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 language | English |
|---|---|
| Pages (from-to) | 6449-6456 |
| Number of pages | 8 |
| Journal | ACS Applied Materials and Interfaces |
| Volume | 8 |
| Issue number | 10 |
| DOIs | |
| Publication status | Published - 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