Halloysite nanotubes favored facile deposition of nickel disulfide on NiMn oxides nanosheets for high-performance energy storage. (20th May 2018)

• Record Type: Journal Article
• Authors: Li, Nana; Zhou, Jie; Yu, Jiangsheng; Liu, Yun; Tang, Jian; Tang, Weihua
• Is Part Of: Electrochimica acta. Volume 273(2018)
• Page Start: 349
• Page End: 357
• Publication Date: 2018-05-20
• Subjects: Nickel disulfide -- Nickel manganese oxide -- Halloysite nanotubes -- Battery-type supercapacitor; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2018.04.018
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: The exploitation of electrode materials is extremely important for electrochemical energy storage systems with high energy and power densities as well as long lifespan. Herein, a facile halloysite nanotubes (HNTs) assisting deposition method is developed to prepare nickel disulfide interconnected nanosheet arrays on nickel manganese oxides (Ni-Mn-O) as electrodes for battery-type supercapacitors, resulting in exceptional energy storage performance. Taking advantage of the unique tubular architecture of hollow HNTs, gradient deposition of NiS2 and Ni-Mn-O nanosheets on HNTs are realized with two-step in-situ hydrothermal reaction and sulfidation. HNTs not only favor the formation of NiS2 during sulfidation but also offer good porosity for electrochemical energy storage. In solution state, the hybrid electrode exhibits a high capacity (1144.7C g −1 at 1 A g −1 and 597.5C g −1 at 20 A g −1 ) with excellent cyclic stability (92.6% after 2000 cycles). Solid-state symmetric supercapacitors fabricated with NiS2 @Ni-Mn-O/HNT hybrid demonstrate outstanding electrochemical performance for portable energy storage application. Our symmetric supercapacitors show a highest energy density of 164.2 Wh kg −1 at a power density of 1.3 kW kg −1 . The energy density remains as high as 28 Wh kg −1 even at the highest power density of 15.1 kW kg −1 with good long-term cycling stability (90.5% after 2000 cycles). Graphical abstract: One dimensional hierarachical NiS 2 @Ni-Mn-O nanosheets/halloysite nanotubes was first developed as electrode materials for high-performance supercapacitor . With nanotubular HNT support, the electrode material delivers ultrahigh capacity (1144.7 C g -1 at a current density of 1 A g -1 ) along with good rate capability and excellent cycling lifespan (92.6% retention after 2000 cycles) in 2 M KOH aqueous electrolyte. The optimal solid-state symmetric device delivers a maximum energy density of 164.2 Wh kg -1 and a maximum power density of 15.1 kW kg -1 . Highlights: Tubular hierarchical core-sheath NiS2 @Ni-Mn-O is achieved through HNTs-assisted hydrothermal reaction and sulfidation. HNTs control the morphology of hybrids but also promote the charge and electrolyte transfer. NiS2 @Ni-Mn-O/HNT symmetric SCs exhibit a highest 164.2 Wh kg −1 energy density and 15.1 kW kg −1 power density.