Issue 23, 2016

Superior Na-ion storage properties of high aspect ratio SnSe nanoplates prepared by a spray pyrolysis process

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 °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.

Graphical abstract: Superior Na-ion storage properties of high aspect ratio SnSe nanoplates prepared by a spray pyrolysis process

Supplementary files

Article information

Article type
Paper
Submitted
12 Apr 2016
Accepted
30 Apr 2016
First published
12 May 2016

Nanoscale, 2016,8, 11889-11896

Superior Na-ion storage properties of high aspect ratio SnSe nanoplates prepared by a spray pyrolysis process

G. D. Park, J. Lee and Y. C. Kang, Nanoscale, 2016, 8, 11889 DOI: 10.1039/C6NR02983C

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