Graphitization and Raman Measurement Quiz

3.06 wt%

1997.5 m2 g$^{-1}$

312 F g$^{-1}$

1:1

To form sheet-like precursors and introduce nitrogen element.

They are further carbonized to form NCS.

Several 10 nm.

1997.5 m2 g^-1.

density functional theory (DFT) method

FEI Tecnai G2 20 transmission electron microscope (TEM)

E = \frac{1},{2}CV^2

P = Et

312 F g^{-1}

246 F g^{-1}

91.3%

20.2 Wh kg^{-1}

The purpose of the study is to synthesize N-doped activated carbon sheets for supercapacitor application.

The N-doped activated carbon sheets are synthesized using glucose as a carbon source via melamine-assisted chemical blowing and sequent KOH-activation method.

The obtained carbon material possesses a sheet-like morphology with ultrathin thickness, hierarchical micro/mesoporous structure, high specific surface area (up to 1997.5 m^2 g^-1), and high pore volume (0.94 cm^3 g^-1).

The nitrogen content of the NACS material is 3.

The characteristic peak observed in the Raman spectra is at approximately 1356 cm^{-1}, corresponding to the D-band.

The peak at about 1596 cm^{-1} in the Raman spectra indicates the presence of the G-band, which denotes the ordered graphite lattice of carbon material.

The calculated intensity ratio of D and G bands (ID/IG) is 0.92, indicating a low crystallinity of the obtained NACS.

The four different types of nitrogen functionalities observed in the high resolution N1s spectrum of NACS are pyridinic-N (N6) at 398.3 eV, pyrrolic-N (N-5) at 400.2 eV, quaternary-N (N-Q) at 401.4 eV, and pyridine-N-oxide (N-X) at 403.0 eV.

312 F g^-1

246 F g^-1

1. The sheet-like morphology provides a large exposed area to electrolytes and a short diffusion distance for electrolyte ions into the inner pore walls. 2) Hierarchical micro/mesoporous structure with high specific surface area, microporous volume and uniform pore size distribution could accelerate ion transport process within the pore channels and provide abundant inner surface regions for ion accumulation. 3) Doping nitrogen groups don't only increase the surface wetting characters, but also improve the conductivity of carbon materials and introduce extra pseudocapacitance, thus further enhancing the capacity performance.

The specific capacitances of NACS at any current densities are much higher than those of AC and NCS materials.

The high specific capacitance and excellent rate performance of NACS demonstrate its ability to maintain a high capacitance even at high current densities.

The effect of the chemical blowing agent percentage on the ele is not mentioned in the given text.