Fatsia Japonica-Derived Hierarchical Porous Carbon for Supercapacitors With High Energy Density and Long Cycle Life

Abstract

Fatsia Japonica seed, which is mainly composed of glucose, has potential as a porous carbon matrix precursor for supercapacitors that can achieve high-value utilization. Cost-effective hierarchical porous carbon materials (HPC) were prepared from Fatsia Japonica by annealing at high temperature. The pore size and distribution of the HPC can be precisely controlled and adjusted by altering the activation temperature. The HPC obtained at 600 • C showed favorable features for electrochemical energy storage, with a surface area of 870.3 m 2 /g. The HPC for supercapacitors (a three-electrode system) exhibited good specific capacitance of 140 F/g at a current density of 1 A/g and a long cycling life stability (87.5% remained after 10,000 cycles). In addition, the HPC electrode showed an excellent energy density of 23 Wh/Kg. Such hierarchical porous biomass-derived carbon would be a good candidate for application in the electrodes of supercapacitors due to its simple preparation process and the outstanding electrochemical performance.

Recycling expired pharmaceutical drugs as redox materials for efficient and sustainable flexible supercapacitors

“…to form compounds for SC applications. These last materials are typically carbonized at 400-600 1C during 3-5 h. Some materials found are (see the summary in the Table 1) activated carbon from expired paracetamol tablets coated over a Ni foil (480 F g À1 , 28.3 W h kg À1 ), 24 hierarchical porous carbon from annealed Fatsia Japonica seeds (140 F g À1 , 23 W h kg À1 ), 65 porous carbon loaded with nitrogen molecules synthesized from licorice roots (221 F g À1 , 11.7 W h kg À1 ), 66 graphene sheets loaded with Emodin molecules (88 F g À1 , 32.8 W h kg À1 ) 67 and hierarchical porous carbon obtained from the carbonization of the Artemisia argyi rod plant (41 F g À1 , 32.06 W h kg À1 ). 68 Again, all these values of capacitance and energy density are inferior in comparison with those obtained for the SC-IBU device.…”

Hydrogen storage characteristics of bio‐based porous carbons of different origin: A comparative review

“…They are of great importance due to their applications as industrial adsorbents in air and water purification, adsorption of pollutants, gas separation, as components of templates and electrode materials, catalyst supports, chromatography columns, gas capture, and storage. 32,33,34,35,36,37,38,39,40,41,42,43,44 Nonetheless, they might be produced using expensive fossil-fuel precursors that might be environmentally dangerous. 8,12 In the adsorption of large hydrophobic molecules, the presence of mesopores or macropores would rather be preferred.…”

“…Porous carbons have attracted interest due to their high specific surface area and pore volume; tunable porosity; high electrical conductivity; good chemical, thermal, and mechanical stability; low density, hydrophobic nature of their surfaces, chemical inertness, easy handling, and low cost. They are of great importance due to their applications as industrial adsorbents in air and water purification, adsorption of pollutants, gas separation, as components of templates and electrode materials, catalyst supports, chromatography columns, gas capture, and storage 32,33,34,35,36,37,38,39,40,41,42,43,44 . Nonetheless, they might be produced using expensive fossil‐fuel precursors that might be environmentally dangerous 8,12 .…”

Progress in the use of organic potassium salts for the synthesis of porous carbon nanomaterials: microstructure engineering for advanced supercapacitors

“…11–13 PCNs can be obtained by the pyrolysis of various carbon precursors with templates and/or activation agents. 14–23 PCNs prepared by a template-assisted process usually exhibit a meso-/macro-pore dominated architecture with a relatively low SSA (<500 m 2 g −1 ) and small C sp (<200 F g −1 ), 24–26 while PCNs prepared by an activation agent based synthesis usually exhibit micropore-dominated porosity with quite a high SSA (>1000 m 2 g −1 ) and much larger C sp (>300 F g −1 ). 16,27,28 Therefore, activation is considered to be an effective approach for enhancing the capacitance performance of PCNs, and various activation agents have been explored.…”