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. 2016 Feb 26;6:22194. doi: 10.1038/srep22194

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Copyright © 2016, Macmillan Publishers Limited

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(A) Charge discharge profiles of a symmetrical C-RPG || C-RPG hybrid capacitor cycled at a rate of ~1C (corresponding to a current density of 60 mA/g _electrode). (B) Capacity retention and Coulombic efficiency at a C-rate of 100. The first cycle efficiency is close to 90% with 75% of the capacity being subsequently retained after 40,000 cycles. (C) Terminal insensitive cell test. After inverting the polarization at the terminals, a similar response is obtained. (D) Discharge profiles of C-RPG || C_xLi Li-ion capacitor at various C-rates. (E) Ragone plot for the prototype hybrid supercapacitors. Specific energy and power are also estimated considering only 50 and 25 wt.% active components content. For comparison, performance metrics for established energy storage devices are highlighted. Adapted from³⁶.