Glucose-assisted synthesis of nickel-cobalt sulfide/carbon nanotube composites as efficient cathode materials for hybrid supercapacitors

Tsung-Wu Lin, Min-Chien Hsiao, Shu-Wei Chou, Hsin-Hui Shen, Jeng-Yu Lin

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36 Citations (Scopus)

Abstract

In this work, nickel and cobalt binary sulfide nanoparticles are successfully decorated on the surface of multi-walled carbon nanotubes to form a composite (Ni-CoS/MWCNT) via a facile glucose-assisted hydrothermal method. By introducing the conductive MWCNT and tuning the Ni/Co molar ratio for the Ni-CoS/MWCNT composites, the optimized one shows a high capacity up to 153 mAh g-1, superior rate capability and excellent electrochemical stability. On this basis, advanced hybrid supercapacitor (HSC) is assembled by using the Ni-CoS/MWCNT composite as the cathode and reduced graphene oxide as the anode. As-fabricated HCS is able to be operated reversibly in a full voltage region of 0?1.6 V and achieves a high specific capacity of 33 mAh g-1 at 1 A g-1, therefore delivering a maximum energy density of 23 Wh kg-1 at a power density of 684 W kg-1. Furthermore, the HSC still retains 90 of its initial discharge capacity after 2000-cycle consecutive charge/discharge test at 4 A g-1.
Original languageEnglish
Pages (from-to)1493 - 1499
Number of pages7
JournalJournal of the Electrochemical Society
Volume162
Issue number8
DOIs
Publication statusPublished - 2015

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