Superior Na-ion storage properties of high aspect ratio SnSe nanoplates prepared by a spray pyrolysis process
- Authors
- Park, Gi Dae; Lee, Jong-Heun; Kang, Yun Chan
- Issue Date
- 2016
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- NANOSCALE, v.8, no.23, pp.11889 - 11896
- Indexed
- SCIE
SCOPUS
- Journal Title
- NANOSCALE
- Volume
- 8
- Number
- 23
- Start Page
- 11889
- End Page
- 11896
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/90120
- DOI
- 10.1039/c6nr02983c
- ISSN
- 2040-3364
- Abstract
- SnSe nanoplates with thin and uniform morphology are prepared by one-pot spray pyrolysis, and are examined as anode materials for Na-ion batteries. During the spray pyrolysis process, metallic Se and Sn are prepared from SeO2 and SnO2, respectively, under a reducing atmosphere. Metallic Sn and metalloid Se, with melting points of 232 and 221 degrees C, respectively, form a melted Sn-Se mixture, which reacts exothermally to form SnSe nanocrystals. Several of these nanocrystals are grown simultaneously forming a micron-sized powder. Complete elimination of the excess amount of metalloid Se, by forming H2Se gas, results in aggregation-free SnSe nanoplates. The aspect ratio of these nanoplates is as high as 11.3. The discharge capacities for the SnSe nanoplates, prepared from spray solutions containing 100, 400, and 800% of the stoichiometric SeO2 content needed to form SnSe, are 407, 558, and 211 mA h g(-1), respectively, after 50 cycles at a constant current density of 0.3 A g(-1); their capacity retentions calculated from the second cycle onwards are 77, 100, and 60%, respectively. The phase pure SnSe nanoplates with a high aspect ratio show good cycling and rate performances for Na-ion storage.
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