transfer ability, greater reaction surface area and good structural stability.