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Synthesis of Hexagonal-Shaped SnO 2 Nanocrystals and SnO 2 @C Nanocomposites for Electrochemical Redox Supercapacitors

2008; American Chemical Society; Volume: 112; Issue: 6 Linguagem: Inglês

10.1021/jp076995q

1932-7455

R. Kalai Selvan, Ilana Perelshtein, Nina Perkas, Aharon Gedanken,

ZnO doping and properties

To realize a suitable supercapacitor nanomaterial, the recently developed technique of reaction under autogenic pressure at elevated temperature has been employed by us to synthesize SnO2 hexagonal nanocrystals and SnO2@C nanocomposites. The synthesis at different temperatures (viz. 500, 600, and 700 °C) yields three different composites. Characterization of these composites by various methods confirms the structural (XRD, Raman, FT-IR) and nanoparticulate (TEM, HRTEM) nature of the synthesized materials. TEM studies including HRTEM reveal that all the synthesized SnO2 and SnO2@C nanomaterials are highly crystalline with hexagonal shape. Cyclic voltammetric studies carried out to examine the capacitance of SnO2@C in 1 M H2SO4 show that the nanocomposite prepared at 700 °C has a maximum specific capacitance of 37.8 F/g at a scan rate of 5 mV/s.