• DOI:10.1039/c5cp01728a
• Corpus ID: 21029445

Effects of different electrolytes on the electrochemical and dynamic behavior of electric double layer capacitors based on a porous silicon carbide electrode.

@article{Kim2015EffectsOD,
  title={Effects of different electrolytes on the electrochemical and dynamic behavior of electric double layer capacitors based on a porous silicon carbide electrode.},
  author={Myeongjin Kim and Ilgeun Oh and Jooheon Kim},
  journal={Physical chemistry chemical physics : PCCP},
  year={2015},
  volume={17 25},
  pages={
          16367-74
        }
}

• Myeongjin Kim, Ilgeun Oh, Jooheon Kim
• Published 17 June 2015
• Materials Science
• Physical chemistry chemical physics : PCCP

Controlling the structure and morphology of porous electrode materials is an effective strategy for realizing a high surface area and efficient paths for ion diffusion. Moreover, excellent electrical conductivity can significantly decrease the internal resistance of an electrode by the formation of a conductive network and facilitate the application of electrostatic charges, which favors the accumulation of an electrical double layer. In light of these facts, we demonstrate the fabrication of β-polytype porous silicon carbide spheres (PSiCS) with a hierarchical pore structure in which micro- and mesopores are interconnected with a mesoporous network. Further, to investigate the effects of the electrolyte on the electrochemical and dynamic behavior, two-electrode symmetrical supercapacitors based on the PSiCS electrode with an aqueous electrolyte (1 M potassium chloride, KCl) or an organic electrolyte (1 M tetraethylammonium tetrafluoroborate in acetonitrile, TEABF4/AN) were assembled. The symmetrical supercapacitor based on the PSiCS electrode with the aqueous electrolyte exhibited a high charge-storage capacity with a specific capacitance of 82.9 F g(-1) at a scan rate of 5 mV s(-1), which is much higher than that obtained using the organic electrolyte (60.3 F g(-1) at a scan rate of 5 mV s(-1)). However, the energy density of the organic electrolyte system was 102.59 W h kg(-1) at a scan rate of 5 mV s(-1), which is greatly superior to that of the aqueous electrolyte system (energy density: 29.47 W h kg(-1)) owing to the wide cell operating voltage range.