Fabrication of a 3D Hierarchical Sandwich Co9S8/α‐MnS@N–C@MoS2 Nanowire Architectures as Advanced Electrode Material for High Performance Hybrid Supercapacitors. Issue 23 (10th May 2018)

• Record Type: Journal Article
• Authors: Kandula, Syam; Shrestha, Khem Raj; Kim, Nam Hoon; Lee, Joong Hee
• Is Part Of: Small. Volume 14:Issue 23(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-05-10
• Subjects: energy density -- hierarchical architectures -- hybrid supercapacitors -- metal sulphides -- N‐doped carbon; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.201800291
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: Supercapacitors suffer from lack of energy density and impulse the energy density limit, so a new class of hybrid electrode materials with promising architectures is strongly desirable. Here, the rational design of a 3D hierarchical sandwich Co9 S8 /α‐MnS@N–C@MoS2 nanowire architecture is achieved during the hydrothermal sulphurization reaction by the conversion of binary mesoporous metal oxide core to corresponding individual metal sulphides core along with the formation of outer metal sulphide shell at the same time. Benefiting from the 3D hierarchical sandwich architecture, Co9 S8 /α‐MnS@N–C@MoS2 electrode exhibits enhanced electrochemical performance with high specific capacity/capacitance of 306 mA h g −1 /1938 F g −1 at 1 A g −1, and excellent cycling stability with a specific capacity retention of 86.9% after 10 000 cycles at 10 A g −1 . Moreover, the fabricated asymmetric supercapacitor device using Co9 S8 /α‐MnS@N–C@MoS2 as the positive electrode and nitrogen doped graphene as the negative electrode demonstrates high energy density of 64.2 Wh kg −1 at 729.2 W kg −1, and a promising energy density of 23.5 Wh kg −1 is still attained at a high power density of 11 300 W kg −1 . The hybrid electrode with 3D hierarchical sandwich architecture promotes enhanced energy density with excellent cyclic stability for energy storage. Abstract : High performance hybrid supercapacitors are fabricated with nitrogen doped carbon sandwiched between the Co9 S8 /α‐MnS core and the MoS2 outer‐shell as cathode and nitrogen doped graphene as anode. Owing to the state‐of‐the‐art, 3D hierarchical sandwich architectures, the Co9 S8 /α‐MnS@N–C@MoS2 //NG hybrid supercapacitor exhibits high specific capacity/capacitance and excellent cyclic stability. Moreover, the hybrid supercapacitor delivers better energy density than recently reported metal sulphide based electrodes.