Growth-controlled NiCo<inf>2</inf>S<inf>4</inf> nanosheet arrays with self-decorated nanoneedles for high-performance pseudocapacitors

Liyang Lin, Jianlin Liu, Tianmo Liu, Jinghua Hao, Kemeng Ji, Rong Sun, Wen Zeng, Zhongchang Wang

    Research output: Contribution to journalArticlepeer-review

    78 Citations (Scopus)

    Abstract

    We report a synthesis of NiCo<inf>2</inf>S<inf>4</inf> nanosheet arrays with self-decorated nanoneedles on nickel foams by a facile and efficient two-step hydrothermal approach. We demonstrate that the morphologies of various three-dimensional nanostructures such as nanoneedle arrays, nanosheet arrays, and nanoneedle-decorated nanosheet arrays can be manipulated by tuning the amount of additive ammonium fluoride alone in the reaction. The unusual nanostructure of nanoneedles grown on the surface of NiCo<inf>2</inf>S<inf>4</inf> nanosheet arrays shows a large electroactive surface area and superior electrochemical properties. The electrode made of the NiCo<inf>2</inf>S<inf>4</inf> nanosheet arrays with self-decorated nanoneedles shows greatly improved electrochemical performances with an ultrahigh specific capacitance of 2617.6 F g<sup>-1</sup> at a current density of 15 mA cm<sup>-2</sup> and of 2051.0 F g<sup>-1</sup> even at a current density of 30 mA cm<sup>-2</sup>. The electrode also exhibits an excellent cycling stability by retaining 93.2% of its original state after 5000 cycles, rendering the NiCo<inf>2</inf>S<inf>4</inf> nanosheet arrays with self-decorated nanoneedles a potential electrode material for high-performance supercapacitors.

    Original languageEnglish
    Pages (from-to)17652-17658
    Number of pages7
    JournalJournal of Materials Chemistry A
    Volume3
    Issue number34
    DOIs
    Publication statusPublished - 2015 Jul 17

    ASJC Scopus subject areas

    • Chemistry(all)
    • Renewable Energy, Sustainability and the Environment
    • Materials Science(all)

    Fingerprint Dive into the research topics of 'Growth-controlled NiCo<inf>2</inf>S<inf>4</inf> nanosheet arrays with self-decorated nanoneedles for high-performance pseudocapacitors'. Together they form a unique fingerprint.

    Cite this