دانلود مقاله با موضوع مواد کربن متخلخل سلسله مراتبی خود دوپ شده N، O برای عملکرد بالا ابرخازنها
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موضوع به انگلیسی:N, O self-doped hierarchical porous carbon materials for high-performance
super-capacitors
بخشی از متن:Biomass carbon materials have been widely used as electrode materials for super‐capacitors (SC) due to their
economic, environmental, and sustainable characteristics. In this work, we proposed that the Sapindus
Mukorossi Peel (SMP) was used as a precursor to prepare a Sapindus Mukorossi Peel‐based activated carbon
material (SMPC) through carbonization and KOH activation. The morphology and structure of SMPC were
characterized by various test methods. Cyclic voltammetry (CV), galvanostatic charge–discharge (GCD) and
electrochemical impedance spectroscopy (EIS) were used to characterize its electrochemical performance.
The results show that SMPC has suitable pore size distribution, a large number of heteroatom functional groups
and excellent electrical conductivity. In addition, the amount of activator also has an important influence on
the performance of SMPC. When the mass ratio of carbon material to KOH is 1:3, the prepared sample
SMPC‐3 has the largest specific surface area (SSA) was 1254.5 m2/g. Moreover, SMPC‐3 also has excellent electrochemical
properties, high specific capacitance (at 1 A/g, the specific capacitance can reach 314.5F/g), good
cycle stability (at 5 A/g, cyclic charge and discharge 5000 times, the specific capacitance is only lost by 4.2%.),
superior rate performance (when the current density is increased from 0.5 A/g to 10 A/g, the specific capacitance
retention rate is 80.4%). Assembling SMPC‐3 // SMPC‐3 into a symmetrical SC shows higher energy
density (at 0.1 A/g, the energy density is 6.68 Wh/Kg) and power density (at 5 A/g, the power density is
3250 W/Kg
