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A Hybrid Redox-Supercapacitor System with Anionic Catholyte and Cationic Anolyte

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Abstract
  • A significant challenge for energy storage technologies is to realize battery-level energy density and capacitor-level durability and power density in one device. By introducing an electrolyte composed of an anionic catholyte and a cationic anolyte into a symmetric carbon-based supercapacitor configuration, a hybrid electrochemical battery-supercapacitor system using soluble redox species delivers significantly improved energy density from 20 to 42 W•h/kg (based on the electrode mass) and stable capacities for > 10⁴ cycles. The ionic species formed in the electrolyte are studied by UV-Vis, Raman and mass spectroscopy to probe the energy storage mechanism. The strategy is general and may provide a route to critically-needed fast-charging devices with both high energy density and power.
  • Keywords: Electrochemical capacitors, Energy storage
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  • Wang, B., Maciá-Agulló, J. A., Prendiville, D. G., Zheng, X., Liu, D., Zhang, Y., ... & Stucky, G. D. (2014). A Hybrid Redox-Supercapacitor System with Anionic Catholyte and Cationic Anolyte. Journal of the Electrochemical Society, 161(6), A1090-A1093. doi:10.1149/2.058406jes
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  • 161
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  • 6
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  • This work was supported by Advanced Research Project Agency-E (ARPA-E), Department of Energy (DOE) of the United States (Award No. DE-AR0000344). The MRL Shared Experimental Facilities are supported by the MRSEC Program of the NSF under award No. DMR 1121053; a member of the NSF-funded Materials Research Facilities Network (www.mrfn.org). We thank Prof. Michael T. Bowers for assistance with the MS analysis that is supported by NSF (CHE-0909743) and Waters Corp. for the donation of T-waveQ-TOF instrument; Dr. Christine Pastorek for UV-Vis measurements; Dr. May Nyman, Dr. Yu Hou, and Dr. Zuolei Liao for Raman analysis; and Dr. David Auston for his assistance in directing this research inclose accordance with ARPA-e guidelines and the Materials Genome Initiative.
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