Abstract
Unique-structured composite microspheres of carbon and MoTe2 were prepared by a two-step process. Precursor C-MoOx composite microspheres were prepared by spray pyrolysis, and then the precursor was transformed into C-MoTe2 composite microspheres by a tellurization process. C-MoTe2 composites with a uniform distribution of MoTe2 nanocrystals (C/MoTe2) and core-shell-structured C-MoTe2 composites (C@MoTe2) were synthesized at tellurization temperatures of 450 and 600 °C, respectively. At a higher tellurization temperature of 600 °C, all of the MoTe2 nanocrystals moved to the surface of the microsphere because of the Ostwald ripening process. The initial discharge capacities of the C/MoTe2, C@MoTe2, and bare MoTe2 (i.e., containing no carbonaceous materials) powders for Na-ion storage at a current density of 1.0 A g-1 were 328, 388, and 341 mA h g-1, respectively. The discharge capacities of the C/MoTe2, C@MoTe2, and bare MoTe2 powders for the 200th cycle were 241, 286, and 104 mA h g-1, respectively, and the corresponding capacity retentions, which were measured from the second cycle were 100%, 99%, and 37%, respectively. The high structural stability and well-developed two-dimensional layer of MoTe2 of the C@MoTe2 microspheres provide superior Na-ion storage properties compared to those of the C/MoTe2 microspheres and bare MoTe2 powder.
| Original language | English |
|---|---|
| Pages (from-to) | 1942-1950 |
| Number of pages | 9 |
| Journal | Nanoscale |
| Volume | 9 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 2017 Feb 7 |
Fingerprint
ASJC Scopus subject areas
- Materials Science(all)
Cite this
Carbon/two-dimensional MoTe2 core/shell-structured microspheres as an anode material for Na-ion batteries. / Cho, Jung Sang; Ju, Hyeon Seok; Lee, Jung Kul; Kang, Yun Chan.
In: Nanoscale, Vol. 9, No. 5, 07.02.2017, p. 1942-1950.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Carbon/two-dimensional MoTe2 core/shell-structured microspheres as an anode material for Na-ion batteries
AU - Cho, Jung Sang
AU - Ju, Hyeon Seok
AU - Lee, Jung Kul
AU - Kang, Yun Chan
PY - 2017/2/7
Y1 - 2017/2/7
N2 - Unique-structured composite microspheres of carbon and MoTe2 were prepared by a two-step process. Precursor C-MoOx composite microspheres were prepared by spray pyrolysis, and then the precursor was transformed into C-MoTe2 composite microspheres by a tellurization process. C-MoTe2 composites with a uniform distribution of MoTe2 nanocrystals (C/MoTe2) and core-shell-structured C-MoTe2 composites (C@MoTe2) were synthesized at tellurization temperatures of 450 and 600 °C, respectively. At a higher tellurization temperature of 600 °C, all of the MoTe2 nanocrystals moved to the surface of the microsphere because of the Ostwald ripening process. The initial discharge capacities of the C/MoTe2, C@MoTe2, and bare MoTe2 (i.e., containing no carbonaceous materials) powders for Na-ion storage at a current density of 1.0 A g-1 were 328, 388, and 341 mA h g-1, respectively. The discharge capacities of the C/MoTe2, C@MoTe2, and bare MoTe2 powders for the 200th cycle were 241, 286, and 104 mA h g-1, respectively, and the corresponding capacity retentions, which were measured from the second cycle were 100%, 99%, and 37%, respectively. The high structural stability and well-developed two-dimensional layer of MoTe2 of the C@MoTe2 microspheres provide superior Na-ion storage properties compared to those of the C/MoTe2 microspheres and bare MoTe2 powder.
AB - Unique-structured composite microspheres of carbon and MoTe2 were prepared by a two-step process. Precursor C-MoOx composite microspheres were prepared by spray pyrolysis, and then the precursor was transformed into C-MoTe2 composite microspheres by a tellurization process. C-MoTe2 composites with a uniform distribution of MoTe2 nanocrystals (C/MoTe2) and core-shell-structured C-MoTe2 composites (C@MoTe2) were synthesized at tellurization temperatures of 450 and 600 °C, respectively. At a higher tellurization temperature of 600 °C, all of the MoTe2 nanocrystals moved to the surface of the microsphere because of the Ostwald ripening process. The initial discharge capacities of the C/MoTe2, C@MoTe2, and bare MoTe2 (i.e., containing no carbonaceous materials) powders for Na-ion storage at a current density of 1.0 A g-1 were 328, 388, and 341 mA h g-1, respectively. The discharge capacities of the C/MoTe2, C@MoTe2, and bare MoTe2 powders for the 200th cycle were 241, 286, and 104 mA h g-1, respectively, and the corresponding capacity retentions, which were measured from the second cycle were 100%, 99%, and 37%, respectively. The high structural stability and well-developed two-dimensional layer of MoTe2 of the C@MoTe2 microspheres provide superior Na-ion storage properties compared to those of the C/MoTe2 microspheres and bare MoTe2 powder.
UR - http://www.scopus.com/inward/record.url?scp=85011319781&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85011319781&partnerID=8YFLogxK
U2 - 10.1039/c6nr07158a
DO - 10.1039/c6nr07158a
M3 - Article
C2 - 28098302
AN - SCOPUS:85011319781
VL - 9
SP - 1942
EP - 1950
JO - Nanoscale
JF - Nanoscale
SN - 2040-3364
IS - 5
ER -