Mesoporous transition metal oxides quasi-nanospheres with enhanced electrochemical properties for supercapacitor applications

Lu Wang, Guorong Duan, Junwu Zhu, Shen Ming Chen, Xiao heng Liu, Selvakumar Palanisamy

    Research output: Contribution to journalArticlepeer-review

    32 Scopus citations

    Abstract

    In this report, we obtain mesoporous transition metal oxides quasi-nanospheres (includes MnO2, NiO, and Co3O4) by utilizing mesoporous silica nanospheres as a template for high-performance supercapacitor electrodes. All samples have a large specific surface area of approximately 254–325 m2 g−1 and a relatively narrow pore size distribution in the region of 7 nm. Utilization of a nanosized template resulted in a product with a relative uniform morphology and a small particle diameter in the region of 50–100 nm. As supercapacitor electrodes, MnO2, NiO, and Co3O4 exhibit an outstanding capacity as high as 838–1185 F g−1 at 0.5 A g−1 and a superior long-term stability with minimal loss of 3–7% after 6000 cycles at 1 A g−1. Their excellent electrochemical performances are attributed to favorable morphologies with a large surface area and a uniform architecture with abundant pores. The associated enhancement of electrolyte ion circulation within the electrode facilitates a significant increase in availability of Faradic reaction electroactive sites.

    Original languageBritish English
    Pages (from-to)73-83
    Number of pages11
    JournalJournal of Colloid and Interface Science
    Volume483
    DOIs
    StatePublished - 1 Dec 2016

    Keywords

    • CoO
    • Excellent supercapacitor performance
    • High surface area
    • Mesoporous structure
    • MnO
    • NiO
    • Quasi-nanospheres

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