3 years ago

Synergistic effect of ionic liquid intercalation and multiwalled carbon nanotube spacers with improved supercapacitor performance

Synergistic effect of ionic liquid intercalation and multiwalled carbon nanotube spacers with improved supercapacitor performance
The restacking of reduced graphene oxide (RGO) with undesirable energy density and power density is still a thorny issue. In our work, we proposed a simple strategy from incorporating ionic liquid (IL) and multiwalled carbon nanotubes (MWCNTs) in turn to impede the RGO sheets aggragation. With synergistic effect of IL ions intercalation and MWCNTs spacers, a uniformly dispersed hierarchical pore structure was obtained. For RGO-IL-MWCNTs, a very high specific surface area (588.7 m2 g−1) with enhanced fraction of mesopores and macropores can provide more accessible areas and pathways for charge accommodation and IL diffusion. This optimized hierarchical pore structure possesses a high specific capacity of 269.3 F g−1 (at 2 mV s−1) and a very high energy density of 131.8 Wh kg−1 (at a power density of 892.6 W kg−1) in pure IL electrolyte at room temperature. Interestingly, this simple method probably offers excellent potential for large-scale production of dispersed two-dimensional layered materials with superior performance.

Publisher URL: www.sciencedirect.com/science

DOI: S0378775317309473

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