In situ encapsulation of tin oxide and cobalt oxide composite in porous carbon for high-performance energy storage applications

• Main Authors: Pal, Bhupender, Krishnan, Syam G., Vijayan, Bincy Lathakumary, Harilal, Midhun, Yang, Chun-Chen, Ezema, Fabian I., M. M., Yusoff, Rajan, Jose
• Format: Article
• Language: English
• Published: Elsevier B.V. 2018
• Subjects: Q Science (General)
• Online Access: http://umpir.ump.edu.my/id/eprint/23045/1/In%20situ%20encapsulation%20of%20tin%20oxide%20and%20cobalt%20oxide%20composite%20in%20porous%20carbon.pdf; http://umpir.ump.edu.my/id/eprint/23045/; https://www.sciencedirect.com/science/article/pii/S157266571830273X; https://doi.org/10.1016/j.jelechem.2018.04.019

Herein, we report the preparation of porous carbon from palm kernel shell and loading of tin oxide‑cobalt oxide in its pores using a facile in-situ encapsulation synthesis strategy. The as-synthesized SnO2/Co3O4@C composite was characterized by powder X-ray diffraction, X-ray photoelectron spectroscopy and field-emission scanning electron microscopy techniques. This composite was used as an electrode for supercapacitors. Electrochemical charge storage capabilities of the composite were measured using cyclic voltammetry, charge-discharge cycling and electrochemical impedance spectroscopy in aqueous 6 M KOH and 1 M Na2SO4 electrolytes. The SnO2/Co3O4@C composite showed over 70% higher specific capacitance (177 F g−1) than the pure porous carbon (106 F g−1) in 6 M KOH. Among these electrolytes, the composite exhibited an enhanced electrochemical performance in KOH electrolyte due to its smaller hydrated ion radius, high ionic mobility and lower equivalent series resistance than Na2SO4.