Abstract
We report here on a hollow-fiber hierarchical porous carbon exhibiting an ultra-high specific surface area, synthesized by a facile method of carbonization and activation, using the Metaplexis Japonica (MJ) shell. The Metaplexis Japonica-based activated carbon demonstrated a very high specific surface area of 3635 m2 g−1. Correspondingly, the derived carbonaceous material delivers an ultra-high capacitance and superb cycle life in an alkaline electrolyte. The pore-ion size compatibility is optimized using tailored hierarchical porous carbon and different ion sized organic electrolytes. In ionic liquids nonaqueous based electrolytes we tailored the MJ carbon pore structure to the electrolyte ion size. The corresponding supercapacitor shows a superior rate performance and low impedance, and the device records specific energy and specific power densities as high as 76 Wh kg−1 and 6521 W kg−1, as well as a pronounced cycling durability in the ionic liquid electrolytes. Overall, we suggest a protocol for promising carbonaceous electrode materials enabling superior supercapacitors performance.
Highlights
Energy storage devices with high energy density and high-power density play an essential role in the rapidly growing power market [1,2,3,4,5]
After the sample way of annealing and activating, we obtained a hollow fiber with different pore structures
To further improve the energy density of the EDLC device, we studied the behavior of the Metaplexis Japonica (MJ)−5 electrode using an ionic liquid electrolyte (1 M EMIBF4 in ACN) by a series of electrochemistry characterization
Summary
Energy storage devices with high energy density and high-power density play an essential role in the rapidly growing power market [1,2,3,4,5]. Next-generation supercapacitors critically rely on advanced renewable, low-cost, eco-friendly electrode materials, possessing high adsorption, rapid ion/electron transport, and tunable surface chemistry [8,9]. Nanomaterials 2022, 12, 27 especially sizeable ions in the organic electrolyte and ionic liquids, leading to a low power and energy density at high operation current density. Tour’s group proposed a facile and cost-effective approach to electrodes made from nitrogen-doped carbonized cotton used in flexible supercapacitor [26] This strategy increased the wettability and additional faradaic pseudo-capacitance of the electrode material. The best performing MJ-5 electrode using an ionic liquid reaches the highest energy density This porous carbon has a hollow fiber channel structure hosting both microporous and mesoporous structures. 423 F g−1 at 5 mA cm−2 in 6 M KOH electrolyte, excellent kinetic behavior in the organic electrolyte, the high energy density of 76 Wh kg−1 , and power density of 6521 W kg−1 under a working voltage of 3.5 V in ionic liquid electrolyte
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