Hierarchical porous carbon obtained from directly carbonizing carex meyeriana for high-performance supercapacitors

Abstract

Hierarchical porous carbon materials with high surface area are facilely prepared by directly carbonizing carex meyeriana without any extra activation procedure. The as-prepared porous carbon samples possess high Brunauer-Emmett-Teller (BET) surface areas (in the * 518-742 m 2 g -1 range) and unique hierarchical porous structure containing macropore channels and mesopores and micropores developed in the wall of macropores. These intriguing characteristics make the as-prepared hierarchical porous carbon samples a promising electrode material for supercapacitors. The capacitive performance was measured in the three-electrode system with 6 M KOH electrolyte. The hierarchical porous carbon prepared at the carbonization temperature of 1000 °C presents a high specific capacitance of 178.6 F g -1 at a current density of 0.5 A g -1 , a good rate performance ( about 65.2% retention ratio at the current density of 20 A g -1 ), and an excellent cycling stability (no obvious performance fading after 10,000 cycles). In addition, the fabricated two-electrode device achieves an energy density of 4.33 Wh kg -1 at a high power density of 5 kW kg -1 . These results provide a green and facile method to synthesize the electrode material from biomass for high-performance supercapacitors.

Chitosan-Based Synthesis of O, N, and P Codoped Hierarchical Porous Carbon as Electrode Materials for Supercapacitors

“…Meanwhile, the doped O, N, and P enable an enhanced electron-donating capacity of the carbon skeleton and improve the electrochemical performance by providing pseudocapacitance. As shown in Table , ONPC-700 is comparable to some other porous carbons when it is used as electrodes for supercapacitors. ,− …”

Electrospun Fabric Tin Oxide 1‐D Nanofibers: Approach Towards Flexible Electrode for Supercapacitor Application

“…transition metal oxides and conducting polymers rely on reversible faradic reaction associated at electrode/electrolyte surface, which is expected to provide higher electrochemical performance than EDLCs. [11,12] As a result of poor stability and relatively lower capacitance of conducting polymer materials, [13] most researchers have been extensively investigating the variety of oxide-based nanomaterials like RuO 2 , NiO 2 , Co 3 O 4 , and MnO 2 [14][15][16][17] in many emerging applications owing to engrossing chemical and electrical properties, especially for energy storage devices. Ruthenium oxide, demonstrated as an earlier material to exhibit excellent electrochemical performance.…”

Fabrication of N-Doped Porous Carbon with Micro/Mesoporous Structure from Furfural Residue for Supercapacitors

“…For electrode materials, the hierarchical pore structure of PCs would be extremely important. Micropores can provide high specific capacitance, while the presence of mesopores and macropores is conducive to achieving high power density [5,6]. Wu et al [7] employed Chinese fir and open-heart fruit shells as raw materials to prepare four types of PCs with similar SSA using steam activation or KOH activation methods to study the influence of pore size on electrochemical performance.…”