Jump to main content
Jump to site search


Highly Stable Supercapacitors with MOF-derived Co9S8/Carbon Electrodes for High Rate Electrochemical Energy Storage

Abstract

Co9S8 has received intensive attention as electrode material for electrical energy storage (EES) systems due to its unique structural features and rich electrochemical properties. However, the instability and inferior rate capability of Co9S8 electrode material during charge/discharge process has restricted its applications in supercapacitors (SCs). Here, MOF-derived Co9S8 nanoparticles (NPs) embedded in carbon co-doped with N and S (Co9S8/NS-C) was synthesized as a high rate capability and super stable electrode material for SCs. The Co9S8/NS-C was characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (HRTEM). It was found that the Co9S8/NS-C material possessed a unique nanostructure in which Co9S8 NPs were encapsulated in porous graphitic carbon co-doped with N and S. The Co9S8/NS-C and porous graphitic carbon composite led to improved rate performance by enhancing the stability of the electrode material and shortening the ion diffusion paths due to a synergistic effect. The as-prepared Co9S8/NS-C-1.5 h material exhibited a high specific capacitance of 734 F g-1 at a current density of 1 A g-1, excellent rate capability (653 F g-1 at 10 A g-1) and super cycling stability, i.e., capacitance retention of about 99.8% after 140,000 cycles at a current density of 10 A g-1. Thus, a new approach to fabricate promising electrode materials for high-performance SCs is presented here.

Back to tab navigation
Please wait while Download options loads

Supplementary files

Publication details

The article was received on 08 Apr 2017, accepted on 12 May 2017 and first published on 12 May 2017


Article type: Paper
DOI: 10.1039/C7TA03070C
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
  •   Request permissions

    Highly Stable Supercapacitors with MOF-derived Co9S8/Carbon Electrodes for High Rate Electrochemical Energy Storage

    S. Zhang, D. Li, S. Chen, X. Yang, X. Zhao, Q. Zhao, S. Komarneni and D. Yang, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA03070C

Search articles by author