Graphitization and Raman Measurement Quiz

3.06 wt%

1997.5 m2 g$^{-1}$

312 F g$^{-1}$

<p>1:1</p> Signup and view all the answers

<p>To form sheet-like precursors and introduce nitrogen element.</p> Signup and view all the answers

<p>They are further carbonized to form NCS.</p> Signup and view all the answers

<p>Several 10 nm.</p> Signup and view all the answers

<p>1997.5 m2 g^-1.</p> Signup and view all the answers

<p>density functional theory (DFT) method</p> Signup and view all the answers

<p>FEI Tecnai G2 20 transmission electron microscope (TEM)</p> Signup and view all the answers

<p>E = \frac{1},{2}CV^2</p> Signup and view all the answers

<p>P = Et</p> Signup and view all the answers

<p>312 F g^{-1}</p> Signup and view all the answers

<p>246 F g^{-1}</p> Signup and view all the answers

<p>91.3%</p> Signup and view all the answers

<p>20.2 Wh kg^{-1}</p> Signup and view all the answers

<p>The purpose of the study is to synthesize N-doped activated carbon sheets for supercapacitor application.</p> Signup and view all the answers

<p>The N-doped activated carbon sheets are synthesized using glucose as a carbon source via melamine-assisted chemical blowing and sequent KOH-activation method.</p> Signup and view all the answers

<p>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).</p> Signup and view all the answers

<p>The nitrogen content of the NACS material is 3.</p> Signup and view all the answers

<p>The characteristic peak observed in the Raman spectra is at approximately 1356 cm^{-1}, corresponding to the D-band.</p> Signup and view all the answers

<p>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.</p> Signup and view all the answers

<p>The calculated intensity ratio of D and G bands (ID/IG) is 0.92, indicating a low crystallinity of the obtained NACS.</p> Signup and view all the answers

<p>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.</p> Signup and view all the answers

<p>312 F g^-1</p> Signup and view all the answers

<p>246 F g^-1</p> Signup and view all the answers

<ol> <li>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.</li> </ol> Signup and view all the answers

<p>The specific capacitances of NACS at any current densities are much higher than those of AC and NCS materials.</p> Signup and view all the answers

<p>The high specific capacitance and excellent rate performance of NACS demonstrate its ability to maintain a high capacitance even at high current densities.</p> Signup and view all the answers

<p>The effect of the chemical blowing agent percentage on the ele is not mentioned in the given text.</p> Signup and view all the answers