Hollow Cobalt Selenide Microspheres: Synthesis and Application as Anode Materials for Na-Ion Batteries

You Na Ko, Seung Ho Choi, Yun Chan Kang

    Research output: Contribution to journalArticlepeer-review

    131 Citations (Scopus)

    Abstract

    The electrochemical properties of hollow cobalt oxide and cobalt selenide microspheres are studied for the first time as anode materials for Na-ion batteries. Hollow cobalt oxide microspheres prepared by one-pot spray pyrolysis are transformed into hollow cobalt selenide microspheres by a simple selenization process using hydrogen selenide gas. Ultrafine nanocrystals of Co3O4 microspheres are preserved in the cobalt selenide microspheres selenized at 300 °C. The initial discharge capacities for the Co3O4 and cobalt selenide microspheres selenized at 300 and 400 °C are 727, 595, and 586 mA h g-1, respectively, at a current density of 500 mA g-1. The discharge capacities after 40 cycles for the same samples are 348, 467, and 251 mA h g-1, respectively, and their capacity retentions measured from the second cycle onward are 66, 91, and 50%, respectively. The hollow cobalt selenide microspheres have better rate performances than the hollow cobalt oxide microspheres.

    Original languageEnglish
    Pages (from-to)6449-6456
    Number of pages8
    JournalACS Applied Materials and Interfaces
    Volume8
    Issue number10
    DOIs
    Publication statusPublished - 2016 Mar 16

    Bibliographical note

    Funding Information:
    This work was supported by the Energy Efficiency & Resources Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea (201320200000420). This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (NRF- 2015R1A2A1A15056049).

    Publisher Copyright:
    © 2016 American Chemical Society.

    Keywords

    • Na-ion battery
    • cobalt oxide
    • cobalt selenide
    • energy storage
    • nanostructure

    ASJC Scopus subject areas

    • General Materials Science

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