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 |
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Keywords
- cobalt oxide
- cobalt selenide
- energy storage
- Na-ion battery
- nanostructure
ASJC Scopus subject areas
- Materials Science(all)
Cite this
Hollow Cobalt Selenide Microspheres : Synthesis and Application as Anode Materials for Na-Ion Batteries. / Ko, You Na; Choi, Seung Ho; Kang, Yun Chan.
In: ACS Applied Materials and Interfaces, Vol. 8, No. 10, 16.03.2016, p. 6449-6456.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Hollow Cobalt Selenide Microspheres
T2 - Synthesis and Application as Anode Materials for Na-Ion Batteries
AU - Ko, You Na
AU - Choi, Seung Ho
AU - Kang, Yun Chan
PY - 2016/3/16
Y1 - 2016/3/16
N2 - 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.
AB - 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.
KW - cobalt oxide
KW - cobalt selenide
KW - energy storage
KW - Na-ion battery
KW - nanostructure
UR - http://www.scopus.com/inward/record.url?scp=84962312080&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84962312080&partnerID=8YFLogxK
U2 - 10.1021/acsami.5b11963
DO - 10.1021/acsami.5b11963
M3 - Article
VL - 8
SP - 6449
EP - 6456
JO - ACS applied materials & interfaces
JF - ACS applied materials & interfaces
SN - 1944-8244
IS - 10
ER -