Advanced
carbon materials with high specific surface area (SSA),
porous structure, and good conductivity are the key factors to obtaining
efficient energy storage and conversion devices. Here, a simple gas-phase
cycle reaction was used to prepare a carbon material with 3D honeycomb
structure derived from seaweed powder. The as-obtained carbon material
(CS-2) exhibited excellent SSA (1206.97 m2 g–1) and good surface wetting properties. In particular, the CS-2 material
exhibits very high specific capacitance (448.3 F g–1) and stable cycle life (∼91.39% capacitance retention after
3000 cycles) due to the special porous structure on its surface. To
test the applicability of the material in practice, CS-2 was assembled
into a simple symmetrical supercapacitor (SC), which achieved a maximum
energy density of 3.125 W h kg–1. The above performance
analysis indicates that the carbon material based on seaweed powder
can be efficiently used as an electrode material for SCs.
Fly ash with a Si : Al ratio of 3.63 has been converted to a zeolite of high Cu2+ sorption capacity using a fusion conversion process and an improved hydrothermal method.
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